MET-01 Audio Transformer Equivalent & Substitute Parts

Part Overview

The MET-01 is a 200kCT:1kCT audio transformer manufactured by Tamura, designed for data/voice coupling applications. This through-hole component operates across the 300Hz to 100kHz frequency range with a 14.1:1 turns ratio. The part is currently active in production with 867 pieces available in stock.

Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and operational specifications can be maintained across different manufacturers. The MET-01 has one qualified substitute in the Triad Magnetics Red-Spec series.

Substiute Parts

MET-01

TamuraIn Stock: 882MET-01 Datasheet

Current PartRFQ

SP-4

Triad MagneticsIn Stock: 1249SP-4 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MET-01 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

• Turns Ratio: 14.1:1 (Primary:Secondary)
• Primary Impedance: 200kCT Ohms
• Secondary Impedance: 1kCT Ohms
• Frequency Range: 300Hz ~ 100kHz minimum
• Frequency Response: ±2dB or better
• Power Level: 10mW or greater

Mechanical Equivalence Requirements:

• Mounting Type: Through Hole
• Termination Style: PC Pin
• Physical dimensions compatible with 0.409" L x 0.310" W footprint
• Height - Seated (Max): 0.465" or less

Compliance Requirements:

• RoHS compliance status (RoHS or ROHS3)
• Active product status

The SP-4 from Triad Magnetics meets all substitution criteria and is classified as a direct equivalent substitute.

Parameter Comparison

Engineering Selection Recommendations

MET-01 (Tamura) Selection Criteria:

• Primary choice when Tamura component qualification is required
• Active product status with 867 pieces in stock
• RoHS Compliant certification
• MSL Level 1 rating for unlimited moisture exposure tolerance

SP-4 (Triad Magnetics) Selection Criteria:

• Direct substitute when Triad Magnetics sourcing is preferred
• Active product status with 1175 pieces in stock
• ROHS3 Compliant certification
• Extended operating temperature range (-40°C to 85°C) suitable for wider environmental applications
• Higher isolation voltage rating (1000VRMS vs 500VRMS) for applications requiring enhanced dielectric strength
• Slightly lower secondary DC resistance (100Ohm vs 120Ohm) with negligible impact on audio coupling performance

Both parts maintain equivalent electrical performance for data/voice coupling applications within the 300Hz to 100kHz frequency band. Selection between MET-01 and SP-4 is based on manufacturer preference, inventory availability, and specific environmental or isolation requirements.

Frequently Asked Questions (FAQ)

Q: Can SP-4 replace MET-01 in existing designs?

A: Yes. The SP-4 maintains electrical equivalence across all critical parameters: 14.1:1 turns ratio, 200kCT primary impedance, 1kCT secondary impedance, 300Hz to 100kHz frequency range, and ±2dB frequency response. Mechanical compatibility is confirmed through identical through-hole mounting, PC pin termination, and equivalent physical dimensions.

Q: What is the difference in secondary DC resistance between MET-01 and SP-4?

A: The MET-01 has 120Ohm secondary DC resistance while SP-4 has 100Ohm. This 20Ohm difference does not affect substitution eligibility for audio coupling applications and produces negligible impact on circuit performance.

Q: Does SP-4 have better isolation voltage than MET-01?

A: Yes. SP-4 is rated at 1000VRMS @ 1 Second compared to MET-01 at 500VRMS @ 30 Seconds. The SP-4 provides higher dielectric strength, making it suitable for applications requiring enhanced isolation specifications.

Q: Are both parts RoHS compliant?

A: Yes. MET-01 is RoHS Compliant and SP-4 is ROHS3 Compliant. Both meet current environmental compliance requirements.

Q: What is the operating temperature difference?

A: MET-01 operates from -20°C to 85°C while SP-4 operates from -40°C to 85°C. SP-4 supports a wider temperature range, making it suitable for applications requiring extended low-temperature performance.

Q: Are the physical dimensions identical?

A: Dimensions are equivalent. MET-01 measures 0.409" L x 0.310" W (10.40mm x 7.87mm) and SP-4 measures 0.410" L x 0.310" W (10.41mm x 7.87mm). The 0.01mm length difference is negligible for PCB layout compatibility.

Q: What packaging formats are available?

A: MET-01 is supplied in Tube packaging while SP-4 is supplied in Bulk packaging. Packaging format does not affect electrical or mechanical compatibility.

Q: Can I use SP-4 if my design specifies MET-01?

A: SP-4 is a qualified substitute meeting all electrical and mechanical requirements. Design approval authority should confirm acceptance of the Triad Magnetics part number for your specific application.