71024S Search Results

71024S Result Highlights (5)

Part	Manufacturer	Description
71024S12TYG	Renesas Electronics Corporation	5.0V 128K x 8 Asynchronous Static RAM with Corner Power & Ground Pinout
71024S15TYGI	Renesas Electronics Corporation	5.0V 128K x 8 Asynchronous Static RAM with Corner Power & Ground Pinout
71024S20TYGI8	Renesas Electronics Corporation	5.0V 128K x 8 Asynchronous Static RAM with Corner Power & Ground Pinout
71024S25YG8	Renesas Electronics Corporation	5.0V 128K x 8 Asynchronous Static RAM with Corner Power & Ground Pinout
71024S12YGI8	Renesas Electronics Corporation	5.0V 128K x 8 Asynchronous Static RAM with Corner Power & Ground Pinout

71024S Price and Stock

Filter by Manufacturer


Renesas Electronics Corporation 71024S15TYGI8 IC SRAM 1MBIT PARALLEL 32SOJ
Distributors	Part	Package	Stock	Lead Time	Min Order Qty	Price	Buy
DigiKey	71024S15TYGI8	Reel	500		1,000	1 - 10 - 100 - 1000 $2.1875 10000 $2.1875	Buy Now
Avnet Americas	71024S15TYGI8	Reel		18 Weeks	1,000	1 $2.75 10 $2.75 100 $2.75 1000 $2.75 10000 $2.75	Buy Now
Mouser Electronics	71024S15TYGI8		1,594			1 $3.71 10 $3.71 100 $3.71 1000 $2.18 10000 $2.18	Buy Now
Newark	71024S15TYGI8	Cut Tape	856		1	1 $3.9 10 $3.82 100 $3.59 1000 $3.35 10000 $3.35	Buy Now
Avnet Silica	71024S15TYGI8			19 Weeks	1,000	1 - 10 - 100 - 1000 - 10000 -	Buy Now

Renesas Electronics America	71024S15TYGI8	Tape & Reel (TR)	500		1	1 $3.71 10 $3.71 100 $3.71 1000 $2.1875 10000 $2.1875	Buy Now
Renesas Electronics Corporation 71024S12TYG IC SRAM 1MBIT PARALLEL 32SOJ
Distributors	Part	Package	Stock	Lead Time	Min Order Qty	Price	Buy
DigiKey	71024S12TYG	Tube	127		1	1 $3.67 10 $3.67 100 $2.94638 1000 $2.8693 10000 $2.8693	Buy Now
Avnet Americas	71024S12TYG	Tube		18 Weeks	345	1 $2.56 10 $2.56 100 $2.56 1000 $2.56 10000 $2.56	Buy Now
Mouser Electronics	71024S12TYG		234			1 $3.67 10 $2.96 100 $2.96 1000 $2.87 10000 $2.87	Buy Now
Newark	71024S12TYG	Bulk			1	1 $3.86 10 $3.57 100 $3.16 1000 $3.02 10000 $3.02	Buy Now
Avnet Silica	71024S12TYG			19 Weeks	23	1 - 10 - 100 - 1000 - 10000 -	Buy Now

Renesas Electronics America	71024S12TYG	Tube	127		1	1 $3.67 10 $3.67 100 $2.94638 1000 $2.8693 10000 $2.8693	Buy Now
Renesas Electronics Corporation 71024S15TYGI IC SRAM 1MBIT PARALLEL 32SOJ
Distributors	Part	Package	Stock	Lead Time	Min Order Qty	Price	Buy
DigiKey	71024S15TYGI	Tube	63		1	1 $4.59 10 $4.59 100 $4.59 1000 $3.48899 10000 $3.31698	Buy Now
Avnet Americas	71024S15TYGI	Tube		18 Weeks	345	1 $2.75 10 $2.75 100 $2.75 1000 $2.75 10000 $2.75	Buy Now
Mouser Electronics	71024S15TYGI		7,395			1 $4.58 10 $4.05 100 $4.05 1000 $3.56 10000 $3.39	Buy Now
Newark	71024S15TYGI	Bulk			1	1 $4.75 10 $4.19 100 $3.9 1000 $3.58 10000 $3.58	Buy Now
Avnet Silica	71024S15TYGI			19 Weeks	23	1 - 10 - 100 - 1000 - 10000 -	Buy Now

