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Nexperia USA Inc. BZB84-B3V9-QR
- Part No.:
- BZB84-B3V9-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Zener Diode Arrays
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZB84-B3V9-QR.pdf
- Description:
- BZB84-B3V9-Q/SOT23/TO-236AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,404
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Product details
Overview
BZB84-B3V9-QR from Nexperia is a dual common-anode Zener diode in SOT23 package, providing precise 3.9 V voltage regulation with ±2 % tolerance, 300 mW total power dissipation, and AEC-Q101 qualification for automotive power rail stabilization and overvoltage clamping in engine control units.
For engineers reviewing the BZB84-B3V9-QR datasheet, BZB84-B3V9-QR pinout, BZB84-B3V9-QR application, or BZB84-B3V9-QR equivalent, this device supports dual-rail protection in compact PCB layouts, requires verification of thermal derating at elevated ambient temperatures, and demands attention to non-repetitive surge current limits during transient suppression design.
Technical Context
This dual-Zener configuration shares a common anode (Pin 3) with independent cathodes (Pins 1 and 2), enabling simultaneous regulation of two separate 3.9 V reference paths or coordinated clamping of complementary signals. Its differential resistance is ≤90 Ω at IZ = 5 mA, ensuring stable regulation under load variation.
The device operates across −55 °C to +150 °C ambient range, with junction-to-ambient thermal resistance of 417 K/W on FR4 PCB, and exhibits a temperature coefficient of −3.5 to 0.0 mV/K - critical for maintaining accuracy in under-hood automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 3.9 V ±2 % - tight tolerance enables accurate reference generation without external trimming in safety-critical circuits. |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C - defines maximum continuous DC power handling on standard FR4 PCB. |
| Non-repetitive Peak Reverse Power | 40 W for tp = 100 µs - supports transient surge suppression per ISO 7637-2 Pulse 1/2a without failure. |
| Forward Voltage | ≤0.9 V at IF = 10 mA - ensures low conduction loss when used in forward-biased protection or biasing paths. |
| Reverse Current | ≤3 µA at VR = 1 V - guarantees minimal leakage in high-impedance sensing nodes. |
| Junction Temperature Limit | 150 °C - sets upper boundary for thermal design margin in engine compartment applications. |
Pinout & Package
SOT23 plastic surface-mount package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm lead pitch, qualified for reflow and wave soldering per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | K1 (Cathode 1) | Connects to first regulated node; reverse-biased for Zener operation at 3.9 V. |
| 2 | K2 (Cathode 2) | Connects to second regulated node; electrically isolated from K1 but shares anode. |
| 3 | CA (Common Anode) | Reference return path for both diodes; must be tied to system ground or bias rail. |
Key Features
| Feature | Design Value |
|---|---|
| Dual common-anode topology | Enables space-efficient dual-rail regulation or bidirectional clamping without discrete anode routing. |
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, humidity testing, and mechanical shock per stress test requirements. |
| ±2 % Zener voltage tolerance (B-series) | Reduces need for post-assembly calibration in precision voltage monitoring circuits like battery management inputs. |
| Low differential resistance (≤90 Ω) | Maintains regulation stability under dynamic load changes typical in microcontroller reset supervision. |
| 150 °C max junction temperature | Supports placement near heat sources in powertrain ECUs without thermal shutdown risk. |
Applications
| Engine Control Unit (ECU) Power Monitoring | Infotainment System Voltage Reference |
|---|---|
|
Use Scenario: Monitoring 5 V supply rail integrity in gasoline direct injection ECU to trigger fail-safe mode upon undervoltage. IC Role / Device Role / Timing Role: Dual Zener provides redundant 3.9 V reference for comparator-based threshold detection on primary and backup power paths. Use Value: Common-anode layout minimizes PCB area while maintaining functional safety ASIL-B compliance via hardware redundancy. |
Use Scenario: Generating stable reference for ADC input scaling in head unit audio codec power domain. IC Role / Device Role / Timing Role: One diode regulates 3.9 V reference; second serves as overvoltage clamp on analog input line. Use Value: Single-component dual function reduces bill-of-materials count and improves long-term drift stability vs. resistor-divider references. |
| Body Control Module (BCM) CAN Transceiver Bias | ADAS Camera Module ESD Protection |
|
Use Scenario: Providing bias voltage and transient protection for isolated CAN FD transceiver VIO pin in door module. IC Role / Device Role / Timing Role: Zener diode regulates 3.9 V logic interface level; same device clamps ESD events on adjacent signal lines. Use Value: Eliminates need for separate TVS and reference diode, reducing component count and improving layout symmetry for EMC performance. |
