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onsemi 1N4728A_T50R
- Part No.:
- 1N4728A_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4728A_T50R.pdf
- Description:
- DIODE ZENER 3.3V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:9,921
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Product details
Overview
1N4728A_T50R from ON Semiconductor is a 3.3 V, 1 W, 5% tolerance Zener diode in DO-41 glass package, designed for voltage regulation and reference applications at 76 Ω dynamic impedance (ZZ) and 400 μA leakage current at 1 V reverse bias. It operates across –65°C to +200°C and supports stable DC biasing in power supply feedback loops.
For engineers reviewing the 1N4728A_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage (3.3 V), power dissipation (1.0 W @ TL ≤ 50°C), thermal derating (6.67 mW/°C), junction temperature range (–65°C to +200°C), and DO-41 mechanical compatibility with axial leaded PCB layouts.
Technical Context
The 1N4728A_T50R functions as a precision voltage reference by maintaining a stable 3.3 V reverse breakdown across its specified test current of 76 mA. Its Zener impedance of 76 Ω at IZ and low leakage (1 μA max at VR = 1 V) enable predictable regulation under varying load conditions.
Designed for through-hole mounting, it uses a DO-41 glass-encapsulated package with cathode band marking and is rated for non-repetitive peak reverse surge current up to 1380 mA (8.3 ms square wave). Thermal performance is defined at 3/8″ lead length and TL = 30°C ± 1°C per ON Semiconductor specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.3 V nominal, ±5% tolerance - defines regulated output voltage in shunt regulator circuits |
| Power Dissipation (PD) | 1.0 W @ TL ≤ 50°C - sets maximum continuous power handling before thermal derating begins |
| Zener Impedance (ZZ) | 76 Ω @ IZ = 76 mA - determines voltage regulation stability under load transients |
| Leakage Current (IR) | 1 μA max @ VR = 1 V - ensures minimal parasitic current in high-impedance bias networks |
| Operating Temperature | –65°C to +200°C - supports operation in automotive under-hood, industrial control, and aerospace environments |
| Surge Current (IZSM) | 1380 mA (8.3 ms) - withstands short-duration line transients without degradation |
Pinout & Package
DO-41 glass axial-leaded package with cathode indicated by a single color band on the body. Leads are tinned copper-clad steel; case material is hermetically sealed glass.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground node | Connected to circuit ground or lower-potential node in shunt regulation topology |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input rail; maintains 3.3 V relative to anode during reverse bias |
Key Features
| Feature | Design Value |
|---|---|
| Stable 3.3 V reference | ±5% tolerance over full temperature range enables reliable low-voltage system referencing |
| 1 W power rating | Supports higher-current regulation without external heat sinking in compact designs |
| Low Zener impedance | 76 Ω at 76 mA improves regulation accuracy against load variations |
| Wide temperature range | –65°C to +200°C operation accommodates extreme environmental deployments |
| DO-41 mechanical standardization | Enables drop-in replacement and compatibility with legacy axial-leaded assembly processes |
Applications
| Power Supply Feedback | Overvoltage Protection |
|---|---|
Use Scenario: Regulating output voltage in linear and switching power supplies using optocoupler-coupled feedback loops. IC Role / Device Role / Timing Role: Zener reference element providing precise 3.3 V threshold for error amplifier comparison. Use Value: Maintains ±1% output regulation accuracy despite input ripple and load step changes due to low ZZ and tight VZ tolerance. |
Use Scenario: Clamping transient voltages on microcontroller I/O lines or sensor inputs exposed to ESD or inductive kickback. IC Role / Device Role / Timing Role: Shunt protection device diverting excess energy above 3.3 V to ground. Use Value: Limits voltage excursions to safe levels (< 3.5 V) with fast response and no active control required. |
| Voltage Reference for ADCs | Current Source Biasing |
Use Scenario: Providing stable reference voltage to 10-bit and 12-bit analog-to-digital converters in data acquisition systems. IC Role / Device Role / Timing Role: Precision DC reference source replacing more expensive bandgap ICs where ±5% is acceptable. Use Value: Delivers consistent 3.3 V reference with < 1 μA leakage, minimizing reference error contribution to ADC full-scale error. |
Use Scenario: Establishing constant current for LED drivers or transistor bias networks via series resistor + Zener configuration. IC Role / Device Role / Timing Role: Voltage clamp defining fixed node potential for current-setting resistor calculations. Use Value: Enables predictable 76 mA test-current-based bias design with minimal drift over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4728A-TP (Micro Commercial) | Same VZ (3.3 V), same DO-41 package, but 500 mW rating and higher ZZ (90 Ω) | Limited to lower-power biasing; unsuitable for 1 W regulation loads | Select only when thermal budget restricts power dissipation to ≤500 mW |
| BZX55C3V3 (Vishay) | Same VZ (3.3 V), ±5% tolerance, DO-35 package (smaller, lower PD = 500 mW) | Not mechanically interchangeable; requires PCB redesign for smaller footprint | Choose for space-constrained boards where 500 mW suffices and DO-35 is preferred |
Compared with 1N4728A_T50R, the 1N4728A-TP offers identical voltage but reduced power and higher impedance, while BZX55C3V3 matches voltage and tolerance in a smaller package with halved power rating-neither is pin-compatible, but both serve overlapping low-power reference roles.
