16R185BPR Polymeric PTC Resettable Fuse - Equivalent & Substitute Parts

Part Overview

The 16R185BPR is a polymeric PTC resettable fuse manufactured by Littelfuse Inc., rated for 16V maximum voltage with a 1.85A hold current. This component is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement. The POLY-FUSE® series device functions as a self-resetting overcurrent protection element suitable for through-hole radial mounting applications.

Key Parameters

Parameter	Value
Voltage - Max	16V
Current - Hold (Ih) (Max)	1.85 A
Current - Trip (It)	3.7 A
Current - Max	40 A
Time to Trip	10 s
Resistance - Initial (Ri) (Min)	30 mOhms
Resistance - Post Trip (R1) (Max)	90 mOhms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	Radial, Disc
Size / Dimension	0.402" L x 0.118" W (10.20mm x 3.00mm)
Height - Seated (Max)	0.618" (15.70mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 16R185BPR is determined by strict equivalence across the following critical parameters:

Voltage rating: 16V maximum
Hold current (Ih): 1.85A maximum
Trip current (It): 3.7A
Time to trip: 10 seconds
Initial resistance (Ri): 30 mOhms minimum
Post-trip resistance (R1): 90 mOhms maximum
Operating temperature range: -40°C to 85°C
Mounting configuration: Through-hole radial disc package
Physical dimensions: 0.402" length, approximately 0.118" to 0.122" width, 0.618" seated height
Lead spacing: 0.197" to 0.201"

All identified substitutes maintain these electrical and mechanical specifications within the stated tolerances, ensuring functional equivalence in circuit protection applications.

Parameter Comparison

Parameter	16R185BPR (Littelfuse)	RUSBF185-AP (Littelfuse)	RUSBF185-2 (Littelfuse)	PTR016V0185-TR (Eaton)
Manufacturer	Littelfuse Inc.	Littelfuse	Littelfuse	Eaton - Electronics Division
Product Status	Obsolete	Active	Active	Active
Series	POLY-FUSE®, USBR	PolySwitch®, RUSBF	PolySwitch®, RUSBF	PTR016V
Voltage - Max	16V	16V	16V	16V
Current - Hold (Ih) (Max)	1.85 A	1.85 A	1.85 A	1.85 A
Current - Trip (It)	3.7 A	3.7 A	3.7 A	3.7 A
Current - Max	40 A	40 A	40 A	40 A
Time to Trip	10 s	10 s	10 s	10 s
Resistance - Initial (Ri) (Min)	30 mOhms	30 mOhms	30 mOhms	30 mOhms
Resistance - Post Trip (R1) (Max)	90 mOhms	90 mOhms	90 mOhms	90 mOhms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc
Size / Dimension	0.402" L x 0.118" W (10.20mm x 3.00mm)	0.402" L x 0.118" W (10.20mm x 3.00mm)	0.402" L x 0.118" W (10.20mm x 3.00mm)	0.402" L x 0.122" W (10.20mm x 3.10mm)
Height - Seated (Max)	0.618" (15.70mm)	0.618" (15.70mm)	0.618" (15.70mm)	0.618" (15.70mm)
Lead Spacing	0.201" (5.10mm)	0.199" (5.05mm)	0.199" (5.05mm)	0.197" (5.00mm)
Packaging	-	Cut Tape (CT)	Cut Tape (CT)	Tape & Reel (TR)
Approval Agency	cURus, TUV	CSA, TUV, UL	CSA, TUV, UL	TUV
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

RUSBF185-2 and RUSBF185-AP are both active Littelfuse PolySwitch® components that provide direct functional equivalence to the obsolete 16R185BPR. Both parts carry expanded regulatory approvals (CSA, TUV, UL) compared to the original device, supporting broader compliance requirements. RUSBF185-2 is designated as the manufacturer-recommended replacement.

PTR016V0185-TR from Eaton - Electronics Division offers an alternative from a different manufacturer while maintaining all critical electrical parameters and mechanical compatibility. This part is supplied in Tape & Reel packaging, suitable for automated assembly processes.

Selection between Littelfuse and Eaton alternatives depends on procurement strategy, supply chain preferences, and packaging requirements. All three substitutes are active products with current manufacturing support and inventory availability.

Frequently Asked Questions (FAQ)

Q: Can RUSBF185-AP be used as a direct replacement for 16R185BPR?

A: Yes. RUSBF185-AP maintains identical electrical specifications (16V, 1.85A hold current, 3.7A trip current, 10-second trip time) and mechanical dimensions. The primary difference is packaging format (Cut Tape versus bulk) and expanded regulatory certifications (CSA, TUV, UL versus cURus, TUV).

Q: What is the difference between RUSBF185-2 and RUSBF185-AP?

A: Both parts are electrically and mechanically identical. RUSBF185-2 is designated as the manufacturer-recommended replacement for 16R185BPR. Differences are limited to packaging format and inventory availability.

Q: Is the Eaton PTR016V0185-TR compatible with the original 16R185BPR circuit design?

A: Yes. PTR016V0185-TR meets all electrical and mechanical substitution criteria. The width dimension is 0.122" (3.10mm) compared to 0.118" (3.00mm) for the original, and lead spacing is 0.197" (5.00mm) versus 0.201" (5.10mm). These minor variations remain within acceptable tolerances for through-hole radial disc packages.

Q: What packaging formats are available for these substitutes?

A: RUSBF185-2 and RUSBF185-AP are supplied in Cut Tape (CT) format. PTR016V0185-TR is supplied in Tape & Reel (TR) format, suitable for high-volume automated assembly.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All identified substitutes (RUSBF185-2, RUSBF185-AP, and PTR016V0185-TR) are ROHS3 compliant, matching the compliance status of the original 16R185BPR.

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