Renesas Electronics America	71024S15TYGI	Tube	63		1	1 $4.59 10 $4.59 100 $4.0537 1000 $3.48899 10000 $3.31698	Buy Now
Renesas Electronics Corporation 71024S12YG8 IC SRAM 1MBIT PARALLEL 32SOJ
Distributors	Part	Package	Stock	Lead Time	Min Order Qty	Price	Buy
DigiKey	71024S12YG8	Reel				1 - 10 - 100 - 1000 - 10000 -	Buy Now
Renesas Electronics Corporation 71024S20YGI8 IC SRAM 1MBIT PARALLEL 32SOJ
Distributors	Part	Package	Stock	Lead Time	Min Order Qty	Price	Buy
DigiKey	71024S20YGI8	Cut Tape				1 - 10 - 100 - 1000 - 10000 -	Buy Now
	71024S20YGI8	Reel				1 - 10 - 100 - 1000 - 10000 -	Buy Now
	71024S20YGI8	Digi-Reel			1	1 $3.87 10 $3.87 100 $3.87 1000 $3.87 10000 $3.87	Buy Now

Find more 71024S price and stock on Findchips.com

71024S Datasheets (28)

Part	Manufacturer	Description	Datasheet Type	PDF
71024S12TYG	Integrated Device Technology	Integrated Circuits (ICs) - Memory - IC SRAM 1M PARALLEL 32SOJ	Original	PDF
71024S12TYG8	Integrated Device Technology	Integrated Circuits (ICs) - Memory - IC SRAM 1M PARALLEL 32SOJ	Original	PDF
71024S12TYGI	Integrated Device Technology	Integrated Circuits (ICs) - Memory - IC SRAM 1M PARALLEL 32SOJ	Original	PDF
71024S12TYGI8	Integrated Device Technology	Integrated Circuits (ICs) - Memory - IC SRAM 1M PARALLEL 32SOJ	Original	PDF
71024S12YG	Integrated Device Technology	Integrated Circuits (ICs) - Memory - IC SRAM 1M PARALLEL 32SOJ	Original	PDF
71024S12YG8	Integrated Device Technology	Integrated Circuits (ICs) - Memory - IC SRAM 1M PARALLEL 32SOJ	Original	PDF
71024S12YGI	Integrated Device Technology	Integrated Circuits (ICs) - Memory - IC SRAM 1M PARALLEL 32SOJ	Original	PDF
71024S12YGI8	Integrated Device Technology	Integrated Circuits (ICs) - Memory - IC SRAM 1M PARALLEL 32SOJ	Original	PDF
71024S15TYG	Integrated Device Technology	Integrated Circuits (ICs) - Memory - IC SRAM 1M PARALLEL 32SOJ	Original	PDF
71024S15TYG8	Integrated Device Technology	Integrated Circuits (ICs) - Memory - IC SRAM 1M PARALLEL 32SOJ	Original	PDF
71024S15TYGI	Integrated Device Technology	Integrated Circuits (ICs) - Memory - IC SRAM 1M PARALLEL 32SOJ	Original	PDF
71024S15TYGI8	Integrated Device Technology	Integrated Circuits (ICs) - Memory - IC SRAM 1M PARALLEL 32SOJ	Original	PDF
71024S15YG	Integrated Device Technology	Integrated Circuits (ICs) - Memory - IC SRAM 1M PARALLEL 32SOJ	Original	PDF
71024S15YG8	Integrated Device Technology	Integrated Circuits (ICs) - Memory - IC SRAM 1M PARALLEL 32SOJ	Original	PDF

71024S15YGI	Integrated Device Technology	Integrated Circuits (ICs) - Memory - IC SRAM 1M PARALLEL 32SOJ	Original	PDF
71024S15YGI8	Integrated Device Technology	Integrated Circuits (ICs) - Memory - IC SRAM 1M PARALLEL 32SOJ	Original	PDF
71024S20TYG	Integrated Device Technology	Integrated Circuits (ICs) - Memory - IC SRAM 1M PARALLEL 32SOJ	Original	PDF
71024S20TYG8	Integrated Device Technology	Integrated Circuits (ICs) - Memory - IC SRAM 1M PARALLEL 32SOJ	Original	PDF
71024S20TYGI	Integrated Device Technology	Integrated Circuits (ICs) - Memory - IC SRAM 1M PARALLEL 32SOJ	Original	PDF
71024S20TYGI8	Integrated Device Technology	Integrated Circuits (ICs) - Memory - IC SRAM 1M PARALLEL 32SOJ	Original	PDF

