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Diodes Incorporated BZT52C3V9S-7
- Part No.:
- BZT52C3V9S-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZT52C3V9S-7.pdf
- Description:
- DIODE ZENER 3.9V 200MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:9,474
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Product details
Overview
BZT52C3V9S-7 from Diodes Incorporated is a surface-mount Zener diode with nominal 3.9 V zener voltage at 5 mA, 200 mW power dissipation, and SOD323 package. It provides precise voltage regulation in low-power biasing, reference, and overvoltage protection circuits for automotive and industrial control modules.
For engineers reviewing the BZT52C3V9S-7 datasheet, BZT52C3V9S-7 pinout, BZT52C3V9S-7 application, or BZT52C3V9S-7 equivalent, key selection criteria include zener voltage tolerance (±5.1%), low dynamic impedance (90 Ω at 5 mA), AEC-Q101 qualification, thermal resistance (625 °C/W), and cathode-band polarity marking.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying current loads. Its planar die construction ensures consistent breakdown characteristics and low leakage, with specified reverse current ≤3 µA at 1.0 V and temperature coefficient of –3.5 mV/°C.
The device is rated for operation from –65 °C to +150 °C and features a matte tin–plated alloy 42 leadframe for reliable solderability. Its SOD323 package supports automated assembly and meets UL 94V-0 flammability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.9 V nominal at IZT = 5 mA; range 3.7–4.1 V ensures tight regulation in precision references |
| Power Dissipation (PD) | 200 mW at TA = 25 °C; derates linearly above 25 °C per Fig. 1 |
| Zener Impedance (ZZT) | 90 Ω at 1 kHz, 5 mA; enables stable regulation under small-signal load variations |
| Reverse Current (IR) | ≤3 µA at VR = 1.0 V; guarantees minimal leakage in standby-biased circuits |
| Thermal Resistance (RθJA) | 625 °C/W on FR-4 board; defines maximum junction rise under given ambient and layout |
| Operating Temperature | –65 °C to +150 °C; supports under-hood automotive and industrial environments |
| Temperature Coefficient | –3.5 mV/°C; predicts predictable VZ drift with ambient changes |
Pinout & Package
Package: SOD323 - ultra-compact surface-mount plastic case (1.30 mm × 1.70 mm × 0.90 mm), cathode band marked, 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-bias regulation; forms reference ground return path |
| Cathode | Zener breakdown terminal / voltage clamp output | Connected to regulated rail; cathode band identifies this terminal for correct PCB orientation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control and body electronics |
| Lead-free & RoHS compliant | Fully compliant with EU Directive 2011/65/EU; no intentionally added lead or halogens |
| Low Zener impedance | 90 Ω at 5 mA enables minimal voltage deviation under load transients |
| SOD323 footprint | Enables high-density PCB layouts and compatibility with standard pick-and-place equipment |
| Cathode band polarity mark | Ensures unambiguous orientation during automated assembly and manual inspection |
Applications
| Automotive Sensor Biasing | Industrial Analog Reference |
|---|---|
Use Scenario: Providing stable 3.9 V bias to analog sensor front-ends in engine coolant temperature or pressure sensors. IC Role / Device Role / Timing Role: Zener voltage reference for op-amp input stage and ADC reference divider networks. Use Value: Tight 3.7–4.1 V tolerance and –3.5 mV/°C TC ensure <±1% reference stability across –40 °C to +125 °C operating range. | Use Scenario: Generating fixed reference voltage for 12-bit SAR ADCs in programmable logic controllers. IC Role / Device Role / Timing Role: Low-noise DC voltage clamp replacing higher-cost shunt references in cost-sensitive I/O modules. Use Value: 90 Ω dynamic impedance minimizes code shift under varying supply ripple, improving effective resolution by ≥0.5 LSB. |
| USB Port Overvoltage Clamp | Microcontroller Reset Circuit |
