AT25SF161-SSHD-B Equivalent & Substitute Parts

Part Overview

The AT25SF161-SSHD-B is a 16Mbit NOR Flash memory IC manufactured by Renesas Electronics Corporation, featuring SPI and Quad I/O interface capabilities. This component is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. The part is housed in an 8-SOIC surface mount package and operates across industrial temperature ranges (-40°C to 85°C).

Key Parameters

Parameter	Value
Memory Size	16Mbit
Memory Organization	2M x 8
Memory Interface	SPI - Quad I/O
Clock Frequency	104 MHz
Voltage Supply Range	2.5V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package Type	8-SOIC (0.154", 3.90mm Width)
Write Cycle Time (Word/Page)	5µs / 5ms
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the AT25SF161-SSHD-B is determined by the following critical parameters:

Memory capacity: 16Mbit (2M x 8 organization)
Interface protocol: SPI with Quad I/O capability
Package form factor: 8-SOIC with identical 3.90mm width
Supply voltage compatibility: Minimum 2.5V operation required
Temperature rating: -40°C to 85°C operational range
RoHS3 compliance and MSL rating compatibility

Substitute parts must maintain identical memory capacity, interface type, and physical package dimensions. Variations in clock frequency, write cycle timing, and voltage supply upper limits are permissible when the substitute part meets or exceeds the original specifications or maintains backward compatibility within the application's electrical constraints.

Parameter Comparison

Parameter	AT25SF161-SSHD-B (Main)	AT25SF161B-SSHB-B	AT25SF161B-SSHD-B	AT25FF161A-SSHN-B	W25Q16JVSNIQ
Manufacturer	Renesas	Renesas	Renesas	Renesas	Winbond
Memory Size	16Mbit	16Mbit	16Mbit	16Mbit	16Mbit
Memory Organization	2M x 8	2M x 8	2M x 8	2M x 8	2M x 8
Memory Interface	SPI - Quad I/O	SPI - Quad I/O	SPI - Quad I/O	SPI - Quad I/O	SPI - Quad I/O
Clock Frequency	104 MHz	108 MHz	108 MHz	133 MHz	133 MHz
Access Time	—	—	7 ns	—	—
Write Cycle Time (Word)	5µs	50µs	50µs	12µs	—
Write Cycle Time (Page)	5ms	2.4ms	1.8ms	8ms	3ms
Voltage Supply Range	2.5V ~ 3.6V	2.7V ~ 3.6V	2.5V ~ 3.6V	1.65V ~ 3.6V	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)

Engineering Selection Recommendations

AT25SF161B-SSHB-B and AT25SF161B-SSHD-B: Both parts are active Renesas alternatives with identical memory capacity and interface specifications. AT25SF161B-SSHD-B maintains the original 2.5V minimum supply voltage and provides 7 ns access time. Both offer improved page write performance (2.4ms and 1.8ms respectively) compared to the original 5ms specification. These parts are direct Renesas product line continuations with ROHS3 compliance and MSL-1 ratings.

AT25FF161A-SSHN-B: This Renesas part operates at 133 MHz clock frequency and supports extended low-voltage operation (1.65V minimum). It maintains ROHS3 compliance and MSL-1 rating. The higher clock frequency and lower voltage floor provide design flexibility for power-constrained applications.

W25Q16JVSNIQ: The Winbond SpiFlash® equivalent provides 133 MHz operation and is verified for DiGi-Electronics programmability. This part carries MSL-3 rating (168 hours) and requires 2.7V minimum supply voltage. Winbond parts offer the highest inventory availability (169,476 units in stock) and are suitable for applications where extended moisture sensitivity handling is acceptable.

Frequently Asked Questions (FAQ)

Q: Can AT25SF161B-SSHD-B directly replace AT25SF161-SSHD-B in existing designs?

A: Yes. Both parts share identical memory capacity (16Mbit), interface type (SPI - Quad I/O), package form factor (8-SOIC), and operating temperature range (-40°C to 85°C). The substitute maintains the 2.5V minimum supply voltage and provides equivalent or improved electrical performance.

Q: What is the primary difference between AT25SF161B-SSHB-B and AT25SF161B-SSHD-B?

A: Both are active Renesas parts with 108 MHz operation. AT25SF161B-SSHD-B specifies 7 ns access time and faster page write cycle (1.8ms vs. 2.4ms). AT25SF161B-SSHB-B requires 2.7V minimum supply voltage, while AT25SF161B-SSHD-B maintains 2.5V compatibility with the original part.

Q: Is W25Q16JVSNIQ suitable for applications requiring MSL-1 rating?

A: No. W25Q16JVSNIQ carries MSL-3 rating (168 hours maximum floor life), whereas the original AT25SF161-SSHD-B and Renesas alternatives (AT25SF161B series, AT25FF161A-SSHN-B) all carry MSL-1 (unlimited) ratings. Applications with strict moisture sensitivity requirements must use Renesas alternatives.

Q: What voltage supply range must be maintained for all substitutes?

A: The original part operates at 2.5V to 3.6V. AT25SF161B-SSHD-B and AT25FF161A-SSHN-B maintain 2.5V minimum compatibility. AT25SF161B-SSHB-B and W25Q16JVSNIQ require 2.7V minimum. Designs operating below 2.7V must use AT25SF161B-SSHD-B or AT25FF161A-SSHN-B.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (AT25SF161B-SSHB-B, AT25SF161B-SSHD-B, AT25FF161A-SSHN-B, and W25Q16JVSNIQ) are ROHS3 compliant and suitable for applications requiring RoHS certification.

Q: Which substitute offers the highest clock frequency?

A: Both AT25FF161A-SSHN-B and W25Q16JVSNIQ operate at 133 MHz, compared to the original part's 104 MHz. These parts provide improved data throughput for bandwidth-sensitive applications.

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