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Diodes Incorporated BZX84C39-7-F
- Part No.:
- BZX84C39-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C39-7-F.pdf
- Description:
- DIODE ZENER 39V 300MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,989
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Product details
Overview
BZX84C39-7-F from Diodes Incorporated is a 39 V, 2 mA nominal Zener voltage regulator diode in SOT23 package, rated for 350 mW power dissipation at ambient temperature, with 130 Ω maximum Zener impedance at 2 mA test current and ±5% voltage tolerance (37.0–41.0 V), used for precision voltage reference and overvoltage protection in low-power analog circuits.
For engineers reviewing the BZX84C39-7-F datasheet, BZX84C39-7-F pinout, BZX84C39-7-F application, or BZX84C39-7-F equivalent, this page delivers verified electrical parameters, thermal derating behavior, SOT23 terminal mapping, and AEC-Q101-qualified alternatives for automotive and industrial voltage regulation design.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal 39 V regulation voltage at 2 mA test current, exhibiting a negative temperature coefficient of −3.5 mV/°C and total capacitance under 10 pF at 1 V reverse bias. Its planar die construction ensures stable voltage regulation across temperature and time.
The device is characterized for operation from −65 °C to +150 °C, with thermal resistance junction-to-ambient of 357 °C/W when terminals are held at ambient temperature, and 417 °C/W on FR-4 PCB with recommended pad layout - enabling accurate power derating in real-world layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39 V nominal, 37.0–41.0 V range at 2 mA - defines precise clamping threshold for voltage-sensitive nodes |
| Power Dissipation (PD) | 350 mW at ambient temperature - sets maximum continuous power handling without forced cooling |
| Zener Impedance (ZZT) | 130 Ω max at 2 mA - determines regulation stiffness and output voltage variation under load changes |
| Reverse Current (IR) | 0.1 µA max at 33.4 V - ensures minimal leakage in high-impedance bias networks |
| Temperature Coefficient | −3.5 mV/°C - quantifies voltage drift per degree, critical for temperature-stable references |
| Package | SOT23 - surface-mount, 3-terminal, 0.008 g weight, RoHS-compliant, AEC-Q101 qualified |
Pinout & Package
Package: SOT23 - three-terminal plastic-molded case with matte tin-plated Alloy 42 leadframe, UL 94V-0 flammability rating, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal | Connected to lower-potential node during Zener operation; enables reverse-bias configuration |
| Cathode (Pin 2) | Zener breakdown terminal | Connected to higher-potential node; carries regulated voltage reference or clamp point |
| No Connection (Pin 3) | Non-functional lead | Internally unconnected; electrically isolated and unused in circuit design |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures repeatable Zener voltage distribution and long-term stability under thermal cycling |
| AEC-Q101 qualification | Validates reliability for automotive electronics including engine control and body modules |
| Green molding compound (Date Code OW+) | Halogen- and antimony-free (<900 ppm Br/Cl, <1000 ppm Sb) - meets strict environmental compliance |
| 350 mW power rating at ambient | Enables direct replacement of legacy 300 mW Zeners without board redesign or thermal margin loss |
Applications
| Power Supply Monitoring | ADC Reference Stabilization |
|---|---|
|
Use Scenario: Monitoring 48 V DC bus in telecom power systems using resistor-divider + comparator. IC Role / Device Role / Timing Role: Zener provides stable 39 V reference for comparator threshold, rejecting supply ripple. Use Value: 130 Ω ZZT limits threshold shift to <15 mV under 100 µA divider current variation. |
Use Scenario: Biasing precision 12-bit SAR ADC input range in sensor signal conditioning. IC Role / Device Role / Timing Role: Acts as low-noise, low-capacitance (≤10 pF) voltage clamp on reference rail. Use Value: Sub-0.1 µA IR prevents loading of high-impedance op-amp buffer driving ADC REF pin. |
| Overvoltage Protection | Microcontroller Reset Circuit |
|
Use Scenario: Protecting 3.3 V I/O pins against ESD-induced transients on industrial fieldbus lines. IC Role / Device Role / Timing Role: Fast-clamping Zener shunts surge energy before it reaches downstream logic. Use Value: 350 mW rating sustains 100 ns 1 kV/100 Ω surge pulse without parametric shift or failure. |
