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onsemi 1N4748A_T50R
- Part No.:
- 1N4748A_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4748A_T50R.pdf
- Description:
- DIODE ZENER 22V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:7,663
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Product details
Overview
1N4748A_T50R from ON Semiconductor is a 22 V, 1 W axial-leaded Zener diode in DO-41 glass package, rated for ±5% tolerance, 11.5 Ω dynamic impedance at 19 mA test current, and 0.25 μA leakage at 16.7 V reverse voltage. It regulates voltage in low-power DC supplies, reference circuits, and overvoltage protection for microcontroller I/O lines.
For engineers reviewing the 1N4748A_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy (22 V ±5%), power derating above 50°C (6.67 mW/°C), thermal stability (−65°C to +200°C), and DO-41 mechanical compatibility with through-hole PCB layouts.
Technical Context
This device operates as a silicon planar Zener diode optimized for stable voltage regulation in linear power supplies and precision biasing networks. Its 22 V nominal breakdown voltage is specified at 19 mA test current, with 11.5 Ω dynamic impedance (ZZ) ensuring minimal output variation under load changes.
The 1N4748A_T50R exhibits low leakage (≤0.25 μA at VR = 16.7 V), supports non-repetitive peak reverse surge up to 205 mA, and maintains operation across −65°C to +200°C junction temperature range-enabling use in industrial and automotive ambient environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22 V ±5% at IZ = 19 mA - defines precise regulation point for feedback loops and reference generation |
| Power Dissipation (PD) | 1.0 W @ TL ≤ 50°C, 3/8″ lead length - sets maximum continuous power handling in standard mounting |
| Zener Impedance (ZZ) | 11.5 Ω @ IZ = 19 mA - determines output voltage deviation under varying load current |
| Leakage Current (IR) | ≤0.25 μA @ VR = 16.7 V - ensures minimal quiescent current in high-impedance bias networks |
| Operating Temperature | −65°C to +200°C - enables deployment in extended-temperature industrial and under-hood automotive applications |
| Thermal Derating | 6.67 mW/°C above 50°C - guides heatsinking requirements for sustained operation at elevated ambient |
Pinout & Package
DO-41 glass axial package with cathode indicated by color band; two-terminal device requiring no orientation-specific PCB footprint beyond standard 0.4" lead spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node when used in reverse-biased regulation configuration |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input supply; delivers stable 22 V to load when reverse biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables predictable regulation without post-manufacture trimming in cost-sensitive consumer and industrial designs |
| 1 W power rating with defined derating curve | Supports robust transient handling in unregulated DC adapters and battery-backed systems |
| Low 0.25 μA leakage at 16.7 V | Minimizes error in high-resistance voltage divider references and low-power sensor biasing |
| DO-41 glass package with axial leads | Ensures compatibility with legacy wave-solder and hand-solder assembly processes and automated tape-and-reel feeding |
| −65°C to +200°C operating range | Validates use in engine control units, industrial PLCs, and outdoor power electronics without derating penalties |
Applications
| DC Power Supply Regulation | Microcontroller I/O Protection |
|---|---|
Use Scenario: Stabilizing unregulated 24 V rail to generate clean 22 V reference for analog front-end circuitry. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to clamp and regulate output voltage. Use Value: Delivers stable 22 V ±5% with 11.5 Ω dynamic impedance, reducing ripple sensitivity compared to higher-Z alternatives. |
Use Scenario: Clamping 3.3 V or 5 V MCU GPIO pins against ESD or overvoltage transients from external sensors. IC Role / Device Role / Timing Role: Passive voltage limiter placed between I/O line and ground to shunt excess energy. Use Value: Low 0.25 μA leakage preserves signal integrity; 205 mA non-repetitive surge rating absorbs typical HBM ESD events. |
| Precision Voltage Reference | Industrial Sensor Biasing |
Use Scenario: Providing excitation voltage for resistive bridge sensors (e.g., strain gauges) in weigh-scale modules. IC Role / Device Role / Timing Role: Stable DC reference source in ratiometric measurement chains. Use Value: Tight 5% tolerance and low tempco (implied by −65°C to +200°C range) maintain measurement accuracy across environmental extremes. |
Use Scenario: Biasing thermistor or RTD interface circuits in HVAC controllers and process monitoring equipment. IC Role / Device Role / Timing Role: Fixed-voltage source establishing known current through sensing element. Use Value: 1 W rating accommodates long-duration bias currents; DO-41 package allows easy replacement during field maintenance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4748A (no suffix) | Same electrical specs; identical DO-41 package; differs only in packaging format (T50R = tape-and-reel, standard part = bulk or ammo pack) | No functional difference; suitable for same PCB layouts and thermal environments | Select 1N4748A_T50R for automated SMT placement; choose bulk-packaged 1N4748A for manual or wave-solder assembly |
| BZX55C22 | 22 V ±5%, 500 mW rating, DO-35 package - lower power, smaller footprint, higher thermal resistance | Not recommended for 1 W continuous loads; limited to low-current references and signal clamping | Choose BZX55C22 only when board space is constrained and power dissipation remains below 500 mW |
Compared with 1N4748A_T50R, the unsuffixed 1N4748A offers identical performance in alternate packaging, while BZX55C22 trades 500 mW power capability and DO-35 size for reduced thermal margin-making it unsuitable for sustained 1 W operation but viable for compact, low-power biasing.
