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Nexperia USA Inc. BZT5250H-B4V3-QX
- Part No.:
- BZT5250H-B4V3-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT5250H-B4V3-QX.pdf
- Description:
- DIODE ZENER 4.3V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:3,720
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Product details
Overview
BZT5250H-B4V3-QX from Nexperia is a low-current Zener diode in SOD123F package, providing 4.3 V ±2 % nominal regulation at 50 µA test current, with 830 mW total power dissipation and AEC-Q101 qualification for automotive voltage reference and biasing applications.
For engineers reviewing the BZT5250H-B4V3-QX datasheet, BZT5250H-B4V3-QX pinout, BZT5250H-B4V3-QX application, or BZT5250H-B4V3-QX equivalent, this device serves as a precision low-power voltage reference in battery-powered sensors, automotive ECUs, and portable instrumentation where stable low-current regulation is required.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified nominal Zener voltage of 4.3 V at IZ = 50 µA, exhibiting a typical differential resistance of 95 Ω at IZ = 5 mA and a temperature coefficient of –2.7 mV/K. Its low test current enables minimal quiescent power draw in always-on circuits.
The device features intentional minor leakage optimization per AN90031 for improved switching speed and noise reduction, and is qualified to AEC-Q101 for operation across –55 °C to +150 °C ambient, with thermal resistance from junction to solder point at 150 K/W on standard FR4 PCB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.21 V to 4.39 V at IZ = 50 µA - tight ±2 % tolerance ensures accurate low-current reference without trimming |
| Differential Resistance (rdiff) | 95 Ω max at IZ = 5 mA - low dynamic impedance maintains regulation stability under small load variations |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - enables predictable forward conduction for polarity protection or clamping |
| Total Power Dissipation (Ptot) | 830 mW at Tamb ≤ 25 °C - supports moderate power handling in compact SMD layout without forced cooling |
| Reverse Current (IR) | 4.0 µA max at VR = 2.0 V - ultra-low leakage preserves battery life in standby circuits |
| Thermal Resistance (Rth(j-sp)) | 150 K/W - defines junction-to-solder-point thermal path for reliable operation on standard FR4 with tin-plated copper |
| Operating Temperature | –55 °C to +150 °C - validated for under-hood automotive environments and industrial edge nodes |
Pinout & Package
SOD123F surface-mount plastic package: 2.6 mm × 1.6 mm × 1.1 mm body, flat lead, 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 - reverse-biased during Zener operation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes bias path for controlled breakdown conduction |
Key Features
| Feature | Design Value |
|---|---|
| Low-test-current regulation | Specified at 50 µA - enables use in microamp-level bias networks without compromising accuracy |
| AEC-Q101 qualification | Qualified for automotive applications - guarantees reliability in engine control, ADAS, and body electronics |
| Optimized leakage profile | Intentional minor rise per AN90031 - reduces switching transients and broadband noise in sensitive analog stages |
| Tight voltage tolerance | ±2 % (B-series) - eliminates need for external trimming in precision reference designs |
| Small-form-factor SMD | SOD123F footprint - saves board space while maintaining thermal performance via standardized FR4 mounting pad |
Applications
| Automotive Engine Control Unit (ECU) Reference | Portable Gas Sensor Biasing |
|---|---|
|
Use Scenario: Providing stable 4.3 V reference for analog front-end ADCs and op-amps in engine management systems exposed to wide temperature swings. IC Role / Device Role / Timing Role: Zener voltage reference diode - establishes precise DC bias point for signal conditioning circuitry. Use Value: AEC-Q101 qualification and –55 °C to +150 °C operation ensure long-term stability in under-hood environments without derating. |
Use Scenario: Supplying low-current bias voltage to electrochemical gas sensor elements in handheld air quality monitors. IC Role / Device Role / Timing Role: Low-power voltage regulator diode - delivers stable excitation voltage while drawing <5 µA in sleep mode. Use Value: 50 µA test current specification and 4.0 µA max reverse leakage at 2 V enable multi-year battery life in intermittent-readout devices. |
| Industrial IoT Node Voltage Clamp | Medical Wearable Signal Conditioning |
|
Use Scenario: Clamping input protection stage for RS-485 transceivers in factory automation gateways operating from unregulated 5 V rails. IC Role / Device Role / Timing Role: Reverse-biased Zener clamp - limits transient overvoltage to protect downstream logic inputs. Use Value: 95 Ω differential resistance and 830 mW power rating allow safe absorption of short-duration ESD pulses without latch-up. |
Use Scenario: Setting reference voltage for low-noise instrumentation amplifiers in ECG patch sensors powered by coin cells. IC Role / Device Role / Timing Role: Precision DC reference source - defines common-mode level and gain-setting node in analog signal chain. Use Value: Optimized leakage profile per AN90031 suppresses broadband noise coupling into high-gain biopotential amplifiers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C4V3 | ±5 % tolerance, 300 mW Ptot, SOT23 package | Higher power dissipation derating required above 70 °C; no AEC-Q101 qualification | Select when cost sensitivity outweighs automotive qualification and tighter tolerance needs |
| MMSZ4685 | ±5 % tolerance, 500 mW Ptot, SOD123 package (not SOD123F), rdiff = 120 Ω | Larger thermal resistance (200 K/W); not optimized for low-leakage fast-switching | Choose for legacy SOD123 footprint compatibility where AN90031 noise benefits are non-critical |
Compared with BZT5250H-B4V3-QX, BZX84-C4V3 offers lower cost but sacrifices automotive qualification and voltage accuracy, while MMSZ4685 matches form factor less precisely and lacks the intentional leakage optimization critical for low-noise analog biasing.
