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Diodes Incorporated BZT52C20-7
- Part No.:
- BZT52C20-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
BZT52C20-7.pdf
- Description:
- DIODE ZENER 20V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:6,441
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Product details
Overview
BZT52C20-7 from Diodes Incorporated is a surface-mount 20V Zener diode in SOD123 package, rated for 500mW power dissipation at TL=+75°C and 370mW at TA=+25°C, with ±5% zener voltage tolerance (18.8–21.2V), 55Ω maximum zener impedance at 5mA, and 0.1µA maximum reverse leakage at 14.4V. It serves as a precision voltage reference or overvoltage clamp in low-power DC regulation circuits.
For engineers reviewing the BZT52C20-7 datasheet, BZT52C20-7 pinout, BZT52C20-7 application, or BZT52C20-7 equivalent, this page delivers verified electrical parameters, thermal derating behavior, SOD123 mechanical layout, and AEC-Q101-qualified alternatives for automotive and industrial power rail stabilization designs.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal test current of 5mA and exhibits a positive temperature coefficient of +14.0mV/°C above 10V, enabling predictable drift compensation in bias networks. Its 338°C/W junction-to-ambient thermal resistance requires careful PCB copper pad design to sustain full power rating.
The device features planar die construction, matte tin-plated alloy 42 leads, and UL 94V-0 molded plastic case - all supporting automated reflow assembly and RoHS/halogen-free compliance. Polarity is marked by a cathode band, and moisture sensitivity is rated Level 1 per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20V nominal, 18.8–21.2V range at 5mA - defines stable clamping threshold for 24V rail protection |
| Power Dissipation (PD) | 370mW at +25°C ambient - limits continuous current to ~18.5mA at 20V without heatsinking |
| Zener Impedance (ZZT) | 55Ω max at 5mA - determines regulation stiffness under load transients |
| Reverse Leakage (IR) | 0.1µA max at 14.4V - ensures minimal quiescent current in high-impedance reference nodes |
| Thermal Resistance (RθJA) | 338°C/W - mandates ≥1-inch² copper pad for full 370mW operation at room temperature |
| Temperature Coefficient | +14.0mV/°C - enables predictable voltage shift across -65°C to +150°C operating range |
Pinout & Package
Package: SOD123 - surface-mount plastic case with cathode band marking; dimensions: 2.65mm × 1.55mm × 1.05mm (L × W × H); weight ≈ 0.010g; UL 94V-0 flammability rating.
| 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 regulator topology |
| Cathode | Zener breakdown terminal / voltage clamp input | Connected to higher-potential rail; conducts when voltage exceeds 20V, diverting excess current to ground |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Enables tight VZ tolerance control and repeatable breakdown characteristics across production lots |
| AEC-Q101 qualification | Validates reliability for automotive body electronics, infotainment power supplies, and engine control module references |
| Lead-free & halogen-free | Meets EU RoHS 2011/65/EU and Diodes Inc.'s "Green" standard (<900ppm Br/Cl, <1000ppm Sb) |
| SOD123 footprint compatibility | Supports high-speed pick-and-place assembly and IPC-7351-compliant PCB land patterns |
Applications
| Industrial Sensor Signal Conditioning | Automotive Body Control Module (BCM) Power Rail Clamp |
|---|---|
Use Scenario: Stabilizing 24V supply rails feeding analog front-ends in pressure/temperature transducers. IC Role / Device Role / Timing Role: Shunt voltage regulator providing 20V reference for ADC bias and op-amp level-shifting networks. Use Value: Maintains ±1% reference stability over -40°C to +105°C ambient, minimizing sensor offset drift. |
Use Scenario: Clamping transient spikes on 12V/24V battery-fed microcontroller I/O lines during load dump events. IC Role / Device Role / Timing Role: Fast-acting overvoltage protector limiting voltage to 21.2V peak before TVS activation. Use Value: Absorbs up to 370mW surge energy without degradation, extending MCU lifetime in harsh vehicle environments. |
| Consumer USB-C Power Delivery Feedback Network | Medical Portable Diagnostic Device Reference |
Use Scenario: Setting precise feedback voltage in buck-boost converters delivering 20V output for USB-C PD negotiation. IC Role / Device Role / Timing Role: Precision voltage reference element in optocoupler feedback loop of isolated flyback controller. Use Value: Enables ±0.5% output regulation accuracy via 5mA test-current stability and low 55Ω dynamic impedance. |
