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Diodes Incorporated BZT52C39-7
- Part No.:
- BZT52C39-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
BZT52C39-7.pdf
- Description:
- DIODE ZENER 39V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:5,076
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Product details
Overview
BZT52C39-7 from Diodes Incorporated is a surface-mount 39 V Zener diode in SOD123 package, rated for 500 mW power dissipation at TL = +75°C and 370 mW at TA = +25°C, with 130 Ω maximum Zener impedance at 2 mA test current and ±5% voltage tolerance (37.0–41.0 V). It serves as a precision voltage reference or overvoltage clamp in low-power DC supply rails and signal conditioning circuits.
For engineers reviewing the BZT52C39-7 datasheet, BZT52C39-7 pinout, BZT52C39-7 application, or BZT52C39-7 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (RθJA = 338 °C/W), reverse leakage (≤0.1 µA at VR = 33.4 V), temperature coefficient (−2 mV/°C), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load or input conditions. Its planar die construction ensures consistent breakdown characteristics and low dynamic impedance (ZZT ≤ 130 Ω) at IZT = 2 mA, enabling accurate regulation in feedback networks and voltage-sensing paths.
The device features a cathode band polarity marker, matte tin-plated alloy 42 leadframe, and UL 94V-0 molded plastic case. With RθJL = 150 °C/W and operating range of −65 °C to +150 °C, it supports thermally constrained PCB layouts while meeting automotive reliability standards per AEC-Q101.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39 V nominal, 37.0–41.0 V range at IZT = 2 mA - defines clamping threshold for overvoltage protection |
| Power Dissipation (PD) | 370 mW at TA = +25°C - limits continuous current to ~9.5 mA at 39 V without heatsinking |
| Zener Impedance (ZZT) | ≤130 Ω at IZT = 2 mA - ensures minimal voltage shift under small-signal load variations |
| Reverse Leakage (IR) | ≤0.1 µA at VR = 33.4 V - guarantees negligible quiescent current in standby voltage-reference applications |
| Temperature Coefficient | −2 mV/°C - enables predictable drift compensation in temperature-sensitive analog circuits |
| Thermal Resistance (RθJA) | 338 °C/W - requires careful copper pad design to avoid junction overheating above ambient |
Pinout & Package
Package: SOD123 - surface-mount plastic case with cathode band marking; dimensions: D = 1.40–1.70 mm, E = 2.55–2.85 mm, He = 3.55–3.85 mm, weight ≈ 0.010 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side of regulated circuit; forms reference ground for shunt regulation |
| Cathode | Reverse breakdown terminal / Zener voltage output node | Connected to higher-potential rail; delivers stable 39 V when reverse-biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures repeatable Zener voltage distribution and low parametric spread across production lots |
| AEC-Q101 qualification | Validates suitability for automotive electronics including body control modules and sensor interfaces |
| Lead-free & RoHS-compliant | Meets EU Directive 2011/65/EU and halogen/antimony-free "Green" requirements (<900 ppm Br/Cl) |
| SOD123 package | Enables high-density PCB layout and compatibility with standard pick-and-place assembly processes |
Applications
| Automotive Sensor Reference | Industrial Power Supply Clamp |
|---|---|
Use Scenario: Stabilizing excitation voltage for analog pressure or temperature sensors in engine control units. IC Role / Device Role / Timing Role: Shunt voltage reference providing fixed 39 V bias to sensor bridge circuits. Use Value: Maintains sensor linearity and offset stability despite battery voltage fluctuations between 9–16 V. |
Use Scenario: Clamping transient overvoltages on 24 V industrial PLC I/O lines during inductive load switching. IC Role / Device Role / Timing Role: Transient voltage suppressor limiting peak rail voltage to ≤41 V. Use Value: Prevents damage to downstream op-amps and ADC inputs by absorbing <100 mJ surge energy within safe SOA limits. |
| Consumer Audio Biasing | Medical Instrument Calibration |
Use Scenario: Generating precise bias points for Class-AB audio amplifier stages in portable speakers. IC Role / Device Role / Timing Role: Low-noise Zener reference for dual-rail ±19.5 V supply derivation. Use Value: Reduces harmonic distortion by minimizing supply rail asymmetry caused by resistor-divider drift. |
Use Scenario: Providing traceable voltage reference in handheld blood glucose meter calibration circuits. IC Role / Device Role / Timing Role: Primary voltage standard for ADC full-scale adjustment during factory calibration. Use Value: Enables ±0.5% measurement accuracy over −20 °C to +60 °C via matched TC and tight VZ tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5242B-7-F | Same 39 V nominal rating but ±5% tolerance, 200 mW PD at TA = +25°C, SOT-23 package | Lower power handling and smaller footprint; unsuitable for >5 mA continuous clamp loads | Select when board space is critical and thermal budget permits derated operation |
| BZX84-C39 | 39 V Zener, ±5% tolerance, 300 mW PD, SOT-23 package, no AEC-Q101 qualification | Lacks automotive reliability validation; higher ZZT (≤150 Ω) and wider IR spec (≤1 µA at VR) | Acceptable for commercial-grade consumer products where cost and footprint outweigh qualification needs |
Compared with MMBZ5242B-7-F and BZX84-C39, BZT52C39-7 offers superior thermal performance (370 mW vs. 200/300 mW), AEC-Q101 compliance, and tighter IR specification-making it the preferred choice for automotive and industrial applications demanding long-term voltage stability under thermal stress.
