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Nexperia USA Inc. PZU84-B51-QR
- Part No.:
- PZU84-B51-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
PZU84-B51-QR.pdf
- Description:
- DIODE ZENER 51V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,144
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Product details
Overview
PZU84-B51-QR from Nexperia is a 51 V ±2 % tolerance Zener voltage regulator diode in SOT23 package, designed for precision voltage reference and overvoltage protection in automotive power rails. It delivers 250 mW total power dissipation, 40 W non-repetitive peak reverse power, and exhibits 400 Ω differential resistance at IZ = 2 mA with a temperature coefficient of +35.7 mV/K at nominal working current.
For engineers reviewing the PZU84-B51-QR datasheet, PZU84-B51-QR pinout, PZU84-B51-QR application, or PZU84-B51-QR equivalent, this device is selected for stable 51 V clamping in engine control units, battery management systems, and ADAS sensor supply regulation where AEC-Q101 qualification, low leakage, and hard breakdown knee are critical.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain a stable 51 V reference across load variations. Its ±2 % tolerance and 400 Ω dynamic impedance at 2 mA ensure tight regulation under low-current bias conditions typical in sensing and monitoring circuits.
The device features a hard breakdown knee and low leakage current (<0.05 μA at VR = 51 V), optimized for high-accuracy voltage referencing. Its thermal resistance from junction to ambient is 500 K/W on FR4 PCB, supporting reliable operation up to 150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 51 V nominal, ±2 % tolerance - ensures precise 48.96–53.04 V clamping window for safety-critical automotive voltage supervision. |
| Differential Resistance (rdif) | 400 Ω at IZ = 2 mA - maintains stable regulation under light-load conditions common in microcontroller reset circuits. |
| Temperature Coefficient (SZ) | +35.7 mV/K at IZ = 2 mA - enables predictable drift compensation in wide-temperature-range vehicle environments. |
| Reverse Current (IR) | <0.05 μA at VR = 51 V - minimizes standby power loss in always-on automotive modules. |
| Total Power Dissipation (Ptot) | 250 mW on FR4 PCB - supports continuous regulation in compact SMT layouts without forced cooling. |
| Non-repetitive Peak Power (PZSM) | 40 W at tp = 100 μs - provides robust transient surge suppression against load-dump events in 12 V/24 V systems. |
| Junction Temperature (Tj) | −55 °C to +150 °C - meets extended automotive temperature requirements for under-hood deployment. |
Pinout & Package
SOT23 plastic surface-mounted package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch, single-sided 70 μm copper FR4 mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node during regulation; must be held ≤51 V below cathode to avoid conduction. |
| 2 | Not Connected (n.c.) | Internally unconnected; no electrical function; must remain floating or grounded per layout best practices to avoid parasitic coupling. |
| 3 | Cathode (K) | Reverse-biased terminal; connects to higher-potential rail (e.g., battery+); defines regulated output reference point. |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables direct replacement in high-precision 51 V reference designs without recalibration or resistor trimming. |
| AEC-Q101 qualified | Validated for automotive-grade reliability including HTOL, TC, HAST, and ESD testing-suitable for ASIL-B system components. |
| Hard breakdown knee | Ensures sharp, predictable turn-on at 51 V with minimal voltage hysteresis-critical for accurate overvoltage lockout triggers. |
| Low leakage current (<0.05 μA) | Reduces quiescent current draw in always-on domains such as CAN transceiver bias networks and wake-up circuitry. |
| Optimized for fast switching noise reduction | Intentional minor leakage rise improves transient response and suppresses high-frequency ringing in switching regulator feedback paths. |
Applications
| Engine Control Unit (ECU) Voltage Supervision | Automotive Battery Management System (BMS) |
|---|---|
Use Scenario: Monitoring 12 V/24 V main rail integrity in gasoline/diesel ECUs to trigger safe shutdown during undervoltage or overvoltage faults. IC Role / Device Role / Timing Role: Zener clamp referenced to microcontroller ADC input or comparator threshold; provides analog voltage sense signal independent of LDO behavior. Use Value: 51 V rating accommodates 24 V system load-dump transients (ISO 7637-2 Pulse 5a), while ±2 % tolerance ensures fault detection within 0.5 V margin. |
Use Scenario: Stabilizing reference voltage for cell voltage measurement ICs in 12S–16S lithium-ion packs used in EV traction inverters and PHEV DC-DC converters. IC Role / Device Role / Timing Role: Precision shunt reference for 16-bit SAR ADCs sampling individual cell voltages; replaces external voltage dividers in high-accuracy stack monitoring. Use Value: 400 Ω rdif limits loading error to <0.1 LSB at 100 kΩ input impedance, enabling ±1 mV cell voltage resolution. |
| ADAS Camera Module Power Rail Protection | Infotainment Head Unit Reset Circuit |
Use Scenario: Clamping transient spikes on 5 V or 3.3 V imaging sensor supply lines caused by ESD or nearby RF switching noise. IC Role / Device Role / Timing Role: Fast-response shunt protector placed adjacent to image sensor IC; absorbs sub-μs surges before they propagate into analog front-end. Use Value: Hard breakdown knee and 40 W PZSM enable clamping of 8 kV contact ESD (IEC 61000-4-2) without degradation or latch-up. |
