AT-37.050MAGV-T Crystal Oscillator Equivalent & Substitute Parts

Part Overview

The AT-37.050MAGV-T is a 37.05 MHz surface mount crystal oscillator manufactured by TXC CORPORATION. This component operates in fundamental mode with a load capacitance of 8pF and an equivalent series resistance (ESR) of 50 Ohms. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing production support and design continuity.

The AT-37.050MAGV-T is specified for industrial and automotive applications, meeting AEC-Q200 reliability standards. Its HC-49/US package format and RoHS compliance make it suitable for modern surface mount assembly processes. Due to its obsolete status, equivalent parts from active manufacturers are required to maintain supply chain continuity.

Key Parameters

Parameter	Value	Unit	Substitution Criticality
Frequency	37.05	MHz	Critical - Must Match Exactly
Frequency Tolerance	±30	ppm	Critical - Must Match or Better
Frequency Stability	±50	ppm	Critical - Must Match or Better
Load Capacitance	8	pF	Critical - Must Match Exactly
ESR (Equivalent Series Resistance)	50	Ohms	Critical - Must Match Exactly
Operating Mode	Fundamental	—	Critical - Must Match Exactly
Operating Temperature Range	-40 to 85	°C	Critical - Must Match or Exceed
Package / Case	HC-49/US	—	Critical - Must Match for PCB Compatibility
Mounting Type	Surface Mount	—	Critical - Must Match Assembly Process
RoHS Status	Compliant	—	Required - Regulatory Compliance
AEC-Q200 Rating	Yes	—	Required - Automotive Qualification
MSL (Moisture Sensitivity Level)	1 (Unlimited)	—	Important - Storage and Handling

Substitute Part Grouping Explanation

Substitution of the AT-37.050MAGV-T is determined by strict equivalence across all critical electrical and mechanical parameters. The following parameters must match exactly or meet the specified tolerance requirements:

Electrical Parameters (Must Match Exactly):

Frequency: 37.05 MHz
Load Capacitance: 8pF
ESR: 50 Ohms
Operating Mode: Fundamental

Frequency Specifications (Must Match or Exceed Accuracy):

Frequency Tolerance: ±30ppm (substitute must be ±30ppm or tighter)
Frequency Stability: ±50ppm (substitute must be ±50ppm or better)

Environmental & Mechanical Parameters (Must Match):

Operating Temperature Range: -40°C to 85°C (substitute must cover this range)
Package / Case: HC-49/US (physical and electrical compatibility)
Mounting Type: Surface Mount
RoHS Compliance: Required
AEC-Q200 Rating: Required for automotive applications

Moisture Sensitivity:

MSL Level 1 (Unlimited) is acceptable; higher MSL levels are not substitutable

Substitute parts are grouped based on identical compliance with these parameters. Only parts meeting all critical criteria are considered true equivalents.

Parameter Comparison

Parameter	AT-37.050MAGV-T (TXC)	AT-37.050MAGV-T (FTS)	Match Status
Manufacturer	TXC CORPORATION	FTS	Different Manufacturer
Frequency	37.05 MHz	37.05 MHz	Exact Match
Frequency Tolerance	±30 ppm	±30 ppm	Exact Match
Frequency Stability	±50 ppm	±50 ppm	Exact Match
Load Capacitance	8 pF	8 pF	Exact Match
ESR	50 Ohms	50 Ohms	Exact Match
Operating Mode	Fundamental	Fundamental	Exact Match
Operating Temperature	-40°C to 85°C	-40°C to 85°C	Exact Match
Package / Case	HC-49/US	HC-49/US	Exact Match
Size / Dimension	11.40mm x 4.80mm	11.40mm x 4.80mm	Exact Match
Height - Seated (Max)	4.10 mm	4.10 mm	Exact Match
Mounting Type	Surface Mount	Surface Mount	Exact Match
RoHS Status	Compliant	Compliant	Exact Match
AEC-Q200 Rating	Yes	Yes	Exact Match
MSL	1 (Unlimited)	1 (Unlimited)	Exact Match
Product Status	Obsolete	Active	Substitute is Active
Packaging	Not specified	Tape & Reel (TR)	Substitute offers standard packaging

Engineering Selection Recommendations

The AT-37.050MAGV-T manufactured by FTS is a direct parametric equivalent to the obsolete TXC CORPORATION part. All critical electrical specifications, mechanical dimensions, and environmental ratings are identical.