Use Scenario: Protecting 3.3 V USB data lines from ESD-induced transients exceeding 5 V. IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting line voltage to ≤4.1 V during surge events. Use Value: 3 µA max reverse leakage at 1.0 V prevents signal integrity degradation during normal operation. | Use Scenario: Holding microcontroller reset pin low until regulated 3.3 V rail stabilizes after power-up. IC Role / Device Role / Timing Role: Precision threshold detector in RC-based reset timing network. Use Value: 5 mA test current and ±5.1% VZ tolerance enable predictable 10–100 ms reset hold time across temperature and process variation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5227BS-7-F | Zener voltage 3.6 V (3.4–3.8 V), same SOD323 package and 200 mW rating | Lower clamping voltage; suitable where tighter margin below 3.3 V rail is required | Select when system tolerance allows 3.6 V reference and lower VZ improves noise margin |
| BZX384-C3V9,115 | Same 3.9 V nominal, but SOD323 variant with 300 mW rating and higher IZK (5 mA) | Higher power handling; better suited for transient suppression with longer pulse duration | Prefer for surge-prone interfaces where 200 mW may be insufficient for peak energy absorption |
Compared with BZT52C3V9S-7, MMBZ5227BS-7-F offers lower regulation voltage for tighter 3.3 V rail margins, while BZX384-C3V9,115 provides higher power capability for transient-heavy applications-neither is pin-compatible without layout revision.
Availability
BZT52C3V9S-7 is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC analog I/O, and USB interface protection requiring stable component supply and AEC-Q101 compliance.
Supply support for BZT52C3V9S-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The BZT52C series belongs to Diodes' high-reliability Zener diode product line, engineered specifically for voltage regulation, reference, and protection in automotive, industrial, and consumer systems where space, thermal performance, and qualification matter.
FAQ
What is the maximum reverse voltage before breakdown for BZT52C3V9S-7?
The nominal zener voltage is 3.9 V at 5 mA test current, with guaranteed range 3.7–4.1 V. Breakdown begins near the lower limit; full regulation occurs above 1.0 mA. The device is not rated for continuous forward conduction beyond 0.9 V at 10 mA.
Is BZT52C3V9S-7 suitable for use in high-humidity environments?
Yes - it carries J-STD-020 moisture sensitivity level 1, meaning it can be stored indefinitely at ≤30 °C/60% RH without baking prior to reflow. The molded plastic case and matte tin plating provide robust corrosion resistance in humid industrial enclosures.
Does this Zener diode require a series current-limiting resistor in all applications?
Yes - a series resistor is mandatory to limit zener current within the 200 mW power rating. For example, at 12 V supply and 3.9 V regulation, minimum R = (12 − 3.9) V / 5 mA = 1.62 kΩ to sustain 5 mA; actual value must account for worst-case VZ and supply variance.
How does the temperature coefficient affect long-term accuracy in a 0–70 °C operating range?
With –3.5 mV/°C TC and 3.9 V nominal, VZ shifts –0.245 V from 25 °C to 70 °C (ΔT = 45 °C), resulting in ~6.3% change. For stable references, use temperature-compensated designs or select tighter-tolerance variants like BZT52C3V9L for reduced TC impact.
BZT52C3V9S-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 3.9 V
- Tolerance:
- ±5%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 1 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-323
BZT52C3V9S-7 FAQ
1.How can I place an order for BZT52C3V9S-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52C3V9S-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 BZT52C3V9S-7 reliable?
The price and inventory of BZT52C3V9S-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52C3V9S-7 is usually 5 days.
3.What payment methods are accepted for BZT52C3V9S-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52C3V9S-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52C3V9S-7?
BZT52C3V9S-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52C3V9S-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 BZT52C3V9S-7?
For technical support, including BZT52C3V9S-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52C3V9S-7 requirements.
6.How does Aetrix verify that BZT52C3V9S-7 is sourced from the original manufacturer or authorized distributors?
All BZT52C3V9S-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 BZT52C3V9S-7 meets industry standards.
7.What is the process for return or replacement of BZT52C3V9S-7?
All BZT52C3V9S-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZT52C3V9S-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 BZT52C3V9S-7 part is unused and in its original packaging.
Return procedure for BZT52C3V9S-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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