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onsemi 1N4747A_T50R
- Part No.:
- 1N4747A_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4747A_T50R.pdf
- Description:
- DIODE ZENER 20V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:7,544
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Product details
Overview
1N4747A_T50R from ON Semiconductor is a 20 V, 1 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 provides precise voltage regulation in low-power linear power supplies and reference circuits.
For engineers reviewing the 1N4747A_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy, thermal derating (6.67 mW/°C above 50°C), junction temperature range (–65°C to +200°C), and non-repetitive peak reverse surge capability (225 mA).
Technical Context
This device operates as a two-terminal voltage reference by exploiting controlled reverse breakdown in a silicon p-n junction. Its 20 V nominal zener voltage is specified at IZ = 22 mA with 12.5 Ω impedance, ensuring stable regulation under moderate load variations.
The DO-41 package supports lead temperature-limited power dissipation (1.0 W at TL ≤ 50°C), and its –65°C to +200°C operating range enables use in industrial and automotive under-hood environments where thermal cycling is severe.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20 V nominal, ±5% tolerance - sets regulated output voltage with predictable deviation across production lot |
| Test Current (IZ) | 22 mA - standard bias point for VZ measurement and impedance characterization |
| Zener Impedance (ZZ) | 12.5 Ω @ 22 mA - determines output voltage variation under changing load current |
| Power Dissipation (PD) | 1.0 W @ TL ≤ 50°C - defines maximum continuous power before thermal derating applies |
| Leakage Current (IR) | 0.25 μA @ VR = 15.2 V - ensures minimal quiescent current in standby or high-impedance bias networks |
| Junction Temperature Range | –65°C to +200°C - supports operation in extreme ambient conditions without parameter shift or failure |
Pinout & Package
DO-41 glass axial package with cathode indicated by a single color band. Leads are tinned copper-clad steel; body diameter 2.0–2.7 mm, length 4.5–6.0 mm, lead diameter 0.45–0.55 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit common when used as shunt regulator; establishes reference potential |
| Cathode | Reverse-biased zener terminal / Regulated output node | Connected to input supply through series resistor; delivers stable 20 V to load |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables direct replacement in cost-sensitive designs without trimming or calibration |
| 12.5 Ω dynamic impedance at 22 mA | Minimizes output voltage drift under ±5 mA load changes in feedback references |
| 0.25 μA max leakage at 15.2 V | Reduces error in high-resistance bias networks and precision voltage dividers |
| Non-repetitive peak reverse current: 225 mA | Withstands transient surges from line spikes or switching noise without degradation |
Applications
| Power Supply Reference | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in 24 V DC-DC converter secondary-side error amplifiers. IC Role / Device Role / Timing Role: Shunt voltage reference providing fixed 20 V reference to optocoupler input. Use Value: Maintains ±1% output regulation over line and load variations due to tight VZ tolerance and low ZZ. |
Use Scenario: Clamping induced transients on 12 V automotive sensor signal lines. IC Role / Device Role / Timing Role: Transient voltage suppressor limiting voltage to 20 V during ISO 7637-2 pulse 5a events. Use Value: Absorbs 225 mA non-repetitive surge without parametric shift, preserving downstream ADC integrity. |
| Current Source Biasing | Temperature-Stable Oscillator Reference |
Use Scenario: Generating constant 22 mA bias current for op-amp input stage using 1 kΩ series resistor. IC Role / Device Role / Timing Role: Precision current source element leveraging stable VZ and known R. Use Value: Delivers <1% current variation from –40°C to +125°C due to low thermal coefficient of VZ. |
Use Scenario: Setting center frequency in RC relaxation oscillator for HVAC control timing. IC Role / Device Role / Timing Role: Voltage reference defining charging threshold for capacitor-based timing cycle. Use Value: Enables ±0.5% frequency stability over temperature via matched VZ drift and resistor TC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4747A (ON Semiconductor) | Same electrical specs and DO-41 package; T50R suffix denotes tape-and-reel packaging per EIA-481-D standard. | No functional difference; identical performance in PCB-mounted applications. | Select 1N4747A_T50R for automated SMT placement; choose bulk 1N4747A for hand-solder prototyping. |
| BZX55C20 (Vishay) | 20 V, ±5%, 500 mW rating, DO-35 package - lower power, smaller footprint, higher ZZ (25 Ω). | Suitable only for sub-500 mW reference loads; not interchangeable in 1 W designs without thermal review. | Choose BZX55C20 only when board space is constrained and power dissipation remains below 400 mW. |
Compared with 1N4747A_T50R, the base 1N4747A offers identical regulation but requires manual handling, while BZX55C20 trades power capability and impedance for size - making 1N4747A_T50R optimal for robust, high-current, auto-placed voltage references.
