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

Nexperia USA Inc. PZU84-B33-QR

Name: PZU84-B33-QR
Brand: Nexperia USA Inc.
SKU: PZU84-B33-QR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PZU84-B33-QR

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: PZU84-B33-QR.pdf

Description:: DIODE ZENER 33V 250MW TO236AB

Quantity:: RFQ Add To RFQ list

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Inventory:6,634

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Product details

Overview

PZU84-B33-QR from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT23 package, rated for 33 V nominal breakdown voltage (31.0 V–35.0 V), 250 mW total power dissipation, and qualified to AEC-Q101 for automotive use. It delivers stable reference voltage in low-current regulation circuits such as ECU sensor biasing and CAN transceiver voltage clamping.

For engineers reviewing the PZU84-B33-QR datasheet, PZU84-B33-QR pinout, PZU84-B33-QR application, or PZU84-B33-QR equivalent, key selection criteria include its 250 mW power rating at 25 °C ambient, 25 Ω typical differential resistance at I_Z = 5 mA, −0.05 mV/K temperature coefficient, and AEC-Q101 qualification status for under-hood deployment.

Technical Context

This Zener diode operates in reverse-bias breakdown mode with a hard knee characteristic, optimized for precision voltage reference and overvoltage protection in automotive subsystems. Its 33 V nominal working voltage falls within the B-series variant, which features very low dynamic impedance and leakage current.

The device exhibits a typical differential resistance of 250 Ω at I_Z = 0.5 mA and 25 Ω at I_Z = 5 mA, with reverse current limited to ≤0.05 μA at V_R = 25.2 V (76 % of V_Z). Thermal resistance from junction to ambient is 500 K/W on standard FR4 PCB.

Key Specifications

Parameter	Value and Actual Design Meaning
Breakdown Voltage V_Z	31.0 V to 35.0 V at I_Z = 5 mA; provides stable 33 V reference with ±2 % tolerance
Differential Resistance r_dif	25 Ω (typ) at I_Z = 5 mA; ensures minimal output voltage variation under load changes
Reverse Current I_R	≤0.05 μA at V_R = 25.2 V; enables ultra-low quiescent power in always-on circuits
Total Power Dissipation P_tot	250 mW at T_amb = 25 °C on FR4 PCB; defines maximum continuous DC power handling
Junction Temperature T_j	−55 °C to +150 °C; supports operation in engine compartment and transmission control units
AEC-Q101 Qualification	Qualified per Stress Test Qualification for Discrete Semiconductors; validated for automotive reliability
Forward Voltage V_F	≤0.9 V at I_F = 10 mA; allows efficient forward conduction during transient clamping events

Pinout & Package

SOT23 plastic surface-mounted package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch, 3-terminal configuration with anode (Pin 1), not-connected (Pin 2), and cathode (Pin 3).

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Connected to lower-potential node in reverse-bias regulation; carries forward current during surge events
2	Not Connected (n.c.)	Internally unconnected; must remain floating-no PCB trace or solder joint permitted
3	Cathode (K)	Connected to regulated voltage rail; serves as reference output node in shunt regulator topology

Key Features

Feature	Design Value
±2 % V_Z tolerance	Enables tight voltage reference without post-production trimming in safety-critical automotive sensors
Hard breakdown knee	Ensures predictable, non-gradual transition into regulation-critical for accurate overvoltage detection
Ultra-low leakage (≤0.05 μA)	Minimizes standby current drain in battery-powered modules like door ECUs and LIN bus nodes
AEC-Q101 qualification	Validates robustness against thermal cycling, humidity, and mechanical shock per automotive standards
250 mW power rating	Supports sustained regulation in 12 V/24 V systems with up to ~7.6 mA average Zener current

Applications

Automotive Sensor Biasing

CAN Transceiver Clamping

Use Scenario: Providing stable 33 V bias to analog front-end circuitry in wheel speed or pressure sensors.

IC Role / Device Role / Timing Role: Shunt voltage reference regulating supply rail against battery fluctuations and load dump transients.

Use Value: Maintains ADC input accuracy across −40 °C to +125 °C ambient with <±0.5 % drift due to low SZ (−0.05 mV/K).

Use Scenario: Protecting high-speed CAN FD transceivers from ESD and ISO 7637-2 pulse 1/2/5a surges.

IC Role / Device Role / Timing Role: Fast-acting reverse-bias clamp limiting common-mode voltage excursions on CAN_H/CAN_L lines.

Use Value: Absorbs 40 W non-repetitive peak power (tp = 100 μs) without degradation, preserving signal integrity.