Use Scenario: Generating clean, temperature-stable reset voltage for application processors and display controllers during cold cranking (−40 °C to +105 °C). IC Role / Device Role / Timing Role: Reference element in RC-based power-on reset (POR) generator; sets threshold for brown-out detection logic. Use Value: +35.7 mV/K SZ allows predictable threshold shift across temperature, eliminating need for complex compensation in POR timing design. |
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-C51 | ±5 % tolerance, 500 Ω rdif at 5 mA, no AEC-Q101 qualification | Acceptable for non-automotive industrial controls but lacks automotive reliability validation and tighter regulation. | Select only for cost-sensitive consumer electronics where ±5 % tolerance and absence of automotive qualification are acceptable. |
| MMSZ5257B | ±5 % tolerance, 150 Ω rdif at 20 mA, 500 mW Ptot, AEC-Q101 qualified | Higher power handling but looser tolerance; better for high-current clamp, worse for precision reference. | Prefer when surge energy absorption dominates over voltage accuracy-e.g., alternator line protection rather than ADC reference. |
Compared with BZX84-C51 and MMSZ5257B, PZU84-B51-QR uniquely combines AEC-Q101 qualification, ±2 % tolerance, and low-current regulation capability-making it the only choice for automotive voltage references requiring both precision and qualification compliance.
Availability
PZU84-B51-QR is available at Aetrix Electronics and suitable for engine control units, battery management systems, and ADAS camera modules requiring stable component supply across automotive production lifecycles.
Supply support for PZU84-B51-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 high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and advanced packaging.
The PZU84-Q series belongs to Nexperia's AEC-Q101-qualified Zener regulator portfolio, engineered specifically for automotive voltage reference, overvoltage protection, and precision biasing in harsh-environment electronic control units.
FAQ
What is the maximum reverse voltage that PZU84-B51-QR can safely clamp in continuous operation?
The device is rated for continuous operation at its nominal Zener voltage of 51 V with ±2 % tolerance. Its absolute maximum reverse voltage is limited by the 250 mW total power dissipation rating on FR4 PCB. At 51 V, this corresponds to a maximum steady-state reverse current of 4.9 mA. Exceeding this current continuously risks thermal runaway and permanent damage.
Does PZU84-B51-QR require a series current-limiting resistor in all applications?
Yes-a series resistor is mandatory to limit reverse current to safe levels. For example, in a 60 V rail application, a minimum 1.85 kΩ resistor limits current to 4.9 mA at 51 V drop. The resistor value must be calculated based on worst-case input voltage, desired Zener current, and power derating above 25 °C ambient.
How does the "B" suffix in PZU84-B51-QR differ from "C" variants like PZU84-C51-Q?
The "B" suffix denotes the tighter ±2 % Zener voltage tolerance and optimized low-leakage, hard-knee characteristics for precision reference use. In contrast, "C" variants offer approximately ±5 % tolerance and slightly higher leakage for improved noise performance in switching applications, as documented in Application Note AN90031.
Can PZU84-B51-QR be used in parallel for higher power dissipation?
No-Zener diodes should not be paralleled due to mismatched breakdown voltages causing current hogging. Even with binning, thermal runaway risk remains high. For higher power needs, select a single higher-rated device (e.g., PZU120 series) or implement active regulation with a transistor-based shunt amplifier.
PZU84-B51-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):
- 51 V
- Tolerance:
- ±2%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 180 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 35.7 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-B51-QR FAQ
1.How can I place an order for PZU84-B51-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for PZU84-B51-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-B51-QR reliable?
The price and inventory of PZU84-B51-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-B51-QR is usually 5 days.
3.What payment methods are accepted for PZU84-B51-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PZU84-B51-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PZU84-B51-QR?
PZU84-B51-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PZU84-B51-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-B51-QR?
For technical support, including PZU84-B51-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PZU84-B51-QR requirements.
6.How does Aetrix verify that PZU84-B51-QR is sourced from the original manufacturer or authorized distributors?
All PZU84-B51-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-B51-QR meets industry standards.
7.What is the process for return or replacement of PZU84-B51-QR?
All PZU84-B51-QR units undergo pre-shipment inspection (PSI). If there is an issue with PZU84-B51-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-B51-QR part is unused and in its original packaging.
Return procedure for PZU84-B51-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PZU84-B51-QR Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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