My Inquiry
My Account
Diodes Incorporated BZX84B39-7-F
- Part No.:
- BZX84B39-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84B39-7-F.pdf
- Description:
- DIODE ZENER 39V 350MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX84B39-7-F from Diodes Incorporated is a precision 39 V ±2% tolerance Zener 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 0.1 µA maximum reverse leakage at 27.3 V, used for voltage regulation and reference in low-power analog circuits.
For engineers reviewing the BZX84B39-7-F datasheet, BZX84B39-7-F pinout, BZX84B39-7-F application, or BZX84B39-7-F equivalent, key selection criteria include Zener voltage tolerance (±2%), thermal resistance (357 °C/W), junction-to-ambient derating behavior, and AEC-Q101 qualification status for automotive-grade reliability.
Technical Context
This device operates as a two-terminal voltage reference, maintaining stable 39 V regulation across a 0.5–2 mA Zener test current range, with a positive temperature coefficient of +33.4 mV/°C above 30 V nominal rating. Its low 0.1 µA reverse current at VR = 27.3 V enables high-impedance biasing in sensing and feedback networks.
The SOT23 package supports automated placement and reflow, with UL 94V-0 molding compound and matte tin-plated Alloy 42 leads. Thermal performance is specified under two conditions: 350 mW at terminal-isothermal condition (Note 6) and 300 mW on FR-4 PCB with recommended pad layout (Note 5).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39 V nominal, 38.2–39.8 V range at 2 mA - defines precise regulation threshold for reference and clamp functions |
| Power Dissipation (PD) | 350 mW at isothermal terminals - sets maximum continuous power handling without forced cooling |
| Zener Impedance (ZZT) | 130 Ω max at 2 mA - determines output voltage stability under varying load current |
| Reverse Leakage (IR) | 0.1 µA max at 27.3 V - ensures minimal error current in high-impedance reference paths |
| Temp Coefficient (TC) | +33.4 mV/°C - quantifies voltage drift per degree Celsius above 25 °C ambient |
| Thermal Resistance (RθJA) | 357 °C/W - relates junction temperature rise to ambient under ideal terminal cooling |
| Package | SOT23 - surface-mount footprint compatible with standard pick-and-place and reflow processes |
Pinout & Package
Package: SOT23 - three-terminal plastic surface-mount case with cathode-marked lead (pin 1), anode (pin 2), and cathode (pin 3); dimensions per Diodes Inc. outline: 2.90 mm length × 1.30 mm width × 1.03 mm height; weight ≈ 0.008 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Cathode Mark) | Cathode | Connected to regulated voltage node; polarity indicator for correct orientation during placement |
| Pin 2 | Anode | Reference ground or return path; must be held at lower potential than cathode for conduction |
| Pin 3 | Cathode | Primary output terminal carrying regulated Zener voltage; electrically tied to Pin 1 in SOT23 configuration |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables tight regulation without post-manufacturing trimming in precision reference designs |
| AEC-Q101 qualified | Validated for automotive applications requiring extended temperature operation and reliability testing |
| Lead-free, halogen-free, antimony-free | Meets RoHS 3 (2015/863/EU) and green manufacturing requirements for global compliance |
| Moisture Sensitivity Level 1 | Eliminates bake preconditioning before reflow, reducing assembly cost and process complexity |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 39 V reference for adjustable DC-DC converter feedback networks in industrial power modules. IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference establishing precise feedback threshold for error amplifier input. Use Value: ±2% VZ tolerance ensures output voltage accuracy within ±0.8% over line/load/temperature, minimizing calibration overhead. |
Use Scenario: Protecting microcontroller I/O pins from transient surges in 24 V automotive sensor interfaces. IC Role / Device Role / Timing Role: Passive clamping element diverting excess energy to ground when voltage exceeds 39 V breakdown. Use Value: 350 mW power rating sustains 100 ms transients up to 1.5 A peak, meeting ISO 7637-2 Pulse 1/2a immunity requirements. |
| Temperature-Compensated Sensor Bias | Low-Power Analog Front-End Reference |
Use Scenario: Biasing RTD or thermistor bridges in battery-powered environmental monitors where drift must be minimized. IC Role / Device Role / Timing Role: Stable voltage source for excitation current generation, leveraging known +33.4 mV/°C TC for compensation algorithms. Use Value: Predictable TC allows software-based correction of reference drift, eliminating need for external compensation components. |
