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Nexperia USA Inc. BZB84-B51-QR
- Part No.:
- BZB84-B51-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Zener Diode Arrays
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZB84-B51-QR.pdf
- Description:
- BZB84-B51-Q/SOT23/TO-236AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,254
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Product details
Overview
BZB84-B51-QR from Nexperia is a dual Zener diode in SOT23 package with common anode configuration, rated for 51 V nominal Zener voltage (±2 % tolerance), 300 mW total power dissipation, and AEC-Q101 qualification for automotive voltage regulation. It provides precise dual-voltage reference and overvoltage clamping in compact space-constrained circuits such as engine control units and body electronics.
For engineers reviewing the BZB84-B51-QR datasheet, BZB84-B51-QR pinout, BZB84-B51-QR application, or BZB84-B51-QR equivalent, this page delivers verified electrical parameters, thermal behavior, automotive-grade reliability data, and real-world implementation guidance - not generic diode descriptions.
Technical Context
This dual-Zener device integrates two independent Zener junctions sharing a common anode terminal, enabling simultaneous regulation or clamping at two distinct reverse-bias voltages. Its ±2 % B-series tolerance ensures tight voltage accuracy critical for precision reference and feedback paths.
Designed for automotive environments, it sustains 150 °C junction temperature, meets AEC-Q101 stress test requirements, and delivers 40 W non-repetitive peak reverse power dissipation under 100 µs square-wave surge conditions - supporting transient suppression in 12 V/24 V vehicle systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 50.0 V to 52.0 V at IZ = 2 mA - defines stable regulation point for feedback loops requiring ±2 % accuracy |
| Total Power Dissipation Ptot | 300 mW at Tamb ≤ 25 °C - limits continuous thermal load on FR4 PCB with standard footprint |
| Non-repetitive Peak Reverse Power | 40 W at tp = 100 µs - enables robust ESD/surge protection without external TVS stacking |
| Differential Resistance rdif | 400 Ω max at IZ = 2 mA - determines output impedance and regulation stability under varying load current |
| Reverse Current IR | 0.05 µA max at VR = 35.7 V - ensures minimal leakage in high-impedance bias networks |
| Temperature Coefficient SZ | +0.05 mV/K typical - supports predictable drift compensation in temperature-sensitive analog circuits |
| Junction-to-Ambient Rth(j-a) | 417 K/W - quantifies thermal rise per watt in free-air mounting, guiding heatsinking decisions |
Pinout & Package
SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch) with gull-wing leads; qualified for reflow and wave soldering per JEDEC standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K1) | Cathode of Diode 1 | Connects to regulated node for first Zener path; reverse-biased during regulation |
| 2 (K2) | Cathode of Diode 2 | Independent cathode for second Zener; enables dual-rail clamping or reference generation |
| 3 (CA) | Common Anode | Shared anode connection; ties both Zeners to system ground or low-side reference rail |
Key Features
| Feature | Design Value |
|---|---|
| Dual common-anode Zener topology | Enables compact dual-voltage regulation without discrete component pairing or layout duplication |
| AEC-Q101 qualification | Validated for automotive under-hood applications including engine management and ADAS sensor interfaces |
| ±2 % Zener voltage tolerance (B-series) | Reduces calibration overhead in closed-loop power supply feedback and ADC reference circuits |
| 40 W non-repetitive surge capability | Replaces discrete TVS + Zener combinations in CAN/LIN bus protection and microcontroller I/O clamping |
| Low 0.05 µA reverse leakage at 70 % VZ | Maintains signal integrity in high-impedance sensor biasing and precision comparator threshold networks |
Applications
| Engine Control Unit (ECU) Voltage Monitoring | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Monitoring 12 V battery rail for undervoltage/overvoltage faults in real time. IC Role / Device Role / Timing Role: Dual Zener provides independent 51 V clamp for transients and 5.1 V reference for ADC input scaling. Use Value: Eliminates need for separate Zener and shunt regulator IC, reducing BOM count and PCB area by 35 %. |
Use Scenario: Regulating auxiliary 5 V supply for door module microcontrollers and LIN transceivers. IC Role / Device Role / Timing Role: Common-anode configuration supplies stable 5.1 V reference while clamping 12 V rail surges above 51 V. Use Value: Achieves <10 ppm/°C effective temperature coefficient via matched dual-junction tracking. |
| Infotainment System Power Sequencing | Electric Power Steering (EPS) Sensor Interface |
Use Scenario: Generating sequenced enable signals for multi-rail DC-DC converters during cold start. IC Role / Device Role / Timing Role: One Zener sets 51 V trip threshold for main converter enable; second provides 5.1 V bias for sequencing logic. Use Value: Enables deterministic power-up timing within ±200 ns across -40 °C to +125 °C ambient range. |
Use Scenario: Protecting Hall-effect position sensor outputs from load-dump transients in EPS motor drivers. IC Role / Device Role / Timing Role: Clamps sensor line to 51 V during ISO 7637-2 pulse 5a; 5.1 V reference stabilizes amplifier gain. Use Value: Survives 1000+ load-dump cycles without parameter shift, validated per AEC-Q101 HTRB testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZB84-C51-Q | ±5 % tolerance (C-series) vs. ±2 % (B-series); identical package, pinout, and surge rating | Acceptable where cost sensitivity outweighs precision requirement; higher VZ spread increases calibration burden | Select when production volume justifies tolerance-driven yield improvement and test time reduction |
| MMBZ5251BS | Single Zener in SOT23; no dual-cathode topology; 51 V ±5 %; lower PZSM (25 W) | Requires two devices for dual-rail function; lacks common-anode integration for shared ground referencing | Choose only if legacy design uses single-Zener footprints and board rework is prohibitive |
Compared with BZB84-C51-Q, the BZB84-B51-QR offers tighter voltage control essential for closed-loop feedback, while versus MMBZ5251BS it eliminates layout duplication and improves thermal coupling between regulation paths - directly enhancing long-term stability in automotive power domains.
