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Nexperia USA Inc. BZT52H-A4V3-QX
- Part No.:
- BZT52H-A4V3-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52H-A4V3-QX.pdf
- Description:
- DIODE ZENER 4.3V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:4,358
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Product details
Overview
BZT52H-A4V3-QX from Nexperia is a precision Zener voltage regulator diode in SOD123F package, rated for 4.3 V nominal breakdown voltage at 5 mA, ±1 % tolerance, 830 mW total power dissipation, and qualified to AEC-Q101 for automotive voltage reference and overvoltage protection circuits.
For engineers reviewing the BZT52H-A4V3-QX datasheet, BZT52H-A4V3-QX pinout, BZT52H-A4V3-QX application, or BZT52H-A4V3-QX equivalent, this device serves as a stable shunt reference in low-power supply monitoring, ECU sensor biasing, and CAN/LIN bus clamp circuits where tight voltage regulation and automotive-grade reliability are required.
Technical Context
This Zener diode operates in reverse-biased breakdown mode with a typical differential resistance of 95 Ω at IZ = 5 mA and a temperature coefficient of −3.5 to 0.0 mV/K, enabling predictable voltage drift across −65 °C to +150 °C ambient range. Its low 0.9 V forward voltage at 10 mA supports bidirectional clamping configurations.
The device features a maximum non-repetitive peak reverse current of 6.0 A (tp = 100 μs), junction-to-ambient thermal resistance of 330 K/W on FR4 PCB, and cathode-anode polarity clearly marked by a bar on the SOD123F body - confirming its role as a two-terminal passive voltage stabilization element.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.25 V to 4.35 V at IZ = 5 mA - defines precise regulation point for feedback or reference use |
| Tolerance | ±1 % - ensures minimal unit-to-unit variation in critical voltage-sensing applications |
| Power Dissipation (Ptot) | 830 mW at Tamb ≤ 25 °C - supports sustained operation in compact automotive PCB layouts |
| Differential Resistance (rdif) | 95 Ω max at IZ = 5 mA - determines output impedance and load regulation sensitivity |
| Reverse Current (IR) | 3 μA max at VR = 1 V - guarantees low leakage in standby or battery-powered systems |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - enables effective bidirectional transient suppression when used with series resistor |
| Junction Temperature (Tj) | −65 °C to +150 °C - validates suitability for under-hood automotive environments |
Pinout & Package
SOD123F surface-mount plastic package: 2-pin, flat lead, cathode-marked with bar; dimensions 3.5 mm × 1.7 mm × 1.0 mm; optimized for reflow soldering on FR4 PCB with standard footprint per Figure 12.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated voltage node; marking bar identifies this terminal - reverse-bias connection point for Zener operation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes current path during breakdown conduction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics per stress test requirements - eliminates need for additional qualification effort |
| ±1 % voltage tolerance | Enables direct replacement in high-accuracy feedback loops without trimming resistors |
| 830 mW power rating | Supports higher current regulation than standard 500 mW Zeners - reduces thermal derating in dense layouts |
| SOD123F package | 0.95 mm profile and 1.7 mm width allow placement near ICs or connectors without shadowing adjacent components |
| Low 3 μA reverse leakage | Minimizes quiescent current draw in always-on vehicle modules such as door controllers or telematics units |
Applications
| Engine Control Unit (ECU) Sensor Biasing | Automotive LIN Bus Clamping |
|---|---|
Use Scenario: Providing stable 4.3 V reference for analog sensor signal conditioning in engine temperature and pressure sensors. IC Role / Device Role / Timing Role: Shunt voltage reference connected between sensor supply and ground, maintaining fixed bias point despite supply ripple. Use Value: ±1 % VZ tolerance ensures <10 mV error in 4.3 V reference, directly improving ADC measurement accuracy in closed-loop control. |
Use Scenario: Protecting LIN transceiver inputs from load-dump transients and ESD events in body control modules. IC Role / Device Role / Timing Role: Bidirectional clamp placed between LIN line and ground, conducting surge energy during negative excursions and limiting positive spikes via Zener action. Use Value: 6.0 A non-repetitive peak reverse current rating handles ISO 16750-2 pulse 5a surges without degradation. |
| Infotainment System Power Monitor | ADAS Camera Module Reference |
Use Scenario: Detecting undervoltage conditions on 5 V system rails in head unit power management circuits. IC Role / Device Role / Timing Role: Zener-based comparator input reference, triggering reset or warning when supply drops below 4.3 V threshold. Use Value: −3.5 to 0.0 mV/K temperature coefficient ensures stable trip point across −40 °C to +85 °C operating range. |
Use Scenario: Supplying precision bias voltage to CMOS image sensor analog front-end in surround-view cameras. IC Role / Device Role / Timing Role: Low-noise shunt regulator stabilizing AVDD rail for pixel readout circuitry. Use Value: 95 Ω differential resistance minimizes output impedance-induced noise coupling into sensitive analog imaging paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT52C4V3-Q | ±5 % tolerance, 3 μA IR max at VR = 1 V, same SOD123F package | Lower cost for non-critical biasing where ±1 % is not required | Select when tighter regulation is unnecessary and BOM cost reduction is prioritized |
| MMSZ4685T1G | 4.3 V nominal, ±5 %, 500 mW Ptot, SOD-123 package (mechanically identical but not AEC-Q101 qualified) | Industrial-grade alternative lacking automotive qualification documentation | Use only in non-automotive designs where AEC-Q101 compliance is not mandated |
Compared with BZT52H-A4V3-QX, BZT52C4V3-Q trades regulation accuracy for cost, while MMSZ4685T1G sacrifices automotive qualification for broader distributor availability - making the original part uniquely suited for safety-critical automotive voltage references requiring both precision and qualification traceability.