Availability
BZT5250H-B4V3-QX is available at Aetrix Electronics and suitable for automotive ECU design, portable sensor modules, industrial IoT edge nodes, and medical wearable electronics requiring stable component supply with full traceability and lifecycle support.
Supply support for BZT5250H-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 high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and energy-efficient solutions.
The BZT5250H-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for low-current voltage reference and biasing in automotive, industrial, and portable electronics where precision, stability, and qualification integrity are mandatory.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The BZT5250H-B4V3-QX has a nominal Zener voltage of 4.3 V, with guaranteed breakdown occurring between 4.21 V and 4.39 V at 50 µA test current. It is not rated for sustained reverse voltage above its specified VZ range; operation beyond 4.39 V risks exceeding absolute maximum ratings and thermal limits.
Does this part require a heatsink in standard PCB layouts?
No heatsink is required. When mounted on standard FR4 PCB with single-sided 1 cm² cathode pad, its Rth(j-sp) is 150 K/W and Ptot is rated at 830 mW up to 25 °C ambient. At typical 50 µA bias, power dissipation is <0.22 mW - well within safe thermal margins without additional cooling.
How does the "B" suffix differ from "C" in the BZT5250H-Q series?
The "B" suffix denotes ±2 % Zener voltage tolerance (e.g., BZT5250H-B4V3-QX = 4.21–4.39 V), while "C" indicates approximately ±5 % tolerance (e.g., BZT5250H-C4V3-QX = 4.09–4.52 V). Both share identical package, thermal specs, and AEC-Q101 qualification - only voltage accuracy differs.
Can this diode be used in forward conduction mode?
Yes - it exhibits a maximum forward voltage of 0.9 V at 10 mA, making it suitable for polarity protection or low-drop rectification in low-current paths. However, its primary design intent and characterization are for reverse-bias Zener regulation; forward characteristics are secondary and not optimized for high-current switching.
BZT5250H-B4V3-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZT5250H-Q
- Package/Case:
- SOD-123F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 4.3 V
- Tolerance:
- ±2%
- Power - Max:
- 375 mW
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 4 µA @ 2 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
BZT5250H-B4V3-QX FAQ
1.How can I place an order for BZT5250H-B4V3-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT5250H-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 BZT5250H-B4V3-QX reliable?
The price and inventory of BZT5250H-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 BZT5250H-B4V3-QX is usually 5 days.
3.What payment methods are accepted for BZT5250H-B4V3-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT5250H-B4V3-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT5250H-B4V3-QX?
BZT5250H-B4V3-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT5250H-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 BZT5250H-B4V3-QX?
For technical support, including BZT5250H-B4V3-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT5250H-B4V3-QX requirements.
6.How does Aetrix verify that BZT5250H-B4V3-QX is sourced from the original manufacturer or authorized distributors?
All BZT5250H-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 BZT5250H-B4V3-QX meets industry standards.
7.What is the process for return or replacement of BZT5250H-B4V3-QX?
All BZT5250H-B4V3-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZT5250H-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 BZT5250H-B4V3-QX part is unused and in its original packaging.
Return procedure for BZT5250H-B4V3-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZT5250H-B4V3-QX Tags
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