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Nexperia USA Inc. BZT52H-A51-QX
- Part No.:
- BZT52H-A51-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52H-A51-QX.pdf
- Description:
- DIODE ZENER 51V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:2,653
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Product details
Overview
BZT52H-A51-QX from Nexperia is a ±1 % tolerance Zener diode in SOD123F package, rated for 51 V nominal breakdown voltage at IZ = 2 mA, with 830 mW total power dissipation and AEC-Q101 qualification for automotive voltage regulation.
For engineers reviewing the BZT52H-A51-QX datasheet, BZT52H-A51-QX pinout, BZT52H-A51-QX application, or BZT52H-A51-QX equivalent, this page delivers verified Zener parameters, thermal resistance (Rth(j-a) = 330 K/W), differential resistance (350 Ω max), reverse current (100 μA max at VR = 48 V), and temperature coefficient (±0.05 mV/K) - all critical for precision biasing and overvoltage clamping in harsh environments.
Technical Context
This Zener operates in reverse-biased breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its ±1 % tolerance and low temperature coefficient (±0.05 mV/K) enable high-accuracy voltage regulation without external trimming.
Designed for surface-mount use on FR4 PCBs with single-sided copper, it leverages the SOD123F package's thermal performance: Rth(j-sp) = 150 K/W to cathode solder point and Rth(j-a) = 330 K/W in free air - supporting reliable operation up to Tj = 150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage VZ | 50.49 V to 51.51 V at IZ = 2 mA - ensures tight 51 V reference for feedback loops and sensing circuits |
| Tolerance | ±1 % - enables direct replacement in high-precision analog references without calibration |
| Differential Resistance rdif | ≤ 350 Ω at IZ = 2 mA - minimizes output voltage variation under dynamic load changes |
| Reverse Current IR | ≤ 100 μA at VR = 48 V - guarantees low leakage in standby and low-power modes |
| Total Power Dissipation Ptot | 830 mW at Tamb ≤ 25 °C on FR4 PCB with 1 cm² cathode pad - defines maximum continuous DC or pulsed power handling |
| Junction Temperature Tj | −65 °C to +150 °C - supports operation in extended automotive under-hood environments |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including HTOL, TC, HAST, and ESD testing |
Pinout & Package
SOD123F plastic surface-mount package: 2.5–2.7 mm length × 1.0–1.2 mm width × 0.7–0.8 mm height; cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal for correct PCB orientation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-biased configuration establishes Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q101 compliant - qualified for engine control units, body electronics, and ADAS power rails |
| Thermal performance | Rth(j-sp) = 150 K/W - enables efficient heat transfer to PCB copper, reducing thermal derating needs |
| Voltage stability | Temperature coefficient ±0.05 mV/K - maintains <±0.5 % drift across −40 °C to +125 °C ambient |
| Low-leakage design | IR ≤ 100 μA at 94 % of VZ - preserves battery life in always-on vehicle modules |
| Robust surge handling | IZSM = 0.4 A (100 μs pulse) - withstands load-dump transients common in 12 V automotive systems |
Applications
| Engine Control Unit (ECU) Reference | Infotainment System Power Monitor |
|---|---|
Use Scenario: Providing stable 51 V reference for ADC input scaling in fuel injection timing circuitry. IC Role / Device Role / Timing Role: Zener voltage reference for analog front-end signal conditioning. Use Value: ±1 % tolerance and ±0.05 mV/K TC ensure <±0.8 % total error over full automotive temperature range, eliminating need for digital calibration. |
Use Scenario: Monitoring 48 V auxiliary supply rail in head unit power management subsystem. IC Role / Device Role / Timing Role: Overvoltage clamp protecting downstream LDOs and microcontrollers. Use Value: 830 mW Ptot and 0.4 A IZSM sustain transient surges without degradation, meeting ISO 7637-2 Pulse 5a requirements. |
| ADAS Camera Module Bias | Electric Power Steering (EPS) Sensor Interface |
Use Scenario: Generating precise bias voltage for CMOS image sensor analog supply in surround-view cameras. IC Role / Device Role / Timing Role: Low-noise voltage reference for analog pixel readout chain. Use Value: 350 Ω rdif limits ripple-induced noise to <1.8 mV at 5 mA load, preserving SNR in 12-bit imaging paths. |
