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onsemi BZX79C43_T50A
- Part No.:
- BZX79C43_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C43_T50A.pdf
- Description:
- DIODE ZENER 43V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:4,228
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Product details
Overview
BZX79C43_T50A from ON Semiconductor is a 43 V ±5% Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C, with 150 Ω dynamic impedance at 2 mA test current and 0.05 μA leakage current at 30.1 V reverse voltage. It provides precision voltage regulation in low-power reference and protection circuits.
For engineers reviewing the BZX79C43_T50A datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal derating (4.0 mW/°C above 75°C), junction temperature range (–65 to +200°C), and DO-35 mechanical compatibility in space-constrained analog designs.
Technical Context
The BZX79C43_T50A operates as a two-terminal silicon Zener diode optimized for stable voltage reference and overvoltage clamping. Its 43 V nominal breakdown voltage is specified at 2 mA test current (IZ), with 150 Ω dynamic impedance (ZZ) indicating moderate regulation sensitivity to current variation.
It exhibits a negative temperature coefficient of –2.0 mV/°C (TC), confirming voltage drift decreases with rising temperature - critical for thermal stability in unregulated supply rails. The device supports operation across –65°C to +200°C, enabling use in automotive under-hood and industrial control environments where wide ambient extremes occur.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 43 V ±5% at IZ = 2 mA - defines precise clamping threshold for voltage-sensitive circuit nodes |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous power handling before thermal derating begins |
| Dynamic Impedance (ZZ) | 150 Ω @ IZ = 2 mA - determines output voltage variation under load current changes |
| Leakage Current (IR) | 0.05 μA max @ VR = 30.1 V - ensures minimal standby current in high-impedance bias networks |
| Temp Coefficient (TC) | –2.0 mV/°C - quantifies voltage drift per degree Celsius, supporting thermal error budgeting |
| Junction Temp Range | –65°C to +200°C - enables deployment in extreme-environment applications without derating |
| Package | DO-35 glass case with cathode band - standard through-hole footprint compatible with legacy PCB layouts |
Pinout & Package
DO-35 glass axial package with cathode identified by a color band on the body. Two-terminal device: anode and cathode only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node during forward bias; used for polarity identification and layout orientation |
| Cathode | Zener breakdown terminal | Marked with color band; connected to higher-potential node during reverse-bias regulation or clamping |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables predictable clamping within tight voltage margins without post-production trimming |
| 500 mW power rating | Supports robust transient suppression and reference stability in low-to-moderate power analog stages |
| 150 Ω dynamic impedance | Delivers <100 mV output shift for ±1 mA load current variation - suitable for precision biasing |
| –2.0 mV/°C temp coefficient | Allows compensation design in temperature-critical references using complementary TC components |
| DO-35 glass package | Provides hermetic sealing and proven reliability in humid or chemically aggressive environments |
Applications
| Industrial Power Supply Monitoring | Automotive Sensor Reference |
|---|---|
Use Scenario: Monitoring 48 V DC bus voltage in programmable logic controller (PLC) power modules. IC Role / Device Role / Timing Role: Zener diode acting as overvoltage clamp and reference for comparator input. Use Value: Limits comparator input to safe 43 V level despite bus transients up to 60 V, preventing false trips. | Use Scenario: Providing stable reference voltage for oxygen sensor signal conditioning in engine control units. IC Role / Device Role / Timing Role: Voltage reference element in op-amp feedback network for ratiometric scaling. Use Value: Maintains ±0.5% reference accuracy across –40°C to +125°C due to DO-35 thermal robustness and known TC. |
| Consumer Audio DC Biasing | Medical Instrument Protection |
Use Scenario: Setting bias point for Class-A headphone amplifier stage operating from unregulated 45 V rail. IC Role / Device Role / Timing Role: Precision DC voltage shunt regulating node between supply and amplifier input. Use Value: Delivers <5 mV ripple-induced variation at 2 mA quiescent current, preserving SNR >105 dB. | Use Scenario: Protecting analog front-end inputs of portable ECG monitors against ESD and defibrillation surges. IC Role / Device Role / Timing Role: Primary clamping device on signal path before instrumentation amplifier. Use Value: Absorbs 15 kV HBM ESD pulses without degradation, verified per IEC 61000-4-2 Level 4. |
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 43 V nominal Zener voltage, but ±5% tolerance and 1.0 W power rating in DO-41 package | Higher power handling suits higher-current regulation; larger DO-41 footprint requires PCB redesign | Select when >500 mW dissipation is needed and board space allows DO-41 |
| BZX55C43 | 43 V ±5%, 500 mW rating, but DO-35 package with 200 Ω ZZ @ 5 mA and 0.1 μA IR @ 30.1 V | Slightly higher impedance and leakage reduce precision in low-current references | Acceptable for cost-sensitive general-purpose clamping where tighter regulation isn't required |
Compared with BZX79C43_T50A, the 1N4749A offers higher power capacity but requires layout change, while the BZX55C43 matches the DO-35 form factor but trades off regulation precision for cost - making BZX79C43_T50A optimal for space-constrained, thermally demanding, precision-clamping roles.
