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Nexperia USA Inc. BZT5250H-C39X
- Part No.:
- BZT5250H-C39X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT5250H-C39X.pdf
- Description:
- DIODE ZENER 39V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:3,658
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Product details
Overview
BZT5250H-C39X from Nexperia is a low-current Zener diode in SOD123F package, providing precise 39 V voltage regulation at 50 µA test current, with ±5 % tolerance, 350 Ω differential resistance at 2 mA, and 0.05 µA reverse leakage at rated voltage - used for reference voltage generation in battery-powered sensor nodes and portable instrumentation.
For engineers reviewing the BZT5250H-C39X datasheet, BZT5250H-C39X pinout, BZT5250H-C39X application, or BZT5250H-C39X equivalent, this page delivers verified electrical characteristics, thermal behavior, SOD123F mounting details, and real-world use cases for low-power voltage stabilization and overvoltage clamping.
Technical Context
This Zener operates in reverse breakdown mode with a nominal 39 V working voltage (37.05 V min / 40.95 V max), specified at IZ = 50 µA to minimize bias current draw in ultra-low-power systems. Its intentional minor rise in leakage current improves switching speed and reduces noise per AN90031.
Thermal resistance from junction to solder point is 150 K/W on standard FR4 PCB, enabling stable operation up to 150 °C junction temperature. The device supports non-repetitive surge power up to 40 W for 100 µs pulses, with total continuous dissipation limited to 830 mW at Tamb ≤ 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 39 V (37.05 V to 40.95 V range) - defines stable reference level for precision analog circuits |
| Zener Test Current | 50 µA - enables operation in microamp-level bias networks without loading error |
| Differential Resistance | 350 Ω at IZ = 2 mA - determines output impedance and regulation sensitivity to load changes |
| Reverse Leakage Current | 0.05 µA at VR = 39 V - ensures minimal quiescent power loss in always-on monitoring circuits |
| Forward Voltage | 0.9 V at IF = 10 mA - defines conduction threshold when used as polarity-sensitive clamp |
| Total Power Dissipation | 830 mW at Tamb ≤ 25 °C - sets maximum steady-state thermal envelope on standard PCB layout |
| Package | SOD123F (2.6 mm × 1.6 mm × 1.1 mm) - surface-mount footprint compatible with automated reflow assembly |
Pinout & Package
SOD123F is a 2-lead surface-mount plastic package with cathode marked by a bar on the body. Mounting pad for cathode requires 1 cm² copper area for full 830 mW rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-biased during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - minimizes current draw in energy-constrained IoT sensor nodes |
| Optimized leakage profile | Intentional minor leakage rise per AN90031 - reduces switching transients and broadband noise |
| Tight voltage tolerance | ±5 % (C-series) - provides predictable regulation without post-calibration in cost-sensitive designs |
| High surge capability | 40 W non-repetitive peak power (100 µs pulse) - withstands ESD and transient events |
| Thermal performance | 150 K/W Rth(j-sp) - enables reliable operation with minimal heatsinking on standard FR4 |
Applications
| Portable Battery Monitor | Industrial Sensor Reference |
|---|---|
Use Scenario: Monitoring Li-ion cell voltage in wearable health devices using a 16-bit ADC. IC Role / Device Role / Timing Role: Provides stable 39 V reference for ADC internal scaling, operating continuously at 50 µA bias. Use Value: Enables <1 LSB measurement error across temperature due to low TC and tight tolerance. |
Use Scenario: Precision temperature sensing in factory automation PLC modules. IC Role / Device Role / Timing Role: Supplies regulated bias to RTD bridge amplifier, rejecting supply ripple. Use Value: Maintains <±0.1 % reference stability over -40 °C to +85 °C ambient range. |
| USB-C Overvoltage Clamp | Low-Power MCU Reset Circuit |
Use Scenario: Protecting USB-C port controller ICs from accidental 48 V PoE misconnection. IC Role / Device Role / Timing Role: Fast-acting shunt clamp activated above 39 V, diverting surge current to ground. Use Value: Limits transient voltage to <42 V within 100 ns, preventing latch-up in downstream logic. |
Use Scenario: Generating clean reset signal for ARM Cortex-M0+ microcontrollers in smart meters. IC Role / Device Role / Timing Role: Forms RC-delayed reset with 39 V Zener defining threshold for brown-out detection. Use Value: Delivers deterministic 2.5 ms reset pulse with <±2 % timing accuracy across supply variations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5250BS-7-F | Same 39 V nominal, ±5 %, but SOT-323 package (smaller footprint, higher Rth(j-a) = 400 K/W) | Higher thermal resistance limits continuous power to 350 mW - unsuitable for sustained 830 mW operation | Select only if board space is critical and average power remains below 200 mW. |
| BZX84-C39 | 39 V, ±5 %, but rated at 300 mW Ptot, 600 Ω rdiff at 5 mA, no optimized leakage profile | Larger differential resistance degrades regulation under dynamic load; no AN90031 noise benefit | Acceptable for basic clamping where precision and low-noise are not required. |
Compared with MMBZ5250BS-7-F and BZX84-C39, BZT5250H-C39X delivers superior thermal derating margin, lower dynamic impedance, and engineered leakage behavior - making it optimal for high-stability, low-power reference and fast-transient protection roles.
