Equivalent & Substitute Parts for 0ZCD0185FF2C

Part Overview

The 0ZCD0185FF2C is a polymeric PTC resettable fuse manufactured by Bel Fuse Inc., rated for 33V at 1.85A hold current in a 2920 surface mount package. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The part provides overcurrent protection through automatic thermal reset functionality, with approval from cURus and TUV agencies.

Key Parameters

Parameter	Value
Voltage - Max	33V
Current - Hold (Ih) (Max)	1.85 A
Current - Trip (It)	3.7 A
Resistance - Initial (Ri) (Min)	40 mOhms
Resistance - Post Trip (R1) (Max)	150 mOhms
Operating Temperature Range	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	2920 (7351 Metric)
Type	Polymeric

Substitute Part Grouping Explanation

Substitution eligibility for the 0ZCD0185FF2C is determined by the following critical parameters:

Maximum voltage rating of 33V or higher
Hold current (Ih) of 1.85A or higher
Trip current (It) within acceptable operating margin
Initial resistance (Ri) and post-trip resistance (R1) within specified ranges
Surface mount configuration with compatible package footprint
Operating temperature range of -40°C to 85°C or broader

The identified substitute parts meet these core electrical requirements while maintaining functional equivalence for overcurrent protection applications.

Parameter Comparison

Parameter	0ZCD0185FF2C (Main)	0ZCF0185FF2C (Substitute)	SMD185F-2 (Substitute)
Manufacturer	Bel Fuse Inc.	Bel Fuse Inc.	Littelfuse Inc.
Product Status	Obsolete	Active	Active
Voltage - Max	33V	33V	33V
Current - Hold (Ih) (Max)	1.85 A	1.85 A	1.85 A
Current - Trip (It)	3.7 A	3.7 A	3.6 A
Current - Max	40 A	100 A	40 A
Time to Trip	2.5 s	2.5 s	5 s
Resistance - Initial (Ri) (Min)	40 mOhms	40 mOhms	65 mOhms
Resistance - Post Trip (R1) (Max)	150 mOhms	150 mOhms	165 mOhms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	2920 (7351 Metric)	2920 (7351 Metric), Concave	2-SMD
Size / Dimension	0.290" L x 0.202" W (7.36mm x 5.12mm)	0.290" L x 0.202" W (7.36mm x 5.12mm)	0.343" L x 0.250" W (8.70mm x 6.36mm)
Thickness (Max)	0.035" (0.90mm)	0.035" (0.90mm)	0.118" (3.00mm)
Approval Agency	cURus, TUV	AEC-Q200, cURus, TUV	CSA, TUV, UL
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant
Inventory Status	1627 Pcs (Obsolete)	2300 Pcs (Active)	4740 Pcs (Active)

Engineering Selection Recommendations

0ZCF0185FF2C is the primary substitute for the 0ZCD0185FF2C. Both parts are manufactured by Bel Fuse Inc. and share identical electrical specifications, including voltage rating, hold current, trip current, and resistance characteristics. The 0ZCF0185FF2C maintains the same 2920 package footprint with concave geometry and identical thickness. This part carries active product status with expanded approvals including AEC-Q200 certification and ROHS3 compliance, providing superior long-term availability and regulatory alignment.

SMD185F-2 is a secondary substitute manufactured by Littelfuse Inc. under the PolySwitch® product line. While it meets the core voltage and hold current requirements, it differs in package dimensions (2-SMD vs. 2920), increased thickness (3.00mm vs. 0.90mm), higher initial resistance (65 mOhms vs. 40 mOhms), and extended trip time (5 s vs. 2.5 s). This part is suitable only when PCB layout accommodates the larger footprint and when the extended response time is acceptable for the application. The SMD185F-2 carries broader agency approvals including CSA and UL certification.

Frequently Asked Questions (FAQ)

Q: Can the 0ZCF0185FF2C be used as a direct replacement for the 0ZCD0185FF2C?

A: Yes. Both parts share identical electrical ratings (33V, 1.85A hold current, 3.7A trip current), matching resistance specifications, and the same 2920 package footprint. The 0ZCF0185FF2C is the recommended substitute due to active product status and enhanced certifications.

Q: What are the key differences between 0ZCF0185FF2C and SMD185F-2?

A: The primary differences are package type (2920 vs. 2-SMD), physical dimensions, trip response time (2.5s vs. 5s), and initial resistance (40 mOhms vs. 65 mOhms). Both maintain the required 33V voltage and 1.85A hold current ratings. Package selection depends on PCB layout constraints and application timing requirements.

Q: Is the SMD185F-2 suitable for applications requiring fast response time?

A: The SMD185F-2 has a 5-second trip time compared to 2.5 seconds for the 0ZCD0185FF2C and 0ZCF0185FF2C. Applications requiring the faster 2.5-second response should use the 0ZCF0185FF2C. The SMD185F-2 is appropriate for applications where extended response time is acceptable.

Q: What compliance certifications should I consider when selecting a substitute?

A: The 0ZCF0185FF2C includes AEC-Q200 automotive qualification and ROHS3 compliance, making it suitable for automotive and regulated environments. The SMD185F-2 carries CSA, TUV, and UL approvals. Select based on your application's regulatory requirements and industry standards.

Q: Are there package footprint compatibility concerns?

A: The 0ZCF0185FF2C maintains the identical 2920 footprint as the original part and requires no PCB layout changes. The SMD185F-2 uses a 2-SMD package with larger dimensions (8.70mm x 6.36mm vs. 7.36mm x 5.12mm) and significantly greater thickness (3.00mm vs. 0.90mm), requiring PCB redesign for compatibility.

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