TRF3761-DIRHAT Integer-N Synthesizer/VCO IC Equivalent & Substitute Parts

Part Overview

The TRF3761-DIRHAT is an Integer-N Synthesizer/VCO IC manufactured by Texas Instruments, designed for clock/timing applications with a maximum frequency of 1.87GHz. This component integrates a phase-locked loop (PLL) with programmable frequency synthesis in a 40-VFQFN exposed pad surface mount package.

The TRF3761-DIRHAT is classified as obsolete. Substitute parts from the same TRF3761 base product family are available with active product status, making them suitable alternatives for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Clock/Timing
Type	Integer-N Synthesizer/VCO
Package / Case	40-VFQFN Exposed Pad
Supplier Device Package	40-VQFN (6x6)
Mounting Type	Surface Mount
Voltage - Supply	4.5V ~ 5.25V
Operating Temperature	-40°C ~ 85°C
PLL	Yes
Input / Output	Clock / Clock
Number of Circuits	1
Ratio - Input:Output	1:1
Differential - Input:Output	No/Yes
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitute parts within the TRF3761 base product family are qualified as parametric equivalents based on the following criteria:

Electrical Compatibility Parameters:

Voltage supply range: 4.5V ~ 5.25V (identical across all variants)
Operating temperature range: -40°C ~ 85°C (identical across all variants)
PLL functionality: Present in all variants
Input/Output configuration: Clock input, Clock output (identical across all variants)
Input:Output ratio: 1:1 (identical across all variants)
Differential input/output: No/Yes (identical across all variants)

Mechanical Compatibility Parameters:

Package type: 40-VFQFN Exposed Pad (identical across all variants)
Supplier device package: 40-VQFN (6x6) (identical across all variants)
Mounting type: Surface Mount (identical across all variants)

Regulatory & Compliance Parameters:

RoHS Status: ROHS3 Compliant (identical across all variants)
Moisture Sensitivity Level: 3 (168 Hours) (identical across all variants)
REACH Status: REACH Unaffected (identical across all variants)

Variable Parameter:

Frequency - Max: Ranges from 1.6GHz to 1.87GHz across variants

The primary differentiator among substitute parts is the maximum frequency specification. Selection depends on application frequency requirements within the specified range.

Parameter Comparison

Part Number	Manufacturer	Product Status	Frequency - Max	Package / Case	Voltage - Supply	Operating Temperature	Inventory (Pcs)
TRF3761-DIRHAT	Texas Instruments	Obsolete	1.87GHz	40-VFQFN Exposed Pad	4.5V ~ 5.25V	-40°C ~ 85°C	1639
TRF3761-AIRHAR	Texas Instruments	Active	1.6GHz	40-VFQFN Exposed Pad	4.5V ~ 5.25V	-40°C ~ 85°C	1096
TRF3761-AIRHAT	Texas Instruments	Active	1.6GHz	40-VFQFN Exposed Pad	4.5V ~ 5.25V	-40°C ~ 85°C	1108
TRF3761-BIRHAT	Texas Instruments	Active	1.71GHz	40-VFQFN Exposed Pad	4.5V ~ 5.25V	-40°C ~ 85°C	1284
TRF3761-CIRHAT	Texas Instruments	Active	1.79GHz	40-VFQFN Exposed Pad	4.5V ~ 5.25V	-40°C ~ 85°C	833

Engineering Selection Recommendations

All substitute parts maintain identical electrical and mechanical specifications with the exception of maximum frequency rating. Selection criteria are based on product status and application frequency requirements:

For applications requiring maximum frequency of 1.87GHz: The TRF3761-DIRHAT remains available with 1639 units in stock, though classified as obsolete. No active substitute provides equivalent maximum frequency.

For applications with frequency requirements up to 1.79GHz: TRF3761-CIRHAT (Active status, 1.79GHz maximum) is the highest-frequency active substitute with 833 units in stock.

For applications with frequency requirements up to 1.71GHz: TRF3761-BIRHAT (Active status, 1.71GHz maximum) provides 1284 units in stock.

For applications with frequency requirements up to 1.6GHz: TRF3761-AIRHAT or TRF3761-AIRHAR (both Active status, 1.6GHz maximum) are available with 1108 and 1096 units respectively.

All substitute parts carry ROHS3 compliance, REACH unaffected status, and identical MSL ratings, ensuring regulatory and environmental compatibility with the original specification.

Frequently Asked Questions (FAQ)

Q: Can TRF3761-AIRHAT substitute for TRF3761-DIRHAT in all applications?

A: TRF3761-AIRHAT is mechanically and electrically compatible with TRF3761-DIRHAT in all parameters except maximum frequency. TRF3761-AIRHAT supports frequencies up to 1.6GHz, while TRF3761-DIRHAT supports up to 1.87GHz. Substitution is valid only if your application operates within the 1.6GHz maximum frequency limit.

Q: What is the difference between TRF3761-AIRHAT and TRF3761-AIRHAR?

A: Both parts are parametrically identical with 1.6GHz maximum frequency. The primary difference is packaging: TRF3761-AIRHAT and TRF3761-AIRHAR are both supplied in Tape & Reel format. Inventory levels differ slightly (1108 vs 1096 units respectively).

Q: Are all substitute parts pin-compatible with the original TRF3761-DIRHAT?

A: Yes. All substitute parts use the identical 40-VFQFN Exposed Pad package in 6x6mm configuration with surface mount mounting type, ensuring direct pin compatibility.

Q: Do substitute parts meet the same compliance requirements?

A: Yes. All substitute parts maintain ROHS3 compliance, REACH unaffected status, and identical Moisture Sensitivity Level (MSL) 3 rating (168 Hours), matching the original specification.

Q: Which substitute part should I select if my application requires the highest frequency?

A: TRF3761-CIRHAT provides the highest maximum frequency among active substitutes at 1.79GHz. If your application requires frequencies above 1.79GHz, the obsolete TRF3761-DIRHAT at 1.87GHz remains the only option within this product family.

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