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Title	Document #	Date
Part Model Electrical Guidelines for Electronic-Device Packages – XML Requirements	JEP30-E100G	Feb 2025
This standard establishes the requirements for exchanging part data between part manufacturers and their customers for electrical and electronic products. This standard applies to all forms of electronic parts. It forms part of the Part Model XML Schema, which covers the parental structure for the electrical, physical, Electrical, assembly process classification data along with materials and substances that may be present in the supplied product or subproducts. This Guideline specifically focuses on the “Electrical” sub-section of the Part Model. For more information visit the main JEP30 webpage. Committee(s): JC-11, JC-11.2, JC-16 Free download. Registration or login required.
LPDDR5/5X Serial Presence Detect (SPD) Contents Release Number: 1.0	JESD406-5A	Nov 2024
This publication describes the serial presence detect (SPD) values for all LPDDR5/5X memory modules. In this context, “modules” applies to memory modules like traditional Dual In-line Memory Modules (DIMMs) or solder-down motherboard applications. The SPD data provides critical information about all modules on the memory channel and is intended to be use by the system's BIOS in order to properly initialize and optimize the system memory channels. The storage capacity of the SPD non-volatile memory is limited, so a number of techniques are employed to optimize the use of these bytes, including overlays and run length limited coding. Committee(s): JC-45 Free download. Registration or login required.
DDR5 SERIAL PRESENCE DETECT (SPD) CONTENTS Release Number: Release 1.3	JESD400-5C	Sep 2024
This standard describes the serial presence detect (SPD) values for all DDR5 memory modules. In this context, “modules” applies to memory modules like traditional Dual In-line Memory Modules (DIMMs) or solder-down motherboard applications. The SPD data provides critical information about all modules on the memory channel and is intended to be use by the system's BIOS in order to properly initialize and optimize the system memory channels. Committee(s): JC-45 Free download. Registration or login required.
DDR5 SDRAM Release Number: Version 1.31	JESD79-5C.01	Jul 2024
Version 1.31 This standard defines the DDR5 SDRAM specification, including features, functionalities, AC and DC characteristics, packages, and ball/signal assignments. The purpose of this Standard is to define the minimum set of requirements for JEDEC compliant 8 Gb through 32 Gb for x4, x8, and x16 DDR5 SDRAM devices. This standard was created based on the DDR4 standards (JESD79-4) and some aspects of the DDR, DDR2, DDR3, and LPDDR4 standards (JESD79, JESD79-2, JESD79-3, and JESD209-4). Committee(s): JC-42, JC-42.3 Available for purchase: $423.00 Add to Cart To help cover the costs of producing standards, JEDEC is now charging for non-member access to selected standards and design files. Most of the content on this site remains free to download with registration. Paying JEDEC member companies enjoy free access to all content. Learn more and apply today. Paying JEDEC Members may login for free access.
Low Power Double Data Rate 4 (LPDDR4)	JESD209-4E	Jun 2024
This document defines the LPDDR4 standard, including features, functionalities, AC and DC characteristics, packages, and ball/signal assignments. The purpose of this specification is to define the minimum set of requirements for a JEDEC compliant 16 bit per channel SDRAM device with either one or two channels. LPDDR4 dual channel device density ranges from 2 Gb through 32 Gb and single channel density ranges from 1 Gb through 16 Gb. Committee(s): JC-42, JC-42.6 Available for purchase: $374.00 Add to Cart Paying JEDEC Members may login for free access.
LOW POWER DOUBLE DATA RATE (LPDDR) 5/5X	JESD209-5C	Jul 2023
This document defines the LPDDR5/LPDDR5X standard, including features, functionalities, AC and DC characteristics, packages, and ball/signal assignments. The purpose of this specification is to define the minimum set of requirements for a JEDEC compliant x16 one channel SDRAM device and x8 one channel SDRAM device. LPDDR5/LPDDR5X device density ranges from 2 Gb through 32 Gb. This document was created using aspects of the following standards: DDR2 (JESD79-2), DDR3 (JESD79-3), DDR4 (JESD79-4), LPDDR (JESD209), LPDDR2 (JESD209-2), LPDDR3 (JESD209-3), and LPDDR4 (JESD209-4). Committee(s): JC-42, JC-42.6 Available for purchase: $459.00 Add to Cart Paying JEDEC Members may login for free access.
