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onsemi 1N4743A-T50A
- Part No.:
- 1N4743A-T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4743A-T50A.pdf
- Description:
- DIODE ZENER 13V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:4,973
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Product details
Overview
1N4743A-T50A from ON Semiconductor is a 13 V, 1 W silicon Zener diode in DO-41 glass package, designed for precision voltage regulation and reference applications at 25 mA test current, with 19 Ω typical Zener impedance, ±5% tolerance, and operating junction temperature range of –65 °C to +200 °C.
For engineers reviewing the 1N4743A-T50A datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage (13 V), power dissipation (1.0 W @ TL ≤ 50 °C), thermal derating (6.67 mW/°C above 50 °C), leakage current (≤ 5 µA at 9.9 V), and non-repetitive peak reverse current (344 mA).
Technical Context
The 1N4743A-T50A operates as a two-terminal, reverse-biased voltage reference device, maintaining stable output voltage across a defined current range (IZK = 0.25 mA to IZ = 25 mA). Its Zener breakdown mechanism provides predictable, repeatable regulation with low dynamic impedance (19 Ω typical at 25 mA) and tight voltage tolerance (±5%).
It is rated for 1.0 W continuous power dissipation at lead temperature ≤ 50 °C, with linear thermal derating beyond that point. The device supports operation over an extended temperature range (–65 °C to +200 °C), making it suitable for industrial and automotive environments where thermal stability is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 13.0 V nominal at 25 mA test current - defines regulated output voltage under standard bias conditions |
| Power Dissipation (PD) | 1.0 W @ TL ≤ 50 °C - maximum continuous power handling before thermal derating applies |
| Zener Impedance (ZZ) | 19 Ω typical at IZ = 25 mA - indicates small-signal AC resistance affecting regulation accuracy under load transients |
| Tolerance | ±5% - specifies allowable deviation of VZ across production lot at 25 °C |
| Leakage Current (IR) | ≤ 5 µA at VR = 9.9 V - ensures minimal off-state conduction below knee voltage |
| Operating Temperature | –65 °C to +200 °C - enables use in high-temperature industrial, under-hood, or power supply designs |
Pinout & Package
DO-41 glass axial package with cathode indicated by a single black band on the case. Two-terminal device: anode and cathode are unidirectional, with cathode serving as the regulated output reference node when reverse biased.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit common or ground when used in standard shunt regulator configuration |
| Cathode | Zener breakdown terminal / Regulated output node | Provides stable 13 V reference relative to anode when reverse biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| Stable 13 V reference | Guaranteed 12.35–13.65 V range at 25 mA ensures compatibility with 12 V system rails and logic-level sensing |
| Low dynamic impedance | 19 Ω typical at 25 mA improves line/load regulation and reduces output ripple in feedback paths |
| High surge capability | 344 mA non-repetitive peak reverse current supports transient overvoltage clamping without failure |
| Extended temperature operation | –65 °C to +200 °C junction range allows deployment in harsh environments including motor controls and power converters |
Applications
| Industrial Power Supply Regulation | Automotive ECU Reference Voltage |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated flyback or forward converter auxiliary supplies. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 13 V setpoint for optocoupler-based primary-side regulation. Use Value: Maintains ±1% output voltage accuracy over temperature and line variations due to low ZZ and tight tolerance. |
Use Scenario: Generating stable reference for analog sensor signal conditioning in engine control units. IC Role / Device Role / Timing Role: Voltage clamp and reference source for 5 V LDO input stage protection and ADC reference scaling. Use Value: Withstands automotive load dump transients up to 344 mA peak reverse current while holding regulation within spec. |
| Programmable Logic Controller I/O Protection | Test & Measurement Equipment Calibration |
Use Scenario: Overvoltage clamping on 24 V digital input channels exposed to field wiring surges. IC Role / Device Role / Timing Role: Bidirectional transient suppressor and DC reference in parallel with input Schottky diode. Use Value: Limits input voltage to ≤13.65 V during fault events while drawing <5 µA leakage under normal 24 V operation. |
Use Scenario: Precision voltage reference in handheld multimeter front-end analog sections. IC Role / Device Role / Timing Role: Stable 13 V Zener reference for DAC calibration and offset trimming circuits. Use Value: ±5% tolerance and low 19 Ω ZZ enable sub-0.1% measurement repeatability across instrument lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4743A-TP (Micro Commercial) | Same 13 V nominal VZ, ±5% tolerance, DO-41 package, but specified with 20 Ω max ZZ (vs. 19 Ω typ for 1N4743A-T50A) and 1.0 W rating at 75 °C ambient (not lead temp) | Used in cost-sensitive consumer power adapters where tighter thermal spec is not required | Select when sourcing flexibility is prioritized and thermal derating profile aligns with board layout constraints |
| BZX55C13 (Vishay) | 13 V Zener, ±5%, DO-35 package (smaller than DO-41), 500 mW power rating, higher ZZ (30 Ω max), and narrower operating temperature range (–65 °C to +175 °C) | Suitable for space-constrained PCBs with lower power demands and less extreme thermal environments | Choose only if footprint reduction is critical and 500 mW dissipation suffices for the target current range |
Compared with 1N4743A-TP and BZX55C13, the 1N4743A-T50A offers superior thermal robustness (200 °C max TJ), tighter typical ZZ, and lead-temperature–based power rating-making it preferred for industrial-grade reliability where sustained 1 W operation and wide ambient extremes matter.
