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AT26DF161A-SU Equivalent & Substitute Parts
Part Overview
The AT26DF161A-SU is a 16Mbit SPI FLASH memory IC manufactured by Microchip Technology, packaged in 8-SOIC form factor. This device operates at 70 MHz clock frequency with a supply voltage range of 2.7V to 3.6V and is rated for -40°C to 85°C operating temperature. The part is currently obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Memory Size | 16Mbit |
| Memory Format | FLASH |
| Memory Interface | SPI |
| Clock Frequency | 70 MHz |
| Voltage Supply Range | 2.7V ~ 3.6V |
| Operating Temperature | -40°C ~ 85°C |
| Package / Case | 8-SOIC (0.209", 5.30mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution of the AT26DF161A-SU is determined by the following critical parameters:
- Memory Capacity: 16Mbit (fixed requirement)
- Memory Type: Non-Volatile FLASH
- Interface Protocol: SPI (Serial Peripheral Interface)
- Package: 8-SOIC form factor with identical 5.30mm width
- Supply Voltage Compatibility: 2.7V ~ 3.6V range
- Operating Temperature Range: Must support -40°C ~ 85°C or equivalent industrial range
- RoHS Compliance: ROHS3 Compliant
The substitute parts listed maintain identical memory capacity, package form factor, and voltage supply specifications. Clock frequency variations are acceptable provided the substitute operates at or above the minimum SPI interface requirements of the application. All substitutes are active products with verified programmability status.
Parameter Comparison
| Parameter | AT26DF161A-SU | SST25VF016B-50-4C-S2AF | SST25VF016B-50-4C-S2AF-T | SST25VF016B-50-4I-S2AF | W25Q16JVSSIQ |
|---|---|---|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Winbond Electronics |
| Memory Size | 16Mbit | 16Mbit | 16Mbit | 16Mbit | 16Mbit |
| Memory Format | FLASH | FLASH | FLASH | FLASH | FLASH - NOR |
| Memory Interface | SPI | SPI | SPI | SPI | SPI - Quad I/O |
| Clock Frequency | 70 MHz | 50 MHz | 50 MHz | 50 MHz | 133 MHz |
| Voltage Supply | 2.7V ~ 3.6V | 2.7V ~ 3.6V | 2.7V ~ 3.6V | 2.7V ~ 3.6V | 2.7V ~ 3.6V |
| Operating Temperature | -40°C ~ 85°C | 0°C ~ 70°C | 0°C ~ 70°C | -40°C ~ 85°C | -40°C ~ 85°C |
| Package / Case | 8-SOIC (0.209", 5.30mm) | 8-SOIC (0.209", 5.30mm) | 8-SOIC (0.209", 5.30mm) | 8-SOIC (0.209", 5.30mm) | 8-SOIC (0.209", 5.30mm) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Product Status | Obsolete | Active | Active | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
All listed substitute parts are active products with verified programmability status and ROHS3 compliance, making them suitable for production use.
SST25VF016B Series (Microchip Technology): The three SST25VF016B variants maintain Microchip Technology manufacturer continuity. SST25VF016B-50-4I-S2AF is the preferred option within this series as it supports the full -40°C to 85°C operating temperature range matching the original AT26DF161A-SU specification. The SST25VF016B-50-4C variants are limited to 0°C to 70°C and should be selected only for applications with restricted temperature requirements. Clock frequency is reduced to 50 MHz compared to the original 70 MHz specification.
W25Q16JVSSIQ (Winbond Electronics): This substitute offers the highest clock frequency at 133 MHz and supports the full -40°C to 85°C operating temperature range. The SPI - Quad I/O interface provides extended functionality beyond standard SPI operation. This part is suitable for applications requiring higher performance or quad I/O capability.
Frequently Asked Questions (FAQ)
Q: Can SST25VF016B-50-4C-S2AF be used in applications requiring -40°C operation?
A: No. SST25VF016B-50-4C-S2AF is rated for 0°C to 70°C operating temperature only. For applications requiring -40°C to 85°C operation, use SST25VF016B-50-4I-S2AF or W25Q16JVSSIQ.
Q: What is the difference between SST25VF016B-50-4C-S2AF and SST25VF016B-50-4C-S2AF-T?
A: Both parts are electrically identical with 50 MHz clock frequency and 0°C to 70°C operating temperature. The difference is packaging: SST25VF016B-50-4C-S2AF is supplied in Tube, while SST25VF016B-50-4C-S2AF-T is supplied in Cut Tape (CT) & Digi-Reel format.
Q: Is the W25Q16JVSSIQ backward compatible with AT26DF161A-SU?
A: The W25Q16JVSSIQ maintains SPI interface compatibility and identical 8-SOIC package form factor. The Quad I/O capability is an extended feature that does not affect standard SPI operation. Voltage supply and operating temperature ranges are compatible.
Q: Why is the clock frequency lower on SST25VF016B substitutes compared to AT26DF161A-SU?
A: SST25VF016B series operates at 50 MHz maximum clock frequency, compared to 70 MHz for AT26DF161A-SU. This is a specification difference between product families. Applications must verify that 50 MHz operation meets system timing requirements.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All listed substitute parts are ROHS3 Compliant and suitable for applications with RoHS compliance requirements.
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