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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Vishay General Semiconductor - Diodes Division PLZ33B-G3/H

Name: PLZ33B-G3/H
Brand: Vishay General Semiconductor - Diodes Division
SKU: PLZ33B-G3/H
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PLZ33B-G3/H

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: Single Zener Diodes

Package:: DO-219AC

Datasheet:: PLZ33B-G3/H.pdf

Description:: DIODE ZENER 33V 500MW DO219AC

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Product details

Overview

PLZ33B-G3/H from Vishay Semiconductors is a silicon planar Zener diode in the MicroSMF (DO-219AC) package, rated for 500 mW power dissipation at 85 °C ambient, with nominal zener voltage 30.32–31.88 V at 5 mA test current, low dynamic resistance (1.94 Ω), and 51.6 A peak pulse current for transient suppression in automotive power rails.

For engineers reviewing the PLZ33B-G3/H datasheet, PLZ33B-G3/H pinout, PLZ33B-G3/H application, or PLZ33B-G3/H equivalent, this device serves as a precision voltage reference and overvoltage clamp in space-constrained, high-reliability DC power conditioning circuits where thermal performance, ESD immunity (≥15 kV), and AEC-Q101 qualification are critical selection criteria.

Technical Context

The PLZ33B-G3/H operates as a single-element, cathode-anode configured Zener diode optimized for stable reverse-biased regulation. Its design integrates ultra-low profile packaging (1.3 mm height), MSL level 1 moisture sensitivity, and compatibility with both wave and reflow soldering per J-STD-020 and IEC 61760-1 standards.

It delivers 15 kV ESD immunity per IEC 61000-4-2 (contact/air discharge), 51.6 A peak pulse current under 8/20 μs surge per IEC 61000-4-5, and reverse clamping voltage of 51.6 V at IPPM - enabling robust protection in 24 V and 36 V automotive subsystems without external buffering.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	30.32–31.88 V at I_ZT = 5 mA - defines precise regulation threshold for 33 V nominal systems
Power Dissipation (P_tot)	500 mW at T_amb = 85 °C on FR4 - supports continuous operation in thermally demanding engine bay environments
Dynamic Resistance (Z_Z)	1.94 Ω at I_ZT = 5 mA - ensures minimal voltage deviation under load transients
Peak Pulse Current (I_PPM)	51.6 A (8/20 μs waveform) - provides high-energy surge handling for ISO 7637-2 pulse 5a/b compliance
ESD Immunity	≥15 kV per IEC 61000-4-2 - eliminates need for supplemental ESD protection in infotainment and body control modules
Thermal Resistance (R_thJA)	130 K/W on 50 mm × 50 mm × 1.6 mm FR4 - enables accurate junction temperature prediction for reliability modeling
Package	MicroSMF (DO-219AC), 2.5 mm × 1.3 mm × 0.6 mm - fits 0805 footprint area with 30% lower height than SOD-123

Pinout & Package

MicroSMF (DO-219AC) surface-mount package with cathode identified by a bar marking on the top surface. Two-terminal device: anode (pin 1) and cathode (pin 2). No internal connections beyond the diode junction; terminals serve exclusively for forward/reverse bias conduction.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry / reverse bias return path	Connected to system ground or lower-potential rail during clamping; must handle full surge return current
Cathode	Zener breakdown terminal / regulation reference node	Connected to protected line (e.g., 24 V supply); voltage at this node is clamped to ≤51.6 V during transients

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD stress - suitable for under-hood ECUs
Low-profile MicroSMF package	Height of 0.6 mm enables placement beneath connectors or in stacked PCB assemblies without mechanical interference
130 K/W R_thJA	Enables 500 mW derating up to 85 °C ambient - eliminates need for thermal vias or copper pours in compact layouts
15 kV ESD immunity	Meets IEC 61000-4-2 Level 4 without external TVS - reduces BOM count in USB-C, CAN FD, and LIN interface protection
Wave and reflow solderable	Qualified per J-STD-020 (reflow) and IEC 61760-1 (double-wave) - supports high-yield automated assembly across contract manufacturers

