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onsemi 1N4733A-T50A
- Part No.:
- 1N4733A-T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4733A-T50A.pdf
- Description:
- DIODE ZENER 5.1V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:574
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Product details
Overview
1N4733A-T50A from ON Semiconductor is a 5.1 V, 1 W Zener diode in DO-41 glass package, rated for ±5% tolerance, 49 Ω dynamic impedance at 45 mA test current, and operating from –65°C to +200°C. It regulates voltage in low-power reference and protection circuits, such as power supply feedback loops and overvoltage clamp stages.
For engineers reviewing the 1N4733A-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 (890 mA), and DO-41 mechanical compatibility with through-hole PCB layouts.
Technical Context
The 1N4733A-T50A operates as a silicon planar Zener diode optimized for stable voltage regulation under DC reverse bias. Its 5.1 V nominal breakdown voltage is specified at 45 mA test current, with typical dynamic impedance of 49 Ω and knee impedance of 7 Ω at 1 mA, ensuring predictable clamping behavior across load and temperature variations.
It features a maximum leakage current of 10 µA at 3.8 V reverse bias and supports non-repetitive peak reverse surge currents up to 890 mA (8.3 ms square wave), making it suitable for transient suppression in low-energy analog and digital supply rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.1 V ±5% at 45 mA - defines precise DC regulation point for feedback or reference use |
| Power Dissipation (PD) | 1.0 W @ TL ≤ 50°C - sets maximum continuous DC power handling in standard lead configuration |
| Zener Impedance (ZZ) | 49 Ω @ 45 mA - determines output voltage variation under changing load current |
| Knee Impedance (ZZK) | 7 Ω @ 1 mA - indicates low-current regulation stability near turn-on threshold |
| Leakage Current (IR) | 10 µA @ 3.8 V - ensures minimal parasitic current draw below breakdown |
| Operating Temperature | –65°C to +200°C - enables deployment in automotive under-hood, industrial, and aerospace environments |
| Surge Current (IZSM) | 890 mA (8.3 ms) - provides short-duration transient energy absorption without failure |
Pinout & Package
DO-41 glass axial package with cathode band marking; leads are unmarked anode and banded cathode terminals. Standard 3/8″ lead length used for thermal rating definition.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection | Connected to circuit ground or lower potential node during Zener operation |
| Cathode | Zener breakdown terminal / high-side connection | Connected to regulated voltage rail or input source; marked with color band |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables tight regulation without external trimming in cost-sensitive references |
| 1 W power rating with 6.67 mW/°C derating | Supports robust thermal management in compact PCB layouts with defined lead length |
| Low knee impedance (7 Ω @ 1 mA) | Ensures stable regulation even at light loads typical in sensor biasing or microcontroller reset circuits |
| High surge current rating (890 mA) | Provides inherent transient immunity in unfiltered DC rails without added TVS devices |
| Wide temperature range (–65°C to +200°C) | Validates use in extreme-environment applications including engine control and downhole electronics |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Used in the optocoupler feedback path of isolated AC/DC flyback converters to stabilize output voltage. IC Role / Device Role: Precision voltage reference establishing error amplifier setpoint. Use Value: 5.1 V ±5% tolerance and 49 Ω impedance ensure <±1% output regulation across line/load/temperature. | Use Scenario: Placed across microcontroller I/O pins or ADC inputs to limit transient-induced damage. IC Role / Device Role: Passive clamping element diverting ESD or inductive kick energy to ground. Use Value: 890 mA non-repetitive surge rating absorbs 8.3 ms transients without degradation, complementing system-level protection. |
| Sensor Biasing Circuit | Microcontroller Reset Generator |
Use Scenario: Supplies stable bias voltage to analog sensors (e.g., pressure transducers) requiring low-noise excitation. IC Role / Device Role: Low-drift DC reference source decoupled from noisy main supply rails. Use Value: 10 µA leakage at 3.8 V minimizes loading error; DO-41 package allows easy placement near sensor module. | Use Scenario: Integrated into RC-based reset circuits to define precise reset threshold for 3.3 V or 5 V MCUs. IC Role / Device Role: Threshold-setting element triggering POR or brown-out detection. Use Value: Sharp 5.1 V breakdown with 7 Ω knee impedance ensures clean, repeatable reset assertion across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4733A-TP (Micro Commercial) | Same 5.1 V ±5%, DO-41, but rated for 1.0 W @ TL = 75°C (vs. 50°C); 55 Ω ZZ @ 45 mA | Higher thermal threshold allows simpler heatsinking in ambient >50°C environments | Select when board-level ambient exceeds 50°C and lead-length thermal constraints differ |
| BZX55-C5V1 (Vishay) | Same 5.1 V ±5%, DO-35, 500 mW rating, 60 Ω ZZ @ 5 mA - lower power, smaller package | Not interchangeable in 1 W designs; requires layout change due to DO-35 footprint | Choose only for space-constrained, sub-500 mW applications where DO-41 is not required |
Compared with 1N4733A-T50A, the 1N4733A-TP offers higher thermal operating margin but slightly higher impedance, while BZX55-C5V1 trades power and package size for reduced footprint-neither is pin-compatible, and both require validation for power dissipation and surge handling in the target design.
