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Nexperia USA Inc. BZB84-B39-QR
- Part No.:
- BZB84-B39-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Zener Diode Arrays
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZB84-B39-QR.pdf
- Description:
- BZB84-B39-Q/SOT23/TO-236AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,493
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Product details
Overview
BZB84-B39-QR from Nexperia is a dual common-anode Zener diode in SOT23 package, rated for 39 V nominal Zener voltage (±2 % tolerance), 300 mW total power dissipation, and qualified to AEC-Q101 for automotive voltage regulation. It provides precision clamping and reference functions in compact space-constrained PCBs.
For engineers reviewing the BZB84-B39-QR datasheet, BZB84-B39-QR pinout, BZB84-B39-QR application, or BZB84-B39-QR equivalent, this page delivers verified electrical parameters, thermal behavior, automotive qualification status, and real-world use context for robust circuit design and sourcing decisions.
Technical Context
This dual-Zener device integrates two independent Zener diodes sharing a common anode (Pin 3), enabling bidirectional voltage clamping or dual-rail reference generation from a single footprint. Its ±2 % VZ tolerance and low differential resistance (≤130 Ω at IZ = 2 mA) support stable regulation under varying load conditions.
Designed for automotive environments, it sustains junction temperatures up to 150 °C and withstands non-repetitive surge currents up to 0.7 A (100 µs square wave). Thermal resistance from junction to solder point is 100 K/W, facilitating reliable heat transfer in high-density layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 39 V nominal, ±2 % tolerance - ensures tight regulation accuracy for reference and protection circuits |
| Total Power Dissipation Ptot | 300 mW at Tamb ≤ 25 °C - defines continuous DC power handling on standard FR4 PCB |
| Differential Resistance rdif | ≤130 Ω at IZ = 2 mA - low dynamic impedance improves regulation stability against current variation |
| Non-repetitive Peak Reverse Current IZSM | 0.7 A (100 µs, Tj = 25 °C) - supports transient overvoltage suppression without damage |
| Forward Voltage VF | ≤0.9 V at IF = 10 mA - enables low-loss forward conduction when used as clamp or level shifter |
| Junction Temperature Range | –55 °C to +150 °C - validated for under-hood automotive operation and industrial temperature extremes |
| AEC-Q101 Qualified | Yes - certified for automotive discrete semiconductor stress testing per AEC standard |
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 and standardized footprint per Fig. 12 (reflow) and Fig. 13 (wave).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K1) | Cathode of Diode 1 | Connects to regulated node or signal line requiring 39 V clamping; reverse-biased during Zener operation |
| 2 (K2) | Cathode of Diode 2 | Independent cathode for second 39 V Zener path - enables dual-rail referencing or redundancy |
| 3 (CA) | Common Anode | Shared anode terminal; ties both diodes to ground or low-impedance return path for bidirectional clamping |
Key Features
| Feature | Design Value |
|---|---|
| Dual common-anode configuration | Enables compact dual-voltage reference or symmetrical clamping without extra components or board area |
| ±2 % Zener voltage tolerance | Reduces need for post-production calibration in precision analog sensing and feedback loops |
| AEC-Q101 qualification | Validates reliability for automotive ECU, ADAS sensor modules, and infotainment power rails |
| Low thermal resistance (Rth(j-sp) = 100 K/W) | Supports sustained operation at elevated ambient temperatures without derating in thermally constrained designs |
| Non-repetitive peak power rating (40 W) | Provides robustness against ESD and load-dump transients in 12 V/24 V vehicle systems |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Voltage clamping on LIN bus transceiver supply rail subject to load dump and battery reversal transients. IC Role / Device Role / Timing Role: Dual-Zener acts as bidirectional overvoltage protector, limiting rail excursions to ±39 V relative to common anode ground. Use Value: Prevents damage to LIN PHY ICs while maintaining signal integrity via fast response (<100 ns) and low leakage (<0.05 µA at 30 V). |
Use Scenario: Precision reference for 4–20 mA loop transmitter using op-amp-based current source. IC Role / Device Role / Timing Role: Provides stable 39 V reference for DAC output scaling and current mirror biasing. Use Value: ±2 % tolerance and <130 Ω dynamic impedance ensure <0.5 % full-scale error across temperature and supply variations. |
| Automotive Infotainment Power Sequencing | Medical Instrumentation Voltage Monitoring |
