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Nexperia USA Inc. BZT52H-B4V3-QX
- Part No.:
- BZT52H-B4V3-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52H-B4V3-QX.pdf
- Description:
- DIODE ZENER 4.3V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:2,350
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Product details
Overview
BZT52H-B4V3-QX from Nexperia is a ±2 % tolerance Zener diode in SOD123F package, rated for 4.3 V nominal breakdown voltage at 5 mA, 830 mW total power dissipation, and qualified to AEC-Q101 for automotive voltage regulation and reference applications.
For engineers reviewing the BZT52H-B4V3-QX datasheet, BZT52H-B4V3-QX pinout, BZT52H-B4V3-QX application, or BZT52H-B4V3-QX equivalent, this page delivers verified Zener parameters, thermal resistance values, reverse current limits at 1 V, differential resistance, temperature coefficient, and automotive-grade qualification status - all critical for precision biasing, overvoltage clamping, and stable reference design.
Technical Context
This Zener diode operates in reverse breakdown mode with a tightly controlled 4.3 V nominal Zener voltage (VZ) at IZ = 5 mA, exhibiting a maximum differential resistance (rdif) of 95 Ω and a temperature coefficient (SZ) between –3.5 mV/K and 0.0 mV/K across its operating range.
It supports continuous forward conduction up to 250 mA and withstands non-repetitive peak reverse currents up to 6.0 A (tp = 100 μs), with thermal resistance from junction to solder point (Rth(j-sp)) at 70 K/W when mounted on an FR4 PCB with 1 cm² cathode pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 4.21 V to 4.39 V at IZ = 5 mA - ensures stable reference within ±2 % tolerance for precision analog circuits |
| Differential Resistance rdif | ≤ 95 Ω - low dynamic impedance maintains regulation accuracy under varying load current |
| Reverse Current IR | ≤ 3 μA at VR = 1 V - minimal leakage preserves low-power standby integrity |
| Forward Voltage VF | ≤ 0.9 V at IF = 10 mA - enables efficient forward conduction in protection or dual-mode circuits |
| Total Power Dissipation Ptot | 830 mW at Tamb ≤ 25 °C - defines maximum steady-state thermal load on standard FR4 PCB |
| Junction Temperature Tj | –65 °C to +150 °C - supports operation in under-hood automotive environments |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including high-temperature reverse bias stress and temperature cycling |
Pinout & Package
SOD123F surface-mount plastic package: 2-terminal, flat lead, small outline (3.6 mm × 1.7 mm × 1.0 mm), 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; carries reverse-biased Zener current |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-bias path for voltage reference or clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including HTGB, TC, and HTRB testing - enables deployment in engine control, body electronics, and ADAS modules |
| ±2 % VZ tolerance | Tighter than standard ±5 % Zeners - reduces calibration overhead in voltage reference designs requiring <1 % system error budget |
| 830 mW power rating | Higher than legacy SOD-123 devices (typically 500 mW) - allows higher Zener current without derating in compact layouts |
| Low Rth(j-sp) = 70 K/W | Enables effective heat transfer from junction to PCB copper - supports sustained operation near thermal limits in dense automotive PCBs |
| 1 cm² cathode pad thermal design | Optimized footprint per Nexperia's recommended layout - achieves rated 830 mW dissipation without external heatsinking |
Applications
| Automotive ECU Voltage Reference | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Providing stable 4.3 V reference for ADC biasing and op-amp feedback networks in engine control units. IC Role / Device Role / Timing Role: Zener diode functions as two-terminal shunt voltage reference, absorbing excess current to maintain fixed node voltage. Use Value: ±2 % VZ tolerance and –3.5 to 0.0 mV/K temperature coefficient ensure reference drift remains below 10 mV over –40 °C to +125 °C ambient. |
Use Scenario: Biasing bridge sensor excitation in industrial pressure transmitters operating from unregulated 12 V rails. IC Role / Device Role / Timing Role: Acts as passive voltage clamp and reference source for Wheatstone bridge instrumentation amplifiers. Use Value: 95 Ω differential resistance and 3 μA leakage at 1 V enable stable excitation voltage despite supply ripple and load variation. |
| USB Port Overvoltage Protection | Power Supply Feedback Divider Clamp |
Use Scenario: Clamping transient surges on 5 V USB VBUS lines in automotive infotainment head units. IC Role / Device Role / Timing Role: Shunt protector that conducts above 4.3 V to divert surge energy away from downstream USB PHY ICs. Use Value: 6.0 A non-repetitive peak reverse current rating (tp = 100 μs) absorbs common 10/1000 μs surge waveforms without failure. |
