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Taiwan Semiconductor Corporation BZT52C20-G
- Part No.:
- BZT52C20-G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
BZT52C20-G.pdf
- Description:
- DIODE ZENER 20V 350MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:4,656
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Product details
Overview
BZT52C20-G from Taiwan Semiconductor is a 20 V ±5% tolerance surface-mount Zener diode in SOD-123 package, rated for 350 mW power dissipation and 5 mA test current, with 55 Ω typical zener impedance at IZT, used for precision voltage regulation in low-power analog and digital supply rails.
For engineers reviewing the BZT52C20-G datasheet, BZT52C20-G pinout, BZT52C20-G application, or BZT52C20-G equivalent, key selection criteria include nominal zener voltage (20 V), tight 5% tolerance, low leakage (<0.1 µA at 14.0 V), thermal stability (14.4 mV/°C tempco), and SOD-123 footprint compatibility with automated assembly.
Technical Context
The BZT52C20-G operates as a single-die, cathode-banded Zener diode optimized for stable reverse-bias voltage reference in DC bias networks and overvoltage clamping circuits. Its junction temperature range of −55°C to +150°C and 357°C/W junction-to-ambient thermal resistance support reliable operation in industrial ambient conditions.
It exhibits a typical zener impedance of 55 Ω at 5 mA test current and 225 Ω at knee current (1 mA), with forward voltage of 0.9 V at 10 mA - enabling predictable conduction behavior in dual-direction protection or reference configurations where bidirectional voltage limiting is not required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener voltage (VZ) | 18.8–21.2 V at 5 mA - ensures ±5% regulation accuracy across production lots for stable 20 V reference generation. |
| Power dissipation (PD) | 350 mW - defines maximum continuous power handling at 25°C ambient; derates linearly above 25°C per 357°C/W RθJA. |
| Zener impedance (ZZT) | 55 Ω at 5 mA - determines output impedance under regulation; lower values improve load regulation and ripple rejection. |
| Leakage current (IR) | <0.1 µA at 14.0 V - guarantees minimal quiescent current draw in high-impedance bias networks and battery-powered circuits. |
| Temperature coefficient | +14.4 mV/°C - quantifies voltage drift with temperature; enables compensation design in precision references. |
| Junction temperature (TJ) | −55°C to +150°C - supports operation in extended industrial environments without thermal shutdown or parameter shift. |
Pinout & Package
Package: SOD-123 - surface-mount plastic case with matte tin-plated leads, moisture sensitivity level 1 (J-STD-020), UL 94V-0 rated molding compound, and cathode polarity indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground node | Connected to lower-potential side in regulation; forms reference return path in shunt regulator topologies. |
| Cathode | Zener breakdown terminal / Voltage reference output | Connected to regulated rail; maintains stable 20 V relative to anode when reverse-biased above VZ. |
Key Features
| Feature | Design Value |
|---|---|
| 5% zener voltage tolerance | Enables tighter regulation than 10% parts, reducing need for post-regulation trimming in mid-precision applications. |
| SOD-123 package | Standardized 2.7 × 1.6 mm footprint compatible with high-speed pick-and-place and reflow soldering per J-STD-020 Level 1. |
| RoHS & halogen-free compliance | Meets IEC 61249-2-21 and EU RoHS directives - required for commercial and industrial equipment sold in regulated markets. |
| 150°C max junction temperature | Supports sustained operation in enclosed enclosures or near heat-generating components without derating penalties. |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing bias voltage for op-amp input stages in 4–20 mA loop transmitters operating at 24 V supply. IC Role / Device Role / Timing Role: Shunt voltage reference providing fixed 20 V reference for DAC output scaling and sensor excitation. Use Value: Tight 5% tolerance and low tempco ensure <±1.5% full-scale error across −40°C to +85°C ambient range. |
Use Scenario: Clamping transient surges on USB VBUS line during hot-plug events or ESD discharge. IC Role / Device Role / Timing Role: Standby-mode zener clamp absorbing energy before TVS activation, reducing stress on primary protection. Use Value: 350 mW rating and 55 Ω impedance allow controlled clamping at ~21.2 V without thermal runaway during 100 ns transients. |
| Low-Power Microcontroller Reset Circuit | Automotive Body Control Module Reference |
Use Scenario: Generating clean reset threshold for 3.3 V MCU using resistor divider from 5 V rail with BZT52C20-G as upper leg. IC Role / Device Role / Timing Role: Precision voltage divider element defining accurate 2.5 V reset threshold via ratio matching. Use Value: Low leakage (<0.1 µA) prevents significant divider current error, maintaining reset accuracy within ±2% over temperature. |
Use Scenario: Providing stable 20 V reference for LIN bus transceiver biasing in 12 V automotive subsystems with boost conversion. IC Role / Device Role / Timing Role: Secondary regulation stage after DC-DC converter, rejecting ripple and load-induced fluctuations. Use Value: 14.4 mV/°C tempco and −55°C to +150°C rating ensure consistent transceiver bias across engine bay thermal cycles. |
