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Diodes Incorporated BZT52HC39WF-7
- Part No.:
- BZT52HC39WF-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52HC39WF-7.pdf
- Description:
- DIODE ZENER 39V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:2,957
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Product details
Overview
BZT52HC39WF-7 from Diodes Incorporated is a surface-mount 39 V Zener diode in SOD123F package, rated for 2 mA test current, 75 Ω dynamic impedance at 2 mA, −45 pF capacitance at 1 MHz, and 0.05 µA reverse leakage at 27.3 V, used for precision voltage regulation and overvoltage protection in automotive power rails and industrial sensor interfaces.
For engineers reviewing the BZT52HC39WF-7 datasheet, BZT52HC39WF-7 pinout, BZT52HC39WF-7 application, or BZT52HC39WF-7 equivalent, key selection criteria include zener voltage tolerance (±5.1%), thermal resistance (150 °C/W with 1 cm² cathode pad), AEC-Q101 qualification, and low-profile SOD123F footprint compatibility with high-density PCB layouts.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its −45 pF junction capacitance and 75 Ω Zener impedance at 2 mA support fast transient response in feedback loops and ESD-clamped signal conditioning paths.
The device is characterized at 2 mA test current (not 5 mA like lower-voltage variants), reflecting its optimized operation point for higher-voltage regulation. Its temperature coefficient of +33.4 mV/°C enables predictable drift compensation in temperature-stable references when paired with complementary components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 37.0–41.0 V at 2 mA - defines regulated output range for 3.6 V margin above nominal 36 V rail |
| Zener Impedance | 75 Ω at 2 mA - limits output voltage deviation under ±10 mA load variation |
| Reverse Leakage | 0.05 µA at 27.3 V - ensures minimal quiescent current in always-on protection circuits |
| Junction Capacitance | 45 pF at 1 MHz, 0 V - supports <10 ns rise time in clamping applications up to 100 MHz |
| Power Dissipation | 830 mW with 1 cm² cathode pad - enables sustained 22 mA regulation at 39 V without derating below 125°C |
| Thermal Resistance | 150 °C/W (junction-to-ambient, enhanced pad) - allows direct thermal coupling to ground plane for automotive under-hood use |
| AEC-Q101 Qualified | Yes - validated for automotive power management systems per stress test requirements including HTOL and TC |
Pinout & Package
Package: SOD123F (Type B), flat lead, molded green plastic case, UL 94V-0 rated, 0.015 g weight. Cathode identified by band marking on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference node for reverse-biased operation | Connected to lower-potential rail (e.g., GND or return path) during regulation |
| Cathode | Zener voltage output terminal | Connected to protected node; requires ≥1 cm² copper pour for full 830 mW rating |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SOD123F package | Height ≤0.9 mm - enables placement beneath connectors and in ultra-thin automotive ECUs |
| AEC-Q101 qualification | Validated for automotive power modules - eliminates need for additional reliability screening |
| Halogen- and antimony-free "Green" construction | <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - meets EU ELV and JIG-101 compliance requirements |
| Matte tin annealed terminals | Solderable per MIL-STD-202 Method 208 - ensures robust reflow joint integrity in lead-free assembly |
| Moisture sensitivity Level 1 | No bake required before SMT - reduces manufacturing overhead and floor-life constraints |
Applications
| Automotive Body Control Module (BCM) | Industrial 4–20 mA Transmitter |
|---|---|
Use Scenario: Regulating 39 V supply for LIN bus transceivers and LED drivers in BCMs exposed to load dump transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp and reference stabilizer for 36 V nominal battery-supplied subsystems. Use Value: Withstands ISO 7637-2 Pulse 5a (120 V/500 ms) via coordinated TVS interaction while maintaining <±2% regulation accuracy across −40°C to +125°C. |
Use Scenario: Providing stable 39 V reference for DAC-based current loop calibration in hazardous-area transmitters. IC Role / Device Role / Timing Role: Precision shunt reference enabling 16-bit linearity in analog output stages. Use Value: 0.05 µA leakage and +33.4 mV/°C TC allow two-point temperature compensation achieving <0.05% FSR drift over 0–70°C ambient. |
| Telecom Power Sequencing | Medical Infusion Pump PSU |
Use Scenario: Enabling controlled startup sequencing of dual-output DC/DC converters in base station RF modules. IC Role / Device Role / Timing Role: Voltage supervisor trigger element for enable logic tied to 39 V auxiliary rail. Use Value: Sharp 37–41 V breakdown window ensures reliable turn-on within 100 ns of rail ramp, preventing latch-up in downstream LDOs. |
