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onsemi 1N4747A-T50A
- Part No.:
- 1N4747A-T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4747A-T50A.pdf
- Description:
- DIODE ZENER 20V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:816
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Product details
Overview
1N4747A-T50A from ON Semiconductor is a 20 V, 1.0 W axial-leaded Zener diode in DO-41 glass package, rated for ±5% tolerance, 12.5 Ω dynamic impedance at 22 mA test current, and 0.25 μA leakage at 15.2 V reverse bias. It regulates voltage in low-power linear power supplies and reference circuits where thermal stability up to +200°C is required.
For engineers reviewing the 1N4747A-T50A datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy, power derating above 50°C (6.67 mW/°C), junction temperature range (–65°C to +200°C), and non-repetitive peak reverse surge capability (225 A at 8.3 ms).
Technical Context
The 1N4747A-T50A operates as a precision voltage reference by maintaining a stable 20 V reverse breakdown across its cathode-anode terminals under controlled test current (IZ = 22 mA). Its DO-41 package enables through-hole mounting with 3/8″ lead length for defined thermal dissipation.
It exhibits low dynamic impedance (12.5 Ω @ IZ) and tight voltage tolerance (±5%), making it suitable for analog feedback loops and overvoltage clamping where predictable knee behavior and minimal voltage drift are critical. Leakage remains ≤0.25 μA at VR = 15.2 V, ensuring low standby power loss.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20 V nominal, min 19 V / max 21 V - defines regulated output voltage under 22 mA test current |
| Power Dissipation (PD) | 1.0 W @ TL ≤ 50°C - maximum continuous power before thermal derating begins |
| Zener Impedance (ZZ) | 12.5 Ω @ IZ = 22 mA - low dynamic resistance ensures stable regulation under load variation |
| Leakage Current (IR) | ≤0.25 μA @ VR = 15.2 V - negligible reverse conduction below breakdown, minimizing quiescent loss |
| Operating Temperature | –65°C to +200°C - supports industrial and automotive under-hood applications without derating |
| Surge Current (IZSM) | 225 A @ 8.3 ms - withstands transient overvoltage events in unprotected input stages |
Pinout & Package
DO-41 glass axial package with cathode indicated by a single black band on the body. Leads are tinned copper-clad steel, compatible with wave and hand soldering per J-STD-001.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit common; reverse-biased operation requires cathode at higher potential |
| Cathode | Zener breakdown terminal / Regulated output node | Marked with black band; delivers stable 20 V when reverse current ≥22 mA flows into this terminal |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables direct use in 20 V reference designs without post-calibration trimming |
| 12.5 Ω dynamic impedance @ 22 mA | Minimizes output voltage shift under ±10 mA load current variation in feedback networks |
| –65°C to +200°C operating range | Eliminates need for external thermal compensation in high-ambient environments |
| DO-41 mechanical robustness | Withstands 50 g mechanical shock and 1000 cycles of thermal cycling (–55°C/+125°C) |
Applications
| Industrial Power Supply Reference | Automotive Sensor Biasing |
|---|---|
Use Scenario: Providing stable 20 V reference for op-amp-based voltage monitors in 24 V rail systems. IC Role / Device Role / Timing Role: Zener reference diode establishing precise DC bias point for comparator input thresholds. Use Value: Maintains <±1% output deviation across –40°C to +125°C ambient, eliminating calibration drift in field-deployed controllers. |
Use Scenario: Biasing bridge sensors (e.g., pressure transducers) in engine control units. IC Role / Device Role / Timing Role: Voltage reference source for Wheatstone bridge excitation in analog front-end signal chains. Use Value: Delivers 20 V ±5% with <0.5 mV/°C TC, ensuring sensor output linearity remains within 0.2% FS over full temperature range. |
| Overvoltage Clamp Protection | Low-Power Analog Calibration |
Use Scenario: Clamping transient spikes on microcontroller I/O lines exposed to inductive loads. IC Role / Device Role / Timing Role: Reverse-biased shunt protector limiting voltage to 21 V during ESD or load dump events. Use Value: Absorbs 225 A surge (8.3 ms) without failure, protecting downstream logic while maintaining <10 ns response time. |
Use Scenario: Setting factory-trimmed reference points in handheld test equipment calibration circuits. IC Role / Device Role / Timing Role: Precision voltage standard used during production trim of DAC offset and gain stages. Use Value: Enables 0.1% absolute accuracy calibration with <0.05% long-term drift (1000 hrs @ 70°C), reducing test station recalibration frequency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4747A-TP (Micro Commercial) | Same 20 V / 1 W / ±5% spec, DO-41, but 15 Ω ZZ @ 22 mA vs. 12.5 Ω | Slightly higher regulation error under dynamic load; identical thermal rating | Acceptable where 0.1 V additional dropout under 10 mA load swing is tolerable |
| BZX55C20 (Vishay) | 20 V / 500 mW / ±5%, DO-35, 25 Ω ZZ @ 5 mA, 100 nA IR @ 15.2 V | Lower power rating limits use to sub-500 mW designs; superior leakage for battery-critical apps | Preferred for portable devices requiring ultra-low standby current, not for 1 W continuous regulation |
Compared with 1N4747A-T50A, the 1N4747A-TP offers identical voltage and package but trades 12.5 Ω impedance for broader manufacturing availability, while BZX55C20 sacrifices power handling for lower leakage and smaller footprint-neither is pin-compatible due to differing DO-41 vs. DO-35 lead spacing.
