AT25160B-TH-B Equivalent & Substitute Parts

Part Overview

The AT25160B-TH-B is a 16Kbit EEPROM memory IC with SPI interface manufactured by Microchip Technology. This device operates at 20 MHz clock frequency with 8-TSSOP surface mount packaging. The part is currently obsolete, necessitating identification of functionally equivalent alternatives from active product lines. Substitute parts must maintain compatibility across memory capacity, interface protocol, electrical specifications, and physical packaging to ensure seamless integration into existing designs.

Key Parameters

Parameter	Value
Memory Size	16Kbit
Memory Organization	2K x 8
Memory Interface	SPI
Clock Frequency	20 MHz
Write Cycle Time	5ms
Voltage Supply Range	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following parameters:

Primary Compatibility Criteria:

Memory Size: 16Kbit (mandatory)
Memory Organization: 2K x 8 (mandatory)
Memory Interface: SPI (mandatory)
Package Type: 8-TSSOP (mandatory)
Voltage Supply Range: 1.8V ~ 5.5V (mandatory)
Operating Temperature: -40°C minimum and 85°C maximum (mandatory)
RoHS Status: ROHS3 Compliant (mandatory)

Secondary Compatibility Criteria:

Clock Frequency: 20 MHz or higher (acceptable if equal or greater)
Write Cycle Time: 5ms or faster (acceptable if equal or faster)
Mounting Type: Surface Mount (mandatory)

Substitute parts are grouped into two categories based on clock frequency alignment:

Category 1 - Direct Frequency Match (20 MHz): Parts operating at 20 MHz provide identical performance characteristics to the original AT25160B-TH-B.

Category 2 - Lower Frequency (10 MHz): Parts operating at 10 MHz are functionally compatible but operate at reduced clock speed. These are suitable for applications where maximum clock frequency is not a design constraint.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Write Cycle Time	Voltage Supply	Operating Temperature	Package	Product Status
AT25160B-TH-B	Microchip Technology	16Kbit	20 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Obsolete
25AA160A-I/ST	Microchip Technology	16Kbit	10 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
25AA160B-I/ST	Microchip Technology	16Kbit	10 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
25AA160C-I/ST	Microchip Technology	16Kbit	10 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
25AA160D-E/ST	Microchip Technology	16Kbit	10 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
25AA160D-I/ST	Microchip Technology	16Kbit	10 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
25AA160DT-E/ST	Microchip Technology	16Kbit	10 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
AT25160B-XHL-B	Microchip Technology	16Kbit	20 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
BR25H160FVT-2CE2	Rohm Semiconductor	16Kbit	10 MHz	4ms	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
CAT25160YI-GT3	onsemi	16Kbit	20 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
CAT25160YI-GT3JN	onsemi	16Kbit	20 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active

Engineering Selection Recommendations

Primary Recommendation - Direct Replacement (20 MHz):

AT25160B-XHL-B is the preferred substitute. This Microchip Technology part maintains identical electrical and timing specifications to the obsolete AT25160B-TH-B, including 20 MHz clock frequency and 5ms write cycle time. The part is in active production status with ROHS3 compliance and 4300 units in stock. Packaging is 8-TSSOP in tube format.

CAT25160YI-GT3 and CAT25160YI-GT3JN from onsemi provide equivalent performance as alternative 20 MHz sources. Both maintain the same voltage supply range, operating temperature, and package specifications. CAT25160YI-GT3 is available in Tape & Reel format with 3090 units in stock, while CAT25160YI-GT3JN offers 1040 units in stock.

Secondary Recommendation - Lower Frequency Alternatives (10 MHz):

The 25AA160 series from Microchip Technology (25AA160A-I/ST, 25AA160B-I/ST, 25AA160C-I/ST, 25AA160D-I/ST) are functionally compatible substitutes operating at 10 MHz. These parts are suitable for applications where clock frequency is not a limiting design factor. All maintain the same 16Kbit capacity, 2K x 8 organization, SPI interface, and 8-TSSOP packaging. Extended temperature variants (25AA160D-E/ST and 25AA160DT-E/ST) support -40°C to 125°C operation.

BR25H160FVT-2CE2 from Rohm Semiconductor is an automotive-grade alternative with AEC-Q100 qualification. This part operates at 10 MHz with 4ms write cycle time and supports extended temperature range (-40°C to 125°C). Voltage supply range is 2.5V to 5.5V, which is narrower than the original specification.

Compliance and Availability:

All recommended substitutes maintain ROHS3 compliance and are in active production. Selection should prioritize clock frequency alignment with original design specifications and application temperature requirements.

Frequently Asked Questions (FAQ)

Q: Can I use a 10 MHz part as a direct replacement for the 20 MHz AT25160B-TH-B?

A: Yes, 10 MHz parts are functionally compatible from an electrical and mechanical standpoint. The lower clock frequency will not cause functional failure. However, if your application requires 20 MHz operation for timing-critical operations, use AT25160B-XHL-B or CAT25160YI-GT3 instead.

Q: What is the difference between tube and tape & reel packaging?

A: Tube packaging is suitable for manual assembly and small-volume production. Tape & Reel format is optimized for automated pick-and-place assembly equipment. Both formats contain identical die and electrical specifications. Select based on your assembly process requirements.

Q: Are the 25AA160 series parts pin-compatible with AT25160B-TH-B?

A: Yes. All parts use 8-TSSOP packaging with identical pinout. The SPI interface protocol is consistent across all substitutes, ensuring software and firmware compatibility.

Q: Why does BR25H160FVT-2CE2 have a narrower voltage supply range?

A: BR25H160FVT-2CE2 is an automotive-grade component with AEC-Q100 qualification. The 2.5V to 5.5V range is typical for automotive EEPROM devices. This part is suitable only if your application operates within this voltage window.

Q: What is the significance of the extended temperature rating on 25AA160D-E/ST and 25AA160DT-E/ST?

A: These parts support -40°C to 125°C operation, compared to -40°C to 85°C for standard variants. Extended temperature rating is required for industrial and automotive applications operating in high-temperature environments. Use standard temperature parts for consumer and commercial applications operating within -40°C to 85°C.

Q: Is there a performance difference between CAT25160YI-GT3 and CAT25160YI-GT3JN?

A: Both parts have identical electrical specifications. The difference is in packaging format: CAT25160YI-GT3 is supplied in Tape & Reel, while CAT25160YI-GT3JN is supplied in standard packaging. Select based on your assembly process requirements.

Q: Can I mix different manufacturers' parts in the same design?

A: Yes. All recommended substitutes maintain identical SPI protocol, pinout, and electrical specifications. Cross-manufacturer substitution is supported from an engineering standpoint. Verify with your supply chain and quality assurance processes for any internal requirements.

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