FBDIMM: ARCHITECTURE AND PROTOCOL	JESD206.01	Feb 2023
Terminology update. This standard includes four chapters of the FBD Channel Specification (cover) Channel Overview (Chapter 2), Initialization (Chapter 3), Channel Protocol (Chapter 4), and Reliability, Availability, and Serviceability (RAS) (Chapter 5). Patents(): There are known patent issues that are common to all FBDIMM related specifications. See document for link to FBDIMM Patents. Committee(s): JC-40 Free download. Registration or login required.
DEFINITION OF THE SSTE32882 REGISTERING CLOCK DRIVER WITH PARITY AND QUAD CHIP SELECTS FOR DDR3/DDR3L/DDR3U RDIMM 1.5 V/1.35 V/1.25 V APPLICATIONS	JESD82-29A.01	Jan 2023
Terminology update. This standard defines standard specifications of DC interface parameters, switching parameters, and test loading for definition of the SSTE32882 registered buffer with parity for driving address and control nets on DDR3/DDR3L/DDR3U RDIMM applications. The purpose is to provide a standard for the SSTE32882 (see Note) logic device, for uniformity, multiplicity of sources, elimination of confusion, ease of device specification, and ease of use. Committee(s): JC-40, JC-40.3, JC-40.4 Free download. Registration or login required.
DDR4 REGISTERING CLOCK DRIVER (DDR4RCD02)	JESD82-31A.01	Jan 2023
Terminology update. This document defines standard specifications of DC interface parameters, switching parameters, and test loading for definition of the DDR4 Registering Clock Driver (RCD) with parity for driving address and control nets on DDR4 RDIMM and LRDIMM applications. Patents(): A complete list of Assurance/Disclosure Forms is available to JEDEC members in the Members Area. Non-members can obtain individual Assurance/Disclosure Forms on request from the JEDEC office. Committee(s): JC-40.4 Free download. Registration or login required.
LRDIMM DDR3 MEMORY BUFFER (MB)	JESD82-30.01	Jan 2023
Terminology update. The Load Reduced DIMM (LRDIMM) Memory Buffer (MB) supports DDR3 SDRAM main memory. The Memory Buffer allows buffering of memory traffic to support large memory capacities. Unlike DDR3 Register Buffer (SSTE32882), which only buffers Command, Address, Control and Clock, the LRDIMM Memory Buffer also buffers the Data (DQ) interface between the Memory Controller and the DRAM components. Committee(s): JC-40, JC-40.4 Free download. Registration or login required.
BYTE ADDRESSABLE ENERGY BACKED INTERFACE	JESD245E	Apr 2022
This standard specifies the host and device interface for a DDR4 NVDIMM-N, which is a DIMM that achieves non-volatility by copying SDRAM contents into non-volatile memory (NVM) when host power is lost using an Energy Source managed by either the module or the host. This standard is used in conjunction with JESD248. Item 2233.54G Committee(s): JC-45.6 Free download. Registration or login required.
DDR4 SDRAM STANDARD	JESD79-4D	Jul 2021
This document defines the DDR4 SDRAM specification, including features, functionalities, AC and DC characteristics, packages, and ball/signal assignments. The purpose of this Standard is to define the minimum set of requirements for JEDEC compliant 2 Gb through 16 Gb for x4, x8, and x16 DDR4 SDRAM devices. This standard was created based on the DDR3 standard (JESD79-3) and some aspects of the DDR and DDR2 standards (JESD79, JESD79-2). Committee Item 1716.78H Committee(s): JC-42.3C Available for purchase: $284.00 Add to Cart Paying JEDEC Members may login for free access.
240-Pin PC3-6400/PC3-8500/PC3-10600/PC3-12800/PC3-14900/PC3-17000 DDR3 SDRAM Unbuffered DIMM Design Specification	MODULE4.20.19	May 2021
Release No. 31. Item 2131.03, 2078.04, 2131.06 This revision contains terminology updates only. Committee(s): JC-45, JC-45.2, JC-45.3 JESD21-C Solid State Memory Documents Main Page Free download. Registration or login required.