71024S Datasheets Context Search

Catalog Datasheet	MFG & Type	PDF	Document Tags
SO32-3 Abstract: IDT71024 IDT71024S70 S0323 Text: 71024S70 CMOS STATIC RAM 1 MEG 128K x 8-BIT Integrated Device Technology, Inc. FEATURES: DESCRIPTION: • 128K x 8 CMOS static RAM • Equal access and cycle times — Commercial: 70ns • Two Chip Selects plus one Output Enable pin • Bidirectional inputs and outputs directly TTL-compatible	Original	PDF	IDT71024S70 IDT71024 576-bit 200mV 300-mil SO32-2) 400-mil SO32-3) SO32-3 IDT71024S70 S0323
H9723 Abstract: h9740 l9718 L9712 L9709 L9727 T9934 l9731 L9706 l9735 Text: INTEGRATED DEVICE TECHNOLOGY, INC. QUALITY & RELIABILITY MONITORS April 1998 2975 Stender Way, Santa Clara, CA 95054 TEL: 800 345-7015 FAX: (408) 492-8674 QUALITY & RELIABILITY MONITOR REPORT April 1998 TABLE OF CONTENTS Section I: Introduction Section II:	Original	PDF	9808M 9806M 9807M H9723 h9740 l9718 L9712 L9709 L9727 T9934 l9731 L9706 l9735
Untitled Abstract: No abstract text available Text: CMOS Static RAM 1 Meg 128K x 8-Bit Features ◆ ◆ ◆ ◆ ◆ ◆ ◆ 71024S Description 128K x 8 advanced high-speed CMOS static RAM Commercial (0°C to +70°C), Industrial (–40°C to +85°C) Equal access and cycle times — Commercial and Industrial: 12/15/20ns	Original	PDF	IDT71024S 12/15/20ns IDT71024 576-bit
hc 284 Abstract: 71024S15 IDT71024 Text: CMOS Static RAM 1 Meg 128K x 8-Bit Features ◆ ◆ ◆ ◆ ◆ ◆ ◆ 71024S/MS Description 128K x 8 advanced high-speed CMOS static RAM Commercial (0°C to +70°C), Industrial (–40°C to +85°C) Equal access and cycle times — Commercial and Industrial: 12/15/20ns	Original	PDF	IDT71024S/MS 12/15/20ns IDT71024 576-bit hc 284 71024S15
Untitled Abstract: No abstract text available Text: FT71024 CMOS Static RAM 1 Meg 128K x 8-Bit Features ◆ ◆ ◆ ◆ ◆ ◆ ◆ Description 128K x 8 advanced high-speed CMOS static RAM Military (–55°C to +125°C) Equal access and cycle times military: 20ns The FT71024 is a 1,048,576-bit high-speed static RAM organized as 128K x 8. Using high-performance CMOS technology	Original	PDF	FT71024 300mil) 576-bit 200mV 400-mil SO32-3)
ATPA Abstract: 7130SA100P 24l01 7C263/4-35C 7164S15Y cy9122-25 7133SA35J 7142sa55 7130sa55p cy2149-45c Text: Product Line Cross Reference CYPRESS CYPRESS CYPRESS CYPRESS CYPRESS CY2147-35C CY7C147-35C CY7C147-45C CY7C147-35C CY91L22-35C CY7C122-35C CY2147-45C CY2147-35C CY7C148-35C CY7C148-25C+ CY91L22-45C CY93L422AC CY2147-45C CY7C147-45C CY7C148-45C CY7C148-35C	Original	PDF	CY2147-35C CY7C147-35C CY7C147-45C CY91L22-35C CY7C122-35C CY2147-45C CY7C148-35C CY7C148-25C+ ATPA 7130SA100P 24l01 7C263/4-35C 7164S15Y cy9122-25 7133SA35J 7142sa55 7130sa55p cy2149-45c
71024S15 Abstract: IDT71024 71024 Text: IDT71024 CMOS STATIC RAM 1 MEG 128K x 8-BIT Integrated Device Technology, Inc. FEATURES: DESCRIPTION: • 128K x 8 advanced high-speed CMOS static RAM • Commercial (0° to 70°C), Industrial (-40° to 85°C) and Military (-55° to 125°C) temperature options	Original	PDF	IDT71024 15/17/20/25ns 15/20ns 12/15/17/20ns MIL-STD-883, IDT71024 576-bit 300-mil SO32-2) 400-mil 71024S15 71024
