FCA-125-13 Equivalent & Substitute Parts

Part Overview

The FCA-125-13 is a general purpose relay manufactured by TE Connectivity Aerospace, Defense and Marine. This SPDT (1 Form C) relay operates on a 28VDC coil and is designed for chassis mount applications in aerospace, defense, and marine environments. The part features hermetically sealed construction with silver cadmium oxide contacts rated for 25 amperes and maximum switching loads of 2875VA at 115VAC or 700W at 28VDC.

The FCA-125-13 maintains active product status with 651 pieces in current inventory. Substitute parts are identified to provide alternative sourcing options when the primary part number is unavailable or when design flexibility permits equivalent component selection.

Substiute Parts

FCA-125-13

TE Connectivity Aerospace, Defense and MarineIn Stock: 707FCA-125-13 Datasheet

Current PartRFQ

FCA-125-3703L

TE Connectivity Aerospace, Defense and MarineIn Stock: 885FCA-125-3703L Datasheet

Parametric EquivalentRFQ

FCA-125-AY4

TE Connectivity Aerospace, Defense and MarineIn Stock: 976FCA-125-AY4 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FCA-125-13 are qualified based on electrical and mechanical parameter equivalence within the FCA-125 series. The substitution logic is based on the following critical parameters that must remain constant across all equivalent parts:

Electrical Parameters:

• Coil voltage: 28VDC
• Contact form: SPDT (1 Form C)
• Contact current rating: 25 A
• Coil current: 87.5 mA
• Coil resistance: 320 Ohms
• Must operate voltage: 18 VDC
• Must release voltage: 1.5 VDC
• Switching voltage: 115VAC, 28VDC - Max
• Operate and release times: 10 ms each

Mechanical Parameters:

• Mounting type: Chassis Mount
• Termination style: PC Pin
• Seal rating: Sealed - Hermetically
• Contact material: Silver Cadmium Oxide (AgCdO)
• Operating temperature range: -70°C ~ 125°C
• Coil type: Non Latching
• Features: Diode

All substitute parts maintain identical electrical and mechanical specifications, ensuring direct functional interchangeability within the FCA-125 series classification.

Parameter Comparison

Engineering Selection Recommendations

All three parts—FCA-125-13, FCA-125-3703L, and FCA-125-AY4—are active products manufactured by TE Connectivity Aerospace, Defense and Marine within the FCA-125 series. Each part maintains identical electrical and mechanical specifications, ensuring functional interchangeability in 28VDC SPDT relay applications.

Compliance and Regulatory Status: All parts share identical compliance profiles: RoHS non-compliant, REACH Unaffected, ECCN EAR99, and HTSUS 8536.41.0050. Moisture sensitivity level is 1 (Unlimited) for all parts, indicating no special storage or handling requirements.

Selection Basis: Component selection among these three equivalents may be determined by inventory availability, lead time requirements, or design documentation specifications. The FCA-125-3703L and FCA-125-AY4 currently maintain higher inventory levels (842 and 897 pieces respectively) compared to the FCA-125-13 (651 pieces).

Frequently Asked Questions (FAQ)

Q: Are FCA-125-3703L and FCA-125-AY4 direct substitutes for FCA-125-13?

A: Yes. Both parts are parametric equivalents within the FCA-125 series. All electrical parameters (coil voltage, contact form, current ratings, switching voltage, coil resistance, operate/release times, and voltage thresholds) are identical. All mechanical parameters (mounting type, termination style, seal rating, contact material, and operating temperature range) are identical. Direct substitution is supported without circuit modification.

Q: What are the critical parameters that define substitutability for this relay?

A: Substitutability is determined by equivalence in coil voltage (28VDC), contact form (SPDT), contact current rating (25 A), coil current (87.5 mA), coil resistance (320 Ohms), switching voltage (115VAC, 28VDC - Max), must operate voltage (18 VDC), must release voltage (1.5 VDC), operate and release times (10 ms each), mounting type (Chassis Mount), termination style (PC Pin), seal rating (Hermetically Sealed), contact material (Silver Cadmium Oxide), and operating temperature range (-70°C ~ 125°C).

Q: Do all three parts have the same load-switching capability?

A: The FCA-125-13 specifies maximum switching loads of 2875VA at 115VAC and 700W at 28VDC. The FCA-125-3703L and FCA-125-AY4 do not provide load-switching specifications in the available data. However, all three parts maintain identical contact current ratings (25 A) and switching voltage specifications (115VAC, 28VDC - Max), which are the primary electrical parameters governing load capacity.

Q: Are there any packaging or inventory differences between these parts?

A: All three parts are supplied in Bulk packaging. Current inventory levels differ: FCA-125-13 has 651 pieces, FCA-125-3703L has 842 pieces, and FCA-125-AY4 has 897 pieces in stock. Packaging format and termination style (PC Pin) are identical across all three parts.

Q: What is the operating temperature range for these relays?

A: All three parts operate across the identical temperature range of -70°C to 125°C, supporting aerospace, defense, and marine applications requiring extended thermal performance.

Q: Are these parts RoHS compliant?

A: No. All three parts are RoHS non-compliant due to the silver cadmium oxide contact material. However, all parts maintain REACH Unaffected status and are classified under ECCN EAR99 for export control purposes.