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Nexperia USA Inc. BZT52H-A43-QX
- Part No.:
- BZT52H-A43-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52H-A43-QX.pdf
- Description:
- DIODE ZENER 43V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:2,439
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Product details
Overview
BZT52H-A43-QX from Nexperia is a precision Zener voltage regulator diode in SOD123F package, rated for 43 V nominal breakdown voltage at 2 mA test current, ±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-A43-QX datasheet, BZT52H-A43-QX pinout, BZT52H-A43-QX application, or BZT52H-A43-QX equivalent, this device serves as a stable shunt reference in power supply feedback loops, ESD-clamped I/O protection networks, and battery monitoring thresholds where tight voltage accuracy and automotive-grade reliability are required.
Technical Context
This Zener diode operates in reverse-biased breakdown mode with a specified VZ = 42.57 V to 43.43 V at IZ = 2 mA, differential resistance rdif ≤ 325 Ω, and temperature coefficient SZ = +0.05 mV/K - indicating near-zero thermal drift across its operating range. It maintains regulation under transient surges up to 40 W (100 μs pulse) and supports continuous operation up to Tj = 150 °C.
The device uses planar epitaxial construction for stable parametric performance, features a cathode-marked SOD123F surface-mount package optimized for reflow soldering, and meets AEC-Q101 stress qualification for high-reliability automotive subsystems including body control modules and sensor interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 42.57 V to 43.43 V at IZ = 2 mA - defines precise regulation point for feedback or clamping |
| Tolerance | ±1 % - enables accurate voltage setting without post-production trimming |
| Power Dissipation (Ptot) | 830 mW at Tamb ≤ 25 °C - supports robust steady-state operation on standard FR4 PCB |
| Differential Resistance (rdif) | ≤ 325 Ω - ensures minimal output voltage shift under load current variation |
| Reverse Current (IR) | ≤ 80 μA at VR = 34.4 V - guarantees low leakage in standby or high-impedance bias networks |
| Thermal Resistance (Rth(j-a)) | 330 K/W - determines junction-to-ambient temperature rise under given power load |
| Non-repetitive Peak Current (IZSM) | 0.6 A at tp = 100 μs - provides surge immunity against ESD or load-dump transients |
Pinout & Package
SOD123F surface-mount plastic package: 2-terminal, flat lead, cathode marked by bar; dimensions 3.4–3.6 mm × 2.5–2.7 mm × 1.0–1.2 mm; optimized for automated placement and reflow soldering per IPC-7351B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; polarity marker aligns with PCB silkscreen bar |
| 2 | Anode (A) | Connected to ground or lower-potential rail; forms shunt path during reverse conduction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood and cabin applications including temperature cycling, HTRB, and ESD testing |
| ±1 % Zener voltage tolerance | Reduces need for external calibration and improves system-level voltage accuracy in feedback paths |
| 830 mW power rating | Enables use in higher-current shunt regulators without derating below 85 °C ambient |
| Low 325 Ω dynamic impedance | Maintains regulation stability when driving variable loads or sharing current with parallel devices |
| SOD123F footprint compatibility | Matches industry-standard layout for space-constrained PCBs and supports high-density assembly |
Applications
| Automotive Body Control Module (BCM) | Industrial Power Supply Feedback |
|---|---|
Use Scenario: Voltage reference for microcontroller ADC input scaling in door module voltage monitoring. IC Role / Device Role / Timing Role: Shunt Zener providing stable 43 V reference to condition battery-sensed signals before digitization. Use Value: ±1 % tolerance ensures <10 mV absolute error in 43 V reference, meeting ASIL-B diagnostic accuracy requirements. |
Use Scenario: Output voltage regulation in isolated flyback converter feedback network. IC Role / Device Role / Timing Role: Precision shunt element in optocoupler-coupled feedback loop to maintain ±1.5 % output regulation. Use Value: Low rdif minimizes load-induced drift, enabling tighter closed-loop control without additional compensation. |
| ESD-Protected Sensor Interface | Backup Battery Monitoring Circuit |
Use Scenario: Clamping diode on CAN transceiver I/O line subjected to ISO 10605 ESD pulses. IC Role / Device Role / Timing Role: Fast-acting shunt limiter that clamps transients above 43 V while maintaining low leakage at 24 V nominal. Use Value: 0.6 A non-repetitive surge rating absorbs 15 kV contact discharge energy without degradation. |