Engine Control Unit (ECU) Reference

Body Control Module (BCM) Voltage Monitoring

Use Scenario: Generating precise 33 V reference for microcontroller internal ADC calibration and PWM gate drive logic.

IC Role / Device Role / Timing Role: Primary voltage reference source feeding analog comparators and bandgap circuits.

Use Value: Delivers 25 Ω dynamic impedance at 5 mA, reducing sensitivity to supply ripple and improving ADC LSB stability.

Use Scenario: Monitoring 24 V battery rail health in commercial vehicle BCMs via resistive divider + comparator.

IC Role / Device Role / Timing Role: Precision shunt element defining upper threshold voltage for undervoltage/overvoltage alarms.

Use Value: Enables ±2 % trip-point accuracy across lifetime, meeting UNECE R100 functional safety requirements.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C33	±5 % tolerance, higher rdif (≈40 Ω), no AEC-Q101 qualification	Acceptable for industrial/non-automotive designs where cost > qualification	Select only if AEC-Q101 compliance and tighter tolerance are not required
MMSZ5257B	±5 % tolerance, 500 mW rating, TO-236AB package (larger footprint)	Higher power handling but incompatible SMT layout and thermal profile	Choose only when board space permits larger package and 500 mW dissipation is needed

Compared with BZX84-C33 and MMSZ5257B, PZU84-B33-QR offers superior automotive qualification, tighter ±2 % tolerance, and SOT23 compatibility-making it the sole choice for AEC-compliant 33 V reference designs requiring long-term stability and small form factor.

Availability

PZU84-B33-QR is available at Aetrix Electronics and suitable for automotive ECU design, CAN FD interface protection, and body electronics voltage monitoring requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for PZU84-B33-QR 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

Nexperia is a global semiconductor expert focused on essential efficiency-enhancing components, delivering high-performance, reliable, and scalable solutions for automotive, industrial, and consumer markets.

PZU84-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for precision voltage regulation and transient suppression in harsh automotive environments.

FAQ

What is the maximum non-repetitive peak reverse power the PZU84-B33-QR can handle?

The PZU84-B33-QR supports up to 40 W non-repetitive peak reverse power dissipation for 100 μs square-wave pulses at T_j = 25 °C prior to surge. This capability enables robust protection against ISO 7637-2 load-dump transients without permanent degradation.

Is Pin 2 electrically connected internally?

No-Pin 2 is explicitly designated "not connected" (n.c.) in the official Nexperia pinning diagram and must remain unconnected on the PCB. Soldering or routing to this terminal violates the device's internal construction and may cause malfunction or premature failure.

How does the temperature coefficient affect regulation accuracy at 125 °C ambient?

At 33 V nominal, the PZU84-B33-QR has a temperature coefficient of −0.05 mV/K. Over a 100 K rise from 25 °C to 125 °C, this results in ≈−5 mV drift-less than 0.015 % of V_Z, ensuring high-stability reference performance in under-hood applications.

Can PZU84-B33-QR replace older PZU84-B33 variants without layout changes?

Yes-PZU84-B33-QR maintains identical SOT23 package dimensions, pinout, and thermal footprint per Figure 9 and Figure 10 of the Rev. 4 datasheet. The "QR" suffix denotes tape-and-reel packaging with updated AEC-Q101 test reporting; electrical and mechanical compatibility is fully preserved.

PZU84-B33-QR Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: PZU84-Q

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

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

Tolerance:: ±2%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 40 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 25 V

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

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

PZU84-B33-QR FAQ

1.How can I place an order for PZU84-B33-QR through Aetrix?

Please submit a Request for Quotation (RFQ) for PZU84-B33-QR 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 PZU84-B33-QR reliable?

The price and inventory of PZU84-B33-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PZU84-B33-QR is usually 5 days.

3.What payment methods are accepted for PZU84-B33-QR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PZU84-B33-QR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PZU84-B33-QR?

PZU84-B33-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PZU84-B33-QR 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 PZU84-B33-QR?

For technical support, including PZU84-B33-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PZU84-B33-QR requirements.

6.How does Aetrix verify that PZU84-B33-QR is sourced from the original manufacturer or authorized distributors?

All PZU84-B33-QR 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 PZU84-B33-QR meets industry standards.

7.What is the process for return or replacement of PZU84-B33-QR?

All PZU84-B33-QR units undergo pre-shipment inspection (PSI). If there is an issue with PZU84-B33-QR, 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 PZU84-B33-QR part is unused and in its original packaging.

Return procedure for PZU84-B33-QR:

1.Submit a request within 90 days.

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

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