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Taiwan Semiconductor Corporation BZX85C43
- Part No.:
- BZX85C43
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZX85C43.pdf
- Description:
- DIODE ZENER 43V 1.3W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:8,614
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Product details
Overview
BZX85C43 from Taiwan Semiconductor is a 1.3W, ±5% tolerance Zener diode with nominal breakdown voltage of 43V, tested at 50mA, featuring DO-41 glass package and hermetic sealing for stable voltage reference in low-power DC/DC converters.
For engineers reviewing the BZX85C43 datasheet, BZX85C43 pinout, BZX85C43 application, or BZX85C43 equivalent, key selection considerations include its 40–46V Zener range, 1000Ω maximum impedance at 50mA, 0.25µA leakage at 30V, junction temperature rating up to +200°C, and RoHS-compliant tin-plated leads.
Technical Context
The BZX85C43 operates as a single-die, silicon planar Zener diode optimized for precision voltage regulation and clamping in linear power supplies and adapter circuits. Its 1.3W power dissipation and 130°C/W junction-to-ambient thermal resistance define its steady-state thermal envelope under continuous DC bias.
Zener voltage is specified under 10ms pulse test conditions with ±5% tolerance; impedance is measured using 60Hz AC superimposed on DC test current (IZT = 50mA), yielding a maximum dynamic impedance of 1000Ω - critical for ripple suppression in reference stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VZ @ IZT | 40.0–46.0V at 50mA - defines usable regulation window for stable 43V reference design |
| PD | 1.3W - maximum continuous power dissipation at TA = 25°C, derates above 25°C per RθJA |
| RθJA | 130°C/W - determines junction temperature rise under given ambient and PCB layout conditions |
| ZZT @ IZT | ≤1000Ω - limits output voltage variation under load transients in feedback or reference paths |
| IR @ VR | ≤0.5µA at 30V - ensures minimal parasitic current in high-impedance sensing or standby circuits |
| TJ max | +200°C - enables operation in high-temperature industrial environments without derating |
Pinout & Package
DO-41 hermetically sealed glass package with axial leads; cathode indicated by colored band; pure tin-plated leads compliant with J-STD-002 solderability standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward-biased terminal during conduction | Connected to lower-potential node in reverse-bias regulation configuration |
| Cathode | Zener breakdown terminal | Connected to higher-potential node; band-marked lead used for polarity identification in PCB assembly |
Key Features
| Feature | Design Value |
|---|---|
| ±5% VZ tolerance | Enables predictable regulation without post-production trimming in cost-sensitive consumer adapters |
| Hermetically sealed glass case | Prevents moisture ingress and long-term parameter drift in humid or outdoor-rated lighting modules |
| RoHS-compliant tin plating | Supports lead-free reflow soldering while maintaining wetting reliability per J-STD-002 |
| Single-die DO-41 configuration | Provides standardized mechanical footprint compatible with legacy axial-component automated insertion equipment |
Applications
| Low-Voltage Stabilizers | On-Board DC/DC Converters |
|---|---|
Use Scenario: Regulation of 5V or 3.3V auxiliary rails in industrial PLC I/O modules where primary supply varies ±15%. IC Role / Device Role / Timing Role: Voltage reference element in shunt regulator topology, absorbing excess current to maintain stable output. Use Value: Delivers 43V Zener clamp with ≤1000Ω dynamic impedance, minimizing output ripple under 10–50mA load steps. | Use Scenario: Feedback voltage reference for isolated flyback controllers powering microcontroller subsystems. IC Role / Device Role / Timing Role: Precision voltage threshold device in optocoupler-coupled feedback loop, setting regulated output voltage. Use Value: Provides stable 43V reference with 0.25µA leakage at 30V, reducing error amplifier input offset in closed-loop control. |
| Lighting Applications | Adapters |
Use Scenario: Overvoltage protection and bias stabilization in LED driver ICs for commercial downlights. IC Role / Device Role / Timing Role: Clamping diode across gate drive or sense resistor to limit transient excursions during MOSFET switching. Use Value: Withstands 200°C junction temperature and exhibits <0.5µA leakage at 30V, ensuring reliability in thermally constrained LED housings. | Use Scenario: Voltage reference in linear wall adapters supplying analog sensors or RS-485 transceivers. IC Role / Device Role / Timing Role: Shunt regulator element establishing fixed bias point for series pass transistor base drive network. Use Value: Maintains ±5% regulation accuracy over -65°C to +200°C, supporting wide ambient operation in unregulated AC/DC front-ends. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4749A | Same 43V nominal VZ, but ±5% tolerance and 1W PD (vs. BZX85C43's 1.3W) | Limited power handling in sustained overload conditions; less margin in high-ambient adapter designs | Preferred where legacy 1N47xx footprint is required and thermal headroom is sufficient |
| MMBZ5256B | SMD SOT-23 package, same 43V VZ, 0.2W PD, ±5% tolerance | Not suitable for through-hole board layouts or high-power dissipation; requires rework of PCB land pattern | Selected when space-constrained PCBs demand surface-mount integration and power demand is ≤200mW |
Compared with 1N4749A and MMBZ5256B, the BZX85C43 offers higher power dissipation (1.3W) in a through-hole DO-41 package with identical 43V regulation, making it optimal for thermally demanding adapter and industrial converter applications where axial mounting and robustness are prioritized.