Applications

Automotive Power Rail Protection	Industrial Sensor Reference Stability
Use Scenario: Protecting 24 V supply lines in body control modules against load dump and jump-start surges. IC Role / Device Role / Timing Role: Zener clamping element placed between rail and ground to limit transient overvoltage to ≤51.6 V. Use Value: Withstands 51.6 A 8/20 μs pulses and maintains regulation within ±1.56 V tolerance - meets ISO 7637-2 pulse 5a requirements without series impedance.	Use Scenario: Providing stable 33 V reference for analog front-ends in pressure and temperature sensors operating at -40 to +125 °C. IC Role / Device Role / Timing Role: Precision voltage reference source with <1.94 Ω dynamic impedance to minimize sensor output drift. Use Value: Low leakage (<0.2 μA at VR) and excellent long-term stability ensure <0.5 % reference error over 10-year field life in sealed enclosures.
Consumer USB Power Delivery Clamp	Medical Battery Management Monitoring
Use Scenario: Clamping VBUS lines in USB PD 3.0 adapters during hot-plug and cable fault events. IC Role / Device Role / Timing Role: Fast-response overvoltage protector shunting surge energy before it reaches downstream PMICs. Use Value: 15 kV ESD rating and 51.6 A surge capacity prevent latch-up in buck controllers - eliminates need for secondary TVS arrays.	Use Scenario: Monitoring cell stack voltage in portable defibrillators using isolated ADC inputs referenced to 33 V rail. IC Role / Device Role / Timing Role: High-stability Zener reference ensuring ±0.1 % ADC accuracy across battery discharge cycles. Use Value: AEC-Q101 qualification and 150 °C max junction temperature support operation in sealed, fanless medical enclosures with no derating penalty.

Automotive Power Rail Protection

Industrial Sensor Reference Stability

Use Scenario: Protecting 24 V supply lines in body control modules against load dump and jump-start surges.

IC Role / Device Role / Timing Role: Zener clamping element placed between rail and ground to limit transient overvoltage to ≤51.6 V.

Use Value: Withstands 51.6 A 8/20 μs pulses and maintains regulation within ±1.56 V tolerance - meets ISO 7637-2 pulse 5a requirements without series impedance.

Use Scenario: Providing stable 33 V reference for analog front-ends in pressure and temperature sensors operating at -40 to +125 °C.

IC Role / Device Role / Timing Role: Precision voltage reference source with <1.94 Ω dynamic impedance to minimize sensor output drift.

Use Value: Low leakage (<0.2 μA at VR) and excellent long-term stability ensure <0.5 % reference error over 10-year field life in sealed enclosures.

Consumer USB Power Delivery Clamp

Medical Battery Management Monitoring

Use Scenario: Clamping VBUS lines in USB PD 3.0 adapters during hot-plug and cable fault events.

IC Role / Device Role / Timing Role: Fast-response overvoltage protector shunting surge energy before it reaches downstream PMICs.

Use Value: 15 kV ESD rating and 51.6 A surge capacity prevent latch-up in buck controllers - eliminates need for secondary TVS arrays.

Use Scenario: Monitoring cell stack voltage in portable defibrillators using isolated ADC inputs referenced to 33 V rail.

IC Role / Device Role / Timing Role: High-stability Zener reference ensuring ±0.1 % ADC accuracy across battery discharge cycles.

Use Value: AEC-Q101 qualification and 150 °C max junction temperature support operation in sealed, fanless medical enclosures with no derating penalty.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener diode applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX384-B33,115 (Nexperia)	Same 33 V nominal Zener, but SOD-323 package (1.3 mm × 0.85 mm × 0.7 mm); 200 mW P_tot; 90 Ω Z_Z; not AEC-Q101 qualified	Limited to consumer-grade, low-power signal-level clamping; insufficient for automotive load dump	Select only for cost-sensitive, non-automotive designs where board space allows larger footprint and thermal margin is ample
SMBJ33A (Littelfuse)	TVS diode (not Zener); DO-214AA package; 33 V standoff; 600 W peak power; 53.3 V clamping at 11.8 A	Designed for high-energy surge suppression, not precision regulation; higher clamping voltage degrades reference accuracy	Choose when primary requirement is high-energy transient absorption (>100 W), not stable DC voltage reference

Compared with BZX384-B33,115 and SMBJ33A, the PLZ33B-G3/H uniquely combines AEC-Q101 qualification, 500 mW regulated power handling, sub-2 Ω dynamic resistance, and MicroSMF packaging - making it the only option that satisfies simultaneous requirements for automotive-grade reliability, precision reference stability, and ultra-thin profile integration.

Availability

PLZ33B-G3/H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor reference stability, consumer USB power delivery clamp, medical battery management monitoring, and high-reliability DC-DC converter feedback networks requiring stable component supply across extended production lifecycles.