Use Scenario: Regulating excitation voltage for torque sensor Wheatstone bridge in EPS motor control board. IC Role / Device Role / Timing Role: Precision voltage regulator for bridge excitation source. Use Value: 100 μA IR at 48 V ensures <0.02 % bridge imbalance error, directly improving torque measurement resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT52H-B51-Q | ±2 % tolerance; identical VZ range and package | Acceptable where system-level calibration compensates for initial tolerance | Select when cost sensitivity outweighs need for factory-trimmed accuracy |
| BZX84-C51-Q | SOT23 package; ±5 % tolerance; 300 mW Ptot; higher rdif (600 Ω) | Limited to low-power, non-automotive applications due to lower power rating and no AEC-Q101 | Use only in consumer-grade PCBs where space constraints prohibit SOD123F footprint |
Compared with BZT52H-A51-QX, the BZT52H-B51-Q trades 1 % accuracy for lower unit cost while retaining AEC-Q101 compliance and thermal capability, whereas BZX84-C51-Q sacrifices automotive qualification, power handling, and precision to fit smaller boards - making the A51-QX optimal for safety-critical 51 V reference designs.
Availability
BZT52H-A51-QX is available at Aetrix Electronics and suitable for automotive engine control, ADAS camera biasing, infotainment power monitoring, and electric power steering sensor interfaces requiring stable component supply across long production lifecycles.
Supply support for BZT52H-A51-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.
The BZT52H-Q series targets automotive voltage regulation needs - delivering AEC-Q101 Zeners with tight tolerances, robust surge ratings, and optimized thermal footprints for under-hood and chassis-mounted ECUs.
FAQ
What is the maximum reverse current at 48 V for BZT52H-A51-QX?
The maximum reverse current IR is 100 μA at VR = 48 V (94 % of nominal VZ), measured at Tj = 25 °C per Table 9. This value remains stable across −40 °C to +125 °C ambient due to the diode's low temperature coefficient of ±0.05 mV/K.
Can BZT52H-A51-QX replace BZT52C51 in an existing design?
No - BZT52C51 has ±5 % tolerance and is not AEC-Q101 qualified, while BZT52H-A51-QX offers ±1 % tolerance and full automotive qualification. Substitution requires validation of system-level accuracy, thermal margin, and reliability requirements, especially for safety-critical applications.
What is the thermal resistance from junction to solder point?
Rth(j-sp) is 150 K/W when mounted on an FR4 PCB with single-sided copper and a 1 cm² cathode pad, per Table 6. This value assumes soldering at the cathode terminal and defines the dominant thermal path for steady-state power dissipation.
Does BZT52H-A51-QX support reflow soldering only?
Yes - the datasheet explicitly states "Reflow soldering is the only recommended soldering method" for the SOD123F package. Wave or hand soldering risks thermal damage due to the device's 150 °C maximum junction temperature and small thermal mass.
BZT52H-A51-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):
- 51 V
- Tolerance:
- ±1%
- Power - Max:
- 375 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 35.7 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-A51-QX FAQ
1.How can I place an order for BZT52H-A51-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52H-A51-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-A51-QX reliable?
The price and inventory of BZT52H-A51-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-A51-QX is usually 5 days.
3.What payment methods are accepted for BZT52H-A51-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52H-A51-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52H-A51-QX?
BZT52H-A51-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52H-A51-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-A51-QX?
For technical support, including BZT52H-A51-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52H-A51-QX requirements.
6.How does Aetrix verify that BZT52H-A51-QX is sourced from the original manufacturer or authorized distributors?
All BZT52H-A51-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-A51-QX meets industry standards.
7.What is the process for return or replacement of BZT52H-A51-QX?
All BZT52H-A51-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZT52H-A51-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-A51-QX part is unused and in its original packaging.
Return procedure for BZT52H-A51-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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