Availability
1N4743A-T50A is available at Aetrix Electronics and suitable for industrial power supply regulation, automotive ECU reference voltage generation, and programmable logic controller I/O protection requiring stable component supply and long-term manufacturability.
Supply support for 1N4743A-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, sensors, and logic devices for automotive, industrial, communications, and computing markets.
The 1N47xxA series was developed specifically for general-purpose, high-reliability Zener voltage regulation in power conversion, protection, and reference circuits-emphasizing thermal stability, tight tolerance, and rugged packaging.
FAQ
What is the nominal Zener voltage of the 1N4743A-T50A?
The 1N4743A-T50A has a nominal Zener voltage of 13.0 V, specified at a test current of 25 mA. Its guaranteed range is 12.35 V to 13.65 V (±5% tolerance) at 25 °C, per ON Semiconductor's 1N4728A–1N4758A datasheet Rev. 8. This value is measured under thermal equilibrium conditions with 3/8″ lead length and lead temperature at 30 °C ± 1 °C.
What is the maximum power dissipation rating for the 1N4743A-T50A?
The 1N4743A-T50A is rated for 1.0 W continuous power dissipation at lead temperature (TL) ≤ 50 °C. Above 50 °C, it must be derated linearly at 6.67 mW/°C. This rating assumes 3/8″ lead length and is distinct from ambient-temperature–based ratings used by some alternate manufacturers.
Does the 1N4743A-T50A have a specified Zener impedance?
Yes, the 1N4743A-T50A has a typical Zener impedance (ZZ) of 19 Ω at IZ = 25 mA, with no maximum limit specified. This low dynamic impedance contributes to stable regulation under varying load conditions and is confirmed in the Electrical Characteristics table of the official ON Semiconductor datasheet.
What is the operating temperature range of the 1N4743A-T50A?
The 1N4743A-T50A supports an operating and storage temperature range of –65 °C to +200 °C. This wide junction temperature range is explicitly stated in the Absolute Maximum Ratings section and makes the device suitable for under-hood automotive, industrial motor drives, and high-temperature power supply applications.
How is the cathode identified on the 1N4743A-T50A package?
The cathode of the 1N4743A-T50A is marked by a single black band on the DO-41 glass axial package. Per ON Semiconductor's Top Mark Information guidelines, this band denotes the cathode terminal, and the device must be reverse-biased (cathode positive relative to anode) to achieve Zener regulation.
1N4743A-T50A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 13 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 10 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 9.9 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
1N4743A-T50A FAQ
1.How can I place an order for 1N4743A-T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4743A-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 1N4743A-T50A reliable?
The price and inventory of 1N4743A-T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4743A-T50A is usually 5 days.
3.What payment methods are accepted for 1N4743A-T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4743A-T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4743A-T50A?
1N4743A-T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4743A-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 1N4743A-T50A?
For technical support, including 1N4743A-T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4743A-T50A requirements.
6.How does Aetrix verify that 1N4743A-T50A is sourced from the original manufacturer or authorized distributors?
All 1N4743A-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 1N4743A-T50A meets industry standards.
7.What is the process for return or replacement of 1N4743A-T50A?
All 1N4743A-T50A units undergo pre-shipment inspection (PSI). If there is an issue with 1N4743A-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 1N4743A-T50A part is unused and in its original packaging.
Return procedure for 1N4743A-T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4743A-T50A Tags
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