RHE070 Equivalent & Substitute Parts

Part Overview

The RHE070 is a polymeric PTC resettable fuse manufactured by Littelfuse Inc., rated for 16V maximum voltage and 700 mA hold current. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing system support and component procurement.

PTC resettable fuses function as automatic circuit protection devices that increase in resistance when exposed to overcurrent conditions, then return to normal operation once the fault is cleared. The RHE070 is designed for through-hole radial mounting in disc form factor applications requiring 16V protection at 700 mA hold current levels.

Substiute Parts

RHE070

Littelfuse Inc.In Stock: 886RHE070 Datasheet

Current PartRFQ

RHEF070

LittelfuseIn Stock: 3714RHEF070 Datasheet

DirectRFQ

MF-RHT070-0

Bourns Inc.In Stock: 1508MF-RHT070-0 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RHE070 are identified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

• Current - Hold (Ih) (Max): 700 mA
• Current - Trip (It): 1.4 A
• Mounting Type: Through Hole
• Package / Case: Radial, Disc
• Physical dimensions compatible with PCB layout

Secondary Compatibility Factors:

• Voltage rating must equal or exceed 16V
• Resistance characteristics (initial and post-trip) within acceptable operating ranges
• Time to trip response characteristics

Two substitute parts meet these criteria:

RHEF070 (Littelfuse Inc.) – Direct manufacturer alternative with identical hold current and trip current, rated for 30V maximum voltage. Maintains the same physical form factor and lead spacing. Product status is active with RoHS3 compliance.

MF-RHT070-0 (Bourns Inc.) – Cross-manufacturer equivalent with matching 16V voltage rating and 700 mA hold current. Maintains radial disc form factor with compatible physical dimensions. Lead spacing differs at 0.114" versus 0.199", requiring PCB layout verification. Product status is active with RoHS3 compliance and AEC-Q200 automotive rating.

Parameter Comparison

Engineering Selection Recommendations

RHEF070 Selection: This Littelfuse part is the preferred substitute when voltage headroom is acceptable. It maintains identical hold and trip current specifications, matching physical dimensions, and identical lead spacing (0.199"). The higher 30V voltage rating provides additional margin above the 16V requirement. Active product status ensures ongoing availability. RoHS3 compliance supports modern manufacturing and environmental standards. The faster trip time (3.2 s versus 4 s) and lower post-trip resistance (800 mOhms versus 1.4 Ohms) represent improved performance characteristics.

MF-RHT070-0 Selection: This Bourns part provides a cross-manufacturer alternative with exact voltage matching at 16V. Identical hold and trip current ratings and matching time-to-trip response (4 s) ensure functional equivalence. Active product status and RoHS3 compliance are present. The critical consideration is lead spacing: 0.114" versus the original 0.199" requires PCB layout verification before implementation. AEC-Q200 automotive qualification provides additional reliability assurance for demanding applications.

Frequently Asked Questions (FAQ)

Q: Can RHEF070 be used as a direct replacement for RHE070?

A: Yes. Both parts share identical hold current (700 mA), trip current (1.4 A), mounting type (through hole), form factor (radial disc), and lead spacing (0.199"). The RHEF070 operates at a higher maximum voltage (30V versus 16V), which is compatible with 16V circuit requirements. Physical dimensions are identical, allowing direct PCB substitution without layout modification.

Q: What is the primary difference between RHEF070 and RHE070?

A: The RHEF070 is rated for 30V maximum voltage compared to RHE070's 16V rating. Additionally, RHEF070 exhibits faster trip response (3.2 s versus 4 s) and lower post-trip resistance (800 mOhms versus 1.4 Ohms). Both are Littelfuse PolySwitch® series components with identical current ratings and physical form factors.

Q: Can MF-RHT070-0 replace RHE070 without PCB modification?

A: MF-RHT070-0 requires PCB layout verification due to different lead spacing. The original RHE070 has 0.199" lead spacing, while MF-RHT070-0 has 0.114" spacing. If the PCB footprint accommodates this difference, substitution is functionally viable. All electrical parameters (16V voltage, 700 mA hold current, 1.4 A trip current, 4 s trip time) are identical.

Q: Why is RHE070 listed as obsolete?

A: RHE070 is an older Littelfuse PolySwitch® design. Active alternatives (RHEF070 and MF-RHT070-0) provide equivalent or improved performance with modern compliance certifications (RoHS3). Littelfuse recommends RHEF070 as the direct successor for new designs and ongoing support.

Q: Are there compliance differences between these parts?

A: Yes. RHE070 is RoHS non-compliant. Both RHEF070 and MF-RHT070-0 are RoHS3 compliant, meeting current environmental and manufacturing standards. MF-RHT070-0 additionally carries AEC-Q200 automotive qualification.

Q: What is the impact of different post-trip resistance values?

A: Post-trip resistance affects circuit behavior after the fuse trips. RHE070 has 1.4 Ohms maximum post-trip resistance, while RHEF070 and MF-RHT070-0 have 800 mOhms maximum. Lower post-trip resistance reduces voltage drop and power dissipation in the tripped state, representing improved performance in both substitute parts.