Use Scenario: Providing stable bias voltage for low-noise instrumentation amplifiers in handheld ECG monitors. IC Role / Device Role / Timing Role: Low-leakage (0.1µA) voltage reference source ensuring <10nA input bias error in high-Z biopotential circuits. Use Value: Eliminates measurement drift caused by reference current injection into amplifier input nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5249B-7-F | 20V nominal, ±5% tolerance, 500mW rating, SOD123, but 100Ω ZZT @ 5mA vs. 55Ω | Higher dynamic impedance reduces regulation precision under varying load currents | Select when cost priority outweighs tight voltage regulation; verify loop stability with higher ZZ |
| BZX84-C20-7 | 20V nominal, ±5% tolerance, 300mW rating, SOT-23, 60Ω ZZT @ 5mA, AEC-Q101 qualified | Lower power rating restricts use to sub-15mA applications; smaller footprint increases thermal stress | Choose for space-constrained PCBs where 300mW suffices and SOT-23 placement is preferred |
Compared with MMSZ5249B-7-F and BZX84-C20-7, BZT52C20-7 offers superior regulation stiffness (55Ω vs. 100Ω/60Ω) and higher power headroom (370mW vs. 300mW), making it optimal for 24V rail clamping and precision reference designs requiring low-impedance stability.
Availability
BZT52C20-7 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, automotive body control module (BCM) power rail clamp, and consumer USB-C power delivery feedback network requiring stable component supply across extended temperature ranges and high-reliability production cycles.
Supply support for BZT52C20-7 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 spanning Asia, Europe, and North America.
The BZT52 series belongs to Diodes' general-purpose Zener diode product line, engineered for medium-current voltage regulation and overvoltage protection in cost-sensitive, high-volume applications including automotive, industrial, and consumer electronics.
FAQ
What is the maximum continuous reverse current the BZT52C20-7 can handle at 25°C?
The BZT52C20-7 is rated for 370mW power dissipation at +25°C ambient, corresponding to a maximum continuous reverse current of 18.5mA (370mW ÷ 20V). Exceeding this current without thermal derating risks exceeding junction temperature limits and permanent damage.
Does the BZT52C20-7 meet automotive qualification standards?
Yes - the BZT52C20-7 is qualified to AEC-Q101 standards for high-reliability automotive applications. This includes stress testing for temperature cycling, humidity, mechanical shock, and high-temperature operating life, confirming suitability for under-hood and body electronics systems.
How does the temperature coefficient affect voltage regulation accuracy over temperature?
With a +14.0mV/°C temperature coefficient, the BZT52C20-7's zener voltage increases by 14mV per degree Celsius rise. Over a -40°C to +125°C range, this yields a total shift of +2.31V - critical for designs requiring tight absolute voltage accuracy without external compensation.
Can the BZT52C20-7 be used in place of a 24V Zener diode for overvoltage protection?
No - the BZT52C20-7 is strictly a 20V device (18.8–21.2V range). Using it for 24V rail protection would result in premature conduction and potential failure. For 24V applications, select BZT52C24-7 (22.8–25.6V) or verify system margin against worst-case upper limit of 21.2V.
BZT52C20-7 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):
- 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 FAQ
1.How can I place an order for BZT52C20-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52C20-7 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 BZT52C20-7 reliable?
The price and inventory of BZT52C20-7 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 is usually 5 days.
3.What payment methods are accepted for BZT52C20-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52C20-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52C20-7?
BZT52C20-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52C20-7 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 BZT52C20-7?
For technical support, including BZT52C20-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52C20-7 requirements.
6.How does Aetrix verify that BZT52C20-7 is sourced from the original manufacturer or authorized distributors?
All BZT52C20-7 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 BZT52C20-7 meets industry standards.
7.What is the process for return or replacement of BZT52C20-7?
All BZT52C20-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZT52C20-7, 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 BZT52C20-7 part is unused and in its original packaging.
Return procedure for BZT52C20-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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