Availability
BZT52H-A4V3-QX is available at Aetrix Electronics and suitable for automotive ECU design, LIN bus protection, and ADAS camera reference circuits requiring stable component supply with full AEC-Q101 documentation and lot-level traceability.
Supply support for BZT52H-A4V3-QX 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 technologies.
The BZT52H-Q series belongs to Nexperia's automotive Zener diode product line, engineered specifically for voltage regulation, clamping, and reference functions in harsh-environment automotive subsystems including powertrain, body electronics, and infotainment.
FAQ
What is the maximum continuous reverse current this Zener can handle at 4.3 V?
The BZT52H-A4V3-QX does not specify a maximum continuous reverse current independent of power dissipation. At 4.3 V, the absolute maximum steady-state current is limited by its 830 mW total power rating - yielding approximately 193 mA (830 mW ÷ 4.3 V) at 25 °C ambient with adequate PCB copper area. Derating applies above 25 °C per the thermal resistance curve.
Can this diode be used in bidirectional TVS configurations?
No - the BZT52H-A4V3-QX is a unidirectional Zener diode optimized for reverse-bias regulation. While its forward voltage is specified (≤0.9 V), it lacks symmetric breakdown characteristics or guaranteed forward surge capability. For bidirectional transient suppression, dedicated TVS diodes like PESD5V0S1BA should be used instead.
Is the SOD123F package compatible with standard reflow profiles?
Yes - Nexperia explicitly recommends reflow soldering only for the SOD123F package, and provides a defined footprint (Figure 12) with 2.9 mm × 1.6 mm solder land dimensions. The device complies with JEDEC J-STD-020 moisture sensitivity level 1, allowing unlimited floor life and standard Pb-free reflow profiles up to 260 °C peak temperature.
How does the ±1 % tolerance affect stability in temperature-varying environments?
The ±1 % tolerance applies at 25 °C; actual voltage drift with temperature is governed by the specified temperature coefficient (−3.5 to 0.0 mV/K). Over −40 °C to +125 °C, the total deviation remains within ±2.5 % of nominal 4.3 V due to the low and bounded TC - making it more stable than wider-tolerance Zeners under thermal cycling.
BZT52H-A4V3-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZT52H-Q
- Package/Case:
- SOD-123F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 4.3 V
- Tolerance:
- ±1.16%
- Power - Max:
- 375 mW
- Impedance (Max) (Zzt):
- 95 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:
- SOD-123F
BZT52H-A4V3-QX FAQ
1.How can I place an order for BZT52H-A4V3-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52H-A4V3-QX 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 BZT52H-A4V3-QX reliable?
The price and inventory of BZT52H-A4V3-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52H-A4V3-QX is usually 5 days.
3.What payment methods are accepted for BZT52H-A4V3-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52H-A4V3-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52H-A4V3-QX?
BZT52H-A4V3-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52H-A4V3-QX 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 BZT52H-A4V3-QX?
For technical support, including BZT52H-A4V3-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52H-A4V3-QX requirements.
6.How does Aetrix verify that BZT52H-A4V3-QX is sourced from the original manufacturer or authorized distributors?
All BZT52H-A4V3-QX 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 BZT52H-A4V3-QX meets industry standards.
7.What is the process for return or replacement of BZT52H-A4V3-QX?
All BZT52H-A4V3-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZT52H-A4V3-QX, 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 BZT52H-A4V3-QX part is unused and in its original packaging.
Return procedure for BZT52H-A4V3-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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