AT25DF161-SH-T Equivalent & Substitute Parts

Part Overview

The AT25DF161-SH-T is a 16Mbit Serial Peripheral Interface (SPI) FLASH memory IC manufactured by Microchip Technology, housed in an 8-SOIC surface mount package. This device operates at 100 MHz clock frequency with a supply voltage range of 2.7V to 3.6V and supports operating temperatures from -40°C to 85°C. The product is classified as Obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Memory Size	16Mbit
Memory Organization	2M x 8
Memory Interface	SPI
Clock Frequency	100 MHz
Voltage Supply Range	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.209", 5.30mm Width)
Write Cycle Time - Word, Page	7µs, 3ms
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the AT25DF161-SH-T are qualified based on the following critical parameters:

Memory Capacity: 16Mbit (2M x 8 organization)
Package Type: 8-SOIC surface mount with identical 5.30mm width
Memory Interface: SPI protocol compatibility
Supply Voltage: 2.7V ~ 3.6V operating range
Regulatory Compliance: ROHS3 Compliant status

The identified substitutes maintain these core electrical and mechanical specifications, ensuring functional compatibility within existing circuit designs. Variations in clock frequency, operating temperature range, and write cycle time are secondary parameters that may affect performance characteristics but do not preclude substitution when application requirements permit.

Parameter Comparison

Parameter	AT25DF161-SH-T	SST25VF016B-50-4C-S2AF-T	W25Q16JVSSIQ
Manufacturer	Microchip Technology	Microchip Technology	Winbond Electronics
Memory Size	16Mbit	16Mbit	16Mbit
Memory Organization	2M x 8	2M x 8	2M x 8
Memory Interface	SPI	SPI	SPI - Quad I/O
Clock Frequency	100 MHz	50 MHz	133 MHz
Voltage Supply Range	2.7V ~ 3.6V	2.7V ~ 3.6V	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C
Package / Case	8-SOIC (0.209", 5.30mm Width)	8-SOIC (0.209", 5.30mm Width)	8-SOIC (0.209", 5.30mm Width)
Write Cycle Time - Word, Page	7µs, 3ms	10µs	3ms
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

SST25VF016B-50-4C-S2AF-T: This Microchip Technology substitute maintains identical supply voltage and package specifications. The reduced clock frequency of 50 MHz and narrower operating temperature range (0°C ~ 70°C) require verification against application performance requirements. This part is Active status with ROHS3 compliance and is suitable for applications where the lower frequency specification is acceptable.

W25Q16JVSSIQ: This Winbond Electronics substitute provides the highest clock frequency at 133 MHz and matches the original operating temperature range of -40°C ~ 85°C. The SPI - Quad I/O interface offers extended functionality beyond standard SPI operation. This part maintains Active product status with ROHS3 compliance. The higher clock frequency and extended temperature range make this substitute suitable for performance-critical applications requiring the original thermal specifications.

Both substitutes are ROHS3 compliant and REACH unaffected, meeting regulatory requirements equivalent to the original part.

Frequently Asked Questions (FAQ)

Q: Can SST25VF016B-50-4C-S2AF-T replace AT25DF161-SH-T in all applications?

A: SST25VF016B-50-4C-S2AF-T is electrically and mechanically compatible for applications operating within 0°C to 70°C temperature range. Applications requiring the full -40°C to 85°C range or 100 MHz clock frequency operation require evaluation against specific design requirements.

Q: What is the primary advantage of W25Q16JVSSIQ as a substitute?

A: W25Q16JVSSIQ provides higher clock frequency (133 MHz) and maintains the full -40°C to 85°C operating temperature range of the original part. The SPI - Quad I/O interface enables higher data throughput when supported by the host controller.

Q: Are all three parts pin-compatible?

A: All three parts use the 8-SOIC package with identical 5.30mm width and pin configuration, ensuring direct mechanical and electrical pin compatibility.

Q: What is the impact of different Moisture Sensitivity Levels (MSL)?

A: The original AT25DF161-SH-T has MSL 1 (Unlimited shelf life). Substitutes with MSL 3 (168 Hours) require controlled storage conditions and have limited shelf life after moisture exposure. Storage and handling procedures must be adjusted accordingly.

Q: Can the Quad I/O capability of W25Q16JVSSIQ be ignored if only SPI mode is used?

A: Yes. W25Q16JVSSIQ operates in standard SPI mode when Quad I/O instructions are not invoked. The device is backward compatible with standard SPI protocol implementations.

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