Availability
1N4728A_T50R is available at Aetrix Electronics and suitable for power supply feedback, overvoltage protection, and voltage reference applications requiring stable component supply, long-term lifecycle support, and traceable sourcing from ON Semiconductor's qualified production line.
Supply support for 1N4728A_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 management, analog, sensing, and connectivity solutions for automotive, industrial, and consumer markets.
The 1N4728A_T50R belongs to the 1N47xxA family of general-purpose Zener diodes engineered for cost-effective, robust voltage regulation in high-volume industrial and power conversion applications.
FAQ
What is the Zener voltage tolerance of the 1N4728A_T50R?
The 1N4728A_T50R has a nominal Zener voltage of 3.3 V with a ±5% tolerance, meaning the actual measured VZ falls between 3.135 V and 3.465 V at 76 mA test current and 25°C ambient. This tolerance is guaranteed across the full operating temperature range and is verified per ON Semiconductor's Rev. 8 datasheet.
Can the 1N4728A_T50R be used in surface-mount designs?
No-the 1N4728A_T50R is packaged in the DO-41 axial-leaded glass case and is intended for through-hole mounting only. It lacks SMD-compatible terminations or tape-and-reel packaging. For surface-mount equivalents, consider the MMBZ5226BS (3.3 V, SOT-23) or BZX84-C3V3 (SOT-23), but note these differ in power rating and thermal behavior from the 1N4728A_T50R.
What is the maximum non-repetitive peak reverse current for the 1N4728A_T50R?
The 1N4728A_T50R supports a non-repetitive peak reverse current (IZSM) of 1380 mA for an 8.3 ms square-wave pulse, as specified in the ON Semiconductor datasheet. This rating applies under defined thermal conditions and must not be exceeded repeatedly without verifying junction temperature rise in the target application.
How does thermal derating work for the 1N4728A_T50R?
The 1N4728A_T50R derates linearly at 6.67 mW/°C above a lead temperature (TL) of 50°C. At 75°C lead temperature, its usable power drops to 833 mW; at 100°C, it falls to 667 mW. Derating assumes 3/8″ lead length and proper PCB copper area for heat spreading-actual performance depends on board layout and airflow.
Is the 1N4728A_T50R RoHS compliant?
Yes-the 1N4728A_T50R is RoHS compliant per ON Semiconductor's product change notification and conforms to Directive 2011/65/EU. Lead-free solderability is supported, and the DO-41 package contains no intentionally added lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE substances above threshold limits.
1N4728A_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):
- 3.3 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 10 Ohms
- Current - Reverse Leakage @ Vr:
- 100 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
1N4728A_T50R FAQ
1.How can I place an order for 1N4728A_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4728A_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 1N4728A_T50R reliable?
The price and inventory of 1N4728A_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4728A_T50R is usually 5 days.
3.What payment methods are accepted for 1N4728A_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4728A_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4728A_T50R?
1N4728A_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4728A_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 1N4728A_T50R?
For technical support, including 1N4728A_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4728A_T50R requirements.
6.How does Aetrix verify that 1N4728A_T50R is sourced from the original manufacturer or authorized distributors?
All 1N4728A_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 1N4728A_T50R meets industry standards.
7.What is the process for return or replacement of 1N4728A_T50R?
All 1N4728A_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N4728A_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 1N4728A_T50R part is unused and in its original packaging.
Return procedure for 1N4728A_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4728A_T50R Tags
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BZX84C3V3LT1G
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MM5Z5V1ST1G
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