Polymeric PTC Resettable Fuse 0ZCD0075FF2C Equivalent & Substitute Parts

Part Overview

The 0ZCD0075FF2C is a polymeric PTC resettable fuse manufactured by Bel Fuse Inc., rated for 33V maximum voltage with 750 mA hold current in a 2920 surface mount package. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. Polymeric PTC resettable fuses provide automatic overcurrent protection by increasing resistance when current exceeds trip thresholds, then resetting when the fault condition clears.

Key Parameters

Parameter	Value
Voltage - Max	33V
Current - Hold (Ih) (Max)	750 mA
Current - Trip (It)	1.5 A
Resistance - Initial (Ri) (Min)	180 mOhms
Resistance - Post Trip (R1) (Max)	1 Ohms
Operating Temperature Range	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	2920 (7351 Metric)
Time to Trip	300 ms
Approval Agency	cURus, TUV

Substitute Part Grouping Explanation

Substitution eligibility for the 0ZCD0075FF2C is determined by the following critical parameters: maximum voltage rating (33V), hold current (750 mA), trip current (1.5 A), time to trip (300 ms), initial resistance (180 mOhms minimum), and post-trip resistance (1 Ohm maximum). Surface mount mounting type and operating temperature range (-40°C ~ 85°C) are also required for direct substitution.

Parts are classified into two categories:

Direct Substitutes maintain all critical electrical parameters and package compatibility. These parts can replace the 0ZCD0075FF2C without circuit redesign.

Similar Substitutes share the same voltage rating and package form factor but differ in hold current or trip current specifications. These require circuit evaluation before implementation.

Parameter Comparison

Parameter	0ZCD0075FF2C (Main)	0ZCF0075FF2C (Direct)	MF-SM075-2 (Direct)	SMD075F-2 (Direct)	2920L150DR (Similar)
Manufacturer	Bel Fuse Inc.	Bel Fuse Inc.	Bourns Inc.	Littelfuse Inc.	Littelfuse Inc.
Voltage - Max	33V	33V	30V	30V	33V
Current - Hold (Ih) (Max)	750 mA	750 mA	750 mA	750 mA	1.5 A
Current - Trip (It)	1.5 A	1.5 A	1.5 A	1.5 A	3 A
Current - Max	40 A	100 A	80 A	40 A	40 A
Time to Trip	300 ms	300 ms	300 ms	300 ms	2 s
Resistance - Initial (Ri) (Min)	180 mOhms	180 mOhms	230 mOhms	350 mOhms	80 mOhms
Resistance - Post Trip (R1) (Max)	1 Ohms	1 Ohms	1 Ohms	1 Ohms	230 mOhms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	2920 (7351 Metric)	2920 (7351 Metric), Concave	2-SMD	2-SMD	2920 (7351 Metric), Concave
Product Status	Obsolete	Active	Active	Active	Active
Approval Agency	cURus, TUV	AEC-Q200, cURus, TUV	cURus, TUV	CSA, TUV, UL	cURus, TUV

Engineering Selection Recommendations

0ZCF0075FF2C is the primary direct substitute. Manufactured by Bel Fuse Inc. in the same series, it maintains identical electrical specifications (33V, 750 mA hold, 1.5 A trip, 300 ms response) and package form factor. The part is active in production with AEC-Q200 automotive qualification and ROHS3 compliance, providing superior long-term availability compared to the obsolete 0ZCD0075FF2C.

MF-SM075-2 (Bourns Multifuse®) and SMD075F-2 (Littelfuse PolySwitch®) are direct electrical equivalents with identical hold and trip current specifications. Both operate at 30V maximum voltage, which is acceptable for 33V-rated circuits with appropriate design margin verification. MF-SM075-2 offers superior moisture sensitivity (MSL 1 vs. 2A) and lower time-to-trip variability. SMD075F-2 provides broader approval agency coverage (CSA, TUV, UL).

2920L150DR is a similar substitute only when circuit design permits higher hold current (1.5 A vs. 750 mA) and trip current (3 A vs. 1.5 A). The extended time-to-trip specification (2 s vs. 300 ms) makes this part unsuitable for applications requiring fast fault response. This part is appropriate only for circuits designed to tolerate higher trip thresholds.

Frequently Asked Questions (FAQ)

Q: Can I use 0ZCF0075FF2C as a direct replacement for 0ZCD0075FF2C?

A: Yes. The 0ZCF0075FF2C is a direct substitute with identical electrical parameters (33V, 750 mA hold current, 1.5 A trip current, 300 ms response time) and the same 2920 package footprint. The primary difference is product status (active vs. obsolete) and enhanced certifications (AEC-Q200 added).

Q: What is the difference between direct and similar substitutes?

A: Direct substitutes maintain all critical electrical parameters: voltage rating, hold current, trip current, and response time. Similar substitutes share the same voltage and package but differ in hold or trip current specifications, requiring circuit evaluation before use.

Q: Can MF-SM075-2 replace 0ZCD0075FF2C in a 33V circuit?

A: MF-SM075-2 is rated for 30V maximum voltage. In a 33V circuit, this creates a 3V overvoltage condition. Substitution is not recommended without circuit redesign to reduce operating voltage or addition of voltage limiting components.

Q: Why does 2920L150DR have different hold and trip currents?

A: The 2920L150DR is designed for different overcurrent protection thresholds (1.5 A hold vs. 750 mA, 3 A trip vs. 1.5 A). This part is suitable only for circuits where these higher thresholds are acceptable. The extended 2-second time-to-trip also differs from the 300 ms specification of the main part.

Q: What packaging differences exist between these substitutes?

A: The 0ZCD0075FF2C, 0ZCF0075FF2C, and 2920L150DR use the 2920 (7351 Metric) package. The MF-SM075-2 and SMD075F-2 use 2-SMD packages with different footprint dimensions. PCB layout verification is required when switching between 2920 and 2-SMD packages.

Q: Which substitute offers the best long-term availability?

A: The 0ZCF0075FF2C offers the highest inventory levels (25,535 pcs) and active production status. SMD075F-2 (19,408 pcs) and 2920L150DR (47,729 pcs) also provide strong availability. All three are preferable to the obsolete 0ZCD0075FF2C.

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