Availability
1N4748A_T50R is available at Aetrix Electronics and suitable for DC power supply regulation, microcontroller I/O protection, and precision voltage reference applications requiring stable component supply, consistent parametric performance, and long-term manufacturability.
Supply support for 1N4748A_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 power management, analog, sensor, and logic devices for automotive, industrial, and consumer markets.
The 1N47xxA series was designed as a general-purpose, high-reliability Zener diode family for voltage regulation and reference applications in cost-sensitive, high-volume electronics.
FAQ
What is the Zener voltage tolerance of the 1N4748A_T50R?
The 1N4748A_T50R has a Zener voltage tolerance of ±5% at 22 V nominal, measured at 19 mA test current and 25°C ambient. This tolerance is guaranteed per ON Semiconductor's 1N4728A–1N4758A datasheet Rev. 8, and applies directly to the 1N4748A_T50R as a tape-and-reel variant of the base 1N4748A device.
Can the 1N4748A_T50R be used in surface-mount designs?
No-the 1N4748A_T50R uses a DO-41 axial glass package with 0.4" lead spacing, intended for through-hole mounting. It is not compatible with SMT reflow or pick-and-place processes. For surface-mount equivalents, consider SOD-123 or SOD-323 packaged Zeners like MMBZ5242B, but note these differ in power rating and regulation characteristics from the 1N4748A_T50R.
What is the maximum non-repetitive peak reverse current for the 1N4748A_T50R?
The 1N4748A_T50R supports a non-repetitive peak reverse current (IZSM) of 205 mA, specified for an 8.3 ms square-wave surge per ON Semiconductor's datasheet. This rating enables the 1N4748A_T50R to absorb transient overvoltages in power supply inputs and I/O protection circuits without degradation.
How does thermal derating apply to the 1N4748A_T50R?
The 1N4748A_T50R must be derated at 6.67 mW/°C above a lead temperature of 50°C. For example, at 100°C lead temperature, its usable power drops to 0.667 W. This linear derating curve is defined in the Absolute Maximum Ratings table and applies directly to the 1N4748A_T50R due to its DO-41 package construction and thermal path.
Is the 1N4748A_T50R RoHS compliant?
Yes-the 1N4748A_T50R meets RoHS Directive 2011/65/EU requirements as confirmed by ON Semiconductor's official compliance documentation. The device contains no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE), and is marked accordingly on packaging and datasheets for the 1N47xxA family.
1N4748A_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):
- 22 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 23 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 16.7 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
1N4748A_T50R FAQ
1.How can I place an order for 1N4748A_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4748A_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 1N4748A_T50R reliable?
The price and inventory of 1N4748A_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4748A_T50R is usually 5 days.
3.What payment methods are accepted for 1N4748A_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4748A_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4748A_T50R?
1N4748A_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4748A_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 1N4748A_T50R?
For technical support, including 1N4748A_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4748A_T50R requirements.
6.How does Aetrix verify that 1N4748A_T50R is sourced from the original manufacturer or authorized distributors?
All 1N4748A_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 1N4748A_T50R meets industry standards.
7.What is the process for return or replacement of 1N4748A_T50R?
All 1N4748A_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N4748A_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 1N4748A_T50R part is unused and in its original packaging.
Return procedure for 1N4748A_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4748A_T50R Tags
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