Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Diodes Incorporated BZX84C39Q-7-F

Name: BZX84C39Q-7-F
Brand: Diodes Incorporated
SKU: BZX84C39Q-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: BZX84C39Q-7-F

Manufacturer:: Diodes Incorporated

Category:: Single Zener Diodes

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: BZX84C39Q-7-F.pdf

Description:: DIODE ZENER 39V 300MW SOT23

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:6,101

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

BZX84C39Q-7-F from Diodes Incorporated is an automotive-grade 39 V, 2 mA Zener diode in SOT23 package with 350 mW power dissipation, ±5% voltage tolerance (37.0–41.0 V), and 130 Ω dynamic impedance at test current, used for precision voltage regulation and overvoltage protection in automotive power rails and sensor interfaces.

For engineers reviewing the BZX84C39Q-7-F datasheet, BZX84C39Q-7-F pinout, BZX84C39Q-7-F application, or BZX84C39Q-7-F equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (357 °C/W), AEC-Q101 qualification, reverse leakage (<0.1 µA at 33.4 V), and SOT23 footprint compatibility with automated assembly.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. It features planar die construction for consistent parametric performance and low leakage, with a nominal temperature coefficient of −3.5 mV/°C near 39 V.

The device is rated for continuous operation from −65 °C to +150 °C and exhibits 350 mW power dissipation when leads are held at ambient temperature. Its 130 Ω Zener impedance at 2 mA ensures predictable regulation behavior in feedback loops and clamp circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	39 V nominal, 37.0–41.0 V range at 2 mA - defines clamping threshold for overvoltage protection
Power Dissipation (P_D)	350 mW - maximum continuous power at ambient-temperature terminals, enabling compact PCB layout
Zener Impedance (Z_ZT)	130 Ω at 2 mA - determines regulation stiffness and output voltage deviation under load change
Reverse Leakage (I_R)	<0.1 µA at 33.4 V - ensures minimal standby current in high-impedance bias networks
Thermal Resistance (R_θJA)	357 °C/W - quantifies junction-to-ambient heat rise per watt, critical for derating above 25 °C
Temperature Coefficient	−3.5 mV/°C - predicts voltage drift with ambient temperature, supporting stable reference design
AEC-Q101 Qualified	Yes - validated for automotive electronics per stress-test requirements including HTOL, TCT, and ESD

Pinout & Package

Package: SOT23 - surface-mount, 3-terminal plastic case with UL 94V-0 flammability rating, 0.008 g mass, and matte tin-plated Alloy 42 leadframe.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Pin 1)	Forward conduction terminal / cathode reference ground	Connected to system ground or lower-potential node in shunt regulator configuration
Cathode (Pin 2)	Zener breakdown terminal / voltage reference output	Connected to regulated rail or input node requiring clamping; carries full Zener current
No-Connect (Pin 3)	Internal die attachment pad	Electrically isolated; serves mechanical support only-must not be connected in circuit

Key Features

Feature	Design Value
Automotive qualification	AEC-Q101 compliant - enables use in engine control units, body electronics, and ADAS power domains
Green molding compound	Halogen- and antimony-free (<900 ppm Br/Cl, <1000 ppm Sb) - meets automotive environmental compliance mandates
Planar die construction	Enables tight Zener voltage distribution and repeatable impedance across production lots
SOT23 tape-and-reel packaging	3,000 units per reel - optimized for high-speed pick-and-place assembly without manual handling
Low moisture sensitivity	JEDEC Level 1 - no baking required prior to reflow, reducing manufacturing overhead

Applications

Automotive Power Rail Clamp

Industrial Sensor Reference

Use Scenario: Clamping transient spikes on 36 V battery-supplied ECUs during load dump events.

IC Role / Device Role / Timing Role: Shunt Zener regulator providing passive overvoltage protection upstream of LDOs and microcontrollers.

Use Value: Maintains rail integrity below 41 V with <0.1 µA leakage, minimizing quiescent current in always-on modules.

Use Scenario: Providing stable 39 V reference for analog front-end gain calibration in industrial pressure transducers.

IC Role / Device Role / Timing Role: Precision voltage reference source for ADC biasing and ratiometric scaling circuits.

Use Value: Delivers ±5% voltage tolerance and −3.5 mV/°C TC, enabling <±0.5% full-scale error over −40 to +125 °C.

Telecom Line Interface Protection

Medical Diagnostic Equipment Bias

Use Scenario: Protecting RS-485 receiver inputs against induced surges in outdoor base station backhaul links.

