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

Taiwan Semiconductor Corporation 1N4739G R0G

Name: 1N4739G R0G
Brand: Taiwan Semiconductor Corporation
SKU: 1N4739G R0G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N4739G R0G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Zener Diodes

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

Datasheet:: 1N4739G R0G.pdf

Description:: DIODE ZENER 9.1V 1W DO204AL

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Product details

Overview

1N4739G R0G from Taiwan Semiconductor is a 1 W, 9.1 V ±5% Zener diode in DO-41 glass package, designed for precision voltage regulation and reference in low-power DC circuits, with 5 Ω maximum Zener impedance at 28 mA test current and 0.5 mA knee current specification.

For engineers reviewing the 1N4739G R0G datasheet, 1N4739G R0G pinout, 1N4739G R0G application, or 1N4739G R0G equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (R_θJL = 53.5°C/W), junction temperature range (–65°C to +200°C), and DO-41 lead-form compatibility for through-hole PCB assembly.

Technical Context

This discrete Zener diode operates in reverse breakdown to maintain stable 9.1 V across its terminals under regulated current conditions. It features hermetically sealed glass construction, pure tin-plated leads compliant with J-STD-002, and a cathode band for polarity identification.

Its electrical behavior is defined by three critical operating points: nominal Zener voltage (9.1 V) at 28 mA test current (I_ZT), 5 Ω dynamic impedance (Z_ZT) at I_ZT, and 700 Ω impedance (Z_ZK) at 0.5 mA knee current (I_ZK), enabling predictable performance in low-current reference and stabilization roles.

Key Specifications

Parameter	Value and Actual Design Meaning
V_Z	9.1 V nominal ±5% - ensures stable reference within ±0.455 V at 28 mA
P_D	1 W - limits continuous power dissipation to avoid thermal runaway in ambient ≤75°C
I_ZT	28 mA - required test current to achieve specified V_Z and Z_ZT
Z_ZT	5 Ω max - defines small-signal AC impedance for low-noise voltage reference stability
T_J Range	–65°C to +200°C - supports operation in automotive under-hood and industrial environments
R_θJL	53.5°C/W - enables thermal design with lead-to-board heat path in DO-41 mounting

Pinout & Package

DO-41 axial-leaded glass package with cathode indicated by a single black band; leads are pure tin-plated and solderable per J-STD-002.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / low-voltage side in reverse-bias operation	Connected to circuit ground or lower potential node when used as shunt regulator
Cathode	Zener breakdown terminal / high-voltage side in reverse-bias operation	Connected to input supply rail; voltage drop across device stabilizes at 9.1 V relative to anode

Key Features

Feature	Design Value
Hermetically sealed glass case	Prevents moisture ingress and long-term parameter drift in humid environments
±5% V_Z tolerance	Reduces need for post-assembly trimming in cost-sensitive voltage reference designs
DO-41 mechanical standardization	Ensures compatibility with legacy wave-solder and hand-solder tooling across manufacturing lines
Junction temperature up to +200°C	Supports reliable operation in enclosed enclosures without forced airflow or heatsinking

Applications

Low-Voltage Stabilizer	On-Board DC/DC Converter
Use Scenario: Regulating 9.1 V rail for microcontroller reset circuitry or analog sensor biasing in battery-powered IoT nodes. IC Role / Device Role: Shunt voltage regulator providing precise, low-current reference independent of load variation. Use Value: Maintains 9.1 V ±0.455 V over –40°C to +85°C ambient using only 28 mA I_ZT, minimizing quiescent power draw.	Use Scenario: Providing feedback reference for isolated flyback or buck converter secondary-side regulation. IC Role / Device Role: Voltage reference element in optocoupler feedback loop or TL431 auxiliary reference path. Use Value: Enables stable 9.1 V threshold detection with 5 Ω Z_ZT, reducing output ripple sensitivity in closed-loop control.
Lighting Application	Adapter Circuit
Use Scenario: Overvoltage clamp for LED driver IC inputs in constant-current streetlight modules. IC Role / Device Role: Transient voltage suppressor and steady-state voltage limiter protecting driver logic pins. Use Value: Clamps transients above 9.56 V (V_Z + 5%) while sustaining 1 W peak power without degradation.	Use Scenario: Output voltage reference in linear wall adapter supplying 9 V logic rails for consumer audio devices. IC Role / Device Role: Precision shunt reference setting regulated output via series pass transistor base drive. Use Value: Delivers 9.1 V ±5% accuracy with <10 µA leakage at 7 V, ensuring tight line/load regulation.

Low-Voltage Stabilizer

On-Board DC/DC Converter

Use Scenario: Regulating 9.1 V rail for microcontroller reset circuitry or analog sensor biasing in battery-powered IoT nodes.

IC Role / Device Role: Shunt voltage regulator providing precise, low-current reference independent of load variation.

Use Value: Maintains 9.1 V ±0.455 V over –40°C to +85°C ambient using only 28 mA I_ZT, minimizing quiescent power draw.

Use Scenario: Providing feedback reference for isolated flyback or buck converter secondary-side regulation.

IC Role / Device Role: Voltage reference element in optocoupler feedback loop or TL431 auxiliary reference path.

