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Diodes Incorporated BZT52C20-7-F
- Part No.:
- BZT52C20-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
BZT52C20-7-F.pdf
- Description:
- DIODE ZENER 20V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:52,179
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Product details
Overview
BZT52C20-7-F from Diodes Incorporated is a surface-mount 20 V Zener diode in SOD-123 package, rated for 500 mW power dissipation at TL = +75°C and 370 mW at TA = +25°C, with 55 Ω maximum Zener impedance at 5 mA test current and ±5% voltage tolerance (18.8–21.2 V). It serves as a precision voltage reference or overvoltage clamp in low-power analog and digital supply rails.
For engineers reviewing the BZT52C20-7-F datasheet, BZT52C20-7-F pinout, BZT52C20-7-F application, or BZT52C20-7-F equivalent, key selection criteria include its 20 V nominal Zener voltage, 5 mA test current, 55 Ω dynamic impedance, -3.5 mV/°C temperature coefficient, and SOD-123 footprint compatibility with automated PCB assembly.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across a load under varying current conditions. Its planar die construction ensures consistent breakdown characteristics and low leakage, with 0.1 µA maximum reverse current at 14.4 V and 0.1 µA at 18.0 V.
The device exhibits a negative temperature coefficient of -3.5 mV/°C, enabling predictable drift compensation in temperature-sensitive references. Thermal resistance is 338 °C/W junction-to-ambient (on FR-4 with 1-inch copper pad) and 150 °C/W junction-to-lead, supporting reliable operation up to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20 V nominal, 18.8–21.2 V range at 5 mA - defines clamping/reference level with ±5% tolerance |
| Power Dissipation | 370 mW at +25°C ambient - sets max continuous DC power without heatsinking |
| Zener Impedance (ZZT) | 55 Ω max at 5 mA - determines voltage regulation stiffness under load variation |
| Reverse Current (IR) | 0.1 µA max at 14.4 V - ensures minimal leakage in high-impedance bias networks |
| Temperature Coefficient | -3.5 mV/°C - enables predictable thermal drift modeling in precision references |
| Junction Temperature Range | -65°C to +150°C - supports industrial and automotive under-hood environments |
Pinout & Package
Package: SOD-123 - surface-mount plastic case with cathode band marking, 0.010 g weight, UL 94V-0 flammability rating, and matte tin-plated Alloy 42 leadframe.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side in reverse-bias configuration; forms reference ground return path |
| Cathode | Reverse breakdown terminal / Zener voltage output node | Marked with band; delivers regulated 20 V when biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures tight Zener voltage distribution and repeatable breakdown behavior across production lots |
| 500 mW power rating at TL = +75°C | Supports higher transient power handling when mounted on thermally enhanced pads or leads |
| AEC-Q101 qualified | Validated for automotive applications requiring high reliability and stress-test compliance |
| Lead-free, halogen-free, RoHS-compliant | Meets global environmental regulations without compromising solderability or long-term reliability |
Applications
| Power Supply Voltage Reference | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulators or ADC reference buffers. IC Role / Device Role / Timing Role: Provides fixed 20 V reference point for error amplifier input or bandgap calibration. Use Value: Maintains ±0.5% output stability over 0–70°C due to low dynamic impedance and predictable TC. |
Use Scenario: Protecting microcontroller I/O pins from ESD-induced transients. IC Role / Device Role / Timing Role: Shunts surge current above 21.2 V to ground before damage occurs. Use Value: Limits clamping voltage to ≤21.2 V with <0.1 µA leakage below 14.4 V, preserving signal integrity. |
| Automotive Sensor Biasing | Industrial Signal Conditioning |
Use Scenario: Supplying stable excitation voltage to resistive temperature sensors (RTDs) in engine control units. IC Role / Device Role / Timing Role: Acts as primary voltage source for Wheatstone bridge biasing network. Use Value: AEC-Q101 qualification and -65°C to +150°C operation ensure reliability in under-hood environments. |
Use Scenario: Level-shifting and rail-clamping in 4–20 mA transmitter front-ends. IC Role / Device Role / Timing Role: Clamps analog output stage to prevent saturation during fault conditions. Use Value: 55 Ω Zener impedance ensures fast response to overvoltage events without oscillation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5242B-7-F | Same 20 V Zener voltage, but SOT-23 package (smaller footprint, higher thermal resistance) | Preferred where board space is constrained but thermal derating must be verified | Select when layout density outweighs thermal performance needs |
| 1N4744A | Through-hole DO-41 package, 1 W power rating, ±5% tolerance, 22 Ω ZZT | Suitable for prototyping or high-reliability through-hole assemblies, not SMT production | Choose for hand-soldered test fixtures or legacy through-hole designs |
Compared with MMBZ5242B-7-F, BZT52C20-7-F offers lower thermal resistance (150 °C/W vs. ~200 °C/W) and better suitability for automated reflow; versus 1N4744A, it enables miniaturized SMT layouts but requires tighter thermal management on dense boards.
Availability
BZT52C20-7-F is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O protection circuits, and consumer power adapter reference designs requiring stable component supply and AEC-Q101 compliance.
Supply support for BZT52C20-7-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 computing markets.
The BZT52 series belongs to Diodes' general-purpose Zener diode product line, designed specifically for cost-effective, high-volume voltage regulation and transient suppression in SMT applications.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The BZT52C20-7-F has a nominal Zener voltage of 20 V with a guaranteed range of 18.8 V to 21.2 V at 5 mA test current. Breakdown begins within this range; operation above 21.2 V risks exceeding power limits unless current is strictly limited by external series resistance.
Is this part suitable for use in automotive applications?
Yes - BZT52C20-7-F is explicitly qualified to AEC-Q101 standards, including stress testing for temperature cycling, humidity, and mechanical shock. Its -65°C to +150°C operating range and halogen-free "Green" construction meet automotive electronics requirements.
How does the temperature coefficient affect circuit performance?
With a temperature coefficient of -3.5 mV/°C, the Zener voltage decreases by approximately 0.35 V over a 100°C rise. This must be accounted for in precision references; however, it enables predictable compensation when paired with positive-TC components like silicon diodes.
What is the recommended PCB pad layout for optimal thermal performance?
Diodes Incorporated specifies a 1-inch copper pad layout on FR-4 for thermal resistance measurements. Recommended pad dimensions are X = 0.900 mm, X1 = 4.050 mm, Y = 0.950 mm per their SOD-123 outline drawing, with thermal vias strongly advised for sustained >200 mW operation.
BZT52C20-7-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):
- 20 V
- Tolerance:
- ±6%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 55 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 14 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
BZT52C20-7-F FAQ
1.How can I place an order for BZT52C20-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52C20-7-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 BZT52C20-7-F reliable?
The price and inventory of BZT52C20-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52C20-7-F is usually 5 days.
3.What payment methods are accepted for BZT52C20-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52C20-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52C20-7-F?
BZT52C20-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52C20-7-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 BZT52C20-7-F?
For technical support, including BZT52C20-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52C20-7-F requirements.
6.How does Aetrix verify that BZT52C20-7-F is sourced from the original manufacturer or authorized distributors?
All BZT52C20-7-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 BZT52C20-7-F meets industry standards.
7.What is the process for return or replacement of BZT52C20-7-F?
All BZT52C20-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BZT52C20-7-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 BZT52C20-7-F part is unused and in its original packaging.
Return procedure for BZT52C20-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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