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Nexperia USA Inc. BZT52H-B51-QX
- Part No.:
- BZT52H-B51-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52H-B51-QX.pdf
- Description:
- DIODE ZENER 51V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:2,865
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Product details
Overview
BZT52H-B51-QX from Nexperia is a ±2 % tolerance Zener diode in SOD123F package, rated for 51 V nominal breakdown voltage at IZ = 2 mA, 830 mW total power dissipation, and qualified to AEC-Q101 for automotive voltage regulation. It provides stable reference voltage in power supply feedback loops, overvoltage clamping circuits, and ECU bias networks.
For engineers reviewing the BZT52H-B51-QX datasheet, BZT52H-B51-QX pinout, BZT52H-B51-QX application, or BZT52H-B51-QX equivalent, key selection criteria include Zener voltage tolerance (±2 %), thermal resistance (150 K/W junction-to-solder-point), differential resistance (≤350 Ω at IZ = 2 mA), reverse current (≤100 μA at VR = 39 V), and automotive qualification status.
Technical Context
This Zener diode operates in reverse-bias breakdown mode with a temperature coefficient of +0.05 mV/K at IZ = 2 mA, enabling predictable voltage drift across automotive ambient ranges (−65 °C to +150 °C). Its low 350 Ω typical differential resistance ensures minimal output impedance under dynamic load conditions.
The device uses silicon planar technology with metallized cathode termination, packaged in a flat-lead SOD123F outline optimized for reflow soldering on FR4 PCBs. Junction-to-solder-point thermal resistance is 150 K/W, supporting reliable operation at up to 150 °C junction temperature when mounted per specified pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 50.0 V to 52.0 V at IZ = 2 mA - defines precise regulation point for feedback or clamp circuits |
| Tolerance | ±2 % - enables tighter system-level voltage margin control vs. ±5 % variants |
| Differential Resistance (rdif) | ≤350 Ω at IZ = 2 mA - limits output voltage variation under changing load current |
| Reverse Current (IR) | ≤100 μA at VR = 39 V - ensures low leakage in standby or high-impedance sensing nodes |
| Total Power Dissipation (Ptot) | 830 mW at Tamb ≤ 25 °C - supports continuous regulation in compact automotive PCB layouts |
| Junction Temperature (Tj) | −65 °C to +150 °C - validated for under-hood and transmission-control module environments |
| AEC-Q101 Qualified | Yes - certified for automotive discrete semiconductor stress testing including HTGB, HTRB, and temperature cycling |
Pinout & Package
The BZT52H-B51-QX is housed in a surface-mount SOD123F plastic package (3.6 mm × 2.7 mm × 1.2 mm) with flat leads and cathode marking bar. Mounting requires reflow only, using the recommended footprint with 1.1 mm × 1.2 mm solder lands and 2.9 mm center-to-center pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal; carries reverse current during Zener conduction |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes bias path for reverse-biased operation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use per stress test requirements including HTGB, HTRB, and temperature cycling |
| ±2 % Zener voltage tolerance | Enables tighter closed-loop regulation in 12 V/24 V vehicle power systems without post-calibration |
| 830 mW power rating | Supports sustained 51 V clamping at ~16 mA average current in transient suppression applications |
| SOD123F package | 0.55 mm lead pitch and 1.2 mm height enable high-density placement on engine control unit PCBs |
| Low thermal resistance (150 K/W j-sp) | Permits direct thermal coupling to copper pour for improved reliability in thermally constrained modules |
Applications
| Engine Control Unit (ECU) Reference | Infotainment Power Sequencing |
|---|---|
Use Scenario: Provides stable 51 V reference for analog-to-digital converter input scaling in diesel common-rail pressure sensor interfaces. IC Role / Device Role / Timing Role: Zener voltage reference diode establishing precision bias point for signal conditioning amplifier. Use Value: ±2 % tolerance maintains <1.5 LSB error across ADC full scale at 12-bit resolution under −40 °C to +125 °C ambient. |
Use Scenario: Clamps 51 V rail during hot-swap insertion of USB-C power delivery modules in head unit backplane. IC Role / Device Role / Timing Role: Overvoltage protection element limiting surge transients to safe levels before PMIC input stage. Use Value: 830 mW power rating sustains 500 ms clamping at 100 mA peak current without thermal runaway. |
| Body Control Module (BCM) Wake-Up Circuit | ADAS Camera Power Supply |
Use Scenario: Generates wake-up threshold voltage for low-power microcontroller reset logic triggered by 51 V ignition switch detection. IC Role / Device Role / Timing Role: Precision voltage threshold detector via resistor divider into comparator input. Use Value: 350 Ω differential resistance ensures <50 mV hysteresis shift across 0–10 mA divider current range. |