Untitled Abstract: No abstract text available Text: IDT71024 CMOS Static RAM 1 Meg 128K x 8-Bit Features ◆ ◆ ◆ ◆ ◆ ◆ ◆ Description 128K x 8 advanced high-speed CMOS static RAM Commercial (0°C to +70°C), Industrial (–40°C to +85°C) Equal access and cycle times — Commercial and Industrial: 12/15/20ns	Original	PDF	12/15/20ns IDT71024 IDT71024 576-bit x4033
71016S20PHG8 Abstract: 71016S15YG 71256SA15Y 71256SA20YI 71256-sa15y 71256sa25tp 7164 71V124SA12YGI 6116SA25TPGI 71V424L10PHG Text: Integrated Device Technology, Inc. 6024 Silver Creek Valley Road, San Jose, CA 95138 Phone #: 408 284-8200 PRODUCT DISCONTINUANCE NOTICE (PDN) PDN #: Issue Date: Contact: Title: Phone #: Fax #: E-mail: SR-09-08R1 29-Apr-2010 Last Buy Deadline for Submission of Order:	Original	PDF	SR-09-08R1 29-Apr-2010 26-Jul-2010 25-Oct-2010 71V424YL15PHI 71V424YL15PHI8 71V424YS10PH 71V424YS10PH8 71V424YS10PHI 71016S20PHG8 71016S15YG 71256SA15Y 71256SA20YI 71256-sa15y 71256sa25tp 7164 71V124SA12YGI 6116SA25TPGI 71V424L10PHG
71256-sa15y Abstract: 71256sa25tp 71256SA15TP 71016s12y 71256SA15Y 7164S20Y 71256SA20YI 71024S15Y 6116SA15TPG 7164L25YGI Text: Integrated Device Technology, Inc. 6024 Silver Creek Valley Road, San Jose, CA 95138 Phone #: 408 284-8200 PRODUCT DISCONTINUANCE NOTICE (PDN) PDN #: Issue Date: Contact: Title: Phone #: Fax #: E-mail: SR-09-08 Last Buy Deadline for Submission of Order:	Original	PDF	SR-09-08 31-Jan-2010 31-Jan-2011 30-Apr-2011 Fa024 71V424YL15PHI 71V424YL15PHI8 71V424YS10PH 71V424YS10PH8 71256-sa15y 71256sa25tp 71256SA15TP 71016s12y 71256SA15Y 7164S20Y 71256SA20YI 71024S15Y 6116SA15TPG 7164L25YGI
Untitled Abstract: No abstract text available Text: CMOS Static RAM 1 Meg 128K x 8-Bit 71024S Features Description ◆ The IDT71024 is a 1,048,576-bit high-speed static RAM organized as 128K x 8. It is fabricated using high-performance, high-reliability CMOS technology. This state-of-the-art technology, combined with innovative	Original	PDF	IDT71024S IDT71024 576-bit
6116 CMOS RAM Abstract: IDT71024 71024S15 Text: CMOS Static RAM 1 Meg 128K x 8-Bit Features ◆ ◆ ◆ ◆ ◆ ◆ ◆ IDT71024 Description 128K x 8 advanced high-speed CMOS static RAM Commercial (0°C to +70°C), Industrial (–40°C to +85°C) Equal access and cycle times — Commercial and Industrial: 12/15/20ns	Original	PDF	IDT71024 12/15/20ns IDT71024 576-bit hig20ns 6116 CMOS RAM 71024S15
L9939 Abstract: B897 k9920 L9924 k1917 JESD22-B100 K9928 K2837 P9848 h9910 Text: INTEGRATED DEVICE TECHNOLOGY, INC. QUALITY & RELIABILITY MONITORS October 1999 2975 Stender Way, Santa Clara, CA 95054 TEL: 800 345-7015 FAX: (408) 492-8674 QUALITY & RELIABILITY MONITOR REPORT October 1999 TABLE OF CONTENTS Section I: Introduction Section II:	Original	PDF	--D28 723646Y Y12142 77105Z Y12171G 65V500A P27999G 11V256YY B10996 63244L L9939 B897 k9920 L9924 k1917 JESD22-B100 K9928 K2837 P9848 h9910
IDT71024 Abstract: 71024S15 Text: CMOS Static RAM 1 Meg 128K x 8-Bit Features ◆ ◆ ◆ ◆ ◆ ◆ ◆ IDT71024 Description 128K x 8 advanced high-speed CMOS static RAM Commercial (0°C to +70°C), Industrial (–40°C to +85°C) Equal access and cycle times — Commercial and Industrial: 12/15/20ns	Original	PDF	IDT71024 12/15/20ns IDT71024 576-bit 71024S15