PC-2700/PC-3200 Registered DIMM Design Specification Revision 2.2	MODULE4.20.7	May 2021
Release 31. Item 2029.04 This revision contains terminology updates only. Committee(s): JC-45, JC-45.1 JESD21-C Solid State Memory Documents Main Page Free download. Registration or login required.
Addendum No. 1 to JESD79-4, 3D STACKED DRAM	JESD79-4-1B	Feb 2021
This document defines the 3DS DDR4 SDRAM specification, including features, functionalities, AC and DC characteristics, packages, and ball/signal assignments. The purpose of this specification is to define the minimum set of requirements for a compliant 8 Gbit through 128 Gbit for x4, x8 3DS DDR4 SDRAM devices. This addendum was created based on the JESD79-4 DDR4 SDRAM specification. Each aspect of the changes for 3DS DDR4 SDRAM operation was considered. Item 1727.58G Committee(s): JC-42.3C Free download. Registration or login required.
SPD Annex L: Serial Presence Detect (SPD) for DDR4 SDRAM Modules, Release 6 Release Number: 30	SPD4.1.2.L-6	Nov 2020
This annex describes the serial presence detect (SPD) values for all DDR4 modules covered in Document Release 6. Differences between module types are encapsulated in subsections of this annex. These presence detect values are those referenced in the SPD standard document for ‘Specific Features’. Item 2220.01H. Committee(s): JC-45 JESD21-C Solid State Memory Documents Main Page Free download. Registration or login required.
Annex A: Differences between JESD21C Release 29 and its predecessor JESD21C, Release 28. Release Number: 29	AnnexA - JESD21C	Jan 2020
This table briefly describes the changes made to this standard, JESD21-C, Release 29, compared to its predecessor, JESD21C, Release 28. Committee(s): JC-42.2, JC-42.3 JESD21-C Solid State Memory Documents Main Page Free download. Registration or login required.
288-Pin, 1.2 V (VDD), PC4-1600/PC4-1866/PC4-2133/PC4-2400/PC4-2666/PC4-3200 DDR4 SDRAM Unbuffered DIMM Design Specification Release Number: 29	MODULE4.20.26	Aug 2019
This specification defines the electrical and mechanical requirements for the 288-pin, 1.2 Volt (VDD), Unbuffered, Double Data Rate, Synchronous DRAM Dual In-Line Memory Modules (DDR4 SDRAM UDIMMs). These DDR4 Unbuffered DIMMs are intended for use as main memory when installed in PCs. Item 2241.13A Committee(s): JC-45.3 JESD21-C Solid State Memory Documents Main Page Free download. Registration or login required.
260-Pin, 1.2 V (VDD), PC4-1600/PC4-1866/PC4-2133/PC4-2400/PC4-2666/PC4-3200 DDR4 SDRAM SODIMM Design Specification Release Number: 29	MODULE4.20.25	Aug 2019
This document defines the electrical and mechanical requirements for 260 pin, 1.2 V (VDD), Small Outline, Double Data Rate, Synchronous DRAM Dual In-Line Memory Modules (DDR4 SDRAM SODIMMs). These DDR4 SODIMMs are intended for use as main memory when installed in PCs, laptops and other systems. This document also contains the DDR4 DIMM Label, Ranks Definition. Item 2224.13A Committee(s): JC-45.3 JESD21-C Solid State Memory Documents Main Page Free download. Registration or login required.
SPD Annex L, Serial Presence Detect (SPD) for DDR4 SDRAM Modules, Release 4 Release Number: 27A	SPD4.1.2.L-4	Aug 2019
This annex describes the serial presence detect (SPD) values for all DDR4 modules covered in Document Release 4. Differences between module types are encapsulated in subsections of this annex. These presence detect values are those referenced in the SPD standard document for ‘Specific Features’. Item 2220.01G. This is an editorial revision to the publication in January 2017. Committee(s): JC-45 JESD21-C Solid State Memory Documents Main Page Free download. Registration or login required.

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JEDEC Education Series: Memory, Mobile & Modules