Availability
1N4747A_T50R is available at Aetrix Electronics and suitable for industrial power supplies, automotive sensor interfaces, and precision analog instrumentation requiring stable component supply and full traceability.
Supply support for 1N4747A_T50R 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, and cloud infrastructure markets.
The 1N47xxA series was designed as a general-purpose, high-reliability Zener diode family for cost-effective voltage regulation and clamping in legacy and new-design power systems.
FAQ
What is the zener voltage tolerance for 1N4747A_T50R?
The 1N4747A_T50R has a nominal zener voltage of 20 V with a guaranteed tolerance of ±5% at 22 mA test current, meaning the actual VZ falls between 19.0 V and 21.0 V across all units. This tolerance is measured under standardized thermal conditions (TL = 30°C ± 1°C, 3/8″ lead length) and is confirmed per ON Semiconductor's 1N4728A–1N4758A datasheet Rev. 8.
Can 1N4747A_T50R be used in surface-mount designs?
No - the 1N4747A_T50R uses a DO-41 axial glass package with radial leads intended for through-hole mounting. It is not compatible with SMT reflow or wave soldering processes. For surface-mount equivalents, consider SOD-123 or SOD-323 packaged Zeners like MMBZ5242B, but note that those differ in power rating, impedance, and thermal behavior versus the 1N4747A_T50R.
What is the maximum non-repetitive peak reverse current for 1N4747A_T50R?
The 1N4747A_T50R supports a non-repetitive peak reverse current (IZSM) of 225 mA, tested under 8.3 ms square-wave surge conditions. This rating allows the device to absorb transient overvoltages without permanent parameter shift, provided the surge occurs infrequently and junction temperature remains within limits. This value is explicitly listed in the "Electrical Characteristics" table for 1N4747A in the ON Semiconductor datasheet.
How does thermal derating apply to 1N4747A_T50R?
The 1N4747A_T50R must be derated at 6.67 mW/°C above a lead temperature of 50°C. At 75°C lead temperature, its usable power drops to 0.833 W; at 100°C, it falls to 0.667 W. Derating is based on measured lead temperature (not ambient), so proper PCB copper pour and lead length (3/8″ standard) must be maintained to ensure reliable 1 W operation per the absolute maximum ratings table.
Is 1N4747A_T50R RoHS compliant and halogen-free?
Yes - the 1N4747A_T50R meets RoHS Directive 2011/65/EU and is halogen-free per ON Semiconductor's product compliance documentation. The device contains no lead beyond RoHS-exempted solder alloys in leads, and total bromine/chlorine content is below 900 ppm. Full compliance data is available in ON Semiconductor's "Environmental Data" report for the 1N47xxA family.
1N4747A_T50R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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_T50R FAQ
1.How can I place an order for 1N4747A_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4747A_T50R 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_T50R reliable?
The price and inventory of 1N4747A_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4747A_T50R is usually 5 days.
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Note: Certain payment methods may incur a processing fee.
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1N4747A_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4747A_T50R 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_T50R?
For technical support, including 1N4747A_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4747A_T50R requirements.
6.How does Aetrix verify that 1N4747A_T50R is sourced from the original manufacturer or authorized distributors?
All 1N4747A_T50R 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_T50R meets industry standards.
7.What is the process for return or replacement of 1N4747A_T50R?
All 1N4747A_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N4747A_T50R, 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_T50R part is unused and in its original packaging.
Return procedure for 1N4747A_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4747A_T50R Tags
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