SMDH160-2 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The SMDH160-2 is a polymeric PTC resettable fuse manufactured by Littelfuse Inc. in the PolySwitch® SMD series. This surface mount 2-SMD component is designed for overcurrent protection in 16V circuits with a 1.6A hold current rating. The device is active in production and widely used in electronic applications requiring automatic reset functionality after fault conditions are cleared. Substitute parts are identified when equivalent electrical and mechanical parameters align with the original specification, enabling component interchangeability in circuit designs.

Key Parameters

Parameter	Value	Unit
Voltage - Max	16	V
Current - Hold (Ih) (Max)	1.6	A
Current - Trip (It)	3.2	A
Resistance - Initial (Ri) (Min)	50	mOhms
Resistance - Post Trip (R1) (Max)	150	mOhms
Operating Temperature Range	-40 to 125	°C
Mounting Type	Surface Mount	—
Package / Case	2-SMD	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the SMDH160-2 is determined by strict alignment of the following electrical and mechanical parameters:

Voltage rating: 16V maximum
Current hold (Ih): 1.6A maximum
Current trip (It): 3.2A
Resistance initial (Ri): 50 mOhms minimum
Resistance post-trip (R1): 150 mOhms maximum
Operating temperature: -40°C to 125°C
Mounting type: Surface Mount
Package: 2-SMD
RoHS compliance: ROHS3 Compliant

Two substitute parts meet these criteria: the AHS160-2 from Littelfuse Inc. and the MF-SMHT160-2 from Bourns Inc. Both components share identical electrical specifications and package requirements, enabling direct substitution in circuit applications.

Parameter Comparison

Parameter	SMDH160-2 (Littelfuse)	AHS160-2 (Littelfuse)	MF-SMHT160-2 (Bourns)
Voltage - Max	16V	16V	16V
Current - Hold (Ih) (Max)	1.6A	1.6A	1.6A
Current - Trip (It)	3.2A	3.2A	3.2A
Current - Max	70A	70A	100A
Time to Trip	15s	15s	10s
Resistance - Initial (Ri) (Min)	50 mOhms	50 mOhms	50 mOhms
Resistance - Post Trip (R1) (Max)	150 mOhms	150 mOhms	150 mOhms
Operating Temperature	-40 to 125°C	-40 to 125°C	-40 to 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	2-SMD	2-SMD	2-SMD
Size / Dimension	0.343" L x 0.250" W (8.70mm x 6.36mm)	0.343" L x 0.250" W (8.70mm x 6.36mm)	0.374" L x 0.234" W (9.50mm x 5.94mm)
Thickness (Max)	0.118" (3.00mm)	0.118" (3.00mm)	0.118" (3.00mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	2A (4 Weeks)	2A (4 Weeks)	1 (Unlimited)
Product Status	Active	Active	Active

Engineering Selection Recommendations

All three components—SMDH160-2, AHS160-2, and MF-SMHT160-2—are active production parts with ROHS3 compliance and REACH unaffected status, meeting current environmental and regulatory requirements.

The AHS160-2 is a parametric equivalent from Littelfuse Inc., sharing identical electrical specifications and physical dimensions with the SMDH160-2. This part carries AEC-Q200 automotive qualification.

The MF-SMHT160-2 from Bourns Inc. meets all critical electrical parameters but differs in three areas: maximum current rating (100A versus 70A), time to trip (10s versus 15s), and physical dimensions (9.50mm x 5.94mm versus 8.70mm x 6.36mm). The MF-SMHT160-2 also features superior moisture sensitivity (MSL 1 unlimited versus MSL 2A 4 weeks). These differences do not affect substitution eligibility for applications requiring 16V, 1.6A hold current protection.

Frequently Asked Questions (FAQ)

Q: Can the AHS160-2 be used as a direct replacement for the SMDH160-2?

A: Yes. The AHS160-2 shares identical electrical parameters, operating temperature range, and physical dimensions with the SMDH160-2. Both are manufactured by Littelfuse Inc. and are ROHS3 compliant. The AHS160-2 includes AEC-Q200 automotive qualification.

Q: What are the key differences between the MF-SMHT160-2 and the SMDH160-2?

A: The MF-SMHT160-2 differs in three specifications: maximum current (100A versus 70A), time to trip (10s versus 15s), and physical dimensions (9.50mm x 5.94mm versus 8.70mm x 6.36mm). The MF-SMHT160-2 also has superior moisture sensitivity (MSL 1 unlimited). All critical electrical parameters—voltage, hold current, trip current, and resistance values—are identical.

Q: Will the MF-SMHT160-2 fit in a PCB layout designed for the SMDH160-2?

A: The MF-SMHT160-2 has slightly different dimensions (9.50mm x 5.94mm versus 8.70mm x 6.36mm). PCB layout compatibility must be verified before substitution. Both components use 2-SMD packaging and 0.118" (3.00mm) maximum thickness.

Q: Are all three parts RoHS compliant?

A: Yes. The SMDH160-2, AHS160-2, and MF-SMHT160-2 are all ROHS3 compliant and REACH unaffected.

Q: What is the significance of the AEC-Q200 rating on the AHS160-2?

A: AEC-Q200 is an automotive qualification standard. The AHS160-2 meets this standard; the SMDH160-2 and MF-SMHT160-2 do not list this certification. For non-automotive applications, this difference is not relevant to substitution.

Q: Can I substitute based on hold current and trip current alone?

A: No. Substitution requires alignment of all specified electrical and mechanical parameters: voltage rating, hold current, trip current, resistance values, operating temperature, mounting type, package configuration, and compliance certifications. All three parts meet these requirements.

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