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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

onsemi 1N4731A_T50R

Name: 1N4731A_T50R
Brand: onsemi
SKU: 1N4731A_T50R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N4731A_T50R

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: DO-204AL, DO-41, Axial

Datasheet:: 1N4731A_T50R.pdf

Description:: DIODE ZENER 4.3V 1W DO41

Quantity:: RFQ Add To RFQ list

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Inventory:6,255

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Product details

Overview

1N4731A_T50R from ON Semiconductor is a 4.3 V ±5% Zener diode in DO-41 glass package, rated for 1.0 W power dissipation at TL ≤ 50°C, with 58 Ω dynamic impedance at 9 mA test current and 1 μA leakage at 3.4 V reverse voltage. It provides stable voltage reference in low-power regulator and protection circuits.

For engineers reviewing the 1N4731A_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage (4.3 V), tolerance (±5%), power rating (1.0 W), Zener impedance (58 Ω @ 9 mA), and DO-41 package compatibility with through-hole PCB layouts.

Technical Context

This device operates as a silicon planar Zener diode optimized for voltage regulation and overvoltage clamping in DC bias networks. Its 4.3 V nominal breakdown voltage is specified at 9 mA test current, with guaranteed min/max V_Z of 4.085 V / 4.515 V and thermal stability across –65°C to +200°C operating range.

The 1N4731A_T50R exhibits 58 Ω dynamic impedance (Z_Z) at I_Z = 9 mA and 400 Ω knee impedance (Z_ZK) at I_ZK = 1 mA, supporting predictable regulation under varying load conditions. Its non-repetitive peak reverse surge current is rated at 1070 mA for 8.3 ms square-wave pulses.

Key Specifications

Parameter	Value and Actual Design Meaning
V_Z Nominal	4.3 V - Stable reverse breakdown voltage at 9 mA, enabling precise low-voltage reference generation
V_Z Tolerance	±5% - Ensures production yield within 4.085–4.515 V, suitable for cost-sensitive regulation without trimming
P_D	1.0 W @ TL ≤ 50°C - Supports continuous operation up to 1 W with 3/8″ lead length; derates 6.67 mW/°C above 50°C
Z_Z @ I_Z	58 Ω @ 9 mA - Low dynamic impedance ensures minimal output voltage variation under load transients
I_R @ V_R	1 μA @ 3.4 V - Ultra-low leakage preserves battery life in standby circuits and high-impedance sensing nodes
T_J/T_STG	–65°C to +200°C - Wide temperature range supports automotive under-hood and industrial control environments

Pinout & Package

DO-41 glass axial package with cathode band marking; leads are unmarked anode/cathode terminals. Standard through-hole mounting with 0.40" (10.16 mm) lead spacing and 2.0 mm body diameter.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal	Connected to lower potential node; enables forward bias operation below 0.7 V
Cathode	Zener breakdown terminal	Connected to higher potential node; reverse-biased to achieve 4.3 V regulated output

Key Features

Feature	Design Value
Stable Zener voltage	4.3 V ±5% at 9 mA - Enables accurate voltage referencing without external calibration
Low dynamic impedance	58 Ω @ 9 mA - Minimizes regulation error during load current changes
High surge capability	1070 mA non-repetitive peak reverse current - Withstands transient overvoltage events per 8.3 ms waveform
Wide temperature range	–65°C to +200°C operation - Suitable for extreme-environment applications including engine control units

Applications

Power Supply Reference	Overvoltage Clamp
Use Scenario: Providing stable 4.3 V reference for linear regulators or op-amp biasing in low-power embedded systems. IC Role / Device Role / Timing Role: Voltage reference element establishing fixed DC bias point for analog circuitry. Use Value: Delivers ±5% accuracy without trimming, reducing BOM count and calibration steps in production.	Use Scenario: Clamping input voltage to protect microcontroller GPIOs from ESD or inductive kickback. IC Role / Device Role / Timing Role: Transient voltage suppressor limiting reverse voltage to 4.515 V maximum. Use Value: Prevents latch-up or oxide damage by clamping spikes below IC absolute maximum ratings.
Current Source Bias	Signal Level Shifting
Use Scenario: Generating constant current for LED biasing or sensor excitation using resistor-Zener configuration. IC Role / Device Role / Timing Role: Voltage-defined current source node in two-terminal active bias network. Use Value: Maintains stable current despite supply variation due to tight 58 Ω Z_Z and low tempco.	Use Scenario: Shifting logic signal levels between 5 V and 3.3 V domains using Zener-based level translator. IC Role / Device Role / Timing Role: Threshold clamp defining logic-high threshold at 4.3 V for interfacing legacy peripherals. Use Value: Enables reliable interface without dedicated level-shifter ICs, reducing board area and cost.

Power Supply Reference

Overvoltage Clamp

Use Scenario: Providing stable 4.3 V reference for linear regulators or op-amp biasing in low-power embedded systems.

IC Role / Device Role / Timing Role: Voltage reference element establishing fixed DC bias point for analog circuitry.

Use Value: Delivers ±5% accuracy without trimming, reducing BOM count and calibration steps in production.

Use Scenario: Clamping input voltage to protect microcontroller GPIOs from ESD or inductive kickback.

IC Role / Device Role / Timing Role: Transient voltage suppressor limiting reverse voltage to 4.515 V maximum.