Use Scenario: Generating clean reset signal for ARM Cortex-M0 MCU during brown-out conditions. IC Role / Device Role / Timing Role: Provides temperature-compensated 39 V threshold for external reset supervisor IC. Use Value: −3.5 mV/°C TC aligns with supervisor's internal reference drift, reducing system-level reset window error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5242B-7-F | 39 V nominal, 200 mW PD, 150 Ω ZZT, same SOT23 package | Limited to lower-power bias networks due to 200 mW rating; not AEC-Q101 qualified | Select when cost sensitivity outweighs automotive qualification and thermal margin needs |
| BZX84-C39,115 | 39 V nominal, 350 mW PD, 130 Ω ZZT, SOT23, but non-AEC-Q101, halogen-containing molding compound | Not suitable for automotive or green-compliance programs requiring halogen-free materials | Choose only for legacy industrial designs where RoHS3 and AEC-Q101 are not mandated |
Compared with MMBZ5242B-7-F and BZX84-C39,115, the BZX84C39-7-F delivers superior thermal headroom (350 mW vs. 200 mW), identical Zener impedance, and full AEC-Q101/halogen-free compliance - making it the preferred choice for next-generation automotive and eco-regulated designs.
Availability
BZX84C39-7-F is available at Aetrix Electronics and suitable for automotive powertrain monitoring, industrial sensor signal conditioning, telecom DC bus supervision, and microcontroller reset circuitry requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX84C39-7-F 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 semiconductor company specializing in discrete, analog, and mixed-signal solutions, with manufacturing and testing facilities across Asia and design centers in the US and Europe.
The BZX84 series belongs to Diodes' standard Zener diode product line, engineered for high-reliability voltage regulation in automotive, industrial, and consumer applications where precision, stability, and environmental compliance are mandatory.
FAQ
What is the maximum reverse voltage the BZX84C39-7-F can withstand before breakdown?
The BZX84C39-7-F has a nominal Zener voltage of 39 V at 2 mA test current, with a guaranteed breakdown range of 37.0 V to 41.0 V. It begins regulating in reverse breakdown within this band and is not rated for sustained operation above 41.0 V without exceeding its power or thermal limits.
Is the BZX84C39-7-F suitable for use in automotive applications?
Yes - the BZX84C39-7-F is explicitly qualified to AEC-Q101 standards and manufactured with green (halogen- and antimony-free) molding compound for Date Codes OW (2009 week 42) and newer, making it approved for under-hood and body electronics in passenger vehicles and commercial fleets.
How does the temperature coefficient affect circuit performance?
With a temperature coefficient of −3.5 mV/°C, the Zener voltage decreases by approximately 3.5 mV per degree Celsius rise. In a 39 V reference, this yields ~0.009% per °C drift - acceptable for most non-precision applications but requires compensation in high-accuracy voltage monitors or references.
What is the significance of the "-7-F" suffix in the part number?
The "-7-F" denotes standard-grade (non-automotive) packaging in 3,000-unit tape-and-reel format, with "F" indicating Diodes Incorporated's RoHS-compliant, lead-free plating. The "-7" identifies the reel size and orientation per Diodes' packaging standard, distinct from automotive "Q-7-F" variants.
BZX84C39-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 130 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 27.3 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
BZX84C39-7-F FAQ
1.How can I place an order for BZX84C39-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C39-7-F 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 BZX84C39-7-F reliable?
The price and inventory of BZX84C39-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C39-7-F is usually 5 days.
3.What payment methods are accepted for BZX84C39-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C39-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C39-7-F?
BZX84C39-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C39-7-F 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 BZX84C39-7-F?
For technical support, including BZX84C39-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C39-7-F requirements.
6.How does Aetrix verify that BZX84C39-7-F is sourced from the original manufacturer or authorized distributors?
All BZX84C39-7-F 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 BZX84C39-7-F meets industry standards.
7.What is the process for return or replacement of BZX84C39-7-F?
All BZX84C39-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C39-7-F, 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 BZX84C39-7-F part is unused and in its original packaging.
Return procedure for BZX84C39-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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