K4B4G1646E-BMMA Industrial DDR3L for Legacy BOM Support
K4B4G1646E-BMMA Industrial DDR3L for Legacy BOM Support
K4B4G1646E-BMMA is a Samsung 4Gb DDR3L SDRAM designed for systems that need a 16-bit data bus, DDR3L-1866 performance and industrial temperature coverage. For OEM and EMS buyers, its value is strongest in approved legacy platforms where exact BOM continuity matters; Samsung lists the device as end of life, so supply verification and traceability are essential.
Quick Answer
Choose K4B4G1646E-BMMA when the approved design requires 4Gb (512MB), 256M × 16 DDR3L at up to 1866Mb/s per pin in a 96-ball FBGA package and a −40°C to +95°C operating range. Do not substitute a same-capacity DDR3 device without engineering validation.

Concept illustration—not an actual Samsung product photograph or package drawing.
Product Overview and Positioning
The device is a 4Gb E-die DDR3L SDRAM organized as 256M × 16. Four gigabits equal 512 megabytes of raw capacity per chip—not 4GB. At its 1866Mb/s-per-pin rating and 16-bit width, the theoretical peak transfer rate is about 3.73GB/s per device before protocol and system overhead.
The BMMA suffix identifies the industrial-temperature, normal-power, DDR3L-1866 option in Samsung’s ordering table. This distinction matters because the related BYMA device shares the 1866 speed grade but is the commercial-temperature version, while BMK0 is industrial-temperature DDR3L-1600.
Four Procurement Advantages
1 Industrial Temperature Coverage
The −40°C to +95°C range supports demanding embedded and industrial environments. Above 85°C, the datasheet specifies a shorter average refresh period, so the memory controller and thermal design must support the high-temperature operating conditions.
2 DDR3L 1866 Performance
The device supports transfer rates up to 1866Mb/s per pin with a 933MHz clock and a listed 13-13-13 speed bin. It is also backward compatible with DDR3L-1600 and DDR3L-1333 speed operation, subject to the controller configuration and full timing validation.
3 Dual Voltage Compatibility
The SDRAM supports JEDEC-standard 1.35V DDR3L operation and 1.5V operation. Procurement should still match the released BOM because voltage support alone does not prove pinout, timing, layout or firmware equivalence.
4 Compact x16 Organization
A 256M × 16 organization provides 512MB of raw capacity in one 96-ball FBGA device. This can suit compact controller boards where a 16-bit memory channel is already designed and qualified.
Technical Parameters and Buying Interpretation
|
Parameter |
Official specification |
Procurement meaning |
|
Manufacturer |
Samsung |
Verify top marking, label and lot traceability. |
|
Memory type |
4Gb E-die DDR3L SDRAM |
Volatile system memory; data is lost without power. |
|
Organization |
256M × 16; 8 banks |
Equals 512MB raw capacity per device. |
|
Speed grade |
DDR3L-1866, 13-13-13 |
Up to 1866Mb/s per pin; 933MHz clock. |
|
Voltage |
1.35V or 1.5V operation |
Confirm VDD, VDDQ and controller settings. |
|
Temperature |
−40°C to +95°C |
Industrial BM suffix; validate board thermals. |
|
Package |
96-ball FBGA, x16 |
Confirm footprint, ball map and reflow profile. |
|
Product status |
EOL on Samsung page |
Use lifecycle-controlled sourcing and approval. |
Specifications above are identification and screening data. Production release should use the controlled Samsung datasheet, approved-vendor requirements and the exact purchasing suffix.
Suitable Application Scenarios

Industrial HMI and controller application concept.
Industrial Controllers and HMIs
K4B4G1646E-BMMA is relevant to established industrial controllers, operator panels and gateways that were designed around a 16-bit DDR3L interface. Retain the released memory initialization, PCB layout and thermal limits.
Networking and Communication Equipment
Legacy routers, access terminals and embedded communication boards may use the device as processor working memory. Validate signal integrity, timing margins and boot firmware before approving any alternative.
Repair and Long Lifecycle Production
The part can support repair, maintenance and controlled continuation builds where redesign costs exceed the value of preserving an approved BOM. Because it is EOL, demand planning should include remaining lifetime quantity, inspection and redesign contingencies.
Buyer Pain Points and Practical Responses
|
Pain point |
Practical response |
|
4Gb is mistaken for 4GB |
Record the raw capacity as 512MB per device. |
|
A BYMA or BMK0 suffix is offered |
Check temperature and speed differences; obtain engineering approval. |
|
EOL stock has uncertain origin |
Require supplier qualification, traceability, photos and lot-level documents. |
|
A same-capacity DDR3L is proposed |
Compare package, ball map, organization, timing, voltage and initialization. |
|
Long storage raises handling risk |
Confirm dry-pack condition, MSL controls, bake history and solderability plan. |
Verified Lifecycle Signal

Incoming inspection and traceability concept for lifecycle-controlled DDR3L sourcing.
Samsung’s product page identifies K4B4G1646E-BMMA as EOL. This is the central sourcing fact for procurement planning: a quotation or broker listing does not change manufacturer lifecycle status. Request a dated offer, available quantity, date and lot codes, packaging condition, traceability evidence and the proposed inspection scope before scheduling production.
A practical calculation also prevents specification errors: 4Gb ÷ 8 = 512MB raw capacity, while 1866Mb/s × 16 ÷ 8 ≈ 3.73GB/s theoretical peak bandwidth. These figures describe one device and should not be confused with module capacity or delivered system performance.
Frequently Asked Questions
Is K4B4G1646E-BMMA a 4GB memory chip?
No. It is a 4Gb device, equal to 512MB of raw capacity.
Is BMMA an industrial-temperature suffix?
Yes. Samsung lists BMMA for industrial temperature and normal power, with DDR3L-1866 speed.
Can K4B4G1646E-BYMA replace it?
Not automatically. BYMA is the commercial-temperature 1866 option; an engineering and environmental review is required.
Can K4B4G1646E-BMK0 replace it?
Not automatically. BMK0 is the industrial DDR3L-1600 speed option, so timing and controller settings must be reviewed.
Does EOL mean no stock exists anywhere?
No. EOL describes manufacturer lifecycle status, not real-time market inventory. Any available stock still needs source and condition verification.
What should an RFQ include?
Provide the full MPN, quantity, target date, destination, acceptable date codes, packaging, traceability and inspection requirements, plus whether alternatives may be proposed.
Request a Project Specific Quote
K4B4G1646E-BMMA is best evaluated for an existing approved design that needs 512MB per device, a ×16 DDR3L interface, industrial temperature capability and DDR3L-1866 speed. Send our sales team the required quantity, delivery date, target application and acceptance criteria. Ask for exact-part confirmation, lot information, packaging condition, traceability and inspection options before ordering.
Technical Sources
Samsung Semiconductor product page for K4B4G1646E-BMMA. View source
Samsung K4B4G1646E DDR3L datasheet mirror for ordering and timing details. View source