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Diodes Incorporated BZT52C39Q-7-F
- Part No.:
- BZT52C39Q-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
BZT52C39Q-7-F.pdf
- Description:
- DIODE ZENER 39V 370MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:2,700
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Product details
Overview
BZT52C39Q-7-F from Diodes Incorporated is an automotive-grade surface-mount Zener diode with a nominal zener voltage of 39 V, 500 mW power dissipation at TL = +75°C, and 370 mW at TA = +25°C, designed for precision voltage regulation and overvoltage protection in automotive power supply rails and sensor interface circuits.
For engineers reviewing the BZT52C39Q-7-F datasheet, BZT52C39Q-7-F pinout, BZT52C39Q-7-F application, or BZT52C39Q-7-F equivalent, key selection criteria include zener voltage tolerance (±5.1%), dynamic impedance (130 Ω @ 2 mA), reverse leakage (0.1 µA @ 33.4 V), temperature coefficient (+27.3 mV/°C), and AEC-Q101 qualification for automotive reliability.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its planar die construction ensures consistent breakdown characteristics and low leakage, while the SOD123 package supports high thermal resistance management (RθJA = 338 °C/W) on FR-4 PCBs.
The device exhibits a positive temperature coefficient of +27.3 mV/°C, indicating increasing zener voltage with rising junction temperature - critical for biasing stability in automotive ambient ranges (–65°C to +150°C). It is rated for 2 mA test current and delivers <0.1 µA reverse current at 33.4 V, enabling low-power sensing and clamping applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39 V nominal, 37.0–41.0 V range @ IZT = 2 mA - defines regulated output voltage window under standard test conditions |
| Power Dissipation (PD) | 370 mW @ TA = +25°C - maximum continuous power before thermal derating begins |
| Zener Impedance (ZZT) | 130 Ω @ f = 1 kHz, IZT = 2 mA - indicates voltage regulation stiffness under small-signal AC variation |
| Reverse Leakage (IR) | 0.1 µA @ VR = 33.4 V - ensures minimal quiescent current draw in standby or high-impedance bias networks |
| Temperature Coefficient | +27.3 mV/°C - quantifies zener voltage drift per degree Celsius, essential for temperature-compensated references |
| Package | SOD123 - surface-mount plastic case with cathode band polarity marking and 0.010 g mass, optimized for automated placement |
Pinout & Package
Package: SOD123 - molded plastic case, UL 94V-0 flammability rating, matte tin-plated alloy 42 leadframe, cathode band marking, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower potential side in reverse-biased regulation; forms reference ground return path |
| Cathode | Zener breakdown terminal / voltage clamp input | Connected to higher potential rail; clamps voltage to 39 V when reverse-biased beyond breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics requiring high-reliability stress testing |
| Green, halogen-free construction | Contains <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - meets automotive environmental compliance mandates |
| Planar die technology | Delivers tight zener voltage tolerance and repeatable dynamic impedance across production lots |
| Automated assembly compatible | SOD123 footprint and matte tin finish ensure reliable solder wetting and pick-and-place yield |
Applications
| Automotive Power Rail Clamp | Industrial Sensor Reference |
|---|---|
Use Scenario: Clamping transient spikes on 36 V battery-fed ECUs during load dump events. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to limit voltage excursion to ≤41 V. Use Value: Prevents damage to downstream 40 V-rated CAN transceivers and microcontrollers without adding active circuitry. |
Use Scenario: Providing stable 39 V reference for analog front-end calibration in pressure sensors. IC Role / Device Role / Timing Role: Passive voltage reference source with low tempco and sub-µA leakage. Use Value: Enables ±0.5% full-scale accuracy over –40°C to +125°C without trimming or compensation. |
| LED Driver Overvoltage Protection | Programmable Logic Supply Monitor |
Use Scenario: Protecting constant-current LED drivers from bus overvoltage in commercial lighting systems. IC Role / Device Role / Timing Role: Shunt regulator that activates above 41 V to divert excess current. Use Value: Extends driver IC lifetime by limiting peak stress on internal MOSFETs and gate oxide. |
