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Nexperia USA Inc. BZT5250H-B39-QX
- Part No.:
- BZT5250H-B39-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT5250H-B39-QX.pdf
- Description:
- DIODE ZENER 39V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:7,998
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Product details
Overview
BZT5250H-B39-QX from Nexperia is a low-current Zener diode in SOD123F package, designed for precision voltage regulation at 39 V nominal Zener voltage (±2 % tolerance), with 50 µA test current, 350 Ω differential resistance at 2 mA, and AEC-Q101 qualification for automotive power rail clamping and biasing.
For engineers reviewing the BZT5250H-B39-QX datasheet, BZT5250H-B39-QX pinout, BZT5250H-B39-QX application, or BZT5250H-B39-QX equivalent, this device is selected for low-leakage, stable reference generation in battery-powered sensor nodes, automotive ECU voltage supervisors, and portable instrument front-end protection circuits where thermal stability and small footprint are critical.
Technical Context
This Zener diode operates with a specified reverse breakdown voltage of 38.2 V to 39.8 V at IZ = 2 mA, exhibiting a positive temperature coefficient of +0.05 mV/K and diode capacitance of 45 pF at 0 V, enabling predictable voltage reference behavior across ambient temperatures from −55 °C to +150 °C.
Its thermal resistance from junction to solder point is 70 K/W, and total power dissipation is rated up to 830 mW at Tamb ≤ 25 °C on FR4 PCB with 1 cm² cathode pad - supporting reliable operation in thermally constrained automotive modules and industrial control boards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 38.2 V to 39.8 V at IZ = 2 mA - defines precise clamping threshold for 39 V rail protection |
| Tolerance | ±2 % - enables tight voltage margin control in safety-critical automotive monitoring circuits |
| Differential Resistance rdiff | 350 Ω at IZ = 2 mA - ensures minimal voltage shift under load variation in reference applications |
| Test Current IZ | 2 mA - optimized for low-power biasing without excessive quiescent draw in battery systems |
| Reverse Current IR | ≤ 0.05 µA at VR = 29.2 V - guarantees ultra-low leakage during standby in always-on vehicle modules |
| Power Dissipation Ptot | 830 mW at Tamb ≤ 25 °C - supports continuous operation in compact SOD123F footprint without forced cooling |
| Package | SOD123F - 2.6 mm × 1.6 mm × 1.1 mm surface-mount outline with cathode-marked anode/cathode terminals |
Pinout & Package
SOD123F package: 2-terminal surface-mount plastic case, 2.6 mm × 1.6 mm body, 1.1 mm height, cathode identified by marking bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; polarity-sensitive terminal defining Zener conduction direction |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-bias path for voltage clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per JESD22 standards |
| Low test current operation | Specified at 50 µA and 2 mA - enables use in microamp-level bias networks for ultra-low-power sensors |
| Optimized leakage profile | Intentional minor rise in leakage improves switching speed and reduces noise in transient suppression paths |
| Thermal performance | Rth(j-sp) = 70 K/W - allows direct thermal coupling to PCB copper for stable voltage reference over temperature |
Applications
| Automotive Body Control Module (BCM) Voltage Supervisor | Portable Gas Detector Reference Circuit |
|---|---|
Use Scenario: Monitors 39 V auxiliary supply rail in BCM to detect overvoltage faults before ECU reset. IC Role / Device Role / Timing Role: Zener clamp providing precise 39 V threshold detection signal to comparator input. Use Value: ±2 % tolerance ensures fault detection within 0.8 V margin; AEC-Q101 rating guarantees operation across −40 °C to +125 °C engine bay conditions. |
Use Scenario: Supplies stable bias voltage to electrochemical sensor amplifier in handheld gas analyzers. IC Role / Device Role / Timing Role: Low-current Zener reference generating 39 V bias for op-amp rail-to-rail input stage. Use Value: 50 µA test current minimizes battery drain; 45 pF capacitance avoids signal distortion at sensor bandwidths up to 10 kHz. |
| Industrial PLC Analog Input Protection | Smart Meter Power Supply Clamp |
Use Scenario: Clamps transient surges on 39 V analog input channel of programmable logic controller. IC Role / Device Role / Timing Role: Fast-response Zener shunt protecting ADC front-end from ESD and inductive kickback. Use Value: 350 Ω dynamic impedance limits clamping voltage overshoot to < 1.5 V above VZ; SOD123F footprint fits high-density I/O modules. |