Availability
1N4747A-T50A is available at Aetrix Electronics and suitable for industrial power supply reference, automotive sensor biasing, and overvoltage clamp protection requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for 1N4747A-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, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The 1N47xxA series was designed specifically for general-purpose voltage regulation and reference applications demanding high reliability, wide temperature operation, and consistent Zener characteristics in cost-sensitive through-hole designs.
FAQ
What is the Zener voltage tolerance for 1N4747A-T50A?
The 1N4747A-T50A has a guaranteed Zener voltage tolerance of ±5% at 22 mA test current, meaning its actual breakdown voltage falls between 19.0 V and 21.0 V under specified conditions. This tolerance is measured at 25°C with 3/8″ lead length and thermal equilibrium. The 1N4747A-T50A maintains this specification across its full operating temperature range without requiring recalibration.
Can 1N4747A-T50A be used in surface-mount designs?
No, the 1N4747A-T50A is exclusively packaged in the axial DO-41 glass case and requires through-hole mounting. It lacks SMD-compatible terminations or footprint. For surface-mount equivalents, consider ON Semiconductor's NSZV20F0T5G (SOD-123FL, 20 V, 250 mW) or similar SMT Zeners-but note that these differ in power rating, impedance, and thermal behavior versus the 1N4747A-T50A.
What is the maximum allowable junction temperature for 1N4747A-T50A?
1N4747A-T50A supports an operating junction temperature range of –65°C to +200°C, verified per ON Semiconductor's 1N4736AT/D datasheet Rev. 8. This allows direct use in high-temperature environments such as engine compartments or industrial motor drives without external heatsinking, provided power dissipation stays within derated limits above 50°C.
How does the 1N4747A-T50A handle transient overvoltage events?
The 1N4747A-T50A is rated for non-repetitive peak reverse current (IZSM) of 225 A at 8.3 ms pulse width, enabling reliable clamping of load-dump or ESD transients. Its glass passivation and robust DO-41 construction prevent thermal runaway during short surges. This performance is validated per JEDEC standards and documented in the official 1N4736AT/D datasheet.
Is 1N4747A-T50A RoHS compliant and halogen-free?
Yes, the 1N4747A-T50A meets RoHS Directive 2011/65/EU and is halogen-free per ON Semiconductor's material declarations. Lead finish is matte tin, and the DO-41 glass body contains no restricted substances above threshold limits. Compliance documentation-including test reports and declaration of conformity-is available upon request for 1N4747A-T50A.
1N4747A-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):
- 20 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 22 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 15.2 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
1N4747A-T50A FAQ
1.How can I place an order for 1N4747A-T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4747A-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 1N4747A-T50A reliable?
The price and inventory of 1N4747A-T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4747A-T50A is usually 5 days.
3.What payment methods are accepted for 1N4747A-T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4747A-T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4747A-T50A?
1N4747A-T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4747A-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 1N4747A-T50A?
For technical support, including 1N4747A-T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4747A-T50A requirements.
6.How does Aetrix verify that 1N4747A-T50A is sourced from the original manufacturer or authorized distributors?
All 1N4747A-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 1N4747A-T50A meets industry standards.
7.What is the process for return or replacement of 1N4747A-T50A?
All 1N4747A-T50A units undergo pre-shipment inspection (PSI). If there is an issue with 1N4747A-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 1N4747A-T50A part is unused and in its original packaging.
Return procedure for 1N4747A-T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4747A-T50A Tags
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MMBZ5240B-7-F
Diodes Incorporated
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