AT25DF161-SH-B Equivalent & Substitute Parts

Part Overview

The AT25DF161-SH-B 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, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations.

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

Substitution eligibility for the AT25DF161-SH-B is determined by the following critical parameters:

Memory Capacity: 16Mbit (2M x 8 organization)
Package Type: 8-SOIC form factor with identical 5.30mm width
Interface Protocol: SPI compatibility
Supply Voltage: 2.7V ~ 3.6V operating range
Pin Configuration: Mechanical and electrical compatibility within 8-SOIC package

The identified substitute parts maintain these core parameters while operating within acceptable performance envelopes for the application category. Variations in clock frequency, write cycle time, and operating temperature ranges are permissible provided the substitute meets or exceeds the minimum functional requirements of the original specification.

Parameter Comparison

Parameter	AT25DF161-SH-B (Main)	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	8-SOIC	8-SOIC
Write Cycle Time - Page	3ms	10µs	3ms
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

SST25VF016B-50-4C-S2AF-T: This substitute maintains identical supply voltage and package specifications. The reduced clock frequency of 50 MHz is acceptable for applications where the original 100 MHz specification is not a critical requirement. The device is Active status with ROHS3 compliance. Moisture sensitivity level MSL-3 requires controlled storage conditions (168-hour limit after package opening).

W25Q16JVSSIQ: This substitute provides enhanced performance with 133 MHz clock frequency and maintains the full operating temperature range (-40°C to 85°C) matching the original device. The SPI - Quad I/O interface offers backward compatibility with standard SPI operation while enabling higher-speed quad mode when supported by the host controller. The device is Active status with ROHS3 compliance. Moisture sensitivity level MSL-3 requires controlled storage conditions.

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-B in all applications?

A: SST25VF016B-50-4C-S2AF-T is suitable for applications where 50 MHz clock frequency meets system requirements. The reduced frequency compared to the original 100 MHz specification may impact data throughput. Operating temperature range is limited to 0°C ~ 70°C, which is narrower than the original -40°C ~ 85°C range.

Q: What is the advantage of W25Q16JVSSIQ over the original AT25DF161-SH-B?

A: W25Q16JVSSIQ operates at 133 MHz, exceeding the original 100 MHz specification, and maintains the full -40°C ~ 85°C operating temperature range. The SPI - Quad I/O interface provides backward compatibility with standard SPI while enabling quad I/O mode for enhanced performance when the host controller supports this feature.

Q: Are both substitutes pin-compatible with the original device?

A: Both substitutes use the 8-SOIC package with identical 5.30mm width. Pin compatibility for SPI interface signals (MOSI, MISO, CLK, CS) is maintained. Verification of complete pinout compatibility with the specific application circuit is required before implementation.

Q: What storage conditions apply to the substitute parts?

A: SST25VF016B-50-4C-S2AF-T and W25Q16JVSSIQ both have Moisture Sensitivity Level MSL-3, requiring storage at controlled humidity (168-hour limit after package opening). The original AT25DF161-SH-B has MSL-1 (unlimited storage), indicating less stringent moisture control requirements.

Q: Are regulatory certifications equivalent between the main part and substitutes?

A: All three parts are ROHS3 compliant and REACH unaffected, meeting equivalent regulatory standards for hazardous substance restrictions and environmental compliance.

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