Use Scenario: Protecting 3.3 V image sensor interface against ISO 10605 ESD pulses in rear-view camera PCB. IC Role / Device Role / Timing Role: Cathodes connected to data lines; common anode grounded - forms low-capacitance bidirectional clamp. Use Value: Diode capacitance ≤450 pF at 0 V ensures <1 ns response time without degrading 100 Mbps LVDS video signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5227BS | Single Zener (3.9 V), SOT363 package, ±5 % tolerance, 200 mW Ptot | Lacks dual-diode functionality; requires two devices for equivalent circuit | Select only if board space allows duplication and cost sensitivity outweighs integration benefit. |
| Vishay SMBZ5227B | Single Zener (3.9 V), SOD-123FL package, ±5 % tolerance, 500 mW Ptot | Higher power rating but no dual configuration; larger footprint than SOT23 | Preferable only for high-surge industrial applications where dual-channel operation is unnecessary. |
Compared with MMBZ5227BS and SMBZ5227B, BZB84-B3V9-QR delivers integrated dual-channel regulation in minimal area with tighter tolerance and automotive qualification - making it optimal for space-constrained, safety-aware automotive modules requiring functional redundancy.
Availability
BZB84-B3V9-QR is available at Aetrix Electronics and suitable for automotive engine control, infotainment power management, and ADAS camera protection requiring stable component supply with full traceability and AEC-Q101 compliance.
Supply support for BZB84-B3V9-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 technologies, delivering high-performance, reliable discrete, logic, and MOSFET solutions for automotive, industrial, and consumer markets.
BZB84-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for dual-rail voltage regulation and transient suppression in harsh-environment automotive electronics.
FAQ
What is the maximum continuous reverse current for BZB84-B3V9-QR at 3.9 V?
The device is rated for continuous Zener current up to 60 mA at 3.9 V, derived from its 300 mW total power dissipation limit and nominal voltage. This assumes ambient temperature ≤25 °C and proper PCB thermal relief; derating is required above 25 °C per the 417 K/W junction-to-ambient thermal resistance.
Can BZB84-B3V9-QR be used in parallel configurations for higher power handling?
No - parallel connection of Zener diodes is not recommended due to mismatch in Zener voltage and dynamic resistance, leading to uneven current sharing and potential thermal runaway. For higher power, use a single higher-rated device or active regulation instead.
How does the common-anode configuration affect PCB layout for dual-rail applications?
The shared anode (Pin 3) must be routed to a low-impedance ground or bias node, while cathodes (Pins 1 and 2) connect independently to their respective regulated rails. This eliminates need for separate anode traces, reducing loop area and improving EMI performance in dense automotive PCBs.
Is the marking code 'VE%' on the device body sufficient for full traceability to BZB84-B3V9-QR?
Yes - per Nexperia's marking table, 'VE%' uniquely identifies BZB84-B3V9-QR within the BZB84-Q series. This code is laser-marked on the SOT23 package and corresponds directly to the 3.9 V ±2 % variant, enabling unambiguous identification during incoming inspection and field returns.
BZB84-B3V9-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):
- 3.9 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 1 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-B3V9-QR FAQ
1.How can I place an order for BZB84-B3V9-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for BZB84-B3V9-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-B3V9-QR reliable?
The price and inventory of BZB84-B3V9-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-B3V9-QR is usually 5 days.
3.What payment methods are accepted for BZB84-B3V9-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZB84-B3V9-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZB84-B3V9-QR?
BZB84-B3V9-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZB84-B3V9-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-B3V9-QR?
For technical support, including BZB84-B3V9-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZB84-B3V9-QR requirements.
6.How does Aetrix verify that BZB84-B3V9-QR is sourced from the original manufacturer or authorized distributors?
All BZB84-B3V9-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-B3V9-QR meets industry standards.
7.What is the process for return or replacement of BZB84-B3V9-QR?
All BZB84-B3V9-QR units undergo pre-shipment inspection (PSI). If there is an issue with BZB84-B3V9-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-B3V9-QR part is unused and in its original packaging.
Return procedure for BZB84-B3V9-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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