FHC16402ADTP Equivalent & Substitute Parts

Part Overview

The FHC16402ADTP is a 4 A surface mount fuse rated for 24 V DC operation in a 0603 (1608 Metric) package form factor. Manufactured by Kamaya Inc., this fast-blow fuse is designed for board-level circuit protection applications requiring compact form factors and high current density. The part maintains active product status with substantial inventory availability. Substitute parts are identified to address application requirements including extended voltage ratings, alternative response characteristics, or supply chain considerations while maintaining core electrical and mechanical compatibility within the 0603 surface mount fuse category.

Substiute Parts

FHC16402ADTP

Kamaya Inc.In Stock: 41877FHC16402ADTP Datasheet

Current PartRFQ

SF-0603S400-2

Bourns Inc.In Stock: 6801SF-0603S400-2 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FHC16402ADTP is determined by the following mandatory parameters:

Electrical Compatibility Requirements:

• Current Rating: Must equal 4 A
• Voltage Rating - DC: Must equal or exceed 24 V
• Package / Case: Must equal 0603 (1608 Metric)
• Mounting Type: Must equal Surface Mount

Regulatory & Environmental Requirements:

• RoHS Status: Must maintain ROHS3 Compliance
• Operating Temperature: Must support minimum -55°C ~ 125°C range or be suitable for the intended application environment

Mechanical Requirements:

• Physical dimensions must accommodate 0603 package footprint
• Moisture Sensitivity Level: MSL 1 (Unlimited) preferred for handling consistency

The substitute part SF-0603S400-2 from Bourns Inc. satisfies the core electrical and mechanical compatibility criteria. Differences in response time (Slow Blow vs. Fast Blow) and operating temperature range represent functional variations that must be evaluated against specific circuit protection requirements.

Parameter Comparison

Engineering Selection Recommendations

Primary Part Selection (FHC16402ADTP): The FHC16402ADTP is the specified component for applications requiring fast-blow response characteristics within the -55°C ~ 125°C operating temperature range. This part carries dual agency approval (CSA and UL) and maintains active product status with high inventory availability. Selection is appropriate for circuits where rapid fault detection and interruption are critical design parameters.

Substitute Part Selection (SF-0603S400-2): The SF-0603S400-2 serves as an electrical and mechanical substitute for applications where slow-blow response characteristics are acceptable or preferred. The higher voltage rating (32 V) and breaking capacity (50 A) provide design margin for 24 V DC circuits. The narrower operating temperature range (-20°C ~ 105°C) requires verification against application environmental specifications. UL approval is confirmed; CSA approval status is not provided in available documentation. This substitute is suitable for standard industrial temperature environments where the -20°C lower limit is not a constraint.

Both parts maintain ROHS3 compliance and MSL 1 moisture sensitivity classification, supporting equivalent handling and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can SF-0603S400-2 directly replace FHC16402ADTP in all applications?

A: Direct replacement is possible from an electrical and mechanical standpoint. Both parts share identical 4 A current rating and 0603 package form factor. However, the response time differs (Slow Blow vs. Fast Blow), and the operating temperature range is narrower (-20°C ~ 105°C vs. -55°C ~ 125°C). Verify that the application circuit protection strategy accommodates slow-blow response and that the operating environment remains within -20°C to 105°C limits.

Q: What does the voltage rating difference (24 V vs. 32 V) mean for substitution?

A: The SF-0603S400-2 is rated for 32 V DC, which exceeds the 24 V requirement of the FHC16402ADTP. A higher voltage rating indicates the fuse can safely operate at the lower voltage without degradation. This represents a design margin and does not create incompatibility. The fuse will function correctly in a 24 V circuit.

Q: Are there differences in physical dimensions between these parts?

A: Both parts conform to the 0603 (1608 Metric) package standard. Dimensional specifications are nearly identical: FHC16402ADTP measures 0.063" L x 0.031" W x 0.018" H, while SF-0603S400-2 measures 0.063" L x 0.032" W x 0.018" H. The 0.001" width difference is within standard package tolerance and does not affect PCB footprint compatibility.

Q: What is the significance of the DC Cold Resistance difference?

A: The FHC16402ADTP has 0.019 Ohms cold resistance, while SF-0603S400-2 has 0.012 Ohms. Lower resistance in the substitute part results in reduced voltage drop across the fuse during normal operation. This difference is typically negligible in most circuit applications but may be relevant in low-voltage, high-current designs where voltage drop accumulation is a design consideration.

Q: Does the approval agency difference affect substitution eligibility?

A: The FHC16402ADTP carries CSA and UL approvals, while SF-0603S400-2 carries UL approval only. If the application circuit design specifically requires CSA certification, the substitute part does not meet that requirement. Verify certification requirements in the application specification before substitution.

Q: What does "Slow Blow" vs. "Fast Blow" mean in practical terms?

A: Fast Blow fuses (FHC16402ADTP) interrupt circuits rapidly upon overcurrent detection, typically within milliseconds. Slow Blow fuses (SF-0603S400-2) tolerate brief current surges before interruption, allowing transient overcurrents to pass without nuisance trips. Circuit protection strategy determines which response type is appropriate. Fast Blow is preferred for sensitive electronics; Slow Blow is preferred for inductive loads or circuits with startup current surges.

Q: Can these parts be used interchangeably in inventory management?

A: From a component-level perspective, both parts satisfy the 4 A, 24 V DC, 0603 surface mount fuse category. However, they should not be commingled in inventory without clear circuit-level documentation. The response time difference and operating temperature range variation require circuit-specific validation. Maintain separate stock designations and implement design verification before authorizing substitution in production assemblies.