AX7PAF1-161.132812C Equivalent & Substitute Parts

Part Overview

The AX7PAF1-161.132812C is a 161.13281 MHz XO (Standard) LVPECL oscillator manufactured by Abracon LLC, designed for applications requiring precise frequency generation at 3.3V supply voltage with Enable/Disable functionality. This crystal-based oscillator operates across the industrial temperature range of -40°C to 85°C with ±25ppm frequency stability.

The AX7PAF1-161.132812C has been discontinued at DiGi Electronics. Equivalent substitute parts are available from SiTime, utilizing MEMS resonator technology while maintaining identical electrical specifications and form factor compatibility.

Key Parameters

Parameter	Value
Frequency	161.13281 MHz
Output Type	LVPECL
Supply Voltage	3.3V
Function	Enable/Disable
Frequency Stability	±25ppm
Operating Temperature Range	-40°C to 85°C
Mounting Type	Surface Mount
Physical Dimensions	7.00mm L x 5.00mm W
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the AX7PAF1-161.132812C is based on the following critical parameters that must remain constant:

Frequency: 161.13281 MHz (exact match required)
Output Standard: LVPECL (electrical compatibility)
Supply Voltage: 3.3V (circuit compatibility)
Enable/Disable Function: Required for power management
Frequency Stability: ±25ppm (timing accuracy)
Operating Temperature: -40°C to 85°C (environmental compatibility)
Physical Footprint: 7.00mm x 5.00mm (PCB layout compatibility)
RoHS3 Compliance: Regulatory requirement

The SiTime SiT9121 series parts meet all these criteria. The primary difference is the resonator technology (MEMS vs. crystal) and package configuration (6-SMD vs. 8-SMD), which do not affect electrical compatibility or functional performance.

Parameter Comparison

Parameter	AX7PAF1-161.132812C (Abracon)	SIT9121AI-1D2-33E161.132810T (SiTime)	SIT9121AI-1D2-33E161.132810Y (SiTime)
Manufacturer	Abracon LLC	SiTime	SiTime
Frequency	161.13281 MHz	161.13281 MHz	161.13281 MHz
Output Type	LVPECL	LVPECL	LVPECL
Supply Voltage	3.3V	3.3V	3.3V
Function	Enable/Disable	Enable/Disable	Enable/Disable
Frequency Stability	±25ppm	±25ppm	±25ppm
Operating Temperature	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C
Current - Supply (Max)	94mA	69mA	69mA
Current - Supply (Disable) (Max)	86mA	35mA	35mA
Package / Case	8-SMD, No Lead	6-SMD, No Lead	6-SMD, No Lead
Physical Dimensions	7.00mm L x 5.00mm W	7.00mm L x 5.00mm W	7.00mm L x 5.00mm W
Height - Seated (Max)	1.90mm	1.00mm	1.00mm
Product Status	Discontinued at DiGi Electronics	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Both SiTime SiT9121 variants are direct functional equivalents for the discontinued AX7PAF1-161.132812C. Selection between the two SiTime options should be based on packaging requirements:

SIT9121AI-1D2-33E161.132810T and SIT9121AI-1D2-33E161.132810Y are electrically and functionally identical, with the primary distinction being packaging format (both supplied in Tape & Reel).

The SiTime substitutes offer operational advantages including reduced supply current (69mA vs. 94mA at maximum) and significantly lower disable-mode current consumption (35mA vs. 86mA), resulting in improved power efficiency. The reduced package height (1.00mm vs. 1.90mm) may provide additional PCB layout flexibility.

Both substitute parts maintain full compliance with ROHS3 and REACH regulations, with identical moisture sensitivity ratings and ECCN/HTSUS classifications as the original part.

Frequently Asked Questions (FAQ)

Q: Can SIT9121AI-1D2-33E161.132810T and SIT9121AI-1D2-33E161.132810Y be used interchangeably with AX7PAF1-161.132812C?

A: Yes. Both SiTime parts are electrically and functionally equivalent. They provide identical frequency output (161.13281 MHz), LVPECL signal levels, 3.3V supply compatibility, and Enable/Disable control. The physical footprint (7.00mm x 5.00mm) matches the original part, ensuring PCB compatibility.

Q: What is the difference between the two SiTime substitute parts?

A: SIT9121AI-1D2-33E161.132810T and SIT9121AI-1D2-33E161.132810Y are electrically identical. The suffix designates different packaging or date code variants. Both are supplied in Tape & Reel format and are functionally interchangeable.

Q: Are there any performance differences between the crystal-based AX7PAF1 and the MEMS-based SiT9121?

A: Both parts meet the same frequency stability specification (±25ppm) and operating temperature range (-40°C to 85°C). The SiTime MEMS oscillators provide lower power consumption and reduced package height. Electrical output characteristics (LVPECL) and timing performance are equivalent.

Q: Will the SiTime substitutes fit the existing PCB layout?

A: Yes. The SiTime parts maintain the same 7.00mm x 5.00mm footprint as the original AX7PAF1. The reduced height (1.00mm vs. 1.90mm) provides additional clearance and may improve assembly reliability.

Q: Are the substitute parts RoHS and REACH compliant?

A: Yes. Both SIT9121AI-1D2-33E161.132810T and SIT9121AI-1D2-33E161.132810Y are ROHS3 compliant and REACH unaffected, matching the regulatory status of the original part.

Q: What is the package difference between 8-SMD and 6-SMD?

A: The AX7PAF1 uses an 8-SMD package, while the SiTime substitutes use a 6-SMD package. Both are surface-mount, no-lead configurations with identical external dimensions. The 6-SMD configuration reflects the MEMS oscillator architecture and does not affect PCB compatibility or electrical performance.

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