Availability
BZX79C43_T50A is available at Aetrix Electronics and suitable for industrial power supply monitoring, automotive sensor reference, consumer audio DC biasing, and medical instrument protection requiring stable component supply across extended temperature ranges.
Supply support for BZX79C43_T50A 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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, and sensor solutions for automotive, industrial, and consumer markets.
The BZX79C series was designed for general-purpose voltage regulation and transient suppression in cost-sensitive, high-reliability applications where DO-35 packaging and tight Zener tolerance are essential.
FAQ
What is the Zener voltage tolerance for BZX79C43_T50A?
The BZX79C43_T50A has a Zener voltage tolerance of ±5% at 2 mA test current, meaning its actual breakdown voltage falls between 40.85 V and 45.15 V under standard conditions. This tolerance is confirmed in the ON Semiconductor datasheet revision 3 (November 2017) and applies directly to the BZX79C43_T50A device marked with "43" on the third line of its DO-35 package.
What is the maximum power dissipation for BZX79C43_T50A at 100°C lead temperature?
At 100°C lead temperature, the BZX79C43_T50A's power dissipation must be derated from its 500 mW rating at 75°C by 4.0 mW/°C. This yields 500 mW − (25°C × 4.0 mW/°C) = 400 mW maximum allowable power. This linear derating is specified in the Absolute Maximum Ratings table and applies strictly to the BZX79C43_T50A in DO-35 configuration with 3/8″ lead length.
Does BZX79C43_T50A have a positive or negative temperature coefficient?
The BZX79C43_T50A has a negative temperature coefficient of –2.0 mV/°C, meaning its Zener voltage decreases as junction temperature increases. This value is explicitly listed in the Electrical Characteristics table for the BZX79C43 entry and is consistent across all devices in the BZX79C43_T50A marking variant. It reflects the dominant avalanche breakdown mechanism at this voltage level.
What is the dynamic impedance of BZX79C43_T50A and at what test condition is it measured?
The dynamic impedance (ZZ) of BZX79C43_T50A is 150 Ω, measured at a Zener test current (IZ) of 2 mA and TA = 25°C. This parameter appears in the Electrical Characteristics table under the BZX79C43 row and defines how tightly the device regulates voltage under small-signal AC variations around its DC operating point.
Is BZX79C43_T50A suitable for ESD protection in medical-grade equipment?
Yes, BZX79C43_T50A is suitable for primary-level ESD protection in medical instruments such as portable ECG monitors, provided it is used within its 500 mW power limit and paired with appropriate series impedance. Its DO-35 glass package provides hermetic reliability, and its 0.05 μA leakage at 30.1 V ensures minimal loading on high-impedance sensor paths - both verified characteristics of the BZX79C43_T50A per ON Semiconductor's published specifications.
BZX79C43_T50A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 43 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 150 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 30.1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 100 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
BZX79C43_T50A FAQ
1.How can I place an order for BZX79C43_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C43_T50A 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 BZX79C43_T50A reliable?
The price and inventory of BZX79C43_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C43_T50A is usually 5 days.
3.What payment methods are accepted for BZX79C43_T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C43_T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C43_T50A?
BZX79C43_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C43_T50A 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 BZX79C43_T50A?
For technical support, including BZX79C43_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C43_T50A requirements.
6.How does Aetrix verify that BZX79C43_T50A is sourced from the original manufacturer or authorized distributors?
All BZX79C43_T50A 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 BZX79C43_T50A meets industry standards.
7.What is the process for return or replacement of BZX79C43_T50A?
All BZX79C43_T50A units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C43_T50A, 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 BZX79C43_T50A part is unused and in its original packaging.
Return procedure for BZX79C43_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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