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Taiwan Semiconductor Corporation BZT52C43-G
- Part No.:
- BZT52C43-G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
BZT52C43-G.pdf
- Description:
- DIODE ZENER 43V 350MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:8,559
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Product details
Overview
BZT52C43-G from Taiwan Semiconductor is a 43 V ±5% tolerance surface-mount Zener diode in SOD-123 package, rated for 350 mW power dissipation, with 100 Ω typical zener impedance at 5 mA test current and 0.1 µA maximum leakage at 32 V reverse bias. It serves as a precision voltage reference or overvoltage clamp in low-power DC regulation circuits.
For engineers reviewing the BZT52C43-G datasheet, BZT52C43-G pinout, BZT52C43-G application, or BZT52C43-G equivalent, key selection criteria include its nominal 43 V zener voltage, tight 5% tolerance, SOD-123 footprint compatibility, thermal resistance of 357 °C/W, and operation across –55 °C to +150 °C junction temperature range.
Technical Context
The BZT52C43-G operates as a single-die, silicon planar Zener diode optimized for stable voltage regulation under reverse-biased conditions. Its 43 V nominal breakdown voltage is specified at 5 mA test current (IZT), with 100 Ω dynamic impedance (ZZT) and 700 Ω maximum knee impedance (ZZK) at 1 mA, ensuring predictable clamping behavior in feedback and protection paths.
Thermal performance is defined by a junction-to-ambient thermal resistance of 357 °C/W and a maximum junction temperature of +150 °C. The device meets JESD201 Class 1A whisker resistance and J-STD-020 Moisture Sensitivity Level 1, supporting standard reflow assembly without preconditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 40.0–46.0 V @ IZT = 5 mA - defines precise clamping threshold for 43 V nominal regulation |
| Power Dissipation (PD) | 350 mW - limits continuous steady-state power handling in SOD-123 package |
| Zener Impedance (ZZT) | 100 Ω @ IZT = 5 mA - indicates low dynamic resistance for stable voltage reference |
| Leakage Current (IR) | 0.1 µA @ VR = 32.0 V - ensures minimal standby current in high-impedance bias networks |
| Junction Temperature Range | –55 °C to +150 °C - supports operation in industrial and automotive ambient environments |
| Forward Voltage (VF) | 0.9 V @ IF = 10 mA - enables use as low-drop rectifier or ESD path in bidirectional protection |
| Temperature Coefficient | +37.6 mV/°C @ IZTC = 2 mA - quantifies voltage drift with temperature for stability-critical designs |
Pinout & Package
Package: SOD-123 - surface-mount plastic case with cathode band marking, matte tin-plated leads, UL 94V-0 molding compound, and 10.55 mg typical weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to lower-potential node; forms reference return path in shunt regulator topology |
| Cathode | Zener breakdown terminal / voltage clamp input | Connected to regulated node; conducts when reverse voltage exceeds 43 V nominal threshold |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Ensures ±2.15 V accuracy at 43 V nominal, reducing calibration overhead in fixed-reference designs |
| SOD-123 package with MSL Level 1 | Enables direct placement on standard reflow lines without baking or special handling |
| RoHS and halogen-free compliance | Meets IEC 61249-2-21 and global environmental directives for commercial and industrial PCBs |
| 150 °C maximum junction temperature | Supports reliable operation in enclosed enclosures or near heat-generating components |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp for Microcontroller I/O |
|---|---|
Use Scenario: Stabilizing output voltage in isolated flyback or buck-derived auxiliary supplies. IC Role / Device Role / Timing Role: Shunt voltage reference in optocoupler feedback loop. Use Value: Maintains ±1% output regulation via 43 V Zener threshold, compatible with TL431-based secondary-side control. |
Use Scenario: Protecting 3.3 V or 5 V GPIO pins from transient surges exceeding rail voltage. IC Role / Device Role / Timing Role: Reverse-biased clamping element between I/O line and ground. Use Value: Limits voltage to ≤43 V during ESD or inductive kick events, with <0.1 µA leakage preserving signal integrity. |
| Industrial Sensor Signal Conditioning | Low-Power Battery Voltage Monitor |
Use Scenario: Providing stable reference for analog front-end amplifiers in 4–20 mA transmitters. IC Role / Device Role / Timing Role: Precision voltage reference for ADC bias or op-amp gain-setting network. Use Value: Delivers 43 V reference with 37.6 mV/°C TC and 100 Ω impedance, enabling <0.5% full-scale error over –40 °C to +85 °C. |
Use Scenario: Detecting end-of-life voltage in 36–42 V lithium-ion battery packs. IC Role / Device Role / Timing Role: Zener-based comparator threshold set point in discrete monitor circuit. Use Value: Triggers alert when pack voltage exceeds 43 V, leveraging tight 5% tolerance to avoid premature shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5243B-7-F (Diodes Inc.) | 43 V nominal, ±5%, 350 mW, SOT-23 package - same electrical specs but different footprint | Requires PCB layout change due to 3-pin SOT-23 vs. 2-pin SOD-123; higher thermal resistance (400 °C/W) | Select when existing design uses SOT-23 footprints or requires tighter production lot traceability |
| 1N4749A (ON Semiconductor) | 43 V nominal, ±5%, 1 W rating, DO-41 through-hole package - higher power but incompatible mounting | Not suitable for space-constrained SMT boards; used in legacy through-hole power supplies | Choose only for through-hole prototyping or repair of older equipment where SOD-123 is unavailable |
Compared with MMBZ5243B-7-F and 1N4749A, the BZT52C43-G offers optimal balance of SMT compatibility, thermal performance (357 °C/W), and industrial-grade reliability in the widely adopted SOD-123 outline - making it preferred for new designs targeting automated assembly and compact layouts.
