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Vishay General Semiconductor - Diodes Division BZT52C39-E3-18
- Part No.:
- BZT52C39-E3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
BZT52C39-E3-18.pdf
- Description:
- DIODE ZENER 39V 410MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:5,698
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Product details
Overview
BZT52C39-E3-18 from Vishay Semiconductors is a silicon planar Zener diode in SOD-123 package, rated for 39 V nominal Zener voltage (±5% tolerance), 2 mA test current, and 500 mW maximum power dissipation on leaded FR-4 board. It delivers stable voltage reference and overvoltage protection in low-power analog and digital supply rail conditioning circuits.
For engineers reviewing the BZT52C39-E3-18 datasheet, BZT52C39-E3-18 pinout, BZT52C39-E3-18 application, or BZT52C39-E3-18 equivalent, this page provides verified electrical specs, thermal behavior, SOD-123 terminal mapping, AEC-Q101 qualification status, and validated alternative parts for industrial power management and signal-level clamping designs.
Technical Context
This device operates as a single-element, unidirectional Zener diode with cathode-marked polarity. Its Zener voltage is specified at 39 V (min 37.05 V, max 40.95 V) under 2 mA DC test current, with dynamic resistance of ≤87 Ω and temperature coefficient of +8 to +12 × 10⁻⁴/°C.
It features ESD robustness per AEC-Q101 (HBM > 8 kV, MM > 800 V), RoHS-compliant construction, and MSL level 1 moisture sensitivity. Thermal resistance junction-to-ambient is 420 K/W on FR-4 with recommended footprint, limiting continuous Zener current to 9 mA at 45 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39 V nominal, ±5% tolerance (37.05–40.95 V); defines precise clamping threshold for 3.3 V–48 V system rails. |
| Test Current (IZT) | 2 mA; standard bias point for guaranteed VZ specification and dynamic resistance measurement. |
| Power Dissipation (Ptot) | 500 mW (lead-mounted), 300 mW (FR-4 board); sets absolute thermal limit for continuous operation. |
| Dynamic Resistance (ZZ) | ≤87 Ω at IZT = 2 mA; determines voltage regulation stiffness under load transients. |
| Temperature Coefficient (αVZ) | +8 to +12 × 10⁻⁴/°C; indicates positive drift with temperature-critical for high-accuracy references above 30 V. |
| Reverse Leakage (IR) | ≤100 nA at VR = 29 V; ensures minimal quiescent current in standby or battery-powered circuits. |
| Operating Temperature | -55 to +150 °C; supports extended-range industrial, automotive, and outdoor electronics deployment. |
Pinout & Package
SOD-123 surface-mount package: 2.7 mm × 1.55 mm body, 0.85 mm height, cathode marked by bar on top surface. Lead-free, RoHS-compliant molding compound (UL 94 V-0).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward bias; connected to lower-potential node in Zener mode. | Must be held at potential ≤ (VZ − 0.7 V) to avoid forward conduction; ties to ground or return path in shunt regulator topology. |
| Cathode | Current exit terminal during reverse breakdown; marked by bar on package top. | Connected to regulated voltage node; absorbs transient energy and sinks Zener current into anode path. |
Key Features
| Feature | Design Value |
|---|---|
| Silicon planar Zener structure | Enables tight VZ tolerance (±5%), low noise, and repeatable breakdown characteristics across production lots. |
| E24-standard voltage grading | Ensures compatibility with common design libraries and simplifies BOM consolidation across 2.2–75 V reference points. |
| AEC-Q101 non-qualified (E3 suffix) | Indicates commercial-grade reliability; suitable for non-automotive applications where qualification is not mandated. |
| MSL Level 1 handling | Permits unlimited floor life and reflow without baking-reduces manufacturing overhead for high-mix assembly. |
| 8 mm tape on 13" reel (10 000 units) | Optimized for high-volume SMT placement; matches standard feeder configurations in Juki, Fuji, and Yamaha lines. |
Applications
| Power Supply Rail Clamping | Microcontroller I/O Protection |
|---|---|
Use Scenario: Clamp 3.3 V or 5 V logic supply against ESD or inductive kickback in industrial PLC modules. IC Role / Device Role / Timing Role: Shunt Zener element absorbing transient energy before it reaches downstream regulators or MCU pins. Use Value: Limits voltage excursion to ≤40.95 V, preventing latch-up or gate oxide damage in 3.3 V/5 V systems. |
Use Scenario: Protect GPIO pins of ARM Cortex-M microcontrollers from external surge events in sensor nodes. IC Role / Device Role / Timing Role: Low-capacitance voltage clamp placed directly at connector interface. Use Value: With ≤100 nA leakage at 29 V, it introduces negligible loading while providing 39 V standoff capability. |
| Reference Voltage Source | Overvoltage Detection Threshold |
Use Scenario: Generate stable 39 V reference for ADC input scaling in battery monitoring circuits. IC Role / Device Role / Timing Role: Precision Zener used in ratiometric divider network feeding SAR ADC reference input. Use Value: ±5% tolerance and +8 to +12 × 10⁻⁴/°C TC enable <1% total error over -40 to +85 °C without calibration. |
Use Scenario: Trigger crowbar circuit when 48 V telecom supply exceeds safe operating window. IC Role / Device Role / Timing Role: Zener-based comparator input threshold set to 39 V ±5% to initiate shutdown at 41 V. Use Value: Fast response (<100 ns) and low dynamic resistance ensure reliable trip point with minimal hysteresis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5242BS-7-F (Diodes Inc.) | Same 39 V nominal, ±5%, SOD-323 package; 200 mW Ptot, higher ZZ (150 Ω), lower IZT (0.2 mA). | Lower power rating limits use to signal-level clamping only-not suitable for >5 mA regulation loads. | Select when board space is constrained and power dissipation remains <150 mW. |
| BZX84-C39 (Nexperia) | Same 39 V, ±5%, SOT-23 package; 300 mW Ptot, ZZ ≤ 90 Ω, Tj = 150 °C, AEC-Q101 qualified (BZX84-C39,115). | Includes AEC-Q101 option; SOT-23 offers slightly larger pad area but same thermal performance on FR-4. | Choose for automotive-qualified designs requiring drop-in replacement with identical electrical behavior. |
Compared with BZT52C39-E3-18, MMBZ5242BS-7-F trades power handling for smaller footprint, while BZX84-C39 offers automotive qualification and comparable regulation performance in a different package-neither is pin-compatible, but both serve overlapping voltage-reference and clamping roles with verified parameter alignment.
