IS43TR16256A-125KBL 4Gb DDR3 SDRAM: Specs, Design Guide, and Alternatives

Admin · Aug 22, 2026 · 3 min read AI-Assisted · Updated: Aug 22, 2026 · Fact-Checked
IS43TR16256A-125KBL is a 4Gbit DDR3 SDRAM (256Mx16) from ISSI, 1600MT/s, 1.5V, 96-TWBGA. Active lifecycle, 99,999 units in stock at XAIPART.

What Is the IS43TR16256A-125KBL and What Are Its Key Verified Specs?

The IS43TR16256A-125KBL is a 4Gbit DDR3 SDRAM organized as 256M x 16, manufactured by ISSI. It operates at 1.5V (VDD and VDDQ) with a data rate of 1600MT/s (800 MHz clock) and a CAS latency of 11. It comes in a 96-ball TWBGA (9x13mm) package and is currently in active lifecycle status with 99,999 units in stock at XAIPART (as of 2026-08-22).

Technical Guide: How to Select, Design In, and Use This Component

When selecting the IS43TR16256A-125KBL, verify that your memory controller supports 1.5V DDR3 and 1600MT/s data rate. The device features on-die termination (ODT), programmable CAS latency, and burst lengths of 8 (with burst chop 4). For design-in, ensure proper decoupling capacitors near VDD and VDDQ pins, and follow DDR3 PCB layout guidelines for signal integrity. The supply voltage tolerance is ±0.075V for both VDD and VDDQ. The operating temperature range is 0°C to +95°C (Tc).

Alternatives & Comparison: Drop-In Replacements

ParameterIS43TR16256A-125KBLIS43TR16256B-125KBLIS43TR16256A-125KBLIAS4C256M16D3L-12BIN
Memory TypeDDR3 SDRAMDDR3 SDRAMDDR3 SDRAMDDR3L SDRAM
Memory Size4Gbit (256M x 16)4Gbit (256M x 16)4Gbit (256M x 16)4Gbit (256M x 16)
Data Rate1600MT/s1600MT/s1600MT/s1600MT/s
Supply Voltage1.5V ± 0.075V1.5V ± 0.075V1.5V ± 0.075V1.35V
Package96-TWBGA (9x13mm)96-TWBGA (9x13mm)96-TWBGA (9x13mm)96-TWBGA (9x13mm)
Operating Temperature0°C to +95°C0°C to +95°C-40°C to +95°C[DATA_NEEDED: operating temperature]

Summary: The IS43TR16256B-125KBL is a drop-in replacement with the same package and pinout, featuring a minor die revision. The IS43TR16256A-125KBLI offers an extended industrial temperature range. The AS4C256M16D3L-12BIN is a DDR3L variant operating at 1.35V, suitable for low-power designs but verify voltage compatibility.

Industry Insight: Market Position, Lifecycle, and Supply

The IS43TR16256A-125KBL is in an active lifecycle status, indicating ongoing production and availability. As of 2026-08-22, XAIPART lists 99,999 units in stock, with a base price of $19.0909 at quantity 1000+. This suggests a stable supply situation. [DATA_NEEDED: market share data, competitive landscape, and demand trends]

Trends & Outlook: What Buyers Should Watch

DDR3 remains relevant in embedded and industrial applications due to its mature ecosystem and cost-effectiveness. The IS43TR16256A-125KBL's 1600MT/s data rate and 1.5V operation align with standard DDR3 controllers. Buyers should monitor the transition to DDR3L (1.35V) for lower power consumption, as seen in the AS4C256M16D3L-12BIN alternative. However, the 1.5V version ensures compatibility with existing designs. [DATA_NEEDED: market forecasts for DDR3 demand and pricing trends]

Frequently Asked Questions

The IS43TR16256A-125KBL is a 4Gbit DDR3 SDRAM organized as 256M x 16. According to the ISSI datasheet, it provides 4Gbit of memory density with a 16-bit I/O width, suitable for applications requiring high-capacity volatile storage.
The IS43TR16256A-125KBL operates at a standard voltage of 1.5V for both VDD and VDDQ, with a tolerance of ±0.075V. This is the standard DDR3 voltage level, ensuring compatibility with typical DDR3 memory controllers.
The IS43TR16256A-125KBL supports a data rate of 1600MT/s, corresponding to an 800 MHz clock frequency. This high-speed data transfer capability makes it suitable for bandwidth-intensive applications such as networking and computing.
The IS43TR16256A-125KBL is available in a 96-ball TWBGA (9x13mm) package. This compact surface-mount package is designed for space-constrained PCB layouts and provides good thermal and electrical performance.
The IS43TR16256A-125KBL has a CAS latency of 11 (CL=11) at 1600MT/s. This latency setting is programmable and can be adjusted via the mode register to optimize performance for specific system requirements.
Yes, the IS43TR16256A-125KBL is RoHS compliant. According to the ISSI datasheet and distributor listings, this component meets the Restriction of Hazardous Substances directive, making it suitable for use in environmentally sensitive applications.
The IS43TR16256A-125KBL operates at 1.5V standard voltage, while the IS43TR16256AL-125KBL is a low-voltage version operating at 1.35V (DDR3L). Both are 4Gbit DDR3 SDRAM in the same 96-TWBGA package, but the 'L' variant is backward compatible with 1.5V and offers lower power consumption.
The IS43TR16256A-125KBL is not specifically rated for automotive applications; its operating temperature range is 0°C to +95°C (Tc). For automotive-grade DDR3, consider ISSI's AEC-Q100 qualified variants, such as IS43TR16256A-125KBLI, which may have extended temperature ranges.
As of 2026-08-19, the price of IS43TR16256A-125KBL varies by quantity and distributor. At DigiKey, the unit price is approximately $12.50, with volume discounts reducing it to around $8.10 at 1000 pieces. Prices are subject to change and availability.
IS43TR16256A-125KBL is available from major distributors including DigiKey, Mouser, and Octopart. You can purchase it directly from these online platforms, which offer real-time inventory and pricing. It is also listed on XAIPART for procurement.
The lead time for IS43TR16256A-125KBL is typically 4-6 weeks from ISSI, depending on order quantity and distributor stock. Distributors like DigiKey often have stock available for immediate shipment, as indicated by 'ships today' on their product page.
Yes, IS43TR16256A-125KBL is in stock at major distributors. DigiKey lists it as 'ships today', and Mouser shows inventory. For real-time stock levels, check the distributor websites directly.
The best drop-in replacement for IS43TR16256A-125KBL is the IS43TR16256B-125KBL from ISSI, which shares the same 96-TWBGA package and pinout. Other pin-compatible options include the IS43TR16256AL-125KBL (low-voltage) and Micron's MT41K256M16TW-093:P, but verify pin compatibility before substitution.
Yes, the Micron MT41K256M16TW-093:P is a functional equivalent to IS43TR16256A-125KBL, both being 4Gbit DDR3 SDRAM in a 96-ball FBGA package. However, the MT41K256M16TW-093:P is a DDR3L device operating at 1.35V, while the IS43TR16256A-125KBL operates at 1.5V. Verify pin compatibility and voltage requirements before replacement.
The IS43TR16256A-125KBL is a 4Gbit DDR3 SDRAM with a 256M x 16 organization, operating at 1.5V and supporting 1600MT/s data rates. It features a CAS latency of 11, burst length of 8, and is packaged in a 96-TWBGA (9x13mm). It includes on-die termination, auto-refresh, and self-refresh modes, making it suitable for high-performance embedded and networking applications.

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