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Nexperia USA Inc. BZB84-B4V3-QR
- Part No.:
- BZB84-B4V3-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Zener Diode Arrays
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZB84-B4V3-QR.pdf
- Description:
- BZB84-B4V3-Q/SOT23/TO-236AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,396
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Product details
Overview
BZB84-B4V3-QR from Nexperia is a dual Zener diode in SOT23 package with nominal 4.3 V regulation voltage (±2 % tolerance), common-anode configuration, 300 mW total power dissipation, and AEC-Q101 qualification for automotive voltage reference and overvoltage protection circuits.
For engineers reviewing the BZB84-B4V3-QR datasheet, BZB84-B4V3-QR pinout, BZB84-B4V3-QR application, or BZB84-B4V3-QR equivalent, this device serves as a space-efficient dual-voltage clamp in power rail monitoring, ECU input conditioning, and dual-rail regulator feedback networks where precision, thermal stability, and automotive-grade reliability are required.
Technical Context
This dual common-anode Zener diode integrates two independently rated 4.3 V Zener junctions sharing a single anode terminal, enabling bidirectional clamping or dual-rail referencing from one footprint. Its ±2 % voltage tolerance and low 90 Ω typical differential resistance at IZ = 5 mA ensure stable regulation under varying load conditions.
The device operates across –55 °C to +150 °C ambient, with junction-to-ambient thermal resistance of 417 K/W on FR4 PCB, and supports non-repetitive surge currents up to 6.0 A (100 µs square wave) without degradation-critical for transient suppression in automotive 12 V systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 4.3 V ±2 % - Tight tolerance enables accurate voltage reference without external trimming in safety-critical sensor interfaces. |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C - Supports continuous operation in compact automotive control modules with minimal heatsinking. |
| Differential Resistance | 90 Ω max at IZ = 5 mA - Low dynamic impedance maintains regulation accuracy during fast load transients in power management IC feedback paths. |
| Non-repetitive Peak Reverse Current | 6.0 A (100 µs, Tj = 25 °C) - Withstands ISO 7637-2 pulse 1/2a surges without failure in vehicle battery line protection. |
| Reverse Current @ VR = 1 V | ≤ 3 µA - Ensures negligible leakage in always-on microcontroller reset circuits and low-power wake-up detection nodes. |
| Temperature Coefficient | –3.5 to 0.0 mV/K - Near-zero drift region allows stable reference performance across engine bay temperature ranges (–40 °C to +125 °C). |
| Junction Temperature Limit | 150 °C - Matches under-hood thermal requirements for transmission control units and body electronics. |
Pinout & Package
SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm, 1.9 mm pitch); thermally optimized for reflow soldering on FR4 PCB with tin-plated copper layers.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K1) | Cathode of Diode 1 | Connects to regulated node requiring 4.3 V clamping; reverse-biased during normal operation to maintain reference potential. |
| 2 (K2) | Cathode of Diode 2 | Independent cathode for second 4.3 V regulation path-enables dual-rail supervision (e.g., MCU core & I/O supply) from one device. |
| 3 (CA) | Common Anode | Shared anode tied to system ground or lower-potential rail; defines common return for both Zener junctions in clamping topology. |
Key Features
| Feature | Design Value |
|---|---|
| Dual common-anode Zener topology | Reduces PCB area by 50 % vs. two discrete SOT23 Zeners while maintaining independent cathode routing for dual-supply monitoring. |
| AEC-Q101 qualification | Validated for automotive applications including engine control, ADAS sensors, and infotainment power domains per stress test standard. |
| ±2 % Zener voltage tolerance (B-series) | Eliminates need for post-solder calibration in high-accuracy analog front-ends such as battery cell voltage monitors. |
| 40 W non-repetitive peak reverse power | Handles 12 V system load-dump transients (ISO 16750-2) without derating or external TVS supplementation. |
| Low 0.9 V forward voltage at 10 mA | Enables use as bidirectional level shifter or logic-level clamp in CAN/LIN bus interface protection circuits. |
Applications
| Engine Control Unit (ECU) Input Protection | Automotive Sensor Signal Conditioning |
|---|---|
Use Scenario: Protecting analog inputs of 32-bit microcontrollers against battery voltage spikes and reverse polarity events in gasoline/diesel ECUs. IC Role / Device Role / Timing Role: Dual Zener clamps both signal and reference lines to 4.3 V, preventing ADC saturation and latch-up during ISO 7637-2 pulse 5a surges. Use Value: Enables direct connection of potentiometer-based throttle position sensors to MCU without external op-amp buffering or discrete clamp diodes. |
Use Scenario: Stabilizing excitation voltage for piezoresistive pressure sensors in brake master cylinder assemblies. IC Role / Device Role / Timing Role: Provides matched 4.3 V reference to Wheatstone bridge excitation and ADC reference input using shared anode architecture. Use Value: Reduces offset drift to <±0.5 % over –40 °C to +125 °C, meeting ASIL-B functional safety requirements for hydraulic brake monitoring. |
| Body Control Module (BCM) Power Sequencing | Infotainment System Reset Circuit |
