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onsemi 1N4748A-T50A
- Part No.:
- 1N4748A-T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4748A-T50A.pdf
- Description:
- DIODE ZENER 22V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:6,388
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Product details
Overview
1N4748A-T50A from ON Semiconductor is a 22 V, 1 W Zener diode in DO-41 glass package, rated for ±5% tolerance, 11.5 Ω dynamic impedance at 19 mA test current, and operating across –65 °C to +200 °C. It provides precise voltage regulation in low-power DC reference and overvoltage protection circuits, such as power supply feedback loops and sensor biasing networks.
For engineers reviewing the 1N4748A-T50A datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy, thermal derating (6.67 mW/°C above 50 °C), peak reverse surge capability (205 mA non-repetitive), leakage current ≤5 µA at 16.7 V, and DO-41 mechanical compatibility with through-hole PCB layouts.
Technical Context
The 1N4748A-T50A operates as a two-terminal, silicon planar Zener diode optimized for stable reverse-biased breakdown regulation. Its design centers on controlled avalanche breakdown at 22 V nominal, with tight 5% tolerance and low dynamic impedance (11.5 Ω @ 19 mA) ensuring minimal output voltage variation under load changes.
Thermal performance is defined by a 1.0 W power dissipation limit at lead temperature ≤50 °C and linear derating beyond that point. The device supports high-reliability operation across –65 °C to +200 °C junction and storage range, making it suitable for industrial and automotive under-hood environments where thermal cycling is severe.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22 V nominal, min 20.9 V / max 23.1 V - defines regulated output voltage under specified test conditions |
| Test Current (IZ) | 19 mA - current at which VZ is measured and impedance is characterized |
| Zener Impedance (ZZ) | 11.5 Ω @ IZ - low dynamic resistance ensures stable regulation against load transients |
| Power Dissipation (PD) | 1.0 W @ TL ≤ 50 °C - maximum continuous power before thermal derating begins |
| Leakage Current (IR) | ≤5 µA @ VR = 16.7 V - guarantees minimal error current in high-impedance reference paths |
| Non-Repetitive Peak Reverse Current (IZSM) | 205 mA @ 8.3 ms - surge rating for transient overvoltage clamping without failure |
| Operating Temperature Range | –65 °C to +200 °C - enables use in extreme ambient environments without parameter drift |
Pinout & Package
DO-41 glass axial package with cathode band marking; leads are unmarked anode/cathode terminals - no internal circuitry or control pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower potential side in reverse-bias configuration; carries full load current during regulation |
| Cathode | Zener breakdown terminal | Marked with color band; connected to higher potential side; defines regulated output node in shunt topology |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Ensures predictable regulation without post-production trimming in cost-sensitive designs |
| Low dynamic impedance (11.5 Ω) | Maintains <±0.2 V output deviation across 5–25 mA load current range |
| 1.0 W power rating with linear derating | Supports robust thermal management using standard 3/8″ lead length and PCB copper pour |
| –65 °C to +200 °C operating range | Eliminates need for derating or external thermal protection in wide-temperature deployments |
| Non-repetitive 205 mA surge rating | Clamps ESD and line transients per IEC 61000-4-5 Level 3 without degradation |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp Protection |
|---|---|
|
Use Scenario: Stabilizing output voltage in linear regulator feedback networks and SMPS optocoupler biasing. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 22 V threshold for error amplifier comparison. Use Value: Tight 5% VZ tolerance and low ZZ reduce output ripple and improve load regulation to ±1.2%. |
Use Scenario: Protecting microcontroller I/O pins and analog front-ends from 24 V rail surges. IC Role / Device Role / Timing Role: Passive clamp limiting voltage to 23.1 V during transients exceeding normal operating range. Use Value: 205 mA non-repetitive surge rating absorbs 8.3 ms spikes without parametric shift or failure. |
| Sensor Biasing Network | Industrial Signal Conditioning |
|
Use Scenario: Providing stable excitation voltage for resistive temperature detectors (RTDs) and strain gauges. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source replacing precision IC references in 2-wire configurations. Use Value: Leakage current ≤5 µA prevents measurement error in high-impedance bridge arms (>100 kΩ). |
Use Scenario: Level-shifting and clamping 0–20 mA loop signals in PLC analog input modules. IC Role / Device Role / Timing Role: Bidirectional voltage limiter defining safe signal swing boundaries for op-amp inputs. Use Value: –65 °C to +200 °C rating allows direct mounting on DIN-rail enclosures exposed to ambient extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4748A-TP (Micro Commercial Co.) | Same 22 V nominal VZ, ±5% tolerance, DO-41 package, but 12 Ω ZZ @ 19 mA and 210 mA IZSM | Identical functional role; slightly higher surge rating suits higher-energy transient environments | Select when enhanced surge margin is required and minor ZZ increase is acceptable |
| BZX55C22 (Vishay) | 22 V nominal, ±5%, DO-35 package, 15 Ω ZZ @ 5 mA, 1.3 W PD, 100 mA IZSM | Lower surge rating and different test current; smaller DO-35 footprint limits thermal mass | Choose only for space-constrained boards where 1.0 W continuous dissipation is not required |
Compared with 1N4748A-T50A, the 1N4748A-TP offers marginally improved surge handling while maintaining identical regulation specs, whereas BZX55C22 trades thermal robustness and surge capacity for compact size-making the original 1N4748A-T50A optimal for reliability-critical 1 W reference and clamp roles.