Use Scenario: Protecting microcontroller I/O pins from induced surges in motor-driven infusion pump power supplies. IC Role / Device Role / Timing Role: Secondary clamping device parallel to primary TVS, absorbing residual energy after main surge event. Use Value: 45 pF capacitance avoids signal distortion on 10 kHz PWM motor control lines while dissipating >100 mJ in repetitive 1 kV EFT bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5267B-7-F (Diodes Inc.) | Same 39 V nominal, but SOD123 package (not SOD123F); 100 Ω Zz at 2 mA; no AEC-Q101 qualification | Lacks automotive qualification and has higher impedance - suitable only for commercial-grade consumer power supplies | Select when cost is prioritized over automotive reliability and thermal performance |
| BZX84-C39 (Nexperia) | SOT23 package; 36–42 V range; 90 Ω Zz at 5 mA; AEC-Q101 qualified; 150 pF capacitance | Higher capacitance degrades high-frequency noise rejection; smaller package limits power handling to 350 mW | Select only if board space is constrained and thermal load remains below 100 mW |
Compared with MMSZ5267B-7-F and BZX84-C39, BZT52HC39WF-7 delivers superior thermal performance (150 °C/W vs. ≥200 °C/W), lower capacitance (45 pF vs. ≥150 pF), and guaranteed automotive qualification - making it the sole choice for safety-critical 36 V system regulation where long-term stability and surge resilience are mandatory.
Availability
BZT52HC39WF-7 is available at Aetrix Electronics and suitable for automotive body control modules, industrial 4–20 mA transmitters, and medical infusion pump power supplies requiring stable component supply with full AEC-Q101 traceability and green compliance documentation.
Supply support for BZT52HC39WF-7 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in Taiwan and China.
The BZT52HC series targets high-reliability automotive and industrial applications, emphasizing AEC-Q101 qualification, green material compliance, and low-profile packaging for next-generation compact power systems.
FAQ
What is the maximum continuous power dissipation for BZT52HC39WF-7 on a standard FR-4 PCB?
The device delivers 830 mW when mounted with a 1 cm² cathode pad per Diodes Incorporated's recommended layout. Without that pad, power rating drops to 375 mW due to higher thermal resistance (330 °C/W). Derating begins linearly above 25°C ambient, reaching zero at 125°C with the enhanced pad.
Is BZT52HC39WF-7 compatible with lead-free reflow profiles?
Yes - its matte tin annealed terminals meet MIL-STD-202 Method 208 solderability requirements and withstand peak reflow temperatures up to 260°C for 10 seconds. The SOD123F package is rated for JEDEC Level 1 moisture sensitivity, eliminating pre-bake requirements.
How does the temperature coefficient affect regulation accuracy over temperature?
With a +33.4 mV/°C coefficient, the Zener voltage increases by ~3.34 V from −40°C to +125°C. For a 39 V nominal, this yields ±4.3% drift over that range. System-level compensation (e.g., series resistor or op-amp correction) is required for applications demanding <1% total error.
Can BZT52HC39WF-7 be used as a substitute for BZT52C39 in an existing design?
No - BZT52C39 is rated at 5 mA test current and uses SOD123 (not SOD123F) packaging. BZT52HC39WF-7's 2 mA test current, tighter 37–41 V tolerance, lower Zz, and AEC-Q101 qualification mean circuit recalibration and layout review (especially thermal pad) are required before substitution.
BZT52HC39WF-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±5.13%
- Power - Max:
- 375 mW
- Impedance (Max) (Zzt):
- 75 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 27.3 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123F
BZT52HC39WF-7 FAQ
1.How can I place an order for BZT52HC39WF-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52HC39WF-7 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 BZT52HC39WF-7 reliable?
The price and inventory of BZT52HC39WF-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52HC39WF-7 is usually 5 days.
3.What payment methods are accepted for BZT52HC39WF-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52HC39WF-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52HC39WF-7?
BZT52HC39WF-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52HC39WF-7 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 BZT52HC39WF-7?
For technical support, including BZT52HC39WF-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52HC39WF-7 requirements.
6.How does Aetrix verify that BZT52HC39WF-7 is sourced from the original manufacturer or authorized distributors?
All BZT52HC39WF-7 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 BZT52HC39WF-7 meets industry standards.
7.What is the process for return or replacement of BZT52HC39WF-7?
All BZT52HC39WF-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZT52HC39WF-7, 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 BZT52HC39WF-7 part is unused and in its original packaging.
Return procedure for BZT52HC39WF-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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