Use Scenario: Stabilizing feedback node voltage in isolated flyback converters using TL431-based regulation. IC Role / Device Role / Timing Role: Parallel Zener placed across lower feedback resistor to prevent regulation loss during light-load conditions. Use Value: 830 mW power rating allows safe dissipation of excess current when TL431 is inactive, preventing output overvoltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT52H-A4V3-Q | ±1 % VZ tolerance (tighter), same SOD123F package and 4.25–4.35 V range | Preferred where reference accuracy dominates over cost; requires tighter process control during manufacturing | Select when system-level calibration is impractical and initial VZ accuracy must be <±0.5 % |
| BZT52H-C4V3-Q | ±5 % VZ tolerance (looser), identical thermal and electrical specs otherwise | Suitable for non-critical clamping where cost sensitivity outweighs regulation precision | Choose for cost-sensitive consumer or industrial applications where 4.0–4.6 V range is acceptable |
Compared with BZT52H-A4V3-Q, the BZT52H-B4V3-QX trades 1 % absolute accuracy for broader process yield and lower unit cost; versus BZT52H-C4V3-Q, it delivers twice the VZ precision without sacrificing thermal performance or automotive qualification.
Availability
BZT52H-B4V3-QX is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, USB port protection, and isolated power supply feedback networks requiring stable component supply and AEC-Q101 compliance.
Supply support for BZT52H-B4V3-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 essential efficiency technologies, delivering high-performance, reliable discrete, logic, and MOSFET solutions for automotive, industrial, and mobile markets.
The BZT52H-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for automotive voltage reference and clamping applications demanding robustness, tight tolerances, and long-term stability under thermal stress.
FAQ
What is the maximum reverse voltage before breakdown for BZT52H-B4V3-QX?
The specified Zener voltage is 4.21 V to 4.39 V at 5 mA test current; below 4.21 V, reverse current remains ≤3 μA at 1 V, confirming stable non-conducting behavior. Breakdown onset is gradual, not abrupt, and full regulation occurs only above 4.21 V with sufficient current.
Can BZT52H-B4V3-QX replace older BZT52C4V3 in existing designs?
Yes, with caveats: both share SOD123F package and 4.3 V nominal rating, but BZT52H-B4V3-QX offers ±2 % tolerance (vs ±5 %), AEC-Q101 qualification, and improved thermal resistance (70 K/W vs ~120 K/W). Layout compatibility is confirmed; no redesign needed unless legacy part was operated near its power limit.
What is the thermal resistance from junction to ambient (Rth(j-a)) under standard mounting?
Rth(j-a) is 330 K/W when mounted on FR4 PCB with single-sided copper and standard footprint, per Table 6. This value assumes no thermal relief or extended copper; adding a 1 cm² cathode pad reduces Rth(j-sp) to 70 K/W but does not alter Rth(j-a) significantly without forced airflow or heatsinking.
Does BZT52H-B4V3-QX support bidirectional ESD protection?
No - it is a unidirectional Zener diode optimized for reverse-bias regulation and clamping. Its forward voltage is 0.9 V at 10 mA, but it lacks symmetric breakdown characteristics or specified ESD ratings (e.g., IEC 61000-4-2). For bidirectional ESD protection, dedicated TVS diodes such as PESD5V0S1BA should be used instead.
BZT52H-B4V3-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:
- ±2.09%
- 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-B4V3-QX FAQ
1.How can I place an order for BZT52H-B4V3-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52H-B4V3-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-B4V3-QX reliable?
The price and inventory of BZT52H-B4V3-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-B4V3-QX is usually 5 days.
3.What payment methods are accepted for BZT52H-B4V3-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52H-B4V3-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52H-B4V3-QX?
BZT52H-B4V3-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52H-B4V3-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-B4V3-QX?
For technical support, including BZT52H-B4V3-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52H-B4V3-QX requirements.
6.How does Aetrix verify that BZT52H-B4V3-QX is sourced from the original manufacturer or authorized distributors?
All BZT52H-B4V3-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-B4V3-QX meets industry standards.
7.What is the process for return or replacement of BZT52H-B4V3-QX?
All BZT52H-B4V3-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZT52H-B4V3-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-B4V3-QX part is unused and in its original packaging.
Return procedure for BZT52H-B4V3-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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