1N4752A Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4752A is a 33 V, 1 W Zener diode manufactured by SMC Diode Solutions in a through-hole DO-41 axial package. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design and procurement requirements. Equivalent substitutes must maintain identical electrical specifications and mechanical compatibility to ensure direct replacement without circuit redesign.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	33	V
Tolerance	±5	%
Power - Maximum	1	W
Impedance (Maximum)	45	Ohms
Package / Case	DO-204AL, DO-41, Axial	—
Mounting Type	Through Hole	—
Operating Temperature	200	°C

Substitute Part Grouping Explanation

Substitution of the 1N4752A is based on strict equivalence of the following electrical and mechanical parameters:

Zener voltage: 33 V nominal with ±5% tolerance
Power dissipation rating: 1 W maximum
Dynamic impedance: 45 Ohms maximum
Package configuration: DO-41 through-hole axial
Operating temperature range: 200°C maximum
Mounting method: Through-hole PCB insertion

The BZV85-C33,133 manufactured by NXP USA Inc. satisfies all substitution criteria as an active product with identical rated specifications and package compatibility.

Parameter Comparison

Parameter	1N4752A (SMC)	BZV85-C33,133 (NXP)	Match
Voltage - Zener (Nom)	33 V	33 V	Yes
Tolerance	±5%	±5%	Yes
Power - Max	1 W	1 W	Yes
Impedance (Max)	45 Ohms	45 Ohms	Yes
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	Yes
Mounting Type	Through Hole	Through Hole	Yes
Operating Temperature	200°C	200°C	Yes
Product Status	Obsolete	Active	Substitute Available

Engineering Selection Recommendations

The BZV85-C33,133 is the direct equivalent substitute for the 1N4752A. Both components are classified under ECCN EAR99 and HTSUS 8541.10.0050, confirming regulatory alignment. The substitute part is manufactured by NXP USA Inc. and maintains active product status, ensuring long-term availability and supply chain continuity. All electrical parameters, mechanical dimensions, and thermal ratings are identical, permitting direct PCB substitution without circuit modification or performance degradation.

Frequently Asked Questions (FAQ)

Q: Can the BZV85-C33,133 be used as a direct replacement for the 1N4752A without PCB modification?

A: Yes. Both components share identical Zener voltage (33 V), power rating (1 W), impedance (45 Ohms maximum), and DO-41 through-hole package configuration. Direct substitution is supported without circuit redesign.

Q: What is the primary reason for substituting the 1N4752A?

A: The 1N4752A is classified as obsolete. The BZV85-C33,133 is an active product with equivalent specifications and assured long-term availability.

Q: Are there differences in reverse leakage current between these parts?

A: The 1N4752A specifies 5 µA @ 25.1 V, while the BZV85-C33,133 specifies 50 nA @ 23 V. Both values are within acceptable operating parameters for Zener diode applications. The lower leakage of the substitute represents improved performance characteristics.

Q: Do both parts operate at the same maximum temperature?

A: Yes. Both the 1N4752A and BZV85-C33,133 are rated for 200°C maximum operating temperature.

Q: Is the DO-41 package identical between both manufacturers?

A: Yes. Both components use the DO-204AL, DO-41 axial through-hole package, ensuring mechanical and electrical compatibility on existing PCBs.

Q: What is the tolerance specification for Zener voltage?

A: Both parts maintain ±5% tolerance on the 33 V nominal Zener voltage, ensuring consistent voltage regulation performance across production batches.

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