Use Scenario: Supervisory circuit monitoring 3.3 V and 5 V rails in head unit MCU subsystems. IC Role / Device Role / Timing Role: Dual cathodes independently monitor each rail; common anode tied to system ground for fault detection logic. Use Value: Enables single-component dual-rail monitoring with guaranteed 39 V breakdown margin above worst-case rail overshoot. |
Use Scenario: Overvoltage lockout in portable ECG front-end amplifier power stage. IC Role / Device Role / Timing Role: Clamps amplifier supply to safe 39 V during defibrillation pulse coupling events. Use Value: AEC-Q101 qualification and 0.7 A surge rating ensure fail-safe operation in life-critical medical equipment. |
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-C39-Q | ±5 % Zener tolerance vs. ±2 %; otherwise identical package, pinout, and surge ratings | Acceptable where cost sensitivity outweighs precision requirement; higher IR (≤0.05 µA vs. ≤0.05 µA) and slightly higher rdif (≤150 Ω) | Select for non-critical biasing or general-purpose clamping where tighter tolerance is unnecessary |
| MMBZ5240BS-7-F | Single Zener (39 V, ±5 %), SOT-363 package, lower Ptot (200 mW), no AEC-Q101 qualification | Lacks dual-cathode functionality and automotive qualification; unsuitable for safety-critical or dual-rail use | Only consider for cost-driven consumer electronics with no automotive or dual-path requirements |
Compared with BZB84-C39-Q, the BZB84-B39-QR offers tighter voltage control essential for precision references; versus MMBZ5240BS-7-F, it delivers dual-channel capability and AEC-Q101 assurance required for automotive deployment.
Availability
BZB84-B39-QR is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor transmitters, infotainment power supervisors, and medical instrumentation requiring stable component supply with traceable automotive-grade sourcing.
Supply support for BZB84-B39-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 energy-efficient solutions.
The BZB84-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for robust voltage regulation and transient protection in automotive power domains and industrial control systems.
FAQ
What is the maximum continuous reverse current for BZB84-B39-QR at 39 V?
The device is not rated for continuous reverse conduction at VZ; its specified Zener test current is 2 mA. At 39 V, reverse leakage is ≤0.05 µA (per Table 9), and sustained operation above 2 mA requires thermal derating per the 300 mW Ptot limit and Rth(j-a) = 417 K/W.
Can BZB84-B39-QR be used for bidirectional ESD protection?
No - it is a Zener diode, not an ESD suppressor. While it clamps above 39 V in reverse bias and conducts forward below 0.9 V, its 40 W non-repetitive surge rating applies only to short pulses (100 µs), not standardized ESD waveforms (e.g., IEC 61000-4-2). Dedicated TVS diodes are recommended for ESD compliance.
Is the common anode (Pin 3) internally fused or isolated between diodes?
Pin 3 is a monolithic common anode connection - both diode junctions share the same silicon anode region. There is no internal fuse or isolation; failure of one diode may affect the other due to shared thermal and electrical paths.
How does temperature affect the 39 V Zener voltage in automotive operating range?
At IZ = 2 mA, the temperature coefficient is +12.6 mV/K (Table 9), meaning VZ increases by ~1.26 V over a 100 K rise (–40 °C to +60 °C ambient). This positive drift is typical for Zeners >5 V and must be accounted for in high-accuracy reference designs.
BZB84-B39-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):
- 39 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 130 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 27.3 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-B39-QR FAQ
1.How can I place an order for BZB84-B39-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for BZB84-B39-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-B39-QR reliable?
The price and inventory of BZB84-B39-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-B39-QR is usually 5 days.
3.What payment methods are accepted for BZB84-B39-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZB84-B39-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZB84-B39-QR?
BZB84-B39-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZB84-B39-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-B39-QR?
For technical support, including BZB84-B39-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZB84-B39-QR requirements.
6.How does Aetrix verify that BZB84-B39-QR is sourced from the original manufacturer or authorized distributors?
All BZB84-B39-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-B39-QR meets industry standards.
7.What is the process for return or replacement of BZB84-B39-QR?
All BZB84-B39-QR units undergo pre-shipment inspection (PSI). If there is an issue with BZB84-B39-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-B39-QR part is unused and in its original packaging.
Return procedure for BZB84-B39-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZB84-B39-QR Tags
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