MF-RG400-AP Polymeric PTC Resettable Fuse - Equivalent & Substitute Parts

Part Overview

The MF-RG400-AP is a polymeric PTC resettable fuse manufactured by Bourns Inc., rated for 16V maximum voltage with a 4A hold current. This component is designed for overcurrent protection in electronic circuits and is currently in active production status. Finding equivalent substitute parts is necessary to ensure supply chain flexibility, manage inventory across multiple suppliers, and maintain design continuity when the primary part becomes unavailable or when alternative packaging options are required.

Substiute Parts

MF-RG400-AP

Bourns Inc.In Stock: 940MF-RG400-AP Datasheet

Current PartRFQ

PTR016V0400-BK

Eaton - Electronics DivisionIn Stock: 709PTR016V0400-BK Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MF-RG400-AP is determined by strict electrical and mechanical parameter matching. The following criteria establish functional equivalence:

Electrical Parameters (Critical):

• Voltage - Max: 16V
• Current - Hold (Ih) (Max): 4 A
• Current - Trip (It): 6.8 A
• Time to Trip: 1.7 s
• Resistance - Initial (Ri) (Min): 21 mOhms
• Resistance - Post Trip (R1) (Max): 60 mOhms
• Operating Temperature Range: -40°C ~ 85°C

Mechanical Parameters (Critical):

• Mounting Type: Through Hole
• Package / Case: Radial, Disc
• Type: Polymeric

Compliance Parameters:

• RoHS Status: ROHS3 Compliant
• Approval Agency: cURus minimum requirement

The PTR016V0400-BK from Eaton - Electronics Division meets all critical electrical and mechanical parameters, making it a direct functional equivalent for circuit protection applications requiring 16V/4A polymeric PTC resettable fuse protection.

Parameter Comparison

Engineering Selection Recommendations

The PTR016V0400-BK is a direct electrical and functional equivalent to the MF-RG400-AP. Both components are active products with ROHS3 compliance and cURus approval. The PTR016V0400-BK carries additional TUV certification, providing expanded regulatory coverage.

Physical dimensions show minor variations within typical manufacturing tolerances. The MF-RG400-AP measures 0.390" L x 0.118" W with 0.201" lead spacing, while the PTR016V0400-BK measures 0.350" L x 0.122" W with 0.197" lead spacing. These dimensional differences are negligible for standard through-hole PCB applications and do not affect electrical performance or circuit protection function.

Packaging differs between the two parts: MF-RG400-AP is supplied in Tape & Box format, while PTR016V0400-BK is supplied in Bulk format. This distinction affects procurement and assembly processes but does not impact component functionality.

Frequently Asked Questions (FAQ)

Q: Can PTR016V0400-BK replace MF-RG400-AP in existing designs?

A: Yes. Both components share identical electrical specifications including 16V maximum voltage, 4A hold current, 6.8A trip current, and 1.7s trip time. Both are polymeric PTC resettable fuses with through-hole radial disc packaging. The minor dimensional variations fall within acceptable tolerances for standard PCB layouts.

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

A: Substitution is determined by matching voltage rating (16V), hold current (4A), trip current (6.8A), trip time (1.7s), initial resistance (21 mOhms minimum), post-trip resistance (60 mOhms maximum), operating temperature range (-40°C to 85°C), mounting type (through hole), package type (radial disc), and component type (polymeric). All these parameters are identical between the two parts.

Q: Are there compliance or certification differences?

A: Both parts are ROHS3 compliant and carry cURus approval. The PTR016V0400-BK additionally carries TUV certification, which may be beneficial for applications requiring expanded regulatory documentation.

Q: Does packaging format affect component performance?

A: No. The MF-RG400-AP is supplied in Tape & Box format while PTR016V0400-BK is supplied in Bulk format. Packaging format affects procurement, storage, and assembly logistics but does not alter electrical performance or protection characteristics.

Q: Are the physical dimension differences significant?

A: No. The dimensional variations between the two parts (length 0.390" vs 0.350", width 0.118" vs 0.122", lead spacing 0.201" vs 0.197") are minor and within typical manufacturing tolerances. These differences do not affect PCB layout compatibility for standard through-hole applications.