Availability
BZX85C43 is available at Aetrix Electronics and suitable for low-voltage stabilizers, on-board DC/DC converters, lighting applications, and adapters requiring stable component supply with full traceability and long-lifecycle support.
Supply support for BZX85C43 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 for industrial and consumer markets.
The BZX85C series is part of TSC's Zener diode product line engineered for reliable voltage reference and overvoltage clamping in cost-sensitive, high-volume power management applications.
FAQ
What is the Zener voltage tolerance for BZX85C43?
The BZX85C43 has a nominal Zener voltage of 43V with a standard tolerance of ±5%, meaning its actual breakdown voltage falls between 40.0V and 46.0V when tested at 50mA under pulse conditions. This tolerance is confirmed in the Electrical Specifications table of the official Taiwan Semiconductor datasheet (Version H2301). The BZX85C43 maintains this specification across its rated junction temperature range of –65°C to +200°C.
What is the maximum power dissipation of BZX85C43?
The BZX85C43 has a maximum power dissipation (PD) of 1.3W at an ambient temperature of 25°C. This rating decreases linearly above 25°C based on its junction-to-ambient thermal resistance of 130°C/W. Derating curves in the Absolute Maximum Ratings section confirm safe operation up to +200°C junction temperature. The BZX85C43 must be mounted with adequate PCB copper area or airflow to sustain continuous 1.3W dissipation.
Is BZX85C43 RoHS compliant?
Yes, the BZX85C43 is RoHS compliant, as explicitly stated in the FEATURES section of the Taiwan Semiconductor datasheet. Its pure tin-plated leads meet J-STD-002 solderability requirements and contain no restricted substances per EU Directive 2011/65/EU. The BZX85C43 uses green compound encapsulation and is marked with standard RoHS identifiers in its packaging and marking diagram.
What package type does BZX85C43 use?
The BZX85C43 uses the DO-41 axial-lead, hermetically sealed glass package. Dimensions are fully specified in the Package Outline Dimensions drawing (DWG NO. HQ2SD07-DO41-059 REV A), with body diameter 2.80mm, lead diameter 0.86mm, and overall length ≥25.40mm. The BZX85C43's cathode is identified by a visible color band on the glass body, consistent with industry-standard polarity marking.
What is the Zener impedance of BZX85C43 at its test current?
The BZX85C43 has a maximum Zener impedance (ZZT) of 1000Ω at its specified test current (IZT) of 50mA. This value is measured using a 60Hz AC signal superimposed on the DC bias, per the methodology defined in the datasheet notes. The BZX85C43's impedance directly impacts regulation stability - lower values improve ripple rejection in reference circuits, and 1000Ω reflects its suitability for moderate-precision applications like adapter feedback networks.
BZX85C43 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 43 V
- Tolerance:
- ±5%
- Power - Max:
- 1.3 W
- Impedance (Max) (Zzt):
- 50 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 30 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 10 mA
- Operating Temperature:
- -65°C ~ 200°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AL (DO-41)
BZX85C43 FAQ
1.How can I place an order for BZX85C43 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX85C43 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 BZX85C43 reliable?
The price and inventory of BZX85C43 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX85C43 is usually 5 days.
3.What payment methods are accepted for BZX85C43?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX85C43 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX85C43?
BZX85C43 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX85C43 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 BZX85C43?
For technical support, including BZX85C43 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX85C43 requirements.
6.How does Aetrix verify that BZX85C43 is sourced from the original manufacturer or authorized distributors?
All BZX85C43 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 BZX85C43 meets industry standards.
7.What is the process for return or replacement of BZX85C43?
All BZX85C43 units undergo pre-shipment inspection (PSI). If there is an issue with BZX85C43, 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 BZX85C43 part is unused and in its original packaging.
Return procedure for BZX85C43:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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