IC Role / Device Role / Timing Role: Bidirectional transient suppressor (with series TVS) limiting common-mode voltage excursions.

Use Value: 130 Ω Zener impedance ensures fast response to sub-100 ns transients while maintaining signal integrity.

Use Scenario: Biasing photodiode amplifier stages in portable ultrasound imaging front-ends.

IC Role / Device Role / Timing Role: Low-noise voltage reference for op-amp offset nulling and gain-setting networks.

Use Value: Ultra-low leakage (<0.1 µA) prevents input bias current errors in femtoamp-level current measurement paths.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener diode applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMSZ4702T1G	39 V nominal, 500 mW P_D, 100 Ω Z_ZT, SOD-123 package	Larger footprint; higher power but less suitable for dense automotive layouts	Select when higher surge energy handling is required and board space permits larger package
BZX84-C39-7-F	Identical electrical specs, non-automotive grade, same SOT23 package	Not AEC-Q101 qualified; unsuitable for automotive safety-critical systems	Select for cost-sensitive industrial or consumer designs where automotive qualification is unnecessary

Compared with MMSZ4702T1G and BZX84-C39-7-F, BZX84C39Q-7-F uniquely combines AEC-Q101 qualification, SOT23 footprint, and guaranteed low-leakage performance - making it the only option qualified for under-hood automotive voltage reference and clamp functions.

Availability

BZX84C39Q-7-F is available at Aetrix Electronics and suitable for automotive power management, industrial sensor conditioning, telecom interface protection, and medical diagnostic biasing requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for BZX84C39Q-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for automotive, industrial, and computing markets.

The BZX84 series belongs to Diodes' automotive-qualified Zener diode product line, engineered specifically for voltage regulation, reference, and transient suppression in harsh-environment electronic control units.

FAQ

What is the maximum reverse voltage before breakdown for BZX84C39Q-7-F?

The BZX84C39Q-7-F has a nominal Zener voltage of 39 V with a guaranteed range of 37.0–41.0 V at 2 mA test current. Breakdown begins within this band; operation below 33.4 V (the rated VR) ensures <0.1 µA reverse leakage, preserving low-power integrity in standby modes.

Is BZX84C39Q-7-F compatible with lead-free reflow profiles?

Yes - the device uses matte tin finish over Alloy 42 leadframe and is fully RoHS 3 compliant (2015/863/EU). It meets JEDEC J-STD-020 moisture sensitivity Level 1 and is rated for standard Pb-free reflow up to 260 °C peak, with no pre-bake required.

How does the temperature coefficient affect regulation accuracy over temperature?

With a specified temperature coefficient of −3.5 mV/°C, the Zener voltage decreases by approximately 0.42 V across a 120 °C range (−40 to +80 °C). This drift is linear and predictable, allowing compensation in precision reference designs using matched NTC networks or digital calibration.

Can BZX84C39Q-7-F replace BZX84C39-7-F in existing designs?

Yes - electrically identical except for AEC-Q101 qualification and green compound compliance. The Q-suffix variant adds automotive reliability testing and halogen-free materials but maintains identical pinout, marking, and thermal characteristics, enabling drop-in replacement where automotive qualification is mandated.

BZX84C39Q-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:: ±5.13%

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 (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

BZX84C39Q-7-F FAQ

1.How can I place an order for BZX84C39Q-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84C39Q-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 BZX84C39Q-7-F reliable?

The price and inventory of BZX84C39Q-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 BZX84C39Q-7-F is usually 5 days.

3.What payment methods are accepted for BZX84C39Q-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C39Q-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84C39Q-7-F?

BZX84C39Q-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84C39Q-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 BZX84C39Q-7-F?

For technical support, including BZX84C39Q-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C39Q-7-F requirements.

6.How does Aetrix verify that BZX84C39Q-7-F is sourced from the original manufacturer or authorized distributors?

All BZX84C39Q-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 BZX84C39Q-7-F meets industry standards.

7.What is the process for return or replacement of BZX84C39Q-7-F?

All BZX84C39Q-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C39Q-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 BZX84C39Q-7-F part is unused and in its original packaging.

Return procedure for BZX84C39Q-7-F:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…

2026-08-11 LDO Regulator: Dropout Voltage, Noise, PSRR and Power Dissipation

LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…

2026-08-06 Conditional Access Module: CAM, CI/CI+ and DVB Security

Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…

2026-08-03 Electronic Component Obsolescence: EOL Risks, Replacement Options and Last-Time Buy Strategy

Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…