MET-03 Audio Transformer Equivalent & Substitute Parts

Part Overview

The MET-03 is a 50kCT: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 7.07:1 turns ratio and 25mW power level rating. The part is currently in active production status with 957 units available in inventory. Equivalent and substitute parts are identified when they maintain the same primary impedance, secondary impedance, frequency range, mounting type, and power rating specifications.

Substiute Parts

MET-03

TamuraIn Stock: 1051MET-03 Datasheet

Current PartRFQ

SP-5

Triad MagneticsIn Stock: 822SP-5 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MET-03 is determined by the following critical parameters:

Primary Substitution Criteria:

• Impedance - Primary: 50kCT (exact match required)
• Impedance - Secondary: 1kCT (exact match required)
• Frequency Range: 300Hz ~ 100kHz (exact match required)
• Mounting Type: Through Hole (exact match required)
• Power Level: 25mW (exact match required)

Secondary Compatibility Factors:

• Turns Ratio tolerance within ±5% of 7.07:1
• DC Resistance values within acceptable operating parameters
• Frequency Response: ±2dB (standard specification)
• Voltage Isolation rating of 500VRMS or higher
• Operating Temperature range encompassing -20°C to 85°C

The SP-5 from Triad Magnetics satisfies all primary substitution criteria and maintains compatibility across secondary factors.

Parameter Comparison

Engineering Selection Recommendations

MET-03 (Tamura) - Primary Selection:

• Active production status with 957 units in stock
• RoHS Compliant certification
• Established supply chain availability
• Suitable for applications requiring standard isolation voltage (500VRMS)

SP-5 (Triad Magnetics) - Qualified Substitute:

• Active production status with 785 units in stock
• ROHS3 Compliant certification (enhanced environmental standard)
• Enhanced isolation voltage rating (1000VRMS) provides additional safety margin
• Extended operating temperature range (-40°C to 85°C) accommodates broader environmental conditions
• Functionally equivalent physical dimensions and mounting characteristics
• Turns ratio of 7.1:1 represents 0.42% deviation from MET-03 specification, within acceptable tolerance for audio coupling applications

Both parts meet the electrical and mechanical requirements for direct substitution in through-hole PCB applications requiring 50kCT:1kCT audio transformer functionality.

Frequently Asked Questions (FAQ)

Q: Can SP-5 be used as a direct replacement for MET-03 in existing designs?

A: Yes. The SP-5 maintains identical primary impedance (50kCT), secondary impedance (1kCT), frequency range (300Hz ~ 100kHz), power rating (25mW), mounting type (through hole), and physical dimensions. The turns ratio difference of 0.42% (7.1:1 vs 7.07:1) is within acceptable tolerance for audio coupling applications.

Q: What are the key differences between MET-03 and SP-5?

A: The SP-5 provides enhanced isolation voltage (1000VRMS vs 500VRMS) and extended operating temperature range (-40°C to 85°C vs -20°C to 85°C). Secondary DC resistance differs (75Ohm vs 105Ohm). Both differences favor the SP-5 for applications requiring higher safety margins or broader environmental operation.

Q: Are there packaging differences between these parts?

A: MET-03 is supplied in tube packaging, while SP-5 is supplied in bulk packaging. Both use identical PC pin termination and through-hole mounting. Packaging selection depends on assembly process requirements and inventory management practices.

Q: Do both parts meet current compliance standards?

A: Yes. MET-03 is RoHS Compliant. SP-5 is ROHS3 Compliant, representing a more recent environmental compliance standard. Both parts carry EAR99 ECCN classification.

Q: What determines whether a transformer can substitute for MET-03?

A: Substitution requires exact matching of primary impedance (50kCT), secondary impedance (1kCT), frequency range (300Hz ~ 100kHz), mounting type (through hole), and power rating (25mW). Turns ratio tolerance of ±5% is acceptable. Physical dimensions must accommodate existing PCB layouts.

Q: Can MET-03 be used in applications requiring 1000VRMS isolation?

A: No. MET-03 is rated for 500VRMS isolation. Applications requiring 1000VRMS isolation must use SP-5 or equivalent parts with higher isolation ratings.