Use Value: Prevents latch-up or oxide damage by clamping spikes below IC absolute maximum ratings.

Current Source Bias

Signal Level Shifting

Use Scenario: Generating constant current for LED biasing or sensor excitation using resistor-Zener configuration.

IC Role / Device Role / Timing Role: Voltage-defined current source node in two-terminal active bias network.

Use Value: Maintains stable current despite supply variation due to tight 58 Ω Z_Z and low tempco.

Use Scenario: Shifting logic signal levels between 5 V and 3.3 V domains using Zener-based level translator.

IC Role / Device Role / Timing Role: Threshold clamp defining logic-high threshold at 4.3 V for interfacing legacy peripherals.

Use Value: Enables reliable interface without dedicated level-shifter ICs, reducing board area and cost.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener diode applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4731A (DO-41, no suffix)	Identical electrical specs and DO-41 package; T50R denotes tape-and-reel packaging variant	No functional difference; same thermal and electrical behavior in circuit	Select 1N4731A_T50R for automated SMT placement; use bulk 1N4731A for manual prototyping
BZX55-C4V3 (DO-35)	Same 4.3 V ±5%, but DO-35 glass package (smaller size, 0.5 W rating)	Lower power handling (0.5 W vs. 1.0 W); unsuitable for >500 mW continuous dissipation	Choose BZX55-C4V3 only when space-constrained and power < 300 mW; verify thermal margin

Compared with 1N4731A_T50R, the base 1N4731A offers identical performance in bulk form, while BZX55-C4V3 trades power capability for smaller footprint-making the T50R variant optimal for high-reliability, medium-power through-hole regulation where tape-and-reel automation is required.

Availability

1N4731A_T50R is available at Aetrix Electronics and suitable for power supply reference, overvoltage clamp, and current source bias applications requiring stable component supply, consistent Zener voltage tolerance, and DO-41 mechanical compatibility.

Supply support for 1N4731A_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 electronics, with leadership in power management, analog, sensors, and discrete devices.

The 1N47xxA series was designed for general-purpose voltage regulation and protection in cost-sensitive industrial, consumer, and automotive auxiliary circuits-emphasizing reliability, wide temperature operation, and standardized DO-41 compatibility.

FAQ

What is the nominal Zener voltage of the 1N4731A_T50R?

The 1N4731A_T50R has a nominal Zener voltage of 4.3 V, with a guaranteed range of 4.085 V to 4.515 V at 9 mA test current and ±5% tolerance. This value is measured under thermal equilibrium at lead temperature of 30°C ± 1°C with 3/8″ lead length, as defined in the ON Semiconductor datasheet 1N4736AT/D Rev. 8.

What package type does the 1N4731A_T50R use?

The 1N4731A_T50R uses the DO-41 glass axial package with cathode band marking, featuring 0.40" lead spacing and 2.0 mm body diameter. The "_T50R" suffix indicates tape-and-reel packaging for automated assembly, while the underlying device remains mechanically and electrically identical to standard DO-41 variants of the 1N4731A.

What is the maximum power dissipation rating for the 1N4731A_T50R?

The 1N4731A_T50R is rated for 1.0 W power dissipation at lead temperature (T_L) ≤ 50°C with 3/8″ lead length. Above 50°C, it derates linearly at 6.67 mW/°C. This rating assumes proper PCB thermal relief and ambient conditions compliant with ON Semiconductor's Absolute Maximum Ratings table in document 1N4736AT/D.

How does the 1N4731A_T50R compare to the BZX55-C4V3 in terms of power handling?

The 1N4731A_T50R supports 1.0 W continuous dissipation, whereas the BZX55-C4V3 is rated for 0.5 W in its smaller DO-35 package. This makes the 1N4731A_T50R suitable for higher-power regulation tasks like 5 V rail clamping or 10 mA reference sources, while the BZX55-C4V3 is limited to low-power signal-level applications where thermal margin is constrained.

What is the Zener impedance of the 1N4731A_T50R at its test current?

The 1N4731A_T50R has a dynamic Zener impedance (Z_Z) of 58 Ω at its specified test current of 9 mA. This value reflects small-signal AC resistance near the breakdown knee and directly impacts regulation accuracy under varying load conditions-lower Z_Z yields tighter voltage stability across current changes.

1N4731A_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):: 4.3 V

Tolerance:: ±5%

Power - Max:: 1 W

Impedance (Max) (Zzt):: 9 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

1N4731A_T50R FAQ

1.How can I place an order for 1N4731A_T50R through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N4731A_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 1N4731A_T50R reliable?

The price and inventory of 1N4731A_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4731A_T50R is usually 5 days.

3.What payment methods are accepted for 1N4731A_T50R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4731A_T50R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N4731A_T50R?

1N4731A_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N4731A_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 1N4731A_T50R?

For technical support, including 1N4731A_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4731A_T50R requirements.

6.How does Aetrix verify that 1N4731A_T50R is sourced from the original manufacturer or authorized distributors?

All 1N4731A_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 1N4731A_T50R meets industry standards.

7.What is the process for return or replacement of 1N4731A_T50R?

All 1N4731A_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N4731A_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 1N4731A_T50R part is unused and in its original packaging.

Return procedure for 1N4731A_T50R:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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