Use Value: Enables stable 9.1 V threshold detection with 5 Ω Z_ZT, reducing output ripple sensitivity in closed-loop control.

Lighting Application

Adapter Circuit

Use Scenario: Overvoltage clamp for LED driver IC inputs in constant-current streetlight modules.

IC Role / Device Role: Transient voltage suppressor and steady-state voltage limiter protecting driver logic pins.

Use Value: Clamps transients above 9.56 V (V_Z + 5%) while sustaining 1 W peak power without degradation.

Use Scenario: Output voltage reference in linear wall adapter supplying 9 V logic rails for consumer audio devices.

IC Role / Device Role: Precision shunt reference setting regulated output via series pass transistor base drive.

Use Value: Delivers 9.1 V ±5% accuracy with <10 µA leakage at 7 V, ensuring tight line/load regulation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4739A	Same 9.1 V rating and DO-41 package; ±5% tolerance; identical Z_ZT and I_ZT; RoHS-compliant but non-hermetic epoxy package	Limited to lower-humidity environments due to absence of hermetic seal	Select 1N4739A where cost and RoHS compliance outweigh long-term stability in harsh conditions
BZX55C9V1	9.1 V ±5%, DO-35 package, 500 mW rating, higher Z_ZT (10 Ω), lower I_ZT (5 mA)	Not suitable for 1 W continuous dissipation; requires derating above 70°C ambient	Choose BZX55C9V1 only for space-constrained, low-power reference use with <500 mW thermal budget

Compared with 1N4739A and BZX55C9V1, the 1N4739G R0G delivers superior thermal robustness (1 W / +200°C) and hermetic reliability for industrial and automotive-grade voltage references where long-term parametric stability is critical.

Availability

1N4739G R0G is available at Aetrix Electronics and suitable for low-voltage stabilizers, on-board DC/DC converters, lighting applications, and adapter circuits requiring stable component supply with full traceability and volume scalability.

Supply support for 1N4739G R0G 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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, rectifiers, and Zener diodes for industrial and consumer applications.

The 1N47xxG series was developed to deliver high-reliability, hermetically sealed Zener references with tight voltage tolerance and extended temperature capability for mission-critical stabilization tasks.

FAQ

What is the Zener voltage and tolerance of the 1N4739G R0G?

The 1N4739G R0G has a nominal Zener voltage of 9.1 V with a standard tolerance of ±5%, meaning its actual breakdown voltage falls between 8.645 V and 9.555 V at 28 mA test current. This tolerance is confirmed in the Electrical Specifications table and applies across the full operating temperature range.

What package type and lead finish does the 1N4739G R0G use?

The 1N4739G R0G uses the DO-41 axial-leaded glass package with pure tin-plated leads that meet J-STD-002 solderability requirements. The cathode is marked by a single black band, and the device weighs approximately 242 mg.

What is the maximum power dissipation and thermal resistance of the 1N4739G R0G?

The 1N4739G R0G has a maximum power dissipation (P_D) of 1 W at 25°C ambient, with junction-to-lead thermal resistance (R_θJL) of 53.5°C/W and junction-to-ambient (R_θJA) of 100°C/W. Derating is required above 25°C per the absolute maximum ratings table.

How does the 1N4739G R0G perform at low test currents?

At the knee current (I_ZK) of 0.5 mA, the 1N4739G R0G exhibits a Zener impedance (Z_ZK) of 700 Ω and maintains regulation down to 7 V, enabling usable reference behavior even in ultra-low-power standby modes where current is tightly constrained.

Is the 1N4739G R0G RoHS compliant and hermetically sealed?

Yes, the 1N4739G R0G is RoHS compliant and features a hermetically sealed glass package, distinguishing it from epoxy-packaged alternatives like the 1N4739A. This construction prevents moisture-induced parameter shift and supports long-term stability in demanding environments.

1N4739G R0G Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 9.1 V

Tolerance:: ±5%

Power - Max:: 1 W

Impedance (Max) (Zzt):: 5 Ohms

Current - Reverse Leakage @ Vr:: 10 µA @ 7 V

Voltage - Forward (Vf) (Max) @ If:: 1.2 V @ 200 mA

Operating Temperature:: -65°C ~ 200°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-204AL (DO-41)

1N4739G R0G FAQ

1.How can I place an order for 1N4739G R0G through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N4739G R0G 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 1N4739G R0G reliable?

The price and inventory of 1N4739G R0G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4739G R0G is usually 5 days.

3.What payment methods are accepted for 1N4739G R0G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4739G R0G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N4739G R0G?

1N4739G R0G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N4739G R0G 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 1N4739G R0G?

For technical support, including 1N4739G R0G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4739G R0G requirements.

6.How does Aetrix verify that 1N4739G R0G is sourced from the original manufacturer or authorized distributors?

All 1N4739G R0G 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 1N4739G R0G meets industry standards.

7.What is the process for return or replacement of 1N4739G R0G?

All 1N4739G R0G units undergo pre-shipment inspection (PSI). If there is an issue with 1N4739G R0G, 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 1N4739G R0G part is unused and in its original packaging.

Return procedure for 1N4739G R0G:

1.Submit a request within 90 days.

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

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