Availability
BZT52C39-7 is available at Aetrix Electronics and suitable for automotive sensor reference, industrial power supply clamp, and medical instrument calibration requiring stable component supply, consistent Zener voltage matching, and AEC-Q101 reliability assurance.
Supply support for BZT52C39-7 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, specializing in high-reliability components for automotive, industrial, and computing markets.
The BZT52 series belongs to Diodes' general-purpose Zener diode product line, engineered for precision voltage regulation and transient suppression in space-constrained, thermally demanding applications.
FAQ
What is the maximum continuous reverse current the BZT52C39-7 can handle without exceeding its power rating?
At TA = +25°C, the BZT52C39-7 has a 370 mW power rating. With a nominal Zener voltage of 39 V, the maximum continuous reverse current is approximately 9.5 mA (370 mW ÷ 39 V). Derating is required above +25°C per the power derating curve (338 °C/W), reducing usable current linearly with ambient temperature rise.
Does the BZT52C39-7 have a specified capacitance value, and how does it affect high-frequency applications?
No specific capacitance value is provided in the datasheet for BZT52C39-7. However, Figure 5 shows typical total capacitance for 39 V Zeners is ~15 pF at VR = 1 V and f = 1 MHz. This low parasitic capacitance makes it suitable for DC and low-frequency (<100 kHz) regulation, but not for RF bypass or fast transient suppression where sub-picofarad devices are required.
How is the cathode identified on the SOD123 package of the BZT52C39-7?
The cathode is marked by a visible cathode band - a narrow, opaque stripe near one end of the SOD123 body. When viewed from the top with the band on the left, the left terminal is cathode and the right terminal is anode. This matches standard SOD123 polarity orientation used in PCB footprints and assembly drawings.
Is the BZT52C39-7 suitable for use in life support equipment?
No. Per Diodes Incorporated's Important Notice, BZT52C39-7 is explicitly not authorized for use in life support devices or systems without express written approval from Diodes' CEO. Its qualification covers AEC-Q101 automotive reliability, not the fault-tolerant redundancy or safety certification required for implantable or critical-care medical hardware.
BZT52C39-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 500 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:
- SOD-123
BZT52C39-7 FAQ
1.How can I place an order for BZT52C39-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52C39-7 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 BZT52C39-7 reliable?
The price and inventory of BZT52C39-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52C39-7 is usually 5 days.
3.What payment methods are accepted for BZT52C39-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52C39-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52C39-7?
BZT52C39-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52C39-7 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 BZT52C39-7?
For technical support, including BZT52C39-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52C39-7 requirements.
6.How does Aetrix verify that BZT52C39-7 is sourced from the original manufacturer or authorized distributors?
All BZT52C39-7 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 BZT52C39-7 meets industry standards.
7.What is the process for return or replacement of BZT52C39-7?
All BZT52C39-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZT52C39-7, 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 BZT52C39-7 part is unused and in its original packaging.
Return procedure for BZT52C39-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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