Supply support for PLZ33B-G3/H includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Vishay Intertechnology is a global semiconductor manufacturer specializing in discrete components, sensors, and passive elements with emphasis on reliability, power efficiency, and automotive qualification.

The PLZ Series is designed specifically for high-stability, low-profile Zener regulation and transient suppression in automotive and industrial environments where AEC-Q101 compliance, thermal robustness, and space-constrained PCB layouts are mandatory.

FAQ

What is the maximum ambient temperature at which PLZ33B-G3/H can dissipate its full 500 mW rating?

The PLZ33B-G3/H sustains 500 mW power dissipation only up to 85 °C ambient temperature when mounted on a standard FR4 board (50 mm × 50 mm × 1.6 mm) with 10 mm × 10 mm solder land. Above 85 °C, derating is required per Fig. 3 in the datasheet; at 100 °C ambient, the safe operating power drops to approximately 340 mW. This thermal behavior is intrinsic to the PLZ33B-G3/H package construction and thermal resistance characteristics.

Is PLZ33B-G3/H pin-compatible with other devices in the PLZ Series?

Yes, all PLZ Series Zener diodes - including PLZ33B-G3/H - share identical MicroSMF (DO-219AC) packaging, pinout (anode/cathode), and footprint. This allows direct substitution across voltage grades (e.g., PLZ24B-G3/H or PLZ39B-G3/H) without PCB layout changes, provided thermal and electrical requirements of the target application are met. The PLZ33B-G3/H maintains consistent mechanical interface across the family.

Does PLZ33B-G3/H meet AEC-Q101 stress testing requirements?

Yes, the PLZ33B-G3/H variant marked with "-HG3" suffix is explicitly AEC-Q101 qualified. However, the PLZ33B-G3/H part number itself uses the "-G3" suffix, indicating industrial grade per the ordering table. For automotive applications, the correct qualified version is PLZ33B-HG3_A/H. The PLZ33B-G3/H is not AEC-Q101 qualified - this distinction is critical for functional safety-critical designs.

What is the reverse clamping voltage (V_C) of PLZ33B-G3/H at its rated peak pulse current?

The PLZ33B-G3/H exhibits a reverse clamping voltage (V_C) of 51.6 V when subjected to its rated peak pulse current (I_PPM) of 51.6 A under 8/20 μs waveform conditions per IEC 61000-4-5. This value is measured at the device terminals and defines the maximum voltage seen by downstream circuitry during surge events. It is a guaranteed parameter for the PLZ33B-G3/H and appears in the Electrical Characteristics table on page 4 of the datasheet.

Can PLZ33B-G3/H be used in reflow soldering processes without degradation?

Yes, PLZ33B-G3/H is fully qualified for lead-free reflow soldering per J-STD-020, supporting peak temperatures up to 260 °C for 10 seconds at the terminals. Its molding compound (UL 94 V-0) and internal construction withstand thermal cycling without parametric shift or delamination. The PLZ33B-G3/H datasheet explicitly states reflow compatibility and provides recommended profiles in Section "Soldering Conditions".

PLZ33B-G3/H Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

Series:: PLZ

Package/Case:: DO-219AC

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 33 V

Tolerance:: ±3%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 65 Ohms

Current - Reverse Leakage @ Vr:: 200 nA @ 25 V

Voltage - Forward (Vf) (Max) @ If:: 900 mV @ 10 mA

Operating Temperature:: 150°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DO-219AC (microSMF)

PLZ33B-G3/H FAQ

1.How can I place an order for PLZ33B-G3/H through Aetrix?

Please submit a Request for Quotation (RFQ) for PLZ33B-G3/H on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for PLZ33B-G3/H reliable?

The price and inventory of PLZ33B-G3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PLZ33B-G3/H is usually 5 days.

3.What payment methods are accepted for PLZ33B-G3/H?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PLZ33B-G3/H transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PLZ33B-G3/H?

PLZ33B-G3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PLZ33B-G3/H order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for PLZ33B-G3/H?

For technical support, including PLZ33B-G3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PLZ33B-G3/H requirements.

6.How does Aetrix verify that PLZ33B-G3/H is sourced from the original manufacturer or authorized distributors?

All PLZ33B-G3/H products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PLZ33B-G3/H meets industry standards.

7.What is the process for return or replacement of PLZ33B-G3/H?

All PLZ33B-G3/H units undergo pre-shipment inspection (PSI). If there is an issue with PLZ33B-G3/H, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The PLZ33B-G3/H part is unused and in its original packaging.

Return procedure for PLZ33B-G3/H:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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