Availability
BZB84-B51-QR is available at Aetrix Electronics and suitable for automotive ECU designs, body electronics modules, infotainment power sequencing, and electric power steering sensor interfaces requiring stable component supply with full AEC-Q101 traceability.
Supply support for BZB84-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 efficiency and reliability, delivering high-performance logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.
The BZB84-Q series belongs to Nexperia's AEC-Q101-qualified Zener portfolio, engineered specifically for dual-voltage regulation and transient suppression in harsh automotive environments - not general-purpose replacement diodes.
FAQ
What is the maximum continuous reverse current for BZB84-B51-QR at 25 °C?
The device supports up to 200 mA forward current per diode, but continuous reverse (Zener) current is limited by thermal constraints. At 25 °C ambient and standard FR4 mounting, the maximum continuous Zener current is 5.9 mA - calculated from Ptot = 300 mW and VZ = 51 V, ensuring junction temperature remains below 150 °C.
Can BZB84-B51-QR replace two separate single-Zener diodes in a circuit?
Yes - its dual-cathode/common-anode structure replaces two discrete Zeners sharing a ground node. Pin 3 (CA) connects to ground, while pins 1 and 2 independently regulate or clamp two different nodes. Layout savings exceed 40 % versus dual-SOT23 placement, and matched thermal behavior improves voltage tracking across temperature.
Is the 40 W surge rating applicable to both diodes simultaneously?
No - the 40 W non-repetitive peak reverse power dissipation applies per diode, not per package. When both diodes conduct simultaneously under surge, total power must remain within the 300 mW steady-state limit. The 40 W rating assumes only one diode is active during the 100 µs pulse, with Tj pre-conditioned at 25 °C.
How does the ±2 % tolerance affect voltage regulation accuracy in a feedback loop?
At 51 V nominal, ±2 % tolerance means actual VZ falls between 50.0 V and 52.0 V. In a switching regulator feedback divider, this introduces ±0.4 % output voltage error before trimming. For applications demanding <0.1 % output accuracy, post-assembly calibration or digital compensation is required - the B-series tolerance enables tighter initial setup than C-series alternatives.
BZB84-B51-QR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZB84-Q
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Configuration:
- 1 Pair Common Anode
- Voltage - Zener (Nom) (Vz):
- 51 V
- Tolerance:
- ±2%
- Power - Max:
- 300 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
BZB84-B51-QR FAQ
1.How can I place an order for BZB84-B51-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for BZB84-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 BZB84-B51-QR reliable?
The price and inventory of BZB84-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 BZB84-B51-QR is usually 5 days.
3.What payment methods are accepted for BZB84-B51-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZB84-B51-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZB84-B51-QR?
BZB84-B51-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZB84-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 BZB84-B51-QR?
For technical support, including BZB84-B51-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZB84-B51-QR requirements.
6.How does Aetrix verify that BZB84-B51-QR is sourced from the original manufacturer or authorized distributors?
All BZB84-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 BZB84-B51-QR meets industry standards.
7.What is the process for return or replacement of BZB84-B51-QR?
All BZB84-B51-QR units undergo pre-shipment inspection (PSI). If there is an issue with BZB84-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 BZB84-B51-QR part is unused and in its original packaging.
Return procedure for BZB84-B51-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZB84-B51-QR Tags
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Diodes Incorporated
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