Use Scenario: Monitoring 36 V auxiliary supply in FPGA-based industrial controllers. IC Role / Device Role / Timing Role: Threshold detector feeding comparator input to trigger brownout reset. Use Value: Provides deterministic 39 V trip point with <0.1 µA bias current, minimizing monitoring circuit power overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5267B-TP (Micro Commercial) | Zener voltage 39 V (±5%), PD = 350 mW @ TA, RθJA = 357 °C/W, no AEC-Q101 qualification | Commercial-grade only; unsuitable for automotive under-hood use | Select when cost-sensitive non-automotive designs require identical voltage but relaxed reliability requirements |
| BZX84-C39 (Nexperia) | Zener voltage 39 V (±5%), PD = 300 mW @ TA, SOT23 package, AEC-Q101 qualified | Lower power rating and different footprint - requires PCB redesign and thermal reassessment | Choose only if SOT23 layout already exists and 300 mW derating margin suffices for target ambient conditions |
Compared with MMSZ5267B-TP and BZX84-C39, BZT52C39Q-7-F uniquely balances AEC-Q101 compliance, 370 mW power handling in compact SOD123, and +27.3 mV/°C tempco - making it optimal for space-constrained automotive voltage clamping where thermal and reliability margins are non-negotiable.
Availability
BZT52C39Q-7-F is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor reference design, and LED driver overvoltage suppression requiring stable component supply across extended temperature and lifecycle demands.
Supply support for BZT52C39Q-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 consumer markets since 1966.
The BZT52C series belongs to Diodes' automotive-qualified Zener portfolio, engineered specifically for robust voltage regulation in harsh environments - emphasizing AEC-Q101 stress resilience, tight parametric distribution, and green material compliance.
FAQ
What is the maximum reverse voltage this Zener can withstand before breakdown?
The BZT52C39Q-7-F has a nominal zener voltage of 39 V with a guaranteed range of 37.0 V to 41.0 V at 2 mA test current. Breakdown occurs within this band; operation below 37.0 V maintains <0.1 µA leakage, while sustained voltage >41.0 V risks exceeding power limits and thermal runaway.
Is this part suitable for use in a 12 V automotive system?
Yes - it is commonly used for overvoltage protection in 12 V systems during load dump transients (which can exceed 35 V), and also serves as a reference in 24 V and 36 V subsystems. Its AEC-Q101 qualification confirms suitability for automotive ambient and reliability requirements.
How does the SOD123 package affect thermal performance?
The SOD123 package delivers RθJA = 338 °C/W on FR-4 with 1-inch copper pad, meaning a 370 mW dissipation raises junction temperature ~125°C above ambient. For continuous operation near max power, board-level copper spreading or thermal vias are recommended to avoid exceeding +150°C TJ.
Does the "Q" suffix indicate anything beyond automotive qualification?
Yes - the "Q" denotes AEC-Q101 qualification and green (halogen/antimony-free) construction per Diodes' specification. It also signifies tighter process controls, extended temperature screening (–65°C to +150°C), and traceable lot documentation required for automotive PPAP submissions.
BZT52C39Q-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±5.13%
- Power - Max:
- 370 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:
- SOD-123
BZT52C39Q-7-F FAQ
1.How can I place an order for BZT52C39Q-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52C39Q-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 BZT52C39Q-7-F reliable?
The price and inventory of BZT52C39Q-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 BZT52C39Q-7-F is usually 5 days.
3.What payment methods are accepted for BZT52C39Q-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52C39Q-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52C39Q-7-F?
BZT52C39Q-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52C39Q-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 BZT52C39Q-7-F?
For technical support, including BZT52C39Q-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52C39Q-7-F requirements.
6.How does Aetrix verify that BZT52C39Q-7-F is sourced from the original manufacturer or authorized distributors?
All BZT52C39Q-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 BZT52C39Q-7-F meets industry standards.
7.What is the process for return or replacement of BZT52C39Q-7-F?
All BZT52C39Q-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BZT52C39Q-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 BZT52C39Q-7-F part is unused and in its original packaging.
Return procedure for BZT52C39Q-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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