H5TQ4G63CFR DDR3 SDRAM Alternative & Replacement Guide

The SK hynix H5TQ4G63CFR is a 4Gb DDR3 SDRAM device widely used in embedded computing, industrial electronics, networking equipment, and other systems based on legacy DDR3 platforms.

As DDR3 components mature and certain H5TQ4G63CFR variants become harder to source, engineers and purchasing teams may need to evaluate compatible alternatives for long-lifecycle products.

This guide summarizes the key specifications of H5TQ4G63CFR and the main parameters that should be checked when evaluating a replacement.

H5TQ4G63CFR Key Specifications

According to the H5TQ4G63CFR datasheet, the device is a 4Gb DDR3 SDRAM organized as 256M × 16

Key characteristics include:

• Memory density: 4Gb

• Organization: 256M × 16

• Memory type: DDR3 SDRAM

• Supply voltage: 1.5V

• Package: 96-ball FBGA

• Package size: 7.5 × 13 mm

• Internal banks: 8

• Data width: x16

Different suffixes identify speed and temperature variants.

Common speed grades include:

• H5TQ4G63CFR-H9 — DDR3-1333

• H5TQ4G63CFR-PB — DDR3-1600

• H5TQ4G63CFR-RD — DDR3-1866

• H5TQ4G63CFR-TE — DDR3-2133

Commercial and industrial-temperature versions are also available depending on the complete part-number suffix.

Is H5TQ4G63CFR Obsolete?

Some H5TQ4G63CFR variants are now listed as obsolete or discontinued in electronic component databases.

For equipment manufacturers maintaining long-lifecycle DDR3 platforms, this can create several sourcing challenges:

• Reduced availability from authorized channels

• Increasing dependence on remaining inventory

• Lot-to-lot sourcing uncertainty

• Higher risk of future component shortages

• Need for second-source qualification

For industrial systems expected to remain in production for many years, evaluating alternative DDR3 SDRAM devices before supply becomes critical can reduce future redesign risk.

For another legacy DDR3 sourcing case, see our MT41K128M16JT-125 DDR3L replacement guide

What Should Be Checked When Replacing H5TQ4G63CFR?

Matching memory density alone is not enough to determine DDR3 compatibility.

Before replacing H5TQ4G63CFR, engineers should compare:

• 1. Density and Organization

  A potential alternative should match the required 4Gb density and 256M × 16 organization.

• 2. Package and Pin Configuration

  H5TQ4G63CFR uses a 96-ball FBGA package.

  A replacement should be evaluated not only for package dimensions but also for the complete ball assignment and PCB footprint.

• 3. Supply Voltage

  H5TQ4G63CFR is a standard 1.5V DDR3 device.

  Voltage compatibility must therefore be verified carefully when considering DDR3L or dual-voltage alternatives.

• 4. Speed and Timing

  H5TQ4G63CFR is available in several speed grades ranging from DDR3-1333 to DDR3-2133.

  The replacement device must support the timing requirements of the existing memory controller and system design.

• 5. Operating Temperature

  For industrial applications, the complete H5TQ4G63CFR suffix should be checked to determine the original device's temperature grade.

  Replacement memory should then be qualified for the actual operating environment of the system.

  You can also review our MT41K256M16HA-125 replacement guide for another 4Gb DDR3L cross-reference example

Evaluating NexDie PRB4G1646D as an Alternative

NexDie PRB4G1646D is a 4Gb DDR3/DDR3L SDRAM with a 256M × 16 organization and 96-ball 7.5 × 13 mm BGA package.

These core characteristics make PRB4G1646D relevant for engineers evaluating alternatives to legacy 4Gb x16 DDR3 devices such as the H5TQ4G63CFR family.

However, compatibility should be evaluated against the exact H5TQ4G63CFR suffix and system requirements, including:

• Supply voltage

• Ball assignment

• Speed grade

• AC timing

• Temperature requirements

A system-level validation is recommended before production qualification

H5TQ4G63CFR Datasheet and Specification Check

If your existing design uses SK hynix H5TQ4G63CFR, H5TQ4G63CFR-RDC, H5TQ4G63CFR-RDI, or another variant, send us the complete part number and your operating requirements.

For a Samsung DDR3L reference, see our K4B4G1646E DDR3L specifications and replacement guide

FQA

1. What is H5TQ4G63CFR?

H5TQ4G63CFR is a 4Gb DDR3 SDRAM from SK hynix, organized as 256M × 16 and available in a 96-ball FBGA package. Different suffixes identify speed and temperature variants.

2. Is H5TQ4G63CFR obsolete?

Some H5TQ4G63CFR variants are listed as obsolete or discontinued by component databases. Availability should be checked using the complete part number and suffix.

3. What is the difference between H5TQ4G63CFR-RDC and H5TQ4G63CFR-RDI?

Both belong to the H5TQ4G63CFR family, but the suffix identifies different operating-temperature specifications. The RDC version is commercial-temperature, while RDI identifies an industrial-temperature version.

4. What should I check when replacing H5TQ4G63CFR?

Check memory density, 256M × 16 organization, package and pinout, supply voltage, speed grade, AC timing, and operating temperature. Matching only the 4Gb capacity is not sufficient.

5. Can NexDie PRB4G1646D replace H5TQ4G63CFR?

PRB4G1646D shares several core characteristics with H5TQ4G63CFR, including 4Gb density, 256M × 16 organization, and a 96-ball package. Compatibility should be verified against the exact H5TQ4G63CFR suffix, voltage, timing, pinout, and system requirements before qualification