Selection Basis:

Electrical Equivalence: The FTS part maintains identical frequency (37.05 MHz), load capacitance (8pF), ESR (50 Ohms), and operating mode (Fundamental). Frequency tolerance and stability specifications are identical at ±30ppm and ±50ppm respectively.
Mechanical Compatibility: Both parts use the HC-49/US package with identical physical dimensions (11.40mm x 4.80mm) and maximum seated height (4.10mm). Surface mount compatibility is preserved.
Environmental & Compliance: The FTS substitute maintains AEC-Q200 automotive qualification, RoHS compliance, and MSL Level 1 rating. Operating temperature range (-40°C to 85°C) is identical.
Product Status Advantage: The FTS part is classified as Active, ensuring ongoing availability and supply chain continuity compared to the obsolete TXC part.
Packaging: The FTS part is supplied in standard Tape & Reel (TR) packaging, suitable for automated assembly processes.

No design modifications, circuit adjustments, or additional testing are required when substituting the FTS part for the TXC part in existing designs.

Frequently Asked Questions (FAQ)

Q: Can the FTS AT-37.050MAGV-T be used as a direct replacement for the TXC AT-37.050MAGV-T?

A: Yes. Both parts are parametrically identical across all critical specifications: frequency (37.05 MHz), load capacitance (8pF), ESR (50 Ohms), operating temperature range (-40°C to 85°C), and package format (HC-49/US). No circuit modifications are required.

Q: What makes these parts substitutable?

A: Substitutability is determined by exact matching of electrical parameters (frequency, load capacitance, ESR, operating mode) and mechanical compatibility (package type, dimensions, mounting method). Both parts meet these criteria identically.

Q: Does the FTS part meet automotive qualification requirements?

A: Yes. The FTS part carries AEC-Q200 rating, identical to the original TXC part. It is qualified for automotive applications.

Q: Are there any differences in RoHS compliance between the two parts?

A: No. Both parts are RoHS Compliant. There are no material composition differences that would affect regulatory compliance.

Q: What is the significance of MSL Level 1?

A: MSL Level 1 (Unlimited) indicates the part has unlimited shelf life and does not require special moisture control during storage or handling. Both the TXC and FTS parts carry this rating.

Q: Does packaging format affect substitutability?

A: Packaging format (Tape & Reel vs. bulk) does not affect electrical or mechanical compatibility. The FTS part's Tape & Reel packaging is standard for automated assembly and does not prevent substitution.

Q: Why is the TXC part listed as obsolete?

A: Product status reflects manufacturer discontinuation. The FTS part, classified as Active, provides equivalent functionality with assured ongoing availability.

Q: Are frequency tolerance and stability specifications critical for substitution?

A: Yes. Both specifications determine circuit performance and timing accuracy. The FTS part matches the TXC part exactly at ±30ppm tolerance and ±50ppm stability, ensuring identical circuit behavior.

Q: Can parts with different frequency tolerances be substituted?

A: No. Frequency tolerance directly affects circuit timing accuracy. Substitutes must match or exceed (be tighter than) the original specification. The FTS part matches exactly at ±30ppm.

Q: What happens if load capacitance differs between parts?

A: Load capacitance affects oscillation frequency and circuit stability. Mismatched load capacitance will cause frequency deviation and potential circuit malfunction. Both parts are specified at 8pF and are therefore compatible.

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