SP-22 Audio Transformer Equivalent & Substitute Parts

Part Overview

The SP-22 is an audio coupling transformer manufactured by Triad Magnetics, part of the Red-Spec series. This through-hole mounted component features a 10kΩ primary impedance with a split secondary configuration (2kΩ, 500/500Ω) and a 4.48:1:1 turns ratio. The transformer operates across the 300Hz to 100kHz frequency range with ±2dB frequency response, suitable for audio signal coupling applications requiring 50mW power handling. The part maintains Active product status with 1139 units in current inventory. Substitute parts are identified when inventory constraints, supply chain disruptions, or procurement requirements necessitate alternative sourcing while maintaining electrical and mechanical compatibility.

Substiute Parts

SP-22

Triad MagneticsIn Stock: 1198SP-22 Datasheet

Current PartRFQ

SP-22-B

Triad MagneticsIn Stock: 1017SP-22-B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SP-22 are qualified based on strict electrical and mechanical parameter matching. The substitution criteria are defined by the following key parameters:

Electrical Parameters: Turns ratio (4.48:1:1), primary impedance (10kΩ), secondary impedance configuration (2kΩ, 500/500Ω), DC resistance values (primary 1.05kΩ, secondary 146/168Ω), frequency range (300Hz ~ 100kHz), frequency response (±2dB), power level (50mW), and isolation voltage (1000VRMS @ 1 Second).

Mechanical Parameters: Through-hole mounting type, PC pin termination style, physical dimensions (0.410" L x 0.310" W, 11.80mm max height), and transformer classification as audio coupling type.

Compliance Parameters: ROHS3 compliance, REACH unaffected status, and Active product status.

Only parts matching all specified electrical, mechanical, and compliance parameters are listed as direct substitutes. No parameter deviation is permitted.

Parameter Comparison

Engineering Selection Recommendations

Both SP-22 and SP-22-B are Active products manufactured by Triad Magnetics within the Red-Spec series. Both parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component procurement. The parts are electrically and mechanically identical across all specified parameters, including impedance matching, frequency response characteristics, isolation voltage ratings, and physical form factor.

Selection between SP-22 and SP-22-B should be based on inventory availability and procurement lead time requirements. The SP-22 maintains higher current stock (1139 units) compared to SP-22-B (975 units). Both parts are suitable for direct substitution in audio coupling transformer applications requiring 10kΩ primary impedance, split secondary configuration, and operation within the 300Hz to 100kHz frequency band.

Frequently Asked Questions (FAQ)

Q: Can SP-22-B be used as a direct replacement for SP-22 in existing designs?

A: Yes. SP-22-B is electrically and mechanically identical to SP-22 across all specified parameters. Both parts share identical impedance values, turns ratios, frequency response characteristics, isolation voltage ratings, physical dimensions, and mounting configurations. Direct substitution is supported without circuit modification.

Q: What are the critical parameters that define substitution compatibility for this transformer?

A: Substitution compatibility is determined by: turns ratio (4.48:1:1), primary impedance (10kΩ), secondary impedance (2kΩ, 500/500Ω), DC resistance values, frequency range (300Hz ~ 100kHz), frequency response (±2dB), power level (50mW), isolation voltage (1000VRMS), through-hole mounting type, PC pin termination, and physical dimensions (0.410" L x 0.310" W x 0.465" max height).

Q: Are there compliance or regulatory differences between SP-22 and SP-22-B?

A: No. Both parts maintain identical ROHS3 compliance status and REACH unaffected classification. Both are Active products with no approval agency restrictions specified.

Q: What is the operating temperature range for both parts?

A: Both SP-22 and SP-22-B operate across -40°C to 85°C. This range applies to all electrical and mechanical specifications.

Q: How do the DC resistance values affect circuit performance?

A: Primary DC resistance is 1.05kΩ for both parts. Secondary DC resistance is 146Ω and 168Ω for the split secondary windings. These values are identical between SP-22 and SP-22-B and determine insertion loss characteristics in audio coupling applications.

Q: Is the frequency response specification identical between both parts?

A: Yes. Both SP-22 and SP-22-B maintain ±2dB frequency response across the 300Hz to 100kHz operating range. Frequency response characteristics are identical.

Q: What is the maximum power handling capability?

A: Both parts are rated for 50mW power level. This specification is identical for SP-22 and SP-22-B.