Availability
1N4748A-T50A is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface modules, and programmable logic controller (PLC) analog input stages requiring stable component supply and long-term manufacturability.
Supply support for 1N4748A-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 electronics, with leadership in power management, analog, sensors, and discrete devices.
The 1N47xxA series was designed specifically for general-purpose, high-reliability Zener voltage regulation in industrial, automotive, and computing power systems-emphasizing thermal stability, surge resilience, and tight parametric consistency.
FAQ
What is the Zener voltage tolerance of the 1N4748A-T50A?
1N4748A-T50A has a ±5% Zener voltage tolerance, meaning its breakdown voltage ranges from 20.9 V to 23.1 V at 19 mA test current and 25 °C. This tolerance is guaranteed across the full operating temperature range and is verified during production testing per ON Semiconductor's 1N4728A–1N4758A specification.
Can the 1N4748A-T50A be used in surface-mount designs?
No - the 1N4748A-T50A uses a DO-41 axial glass package with radial leads intended for through-hole mounting. It lacks SMD-compatible terminations or tape-and-reel packaging. For surface-mount equivalents, consider SOD-123 or SOD-323 packaged Zeners like MMBZ5242B, but note these differ in voltage, power, and thermal behavior from the 1N4748A-T50A.
What is the maximum allowable junction temperature for the 1N4748A-T50A?
The 1N4748A-T50A supports a maximum junction temperature of +200 °C, matching its storage temperature limit. This rating assumes proper lead length (3/8″) and PCB thermal relief. At ambient temperatures above 50 °C, power must be linearly derated at 6.67 mW/°C to maintain safe junction operation - a critical constraint when designing for enclosed or high-temperature environments.
How does the 1N4748A-T50A compare to the 1N4747A in terms of Zener impedance?
The 1N4748A-T50A has a Zener impedance of 11.5 Ω at 19 mA, while the 1N4747A (20 V nominal) specifies 12.5 Ω at 17 mA. Though both belong to the same family and share DO-41 packaging, the 1N4748A-T50A delivers marginally lower dynamic impedance - improving regulation stability in applications sensitive to load-induced voltage shifts, such as precision feedback loops.
Is the 1N4748A-T50A RoHS compliant and halogen-free?
Yes - the 1N4748A-T50A meets RoHS Directive 2011/65/EU and is halogen-free per ON Semiconductor's product compliance documentation (document number 1N4736AT/D, Rev. 8). The DO-41 glass package contains no lead in solderable finishes, and all materials comply with JEDEC J-STD-609A Class 1 requirements for bromine and chlorine content.
1N4748A-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):
- 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-T50A FAQ
1.How can I place an order for 1N4748A-T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4748A-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 1N4748A-T50A reliable?
The price and inventory of 1N4748A-T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4748A-T50A is usually 5 days.
3.What payment methods are accepted for 1N4748A-T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4748A-T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4748A-T50A?
1N4748A-T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4748A-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 1N4748A-T50A?
For technical support, including 1N4748A-T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4748A-T50A requirements.
6.How does Aetrix verify that 1N4748A-T50A is sourced from the original manufacturer or authorized distributors?
All 1N4748A-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 1N4748A-T50A meets industry standards.
7.What is the process for return or replacement of 1N4748A-T50A?
All 1N4748A-T50A units undergo pre-shipment inspection (PSI). If there is an issue with 1N4748A-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 1N4748A-T50A part is unused and in its original packaging.
Return procedure for 1N4748A-T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4748A-T50A Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZX84C3V3LT1G
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MMSZ4682T1G
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MM5Z5V1ST1G
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