Use Scenario: Setting reference voltage for 12-bit ADCs in portable medical devices operating from single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Low-leakage (0.1 µA) shunt reference enabling high-input-impedance divider networks without loading error. Use Value: Sub-µA IR prevents >0.01% gain error in 1 MΩ divider arms, preserving full-scale resolution across battery discharge cycle. |
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, ±5% tolerance, 500 mW rating, SOD-123 package | Higher power but looser tolerance; larger footprint limits high-density layouts | Select when higher surge energy handling is required and board space permits larger package |
| BZX84-C39 | 39 V nominal, ±5% tolerance, same SOT23 package, non-AEC-Q101 rated | Lacks automotive qualification; lower cost but unsuitable for automotive Tier-1 designs | Select for cost-sensitive consumer electronics where AEC-Q101 is not mandated |
Compared with MMSZ4702T1G and BZX84-C39, BZX84B39-7-F delivers tighter ±2% regulation and AEC-Q101 validation-critical for automotive voltage references-while maintaining identical SOT23 footprint and assembly compatibility.
Availability
BZX84B39-7-F is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, and portable medical device power management requiring stable component supply and long-term lifecycle assurance.
Supply support for BZX84B39-7-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The BZX84 series belongs to Diodes' precision Zener diode product line, engineered for high-stability voltage reference and protection in automotive, industrial, and portable electronics where tight tolerance and reliability are essential.
FAQ
What is the maximum Zener test current for BZX84B39-7-F?
The device is characterized at 2 mA Zener test current (IZT), with maximum Zener impedance (ZZT) of 130 Ω measured under this condition. Operation beyond 2 mA is permissible within the 350 mW power limit, but voltage regulation accuracy degrades due to dynamic impedance effects and self-heating.
Is BZX84B39-7-F suitable for use in automotive applications?
Yes-BZX84B39-7-F is explicitly qualified to AEC-Q101 standards, including temperature cycling, humidity bias HAST, and mechanical shock testing. Its ±2% tolerance, +33.4 mV/°C TC, and SOT23 packaging meet requirements for engine control units, ADAS sensors, and infotainment power rails.
How does the thermal resistance change between PCB-mounted and isothermal conditions?
RθJA is 357 °C/W under isothermal terminal cooling (Note 6), but drops to 417 °C/W when mounted on FR-4 PCB with recommended pad layout (Note 5). This 17% increase reflects reduced heat transfer efficiency in typical board-level mounting, requiring derating above 25 °C ambient.
What marking code identifies BZX84B39-7-F on the SOT23 package?
The top-side marking is "KYE", followed by a two-character date code (e.g., "F9" for September 2018). "KYE" uniquely identifies the 39 V variant within the BZX84B series and is verified in the Electrical Characteristics Table of DS36159 Rev. 3.
BZX84B39-7-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:
- ±2%
- Power - Max:
- 350 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
BZX84B39-7-F FAQ
1.How can I place an order for BZX84B39-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84B39-7-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 BZX84B39-7-F reliable?
The price and inventory of BZX84B39-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84B39-7-F is usually 5 days.
3.What payment methods are accepted for BZX84B39-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84B39-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84B39-7-F?
BZX84B39-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84B39-7-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 BZX84B39-7-F?
For technical support, including BZX84B39-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84B39-7-F requirements.
6.How does Aetrix verify that BZX84B39-7-F is sourced from the original manufacturer or authorized distributors?
All BZX84B39-7-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 BZX84B39-7-F meets industry standards.
7.What is the process for return or replacement of BZX84B39-7-F?
All BZX84B39-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84B39-7-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 BZX84B39-7-F part is unused and in its original packaging.
Return procedure for BZX84B39-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84B39-7-F Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
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…
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…
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…
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…
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…
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.
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.…
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…
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…
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…