Availability
1N4733A-T50A is available at Aetrix Electronics and suitable for power supply feedback reference, overvoltage clamp protection, and microcontroller reset generator applications requiring stable component supply and long-term manufacturability.
Supply support for 1N4733A-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 is part of ON Semiconductor's legacy Zener diode portfolio designed for general-purpose voltage regulation and protection in cost-sensitive, high-reliability through-hole applications.
FAQ
What is the Zener voltage tolerance for 1N4733A-T50A?
The 1N4733A-T50A has a Zener voltage tolerance of ±5% around its nominal 5.1 V rating, measured at 45 mA test current and 25°C. This means the actual breakdown voltage falls between 4.845 V and 5.355 V under specified conditions. The tolerance is guaranteed per ON Semiconductor's 1N4728A–1N4758A datasheet Rev. 8, and applies directly to the 1N4733A-T50A variant.
Does 1N4733A-T50A support surge current events?
Yes, the 1N4733A-T50A supports non-repetitive peak reverse surge current up to 890 mA for an 8.3 ms square wave pulse, as specified in the Absolute Maximum Ratings table. This capability allows the 1N4733A-T50A to absorb transient energy in unprotected DC lines without failure, provided duty cycle and repetition rate remain within non-repetitive limits defined in the datasheet.
What is the thermal derating behavior of 1N4733A-T50A?
The 1N4733A-T50A derates linearly at 6.67 mW/°C above a lead temperature of 50°C, based on 3/8″ lead length. At 75°C lead temperature, its usable power drops to approximately 833 mW. This derating must be applied when calculating safe operating area in real-world PCB layouts, especially with limited copper pour or elevated ambient temperatures.
Is 1N4733A-T50A compatible with automated through-hole assembly?
Yes, the 1N4733A-T50A uses the industry-standard DO-41 axial package with 0.40" (10.16 mm) lead spacing and 0.030" (0.76 mm) diameter leads, fully compatible with standard wave soldering and selective soldering equipment. Its glass body and cathode band marking are machine-readable for AOI inspection, supporting high-yield automated manufacturing.
How does the knee impedance of 1N4733A-T50A affect low-current regulation?
The 1N4733A-T50A exhibits a knee impedance (ZZK) of 7 Ω at 1 mA, indicating strong regulation capability even near the onset of breakdown. This low knee impedance ensures minimal voltage deviation (<7 mV per 1 mA change) in low-power applications like sensor biasing or MCU reset circuits, where operating currents often fall below 10 mA.
1N4733A-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):
- 5.1 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 7 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
1N4733A-T50A FAQ
1.How can I place an order for 1N4733A-T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4733A-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 1N4733A-T50A reliable?
The price and inventory of 1N4733A-T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4733A-T50A is usually 5 days.
3.What payment methods are accepted for 1N4733A-T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4733A-T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4733A-T50A?
1N4733A-T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4733A-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 1N4733A-T50A?
For technical support, including 1N4733A-T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4733A-T50A requirements.
6.How does Aetrix verify that 1N4733A-T50A is sourced from the original manufacturer or authorized distributors?
All 1N4733A-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 1N4733A-T50A meets industry standards.
7.What is the process for return or replacement of 1N4733A-T50A?
All 1N4733A-T50A units undergo pre-shipment inspection (PSI). If there is an issue with 1N4733A-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 1N4733A-T50A part is unused and in its original packaging.
Return procedure for 1N4733A-T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4733A-T50A Tags
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