Availability
BZT52C43-G is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller I/O protection, and auxiliary power supply feedback requiring stable component supply, consistent parametric performance, and RoHS-compliant sourcing.
Supply support for BZT52C43-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 devices, analog ICs, and power management solutions for industrial, computing, and consumer markets.
The BZT52C series was designed for cost-effective, high-reliability voltage regulation in space-constrained SMT applications - emphasizing tight tolerance, robust thermal performance, and seamless integration into automated manufacturing flows.
FAQ
What is the exact Zener voltage range for BZT52C43-G?
The BZT52C43-G has a guaranteed Zener voltage range of 40.0 V to 46.0 V at 5 mA test current (IZT), corresponding to its 43 V nominal rating with ±5% tolerance. This range is validated per Taiwan Semiconductor's C2007 specification document and applies under standard 25 °C ambient conditions.
Is BZT52C43-G suitable for high-temperature environments?
Yes, the BZT52C43-G supports continuous operation from –55 °C to +150 °C junction temperature. Its SOD-123 package and silicon construction maintain stable Zener characteristics across this range, with a documented temperature coefficient of +37.6 mV/°C - enabling predictable performance in engine control units or industrial motor drives.
Does BZT52C43-G meet lead-free and RoHS requirements?
Yes, the BZT52C43-G is RoHS compliant and halogen-free per IEC 61249-2-21. Its matte tin-plated leads are solderable per J-STD-002, and the molding compound meets UL 94V-0 flammability standards - confirming full compliance with modern environmental and safety regulations.
What is the maximum power dissipation for BZT52C43-G?
The BZT52C43-G has a maximum power dissipation (PD) of 350 mW at 25 °C ambient temperature. Derating is required above 25 °C per the published power derating curve, with thermal resistance (RθJA) of 357 °C/W - meaning power must be reduced by ~1.0 mW per 0.36 °C rise above ambient.
How is polarity indicated on the BZT52C43-G package?
Polarity is indicated by a visible cathode band on the SOD-123 body of the BZT52C43-G. The banded end corresponds to the cathode terminal, which must be connected to the higher-potential node in Zener regulation or clamping configurations - consistent with standard diode marking conventions and JEDEC SOD-123 mechanical drawings.
BZT52C43-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):
- 43 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 32 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
BZT52C43-G FAQ
1.How can I place an order for BZT52C43-G through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52C43-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 BZT52C43-G reliable?
The price and inventory of BZT52C43-G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52C43-G is usually 5 days.
3.What payment methods are accepted for BZT52C43-G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52C43-G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52C43-G?
BZT52C43-G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52C43-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 BZT52C43-G?
For technical support, including BZT52C43-G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52C43-G requirements.
6.How does Aetrix verify that BZT52C43-G is sourced from the original manufacturer or authorized distributors?
All BZT52C43-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 BZT52C43-G meets industry standards.
7.What is the process for return or replacement of BZT52C43-G?
All BZT52C43-G units undergo pre-shipment inspection (PSI). If there is an issue with BZT52C43-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 BZT52C43-G part is unused and in its original packaging.
Return procedure for BZT52C43-G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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