Use Scenario: Stabilizes 39 V DC-DC converter output in revenue-grade smart electricity meters. IC Role / Device Role / Timing Role: Precision voltage regulator maintaining reference accuracy for metrology IC calibration. Use Value: +0.05 mV/K tempco ensures < 0.2 % drift over −25 °C to +70 °C operating range; qualified for 15-year field life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT5250H-C39-Q | ±5 % tolerance (vs. ±2 %), identical VZ range and SOD123F package | Acceptable where cost sensitivity outweighs tight voltage margin requirements | Select for non-safety-critical consumer power supplies where 1.95 V tolerance is acceptable |
| MMSZ5250B-TP | Same 39 V nominal, ±5 % tolerance, SOD-123 package but not AEC-Q101 qualified | Limited to commercial-grade applications; lacks automotive stress test validation | Use only in non-automotive designs with ambient < 85 °C and no vibration/thermal cycling requirements |
Compared with BZT5250H-C39-Q and MMSZ5250B-TP, the BZT5250H-B39-QX delivers tighter regulation and automotive qualification - making it the sole choice for functional safety–related voltage supervision where ±2 % accuracy and AEC-Q101 traceability are mandatory.
Availability
BZT5250H-B39-QX is available at Aetrix Electronics and suitable for automotive electronics, portable instrumentation, industrial PLCs, and smart metering systems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZT5250H-B39-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 and logic devices for automotive, industrial, and consumer markets.
The BZT5250H-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for low-current, high-stability voltage regulation in harsh-environment automotive and industrial control applications.
FAQ
What is the maximum reverse voltage rating before breakdown for BZT5250H-B39-QX?
The BZT5250H-B39-QX has a nominal Zener voltage of 39 V with a guaranteed range of 38.2 V to 39.8 V at IZ = 2 mA. Its absolute maximum reverse voltage is not defined separately - operation beyond VZ + 5 % risks exceeding power limits. The device is rated for non-repetitive peak reverse power of 40 W at 100 µs pulse width, per IEC 60134 limiting values.
Does BZT5250H-B39-QX require a heatsink in standard PCB mounting?
No heatsink is required. When mounted on an FR4 PCB with single-sided 1 cm² cathode copper pad, its Rth(j-sp) is 70 K/W and total power dissipation remains within 830 mW at Tamb ≤ 25 °C. At 2 mA bias, power dissipation is only 78 mW - well below thermal limits even in still-air conditions.
How does the "intentional minor rise of leakage current" affect circuit performance?
This design feature reduces minority-carrier lifetime, lowering diode capacitance and improving response time to fast transients. Measured Cd = 45 pF at 1 MHz confirms reduced storage effects, enabling cleaner clamping of ESD pulses and faster recovery after overvoltage events - critical in automotive CAN bus protection and sensor interface rails.
Can BZT5250H-B39-QX be used in parallel for higher power handling?
No. Zener diodes exhibit negative temperature coefficients below ~5 V and positive above - but even at 39 V, slight VZ mismatches cause current hogging. Parallel operation is not recommended. For >830 mW needs, use a single higher-rated device like PZU39B2 or implement active regulation with a transistor-based shunt.
BZT5250H-B39-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):
- 39 V
- Tolerance:
- ±2%
- Power - Max:
- 375 mW
- Impedance (Max) (Zzt):
- 130 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 29.6 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-B39-QX FAQ
1.How can I place an order for BZT5250H-B39-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT5250H-B39-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-B39-QX reliable?
The price and inventory of BZT5250H-B39-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-B39-QX is usually 5 days.
3.What payment methods are accepted for BZT5250H-B39-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT5250H-B39-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT5250H-B39-QX?
BZT5250H-B39-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT5250H-B39-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-B39-QX?
For technical support, including BZT5250H-B39-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT5250H-B39-QX requirements.
6.How does Aetrix verify that BZT5250H-B39-QX is sourced from the original manufacturer or authorized distributors?
All BZT5250H-B39-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-B39-QX meets industry standards.
7.What is the process for return or replacement of BZT5250H-B39-QX?
All BZT5250H-B39-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZT5250H-B39-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-B39-QX part is unused and in its original packaging.
Return procedure for BZT5250H-B39-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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