Use Scenario: Overvoltage detection in lithium-iron-phosphate (LiFePO4) backup battery management. IC Role / Device Role / Timing Role: Threshold detector triggering shutdown when cell voltage exceeds 43 V (10S stack). Use Value: Near-zero temperature coefficient ensures consistent trip point across –40 °C to +125 °C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT52H-B43-Q | ±2 % tolerance (42.1 V–43.9 V), identical package and power rating | Acceptable where system-level calibration compensates for wider voltage spread | Select for cost-sensitive automotive modules where ±2 % is sufficient for functional safety margin |
| MMBZ5256BS-7-F | 43 V nominal, ±5 % tolerance, SOT-23 package, 350 mW Ptot | Lower power handling and looser tolerance; suitable only for signal-level clamping | Choose only for space-constrained non-automotive designs with <100 mW average dissipation |
Compared with BZT52H-A43-QX, the BZT52H-B43-Q offers reduced cost at the expense of ±1 % → ±2 % voltage accuracy, while MMBZ5256BS-7-F sacrifices both power capability and automotive qualification for smaller footprint - making the A43-QX optimal for AEC-Q101-compliant 43 V reference designs requiring long-term stability.
Availability
BZT52H-A43-QX is available at Aetrix Electronics and suitable for automotive body electronics, industrial power supply feedback loops, and ESD-protected sensor interfaces requiring stable component supply with full traceability and AEC-Q101 compliance documentation.
Supply support for BZT52H-A43-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 AEC-Q101-qualified Zener diode product line, engineered specifically for precision voltage reference and transient suppression in harsh-environment automotive and industrial systems.
FAQ
What is the maximum continuous reverse current this diode can sustain at 43 V?
The BZT52H-A43-QX is not rated for continuous reverse conduction at 43 V - it is a Zener regulator designed for controlled breakdown. At VR = 43 V, reverse current depends on circuit impedance; sustained operation must remain within Ptot = 830 mW limit, implying IZ ≤ 19.3 mA at 43 V. Exceeding this risks thermal runaway.
Does the SOD123F package support hand soldering?
No - the datasheet explicitly states "reflow soldering is the only recommended soldering method" for SOD123F. Hand soldering risks thermal damage due to localized overheating and insufficient heat transfer to the cathode pad; hot-air rework with preheating to 100 °C and controlled ramp rates is required if manual repair is unavoidable.
How does the ±1 % tolerance affect temperature coefficient behavior?
The ±1 % tolerance (A-grade) correlates with tighter process control that also yields improved thermal stability: SZ = +0.05 mV/K is specified across the full VZ range for A-grade parts, whereas B- and C-grade variants show identical SZ but wider VZ spread - confirming that tolerance grade directly reflects manufacturing consistency affecting both initial accuracy and drift.
Can this diode replace older BZT52C43 or BZX84-C43 parts?
Yes, with caveats: BZT52H-A43-QX matches the 43 V rating and SOD123F footprint of legacy BZT52C43 but adds AEC-Q101 qualification, ±1 % tolerance, and higher 830 mW rating versus 500 mW for BZT52C43. Pin-compatible substitution is valid, but verify thermal design margins and automotive compliance requirements before drop-in replacement.
BZT52H-A43-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):
- 43 V
- Tolerance:
- ±1%
- Power - Max:
- 375 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 30.1 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-A43-QX FAQ
1.How can I place an order for BZT52H-A43-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52H-A43-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-A43-QX reliable?
The price and inventory of BZT52H-A43-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-A43-QX is usually 5 days.
3.What payment methods are accepted for BZT52H-A43-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52H-A43-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52H-A43-QX?
BZT52H-A43-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52H-A43-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-A43-QX?
For technical support, including BZT52H-A43-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52H-A43-QX requirements.
6.How does Aetrix verify that BZT52H-A43-QX is sourced from the original manufacturer or authorized distributors?
All BZT52H-A43-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-A43-QX meets industry standards.
7.What is the process for return or replacement of BZT52H-A43-QX?
All BZT52H-A43-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZT52H-A43-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-A43-QX part is unused and in its original packaging.
Return procedure for BZT52H-A43-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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