IC 9637 Abstract: A101 A102 A104 A106 A110 11256E pqfp100 71124X IDT QUALITY & RELIABILITY MONITOR REPORT Text: INTEGRATED DEVICE TECHNOLOGY, INC. QUALITY & RELIABILITY MONITORS July 1997 IDT QUALITY SERVICE QSP PERFORMANCE 2975 Stender Way, Santa Clara, CA 95054 TEL: 800 345-7015 FAX: (408) 492-8674 IDT QUALITY & RELIABILITY MONITOR REPORT July 1997 TABLE OF CONTENTS	Original	PDF	71V280Y PQFP-128 300cycle VII-13 IC 9637 A101 A102 A104 A106 A110 11256E pqfp100 71124X IDT QUALITY & RELIABILITY MONITOR REPORT
EPM5128LC Abstract: IDT CYPRESS CROSS REFERENCE clocks epm5064lc-1 EPM5128LC-1 EPM5064LC EPM5128LC-2 EPM5128GI EPM5128JC-1 8464c 5962-8871309 Text: Product Line Cross Reference CYPRESS CYPRESS CYPRESS CYPRESS CYPRESS CY2148-35C CY21L48-35C CY7C168A-35C CY7C168A-25C 5962-8871309XX 5962-89839112X CY2148-35C CY7C148-35C CY7C168A-45M CY7C168A-35M+ 5962-8871310RX 5962-8983913RX CY2148-35M CY7C148-35M CY7C169A-35C	Original	PDF	CY2148-35C CY21L48-35C CY7C168A-35C CY7C168A-25C 5962-8871309XX 5962-89839112X CY7C148-35C CY7C168A-45M CY7C168A-35M+ EPM5128LC IDT CYPRESS CROSS REFERENCE clocks epm5064lc-1 EPM5128LC-1 EPM5064LC EPM5128LC-2 EPM5128GI EPM5128JC-1 8464c 5962-8871309
h9740 Abstract: k1917 B934 L9726 Y9846 H9817 n9831 l9735 9806 9826 320 Text: INTEGRATED DEVICE TECHNOLOGY, INC. QUALITY & RELIABILITY MONITORS January 1999 2975 Stender Way, Santa Clara, CA 95054 TEL: 800 345-7015 FAX: (408) 492-8674 QUALITY & RELIABILITY MONITOR REPORT January 1999 TABLE OF CONTENTS Section I: Introduction Section II:	Original	PDF	72201X H54480G T11747 7280Q 60210D D00725 P23419G 42V509Z P23393G 71V124T h9740 k1917 B934 L9726 Y9846 H9817 n9831 l9735 9806 9826 320
Untitled Abstract: No abstract text available Text: CMOS STATIC RAM 1 MEG 128K x 8-BIT IDT71024 Integrated Device Technology, Inc. FEATURES: DESCRIPTION: • 128K x 8 advanced high-speed C M O S static R AM • Equal access and cycle times — Military: 1 5 /1 7 /2 0 /2 5 n s — Com m ercial: 1 2 /1 5 /1 7/20n s	OCR Scan	PDF	IDT71024 7/20n MIL-STD-883, L32-2) 300-mil S032-2) 400-mil S032-3) 4A25771
y 4m Abstract: 641BL Text: CM O S STATIC RAM 1 MEG 128K x 8-BIT IDT71024 FEATURES: DESCRIPTION: • 128K x 8 a d v a n ce d h ig h -s p e e d C M O S s ta tic R AM T h e ID T 7 1 0 2 4 is a 1 ,0 4 8 ,5 7 6 -b it h ig h -s p e e d sta tic R AM o rg a n iz e d a s 128K x 8. It is fa b ric a te d u sing ID T ’s highp e rfo rm a n c e , h ig h -re lia b ility C M O S te c h n o lo g y. T h is sta teo f-th e -a rt te c h n o lo g y , c o m b in e d w ith in n o va tive c irc u it d esign	OCR Scan	PDF	IDT71024 300-mil 400-m MIL-STD-883, L32-2) y 4m 641BL