Availability
BZT52C39-E3-18 is available at Aetrix Electronics and suitable for industrial power supply clamping, microcontroller I/O protection, precision reference generation, and overvoltage detection circuits requiring stable component supply and long-term obsolescence management.
Supply support for BZT52C39-E3-18 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
Vishay Intertechnology is a global semiconductor manufacturer specializing in discrete components, sensors, and passive elements, with emphasis on reliability, power efficiency, and automotive-grade qualification.
The BZT52 series targets cost-sensitive, high-volume applications requiring stable Zener references across consumer, industrial, and communications equipment-designed for manufacturability, thermal robustness, and consistent parametric yield.
FAQ
What is the Zener voltage tolerance and test condition for BZT52C39-E3-18?
The BZT52C39-E3-18 has a nominal Zener voltage of 39 V with ±5% tolerance (37.05 V to 40.95 V), measured at a test current of 2 mA under pulsed conditions (tp = 5 ms). This tolerance band is guaranteed per the Vishay BZT52 datasheet Rev. 1.1 and applies to all units shipped under the E3-18 ordering code.
Is BZT52C39-E3-18 AEC-Q101 qualified?
No, BZT52C39-E3-18 is not AEC-Q101 qualified. The "E3" suffix denotes RoHS-compliant commercial-grade construction. For AEC-Q101 qualification, the part must carry the "HE3_A" suffix (e.g., BZT52C39-HE3_A-18), which is a separate orderable variant with identical electrical specs but additional stress testing and traceability.
What is the maximum continuous Zener current for BZT52C39-E3-18 at 70 °C ambient?
At 70 °C ambient temperature, the maximum admissible Zener current for BZT52C39-E3-18 is approximately 6.5 mA when mounted on an FR-4 board with the recommended soldering footprint. This derives from the derated power dissipation curve (Fig. 1, datasheet p.4) and the 300 mW board-rated Ptot.
Does BZT52C39-E3-18 have a defined cathode marking, and how is it oriented on the SOD-123 package?
Yes, BZT52C39-E3-18 uses a cathode bar marking on the top surface of the SOD-123 package. As shown in the Vishay package drawing (p.5), the bar aligns with the cathode terminal-this orientation is confirmed in carrier tape diagrams (p.6) and must be respected during pick-and-place to ensure correct polarity in circuit operation.
What is the thermal resistance junction-to-ambient (RthJA) for BZT52C39-E3-18 on FR-4 board?
The thermal resistance junction-to-ambient (RthJA) for BZT52C39-E3-18 is 420 K/W when mounted on an FR-4 printed circuit board using Vishay's recommended soldering footprint per JEDEC 51-3. This value is critical for calculating junction temperature rise under steady-state Zener current and must be applied with actual board copper area and airflow conditions.
BZT52C39-E3-18 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- BZT52
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 410 mW
- Impedance (Max) (Zzt):
- 87 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 29 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
BZT52C39-E3-18 FAQ
1.How can I place an order for BZT52C39-E3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52C39-E3-18 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-E3-18 reliable?
The price and inventory of BZT52C39-E3-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52C39-E3-18 is usually 5 days.
3.What payment methods are accepted for BZT52C39-E3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52C39-E3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52C39-E3-18?
BZT52C39-E3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52C39-E3-18 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-E3-18?
For technical support, including BZT52C39-E3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52C39-E3-18 requirements.
6.How does Aetrix verify that BZT52C39-E3-18 is sourced from the original manufacturer or authorized distributors?
All BZT52C39-E3-18 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-E3-18 meets industry standards.
7.What is the process for return or replacement of BZT52C39-E3-18?
All BZT52C39-E3-18 units undergo pre-shipment inspection (PSI). If there is an issue with BZT52C39-E3-18, 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-E3-18 part is unused and in its original packaging.
Return procedure for BZT52C39-E3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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