Use Scenario: Stabilizes 51 V bias for image sensor analog front-end in surround-view camera ECU. IC Role / Device Role / Timing Role: Low-noise voltage regulator supplying clean reference to column amplifier chain. Use Value: ≤100 μA reverse leakage prevents >20 nA offset current injection into high-gain pixel readout circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT52H-C51-Q | ±5 % tolerance; higher max IR (100 μA → 100 μA same); identical VZ min/max (48–54 V) | Acceptable where system-level calibration compensates for wider voltage spread | Select for cost-sensitive non-safety-critical modules with post-assembly trimming capability |
| MMSZ5231B-TP | ±5 % tolerance; SOD-123 package (not SOD123F); 500 mW Ptot; no AEC-Q101 qualification | Limited to consumer or industrial applications without automotive environmental stress requirements | Choose only for prototyping or non-automotive designs where footprint compatibility exists but qualification is not required |
Compared with BZT52H-C51-Q, the BZT52H-B51-QX delivers tighter voltage control critical for uncalibrated analog interfaces; versus MMSZ5231B-TP, it offers automotive-grade reliability and 66 % higher power handling-essential for sustained clamping in 12 V/24 V vehicle architectures.
Availability
BZT52H-B51-QX is available at Aetrix Electronics and suitable for engine control units, body control modules, infotainment power sequencing, and ADAS camera power supplies requiring stable component supply with automotive-grade traceability and long-term lifecycle support.
Supply support for BZT52H-B51-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 energy-efficient technologies.
The BZT52H-Q series belongs to Nexperia's automotive Zener diode product line, engineered specifically for voltage reference, regulation, and overvoltage protection in harsh-environment electronic control units.
FAQ
What is the maximum reverse current specification for BZT52H-B51-QX at 39 V?
The maximum reverse current (IR) is 100 μA at VR = 39 V and Tj = 25 °C, measured per Table 9 of the official Nexperia datasheet. This value reflects leakage behavior below breakdown and is critical for low-power wake-up circuits where standby current must remain sub-μA.
Does BZT52H-B51-QX support reflow-only assembly?
Yes-Nexperia explicitly specifies reflow soldering as the only recommended method for SOD123F packages. The device is not qualified for wave or hand soldering due to thermal mass limitations and lead finish compatibility; Figure 12 provides the exact footprint dimensions for stencil design and oven profile setup.
How does the ±2 % tolerance impact regulation accuracy in a 51 V feedback loop?
At 51 V nominal, ±2 % tolerance yields a guaranteed VZ range of 50.0 V to 52.0 V. In a typical feedback divider with 1 % resistors, this contributes ≤0.8 % total output voltage error-within acceptable limits for non-isolated DC-DC converters powering automotive sensors and actuators.
Is thermal resistance from junction to solder point verified per JEDEC standards?
Yes-Rth(j-sp) = 150 K/W is measured per JESD51-2 and JESD51-14 on FR4 PCB with single-sided 1 cm² cathode pad, as stated in Table 6. This value enables accurate junction temperature estimation during transient overvoltage events using measured solder-point temperature and power dissipation.
BZT52H-B51-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:
- ±1.96%
- 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-B51-QX FAQ
1.How can I place an order for BZT52H-B51-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52H-B51-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-B51-QX reliable?
The price and inventory of BZT52H-B51-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-B51-QX is usually 5 days.
3.What payment methods are accepted for BZT52H-B51-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52H-B51-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52H-B51-QX?
BZT52H-B51-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52H-B51-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-B51-QX?
For technical support, including BZT52H-B51-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52H-B51-QX requirements.
6.How does Aetrix verify that BZT52H-B51-QX is sourced from the original manufacturer or authorized distributors?
All BZT52H-B51-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-B51-QX meets industry standards.
7.What is the process for return or replacement of BZT52H-B51-QX?
All BZT52H-B51-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZT52H-B51-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-B51-QX part is unused and in its original packaging.
Return procedure for BZT52H-B51-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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