CHN 920 Abstract: 71024S15 chn 830 Text: jdt CMOS STATIC RAM 1 MEG 128Kx 8-BIT) IDT71024 ïite g ia te d D ev ize T ech n o logy, ï i c . FEATURES: DESCRIPTION: • 128K x 8 advanced high-speed CM O S static RAM • Com m ercial (0° to 70°C), Industrial (-40° to 85°C) and M ilitary (-55° to 125°C) tem perature options	OCR Scan	PDF	128Kx IDT71024 15/17/20/25ns 15/20ns 12/15/17/20ns IL-STD-883, T71024 576-bit MS-027, CHN 920 71024S15 chn 830
IDT71024 Abstract: DSC101 Text: CMOS STATIC RAM 1 MEG 128KX 8-BIT IDT71024 Integrated D evice Téchn olog y, Inc. FEATURES: DESCRIPTION: • 128K x 8 advanced high-speed CMOS static RAM • Equal access and cycle times — Military: 15/17/20/25ns — Commercial: 12/15/17/20ns • Two Chip Selects plus one Output Enable pin	OCR Scan	PDF	128KX IDT71024 15/17/20/25ns 12/15/17/20ns 32-pin MIL-STD-883, IDT71024 576-bit 4A25771 001517b DSC101
Untitled Abstract: No abstract text available Text: CMOS STATIC RAM 1 MEG 128Kx 8-BIT ADVANCE INFORMATION IDT71024 Integrated D evice T ech nology, Inc. FEATURES: DESCRIPTION: • 128K x 8 advanced high-speed C M O S static RAM • Equal access and cycle tim es — M ilitary: 20/25ns — C om m ercial: 15 /17ns	OCR Scan	PDF	128Kx IDT71024 20/25ns /17ns 32-pin T71024 576-bit 400-m D32-2)
S0323 Abstract: IDT71024S70 K 3568 Text: CMOS STATIC RAM 1 MEG 128K x 8-BIT 71024S70 FEATURES: DESCRIPTION: • 1 2 8 K x 8 CM O S static RAM • Equal access and cycle times — Commercial: 70ns • Two Chip Selects plus one Output Enable pin • Bidirectional inputs and outputs directly TTL-compatible	OCR Scan	PDF	IDT71024S70 T71024 576-bit MO-061, S5771 S0323 IDT71024S70 K 3568
Untitled Abstract: No abstract text available Text: CMOS STATIC RAM 1 MEG 128KX 8-BIT IDT71024 Integrated D evice Technology, Inc. FEATURES: DESCRIPTION: • 128K x 8 advanced high-speed CM OS Static RAM • Equal access and cycle tim es — Military: 17/20/25ns — Com m ercial: 15/17/20ns _ • Two Chip Selects plus one O utput Enable (OE) pin	OCR Scan	PDF	128KX IDT71024 17/20/25ns 15/17/20ns 32-pin 400mil IL-STD-883, IDT71024 576-bit MIL-STD-883,

Privacy Settings

71024S Search Results

71024S Result Highlights (5)

71024S Price and Stock

Renesas Electronics Corporation 71024S15TYGI8

Renesas Electronics Corporation 71024S12TYG

Renesas Electronics Corporation 71024S15TYGI

Renesas Electronics Corporation 71024S12YG8

Renesas Electronics Corporation 71024S20YGI8

71024S Datasheets (28)

71024S Datasheets Context Search

SO32-3

H9723

Untitled

hc 284

Untitled

ATPA

71024S15

Untitled

71016S20PHG8

71256-sa15y

Untitled

6116 CMOS RAM

L9939

IDT71024

IC 9637

EPM5128LC

h9740

Untitled

y 4m

CHN 920

IDT71024

Untitled

S0323

Untitled