AT25DQ161-SH-T Equivalent & Substitute Parts

Part Overview

The AT25DQ161-SH-T is a 16Mbit FLASH memory IC with SPI interface manufactured by Microchip Technology. This device is classified as Obsolete, making substitute parts necessary for new designs and ongoing production requirements. The part operates at 100 MHz clock frequency with a supply voltage range of 2.7V to 3.6V and is housed in an 8-SOIC surface mount package. Identification of compatible alternatives ensures design continuity and supply chain flexibility.

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
Package / Case	8-SOIC (0.209", 5.30mm Width)
Operating Temperature	-40°C ~ 85°C (TC)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the AT25DQ161-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
Supply Voltage: 2.7V ~ 3.6V compatibility
Memory Interface: SPI protocol support
Compliance: ROHS3 compliance and EAR99 classification

The identified substitutes meet these core electrical and mechanical requirements. Variations in clock frequency, write cycle time, and operating temperature ranges are documented but do not preclude functional substitution within appropriate application parameters.

Parameter Comparison

Parameter	AT25DQ161-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	2.7V ~ 3.6V	2.7V ~ 3.6V	2.7V ~ 3.6V
Package / Case	8-SOIC (0.209", 5.30mm Width)	8-SOIC (0.209", 5.30mm Width)	8-SOIC (0.209", 5.30mm Width)
Operating Temperature	-40°C ~ 85°C (TC)	0°C ~ 70°C (TA)	-40°C ~ 85°C (TA)
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

SST25VF016B-50-4C-S2AF-T: This Microchip Technology part maintains identical memory capacity, organization, and package specifications. Clock frequency is reduced to 50 MHz compared to the original 100 MHz specification. Operating temperature range is narrower (0°C ~ 70°C). Product status is Active with verified DiGi-Electronics programmability. This substitute is suitable for applications where the reduced clock frequency and narrower temperature range are acceptable.

W25Q16JVSSIQ: This Winbond Electronics part provides 16Mbit capacity in the same 8-SOIC package with extended clock frequency capability (133 MHz). The memory interface supports SPI with Quad I/O capability, offering enhanced performance potential. Operating temperature range matches the original specification (-40°C ~ 85°C). Product status is Active with verified programmability. This substitute is suitable for applications requiring higher performance or extended temperature operation.

Frequently Asked Questions (FAQ)

Q: Can the SST25VF016B-50-4C-S2AF-T be used as a direct replacement for the AT25DQ161-SH-T?

A: The SST25VF016B-50-4C-S2AF-T shares identical memory capacity, organization, supply voltage, and package specifications. The primary difference is reduced clock frequency (50 MHz versus 100 MHz) and a narrower operating temperature range (0°C ~ 70°C versus -40°C ~ 85°C). Substitution is valid when application timing requirements do not exceed 50 MHz and operating conditions remain within 0°C ~ 70°C.

Q: What is the advantage of the W25Q16JVSSIQ over the original AT25DQ161-SH-T?

A: The W25Q16JVSSIQ operates at 133 MHz clock frequency, exceeding the original 100 MHz specification. It supports SPI with Quad I/O interface, enabling higher data throughput. Operating temperature range matches the original (-40°C ~ 85°C). This part is suitable for designs requiring enhanced performance within the same thermal envelope.

Q: Are all three parts pin-compatible?

A: All three parts use the 8-SOIC package with identical 5.30mm width. Pin compatibility for SPI interface signals is maintained across all substitutes. The W25Q16JVSSIQ includes additional Quad I/O pins that may not be utilized in standard SPI mode, but this does not prevent functional operation in SPI-only applications.

Q: What compliance certifications apply to these parts?

A: All three parts are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export control purposes. Moisture sensitivity levels vary: AT25DQ161-SH-T (MSL 1), SST25VF016B-50-4C-S2AF-T (MSL 3), and W25Q16JVSSIQ (MSL 3).

Q: Why is the AT25DQ161-SH-T marked as Obsolete?

A: Obsolete status indicates the part is no longer in active production. The identified substitutes with Active status provide equivalent or enhanced functionality and ensure continued availability for new designs and production requirements.

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