Use Scenario: Enforcing strict power-up sequence between 5 V microcontroller core and 3.3 V peripheral rails in door module controllers. IC Role / Device Role / Timing Role: Dual cathodes regulate separate rails; common anode tied to ground establishes deterministic turn-on timing via controlled Zener conduction. Use Value: Guarantees >100 ms delay between VCORE and VIO stabilization, eliminating boot failures caused by asynchronous power ramp rates. |
Use Scenario: Generating clean, glitch-free reset pulses for ARM Cortex-A53 processors during cold cranking (5.5–14.5 V battery range). IC Role / Device Role / Timing Role: One Zener leg holds reset line low until 4.3 V rail stabilizes; second leg monitors backup RTC supply for brown-out detection. Use Value: Achieves <1 µs reset assertion jitter and eliminates false resets during alternator ripple (100 Hz, ±1.5 V pk-pk) in head unit designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5229BS | Single Zener (4.3 V, ±5 %), SOT23, no dual configuration | Requires two devices for dual-rail use; lacks common-anode integration | Select when only single-rail clamping is needed and board space permits discrete placement. |
| Vishay SMBZ5229-E3/52 | Single Zener (4.3 V, ±5 %), SOD-123, 500 mW Ptot | Higher power rating but larger footprint; no dual functionality | Choose for higher continuous power handling in non-automotive industrial regulators where AEC-Q101 is not required. |
Compared with MMBZ5229BS and SMBZ5229-E3/52, BZB84-B4V3-QR uniquely delivers dual 4.3 V references in one AEC-Q101-qualified SOT23 package-reducing component count, improving thermal coupling between regulation paths, and enabling tighter layout-controlled timing in automotive power sequencing.
Availability
BZB84-B4V3-QR is available at Aetrix Electronics and suitable for automotive ECU design, sensor interface development, and body electronics production requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZB84-B4V3-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 specializing in high-performance, reliable discrete and logic devices, with leadership in automotive-qualified components and energy-efficient solutions.
BZB84-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for robust voltage regulation and transient protection in harsh automotive environments-including powertrain, chassis, and ADAS subsystems.
FAQ
What is the maximum continuous reverse current this device can sustain at 25 °C ambient?
The BZB84-B4V3-QR supports a maximum continuous reverse current of 200 mA per diode, as specified in the Absolute Maximum Ratings table. This corresponds to ~860 mW dissipation per junction at 4.3 V, but total device power must remain within the 300 mW limit-so sustained operation above ~70 mA per diode requires thermal derating based on PCB copper area and airflow.
Can this dual Zener be used for bidirectional ESD protection on a USB data line?
No-BZB84-B4V3-QR is not designed for ESD protection. Its 4.3 V Zener voltage is too high for USB 2.0 signal integrity (requires clamping below 1.2 V), and its 6.0 A surge rating applies only to 100 µs pulses, not the 150 ps HBM waveform. Use dedicated ESD arrays like Nexperia PESD5V0S1BA instead.
How does the common-anode configuration affect thermal performance compared to dual-cathode alternatives?
The common-anode layout concentrates heat generation at pin 3 (CA), resulting in lower effective thermal resistance from both junctions to the PCB pad beneath pin 3. Measured Rth(j-sp) is 100 K/W to solder point-20 % better than discrete dual-SOT23 layouts-making it preferable for high-duty-cycle regulation in confined spaces.
Is the 4.3 V Zener voltage specified at IZ = 5 mA or IZ = 1 mA?
The 4.3 V nominal voltage is specified at IZ = 5 mA, as confirmed in Table 8 of the datasheet. At IZ = 1 mA, the measured voltage drops to approximately 4.15 V due to the Zener's knee characteristic-designers must bias at 5 mA for guaranteed ±2 % tolerance compliance.
BZB84-B4V3-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):
- 4.3 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-B4V3-QR FAQ
1.How can I place an order for BZB84-B4V3-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for BZB84-B4V3-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-B4V3-QR reliable?
The price and inventory of BZB84-B4V3-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-B4V3-QR is usually 5 days.
3.What payment methods are accepted for BZB84-B4V3-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZB84-B4V3-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZB84-B4V3-QR?
BZB84-B4V3-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZB84-B4V3-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-B4V3-QR?
For technical support, including BZB84-B4V3-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZB84-B4V3-QR requirements.
6.How does Aetrix verify that BZB84-B4V3-QR is sourced from the original manufacturer or authorized distributors?
All BZB84-B4V3-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-B4V3-QR meets industry standards.
7.What is the process for return or replacement of BZB84-B4V3-QR?
All BZB84-B4V3-QR units undergo pre-shipment inspection (PSI). If there is an issue with BZB84-B4V3-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-B4V3-QR part is unused and in its original packaging.
Return procedure for BZB84-B4V3-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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