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 (Diodes Inc.) | 20 V nominal, 5% tolerance, 350 mW, SOD-123, but higher ZZT = 70 Ω at 20 mA test current. | Higher dynamic impedance reduces regulation accuracy under varying load; less suitable for precision biasing. | Preferable only if legacy design uses Diodes Inc. footprint and sourcing constraints override impedance requirements. |
| SZBZX84-C20LT1G (onsemi) | 20 V nominal, 5% tolerance, 300 mW, SOT-23 - smaller package, lower power rating, and 30 Ω ZZT at 5 mA. | SOT-23 requires PCB redesign; 300 mW limits use in higher-current clamping; lower ZZT improves regulation but reduces surge margin. | Select only when board space is critical and power demand stays below 300 mW; verify thermal performance in final layout. |
Compared with MMBZ5242B-7-F and SZBZX84-C20LT1G, the BZT52C20-G offers optimal balance of 55 Ω impedance, 350 mW rating, and SOD-123 manufacturability - making it preferred for cost-sensitive industrial regulation where thermal headroom and accuracy coexist.
Availability
BZT52C20-G is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB port protection, microcontroller reset circuits, and automotive body control module references requiring stable component supply and long-term obsolescence management.
Supply support for BZT52C20-G 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, analog ICs, and protection components since 1979.
The BZT52C series was designed for high-volume, cost-effective voltage regulation and clamping in consumer, industrial, and computing applications - emphasizing reliability, JEDEC-compliant packaging, and tight parametric control.
FAQ
What is the nominal zener voltage and tolerance of the BZT52C20-G?
The BZT52C20-G has a nominal zener voltage of 20 V with a guaranteed tolerance of ±5%, meaning its actual breakdown voltage falls between 18.8 V and 21.2 V when tested at 5 mA. This specification is confirmed in the Electrical Specifications table of Taiwan Semiconductor's C2007 datasheet revision and applies across the full operating temperature range.
Can the BZT52C20-G be used in place of a 24 V zener diode?
No - the BZT52C20-G is specifically rated for 20 V nominal zener voltage and must not be substituted for a 24 V part like BZT52C24-G without circuit validation. Its 18.8–21.2 V range does not overlap the 22.8–25.6 V range of the 24 V variant, and using it in a 24 V design would result in premature conduction and potential system malfunction.
What is the maximum power dissipation of the BZT52C20-G and how does it derate with temperature?
The BZT52C20-G has a maximum power dissipation of 350 mW at 25°C ambient. It derates linearly above 25°C at a rate determined by its 357°C/W junction-to-ambient thermal resistance - approximately 3.5 mW/°C reduction beyond 25°C. Full derating data is provided in Figure 4 (Power Derating Curve) of the official datasheet.
Is the BZT52C20-G RoHS and halogen-free compliant?
Yes - the BZT52C20-G meets EU RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. These compliance statements are explicitly declared in the FEATURES section of Taiwan Semiconductor's BZT52C2V4-G–BZT52C75-G datasheet (Version C2007), and the device carries appropriate marking and documentation for export to regulated markets.
What is the cathode identification method on the BZT52C20-G package?
The cathode of the BZT52C20-G is identified by a distinct band printed on the SOD-123 case - consistent with JEDEC standard polarity marking for small-outline diodes. This band aligns with the cathode terminal, which must be connected to the higher-potential node in zener regulation or clamping configurations.
BZT52C20-G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 20 V
- Tolerance:
- ±5%
- Power - Max:
- 350 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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
BZT52C20-G FAQ
1.How can I place an order for BZT52C20-G through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52C20-G 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-G reliable?
The price and inventory of BZT52C20-G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52C20-G is usually 5 days.
3.What payment methods are accepted for BZT52C20-G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52C20-G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52C20-G?
BZT52C20-G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52C20-G 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-G?
For technical support, including BZT52C20-G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52C20-G requirements.
6.How does Aetrix verify that BZT52C20-G is sourced from the original manufacturer or authorized distributors?
All BZT52C20-G 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-G meets industry standards.
7.What is the process for return or replacement of BZT52C20-G?
All BZT52C20-G units undergo pre-shipment inspection (PSI). If there is an issue with BZT52C20-G, 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-G part is unused and in its original packaging.
Return procedure for BZT52C20-G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZT52C20-G Tags
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