Part A
70V659S12DRGI
美國瑞薩電子公司
- Lifecycle
- Active
- Stock
- 1522 件
- Package
- PQFP-208
- Series
- 記憶力
Replacement verdict
Compatible functional replacement candidate
The 70V659S12DRGI and 70V657S12DRI are both 3.3V synchronous dual-port SRAM devices from the same family with matching 12 ns access time, 3.3V supply, and 208-ball BGA footprint, making them strong functional replacement candidates. The primary distinction is memory density, so the 70V657S12DRI can substitute for the 70V659S12DRGI only when the reduced on-chip capacity is acceptable for the target design.
Memory Density
Not compatible
Access Time
High match
Supply Voltage
High match
Package Type
High match
Parts at a glance
Part B
70V657S12DRI
美國瑞薩電子公司
- Lifecycle
- Active
- Stock
- 7421 件
- Package
- BFQFP-208
- Series
- 記憶力
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 70V659S12DRGI | 70V657S12DRI | Why it matters |
|---|---|---|---|
| Memory Organization | 128K x 36 | 32K x 36 | Determines total storage capacity and addressable word depth; a smaller organization cannot directly substitute for a larger one without firmware/address changes. |
| Total Memory Density | 4 Mbit | 1 Mbit | Overall capacity affects whether the device can hold the required data set; mismatched density prevents drop-in functional replacement. |
| Access Time | 12 ns | 12 ns | Speed grade must match the system timing budget; identical access time means no timing penalty when swapping. |
| Supply Voltage | 3.3 V | 3.3 V | Core and I/O voltage must be compatible with the host system rails to avoid level-shifting or damage. |
| Memory Type | SRAM (Dual-Port) | SRAM (Dual-Port) | Device technology and interface type must match for the part to be functionally interchangeable in the target socket. |
| Package / Mounting | Surface Mount | Surface Mount | Footprint and mounting style must be compatible with the PCB land pattern for physical assembly. |
| Operating Temperature Range | Industrial (-40°C to +85°C) | Industrial (-40°C to +85°C) | Thermal rating must meet the application environment to ensure reliable operation over the product lifetime. |
| Interface / Bus Width | 36-bit | 36-bit | Data bus width must match the host controller to allow direct connection without glue logic. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 70V659S12DRGI | 70V657S12DRI |
|---|---|---|
| Supplier | - | Renesas Electronics America Inc |
| Part Status | Active | Obsolete |
| Memory Type | Volatile | Volatile |
| Memory Format | SRAM | SRAM |
| Technology | SRAM - Dual Port, Asynchronous | SRAM - Dual Port, Asynchronous |
| Memory Size | 4.5Mb (128K x 36) | 1.125Mb (32K x 36) |
| Memory Interface | Parallel | Parallel |
| Write Cycle Time - Word Page | 12ns | 12ns |
| Access Time | 12 ns | 12 ns |
| Voltage - Supply | 3.15V ~ 3.45V | 3.15V ~ 3.45V |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the 70V659S12DRGI and 70V657S12DRI?
The 70V659S12DRGI and 70V657S12DRI are 3.3V synchronous dual-port SRAM devices from Renesas (formerly IDT) in the 70V65x family. Both are 128K x 36-bit dual-port SRAMs with 12 ns access time, packaged in a 208-pin PQFP (Plastic Quad Flat Pack).
What is the difference between the 70V659S12DRGI and 70V657S12DRI?
The primary difference is the operating temperature range. The 70V659S12DRGI is specified for the industrial temperature range (-40°C to +85°C), while the 70V657S12DRI is specified for the commercial temperature range (0°C to +70°C). Both share the same 128K x 36 organization, 12 ns speed grade, 3.3V supply, and 208-pin PQFP package.
Are the 70V659S12DRGI and 70V657S12DRI pin-compatible?
Yes. Both devices are offered in the same 208-pin PQFP package with identical pinouts, as defined in the Renesas 70V657/70V659 datasheet. This allows a common PCB footprint, but the temperature grade difference must still be validated for the target application.
Can the 70V657S12DRI be used as a drop-in replacement for the 70V659S12DRGI?
Functionally and pin-wise, the devices are compatible. However, the 70V657S12DRI is rated only for the commercial temperature range (0°C to +70°C), whereas the 70V659S12DRGI supports the industrial range (-40°C to +85°C). A drop-in replacement is acceptable only if the application's operating temperature remains within 0°C to +70°C and all other datasheet parameters are met.
What is the memory organization and density of these devices?
Both the 70V659S12DRGI and 70V657S12DRI provide 128K x 36 bits of dual-port SRAM, which equals 4 Megabits (4 Mbit) of total storage. They support simultaneous read/write access from two independent ports.
What is the access time and supply voltage for the 70V659S12DRGI and 70V657S12DRI?
Both devices have a 12 ns maximum access time (speed grade "12") and operate from a 3.3V power supply (3.3V ± 0.3V), as specified in the Renesas 70V657/70V659 datasheet.
Do the 70V659S12DRGI and 70V657S12DRI support battery backup or low-power standby?
Yes. Both devices include a battery backup mode and a low-power standby mode, allowing data retention at reduced supply voltage. Detailed current and voltage limits for these modes are provided in the Renesas 70V657/70V659 datasheet.
Which applications are suitable for the 70V659S12DRGI versus the 70V657S12DRI?
The 70V659S12DRGI (industrial temperature range) is suitable for industrial, automotive, and outdoor applications where ambient temperatures may reach -40°C to +85°C. The 70V657S12DRI (commercial temperature range) is intended for controlled-environment applications such as office equipment, consumer electronics, and standard commercial systems operating between 0°C and +70°C.