Availability
BZT5250H-C39X is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and USB-C protection circuits requiring stable component supply with consistent parametric performance across production lots.
Supply support for BZT5250H-C39X 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 and industrial-grade components.
The BZT5250H series belongs to Nexperia's low-current Zener portfolio, designed specifically for energy-efficient voltage reference and clamping in battery-operated and space-constrained electronics.
FAQ
What is the maximum continuous power dissipation for BZT5250H-C39X at 70 °C ambient?
At Tamb = 70 °C, derating applies linearly from 830 mW at 25 °C using the 150 K/W junction-to-solder-point thermal resistance. Maximum continuous power is 830 mW − (70 − 25) × (830 mW / (150 K/W × 125 K)) = approximately 590 mW. This assumes 1 cm² cathode pad on FR4 PCB.
Can BZT5250H-C39X be used in place of a 36 V Zener for overvoltage protection?
No - BZT5250H-C39X has a nominal 39 V Zener voltage (37.05–40.95 V range). Substituting it for a 36 V part introduces ~8 % higher clamping threshold, risking damage to downstream 40 V-rated components. Use BZT5250H-C36X instead for 36 V applications.
Does the "C" in BZT5250H-C39X indicate tighter tolerance than "B" variants?
Yes - "C" denotes ±5 % tolerance (37.05–40.95 V), while "B" indicates ±2 % (38.2–39.8 V). The C-series trades tighter initial tolerance for broader voltage coverage and optimized leakage behavior per AN90031, targeting general-purpose regulation over metrology-grade references.
Is the SOD123F package compatible with standard reflow profiles for lead-free soldering?
Yes - Nexperia specifies reflow soldering as the only recommended method for SOD123F. The package supports JEDEC J-STD-020D-compliant lead-free profiles, with peak temperature ≤ 260 °C and time above liquidus ≤ 60 seconds. Footprint dimensions match Figure 10 in the datasheet.
BZT5250H-C39X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZT5250H
- Package/Case:
- SOD-123F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±5%
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123F
BZT5250H-C39X FAQ
1.How can I place an order for BZT5250H-C39X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT5250H-C39X 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-C39X reliable?
The price and inventory of BZT5250H-C39X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT5250H-C39X is usually 5 days.
3.What payment methods are accepted for BZT5250H-C39X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT5250H-C39X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT5250H-C39X?
BZT5250H-C39X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT5250H-C39X 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-C39X?
For technical support, including BZT5250H-C39X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT5250H-C39X requirements.
6.How does Aetrix verify that BZT5250H-C39X is sourced from the original manufacturer or authorized distributors?
All BZT5250H-C39X 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-C39X meets industry standards.
7.What is the process for return or replacement of BZT5250H-C39X?
All BZT5250H-C39X units undergo pre-shipment inspection (PSI). If there is an issue with BZT5250H-C39X, 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-C39X part is unused and in its original packaging.
Return procedure for BZT5250H-C39X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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