PLZ33D-HG3_A/H Zener Diode Equivalent & Substitute Parts

Part Overview

The PLZ33D-HG3_A/H is a 33 V, 500 mW surface mount zener diode manufactured by Vishay General Semiconductor - Diodes Division. This component is classified as an active product and is designed for voltage regulation and protection applications in electronic circuits. The diode is packaged in DO-219AC (microSMF) format and is qualified to AEC-Q101 automotive standards.

Equivalent and substitute parts are necessary when the primary part number becomes unavailable due to inventory constraints, supply chain disruptions, or manufacturing discontinuation. All substitute parts listed maintain identical electrical and mechanical specifications, ensuring direct functional replacement without circuit redesign.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	33	V
Tolerance	±3	%
Power - Maximum	500	mW
Impedance (Maximum)	65	Ohms
Current - Reverse Leakage @ 25 V	200	nA
Voltage - Forward (Maximum) @ 10 mA	900	mV
Operating Temperature	150	°C
Package / Case	DO-219AC (microSMF)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

All substitute parts for the PLZ33D-HG3_A/H are classified as parametric equivalents. Substitution eligibility is determined by strict conformance to the following electrical and mechanical parameters:

Critical Substitution Parameters:

Voltage - Zener (Nominal): 33 V
Tolerance: ±3%
Power - Maximum: 500 mW
Impedance (Maximum): 65 Ohms
Current - Reverse Leakage @ 25 V: 200 nA
Voltage - Forward (Maximum) @ 10 mA: 900 mV
Operating Temperature: 150°C
Package / Case: DO-219AC (microSMF)
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

All substitute parts listed below meet these exact specifications and are manufactured by Vishay General Semiconductor - Diodes Division within the PLZ series. The substitutes differ only in internal design variants (indicated by suffix designations such as A, B, C, D and G3 or HG3_A) that do not affect electrical performance or mechanical compatibility.

Parameter Comparison

Part Number	Vz (V)	Tolerance (%)	Power (mW)	Zzt (Ohms)	Ir @ 25V (nA)	Vf @ 10mA (mV)	Temp (°C)	Package	Inventory (Pcs)
PLZ33D-HG3_A/H	33	±3	500	65	200	900	150	DO-219AC	1105
PLZ33A-G3/H	33	±3	500	65	200	900	150	DO-219AC	843
PLZ33A-HG3_A/H	33	±3	500	65	200	900	150	DO-219AC	1128
PLZ33B-G3/H	33	±3	500	65	200	900	150	DO-219AC	724
PLZ33B-HG3_A/H	33	±3	500	65	200	900	150	DO-219AC	1144
PLZ33C-HG3_A/H	33	±3	500	65	200	900	150	DO-219AC	934
PLZ33D-G3/H	33	±3	500	65	200	900	150	DO-219AC	1004

Engineering Selection Recommendations

All substitute parts listed are active products manufactured by Vishay General Semiconductor - Diodes Division and maintain identical electrical and mechanical specifications to the PLZ33D-HG3_A/H. Selection among these equivalents should be based on the following factors:

Product Status and Compliance: All substitute parts carry active product status and are ROHS3 compliant. Parts designated with the "HG3_A" suffix (PLZ33A-HG3_A/H, PLZ33B-HG3_A/H, PLZ33C-HG3_A/H) and the main part PLZ33D-HG3_A/H carry AEC-Q101 automotive qualification. Parts with the "G3" suffix (PLZ33A-G3/H, PLZ33B-G3/H, PLZ33D-G3/H) do not carry explicit automotive qualification in the provided specifications.

Inventory Availability: Current inventory levels vary across substitute parts. PLZ33B-HG3_A/H offers the highest availability at 1144 pieces, followed by PLZ33A-HG3_A/H at 1128 pieces. PLZ33B-G3/H has the lowest availability at 724 pieces.

Automotive Applications: For applications requiring AEC-Q101 qualification, select from: PLZ33D-HG3_A/H, PLZ33A-HG3_A/H, PLZ33B-HG3_A/H, or PLZ33C-HG3_A/H.

General-Purpose Applications: All seven parts are suitable for non-automotive applications where AEC-Q101 qualification is not required.

Frequently Asked Questions (FAQ)

Q: Can PLZ33D-HG3_A/H be directly replaced with PLZ33A-HG3_A/H?

A: Yes. Both parts share identical electrical parameters (33 V nominal zener voltage, ±3% tolerance, 500 mW power rating, 65 Ohms maximum impedance) and mechanical specifications (DO-219AC package, surface mount configuration). Both carry AEC-Q101 automotive qualification. Direct substitution is valid without circuit modification.

Q: What is the difference between parts with "G3" and "HG3_A" suffixes?

A: The suffix designations indicate internal design variants within the PLZ33 series. These variants do not affect the electrical performance or mechanical compatibility. All specified electrical parameters and package dimensions remain identical across all suffix variants.

Q: Are all substitute parts suitable for automotive applications?

A: Parts designated PLZ33D-HG3_A/H, PLZ33A-HG3_A/H, PLZ33B-HG3_A/H, and PLZ33C-HG3_A/H carry AEC-Q101 automotive qualification. Parts PLZ33A-G3/H, PLZ33B-G3/H, and PLZ33D-G3/H do not carry explicit automotive qualification in the provided specifications. For automotive applications, select only from the AEC-Q101 qualified variants.

Q: Can I use PLZ33B-G3/H as a substitute if the original specification calls for PLZ33D-HG3_A/H in an automotive circuit?

A: No. While PLZ33B-G3/H is electrically equivalent, it does not carry AEC-Q101 automotive qualification. For automotive applications, use only AEC-Q101 qualified variants: PLZ33D-HG3_A/H, PLZ33A-HG3_A/H, PLZ33B-HG3_A/H, or PLZ33C-HG3_A/H.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited), matching the compliance profile of the PLZ33D-HG3_A/H.

Q: What is the maximum operating temperature for these zener diodes?

A: All parts in this substitution group operate at a maximum temperature of 150°C.

Q: Can these parts be used interchangeably in the same PCB assembly?

A: Yes. All substitute parts use the identical DO-219AC (microSMF) package and surface mount configuration. They are mechanically and electrically interchangeable without PCB layout modifications.

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