PC-34-35B21 Equivalent & Substitute Parts

Part Overview

The PC-34-35B21 is a laminated core power transformer rated at 1.2VA with through-hole mounting and PC pin termination. It features a single primary winding (115V) and dual secondary windings capable of delivering 17V parallel or 34V series output, with maximum currents of 70mA parallel or 35mA series respectively. The part is currently obsolete, making identification of compatible substitutes essential for ongoing system support and component procurement.

Substiute Parts

PC-34-35B21

Pulse ElectronicsIn Stock: 660PC-34-35B21 Datasheet

Current PartRFQ

PC-34-35

Signal TransformerIn Stock: 1083PC-34-35 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PC-34-35B21 is determined by strict equivalence across the following critical parameters:

• Primary voltage specification (115V)
• Secondary voltage configuration (Parallel 17V, Series 34V dual winding)
• Maximum output current ratings (Parallel 70mA, Series 35mA)
• Power rating (1.2VA)
• Core type (Laminated)
• Winding configuration (Single primary, dual secondary, no center tap)
• Mounting and termination (Through hole, PC pin)
• Isolation voltage (1500Vrms)

The PC-34-35 from Signal Transformer meets all these specifications and qualifies as a direct equivalent substitute.

Parameter Comparison

Engineering Selection Recommendations

The PC-34-35 from Signal Transformer is a direct functional equivalent to the obsolete PC-34-35B21. The substitute part maintains identical electrical specifications across all primary parameters: voltage ratings, current capacity, power rating, winding configuration, and isolation voltage. Physical dimensions are within negligible tolerance (±0.03mm length, ±0.02mm width, ±0.03mm height), confirming mechanical compatibility for through-hole PCB mounting.

The Signal Transformer PC-34-35 carries Active product status with ROHS3 compliance, providing supply continuity and regulatory alignment for new designs or system updates. Both parts share identical REACH and ECCN classifications, confirming regulatory equivalence.

Frequently Asked Questions (FAQ)

Q: Can the PC-34-35 directly replace the PC-34-35B21 in existing designs?

A: Yes. The PC-34-35 meets all electrical and mechanical specifications of the PC-34-35B21. Dimensional tolerances are within acceptable limits for through-hole PCB mounting without modification.

Q: What are the key parameters that determine substitution eligibility?

A: Substitution requires matching: primary voltage (115V), secondary voltage configuration (Parallel 17V, Series 34V), output current ratings (Parallel 70mA, Series 35mA), power rating (1.2VA), core type (laminated), winding configuration (single primary, dual secondary), mounting type (through hole), termination style (PC pin), and isolation voltage (1500Vrms).

Q: Are there packaging differences between these parts?

A: The PC-34-35B21 is specified with dash packaging, while the PC-34-35 is supplied in box packaging. This reflects distribution and handling differences only and does not affect functional performance or PCB integration.

Q: What is the compliance status of the substitute part?

A: The PC-34-35 is ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. The original PC-34-35B21 is obsolete and no longer manufactured.

Q: Are the physical dimensions identical?

A: Dimensions are functionally equivalent within engineering tolerance. Length differs by 0.03mm (34.93mm vs 34.90mm), width by 0.02mm (28.58mm vs 28.60mm), and height by 0.03mm (30.18mm vs 30.15mm). These variations are within standard PCB mounting tolerances.