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Taiwan Semiconductor Corporation 1N4739G
- Part No.:
- 1N4739G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4739G.pdf
- Description:
- DIODE ZENER 9.1V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:9,673
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Product details
Overview
1N4739G 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; features hermetically sealed construction, 53.5°C/W junction-to-lead thermal resistance, and 0.5 mA knee test current.
For engineers reviewing the 1N4739G datasheet, 1N4739G pinout, 1N4739G application, or 1N4739G equivalent, key selection criteria include Zener voltage tolerance, power dissipation limit, thermal resistance, leakage current at 7 V, and DO-41 mechanical compatibility with through-hole PCB layouts.
Technical Context
The 1N4739G operates as a single-die, silicon planar Zener diode with sharp reverse breakdown at 9.1 V under 28 mA test current (IZT), exhibiting 5 Ω dynamic impedance (ZZT) and 700 Ω knee impedance (ZZK) at 0.5 mA. Its hermetic glass encapsulation ensures stable long-term voltage reference performance across industrial temperature ranges.
Designed for unidirectional voltage clamping and regulation, it supports continuous DC operation up to 200°C junction temperature, with 100°C/W junction-to-ambient thermal resistance limiting usable power in still-air environments without heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V nominal ±5% - defines precise regulation point for feedback loops or reference rails |
| Power Dissipation (PD) | 1 W - maximum continuous DC power before thermal runaway at TA = 25°C |
| Test Current (IZT) | 28 mA - operating point where VZ and ZZT are specified; sets minimum bias requirement |
| Zener Impedance (ZZT) | 5 Ω - low dynamic resistance ensures minimal output voltage variation under load changes |
| Knee Impedance (ZZK) | 700 Ω - impedance near breakdown threshold; impacts low-current regulation fidelity |
| Leakage Current (IR) | 10 µA at VR = 7 V - confirms effective blocking below regulation threshold |
| Junction Temperature (TJ) | -65°C to +200°C - enables use in automotive under-hood or industrial high-temp environments |
Pinout & Package
DO-41 axial-leaded glass package with cathode band marking; pure tin-plated leads compliant with J-STD-002 solderability standard; weight ≈242 mg.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage side | Connected to circuit ground or lower potential node in reverse-biased regulation configuration |
| Cathode | Zener breakdown terminal / regulated output side | Marked by colored band; connects to input rail to maintain stable 9.1 V drop across load |
Key Features
| Feature | Design Value |
|---|---|
| Hermetically sealed glass case | Prevents moisture ingress and parameter drift over time-critical for long-life voltage references |
| ±5% Zener voltage tolerance | Enables predictable regulation without post-manufacture trimming in cost-sensitive applications |
| Junction-to-lead thermal resistance (RθJL) | 53.5°C/W - allows direct heat transfer to PCB copper pour or lead frame for improved power handling |
| RoHS-compliant construction | Meets global environmental compliance requirements without sacrificing electrical performance |
| DO-41 mechanical standardization | Ensures compatibility with legacy automated insertion equipment and hand-soldering workflows |
Applications
| Low-Voltage Stabilizers | On-Board DC/DC Converters |
|---|---|
Use Scenario: Providing stable 9.1 V bias for op-amp comparators in battery-powered sensor nodes. IC Role / Device Role: Voltage reference element establishing fixed threshold for analog signal conditioning. Use Value: Maintains <±0.46 V regulation error across temperature and load, enabling consistent trip-point accuracy. |
Use Scenario: Output voltage feedback reference in isolated flyback converters delivering 9–12 V outputs. IC Role / Device Role: Precision shunt reference connected to optocoupler input for secondary-side regulation. Use Value: Delivers stable 9.1 V reference with <10 µA leakage, minimizing standby power loss in no-load conditions. |
| Lighting Applications | Adapters |
Use Scenario: Overvoltage protection and current-limiting reference in LED driver IC feedback paths. IC Role / Device Role: Clamping reference that triggers foldback during transient surges on 12 V supply rails. Use Value: Responds within microseconds at 9.1 V, preventing LED string damage without adding active components. |
Use Scenario: Input voltage stabilization in wall-mounted AC/DC adapters powering consumer electronics. IC Role / Device Role: Pre-regulator shunt maintaining constant intermediate bus voltage before linear regulator stage. Use Value: Absorbs up to 1 W of excess energy while holding voltage within ±5%, improving adapter efficiency and thermal margin. |
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; differs only in manufacturer (ON Semiconductor) and JEDEC registration | Identical functional role; validated in same adapter and DC/DC reference designs | Drop-in replacement if sourcing flexibility required; verify date code and lot traceability per OEM policy |
| BZX55C9V1 | 9.1 V ±5%, 500 mW rating, DO-35 package - lower power and smaller footprint | Suitable only for sub-500 mW reference loads; not recommended for 1 W sustained dissipation | Select when board space is constrained and thermal budget permits reduced power handling |
Compared with 1N4739A and BZX55C9V1, the 1N4739G offers full 1 W dissipation in DO-41 with proven thermal robustness, making it preferred for industrial adapters and DC/DC converters where reliability under sustained load matters most.
Availability
1N4739G is available at Aetrix Electronics and suitable for low-voltage stabilizers, on-board DC/DC converters, and lighting applications requiring stable component supply with RoHS compliance and industrial temperature range support.
Supply support for 1N4739G 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 with global distribution and AEC-Q200 qualified lines.
The 1N47xxG series was developed to deliver high-reliability, glass-encapsulated Zener references for industrial power supplies and automotive auxiliary systems where long-term stability and hermetic sealing are mandatory.
FAQ
What is the Zener voltage tolerance of the 1N4739G?
The 1N4739G 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 and 25°C ambient temperature. This tolerance is confirmed in the Electrical Specifications table of the Taiwan Semiconductor datasheet revision G2301.
Can the 1N4739G be used in surface-mount designs?
No, the 1N4739G is packaged in the through-hole DO-41 axial lead format and is not compatible with SMT assembly processes. It requires plated-through holes and wave or hand soldering. For surface-mount equivalents, consider SOD-123 or SOD-323 packaged Zeners like BZT52-B9V1, but note their lower 500 mW rating.
What is the maximum junction temperature for the 1N4739G?
The 1N4739G supports a junction temperature range of -65°C to +200°C, as specified in the Absolute Maximum Ratings table. This wide range enables operation in harsh environments such as automotive engine compartments or industrial control cabinets without derating below 1 W until ambient exceeds ~100°C.
How does the 1N4739G compare to the 1N4739A?
The 1N4739G and 1N4739A share identical electrical specifications-including 9.1 V Zener voltage, ±5% tolerance, 1 W power rating, and DO-41 package-but differ in manufacturer (Taiwan Semiconductor vs. ON Semiconductor) and minor process-level qualifications. Both are functionally interchangeable in existing designs.
Is the 1N4739G RoHS compliant?
Yes, the 1N4739G is explicitly marked RoHS compliant in the Features section of the Taiwan Semiconductor datasheet (Version G2301). It contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits, and uses green compound encapsulation.
1N4739G 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AL (DO-41)
1N4739G FAQ
1.How can I place an order for 1N4739G through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4739G 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 reliable?
The price and inventory of 1N4739G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4739G is usually 5 days.
3.What payment methods are accepted for 1N4739G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4739G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4739G?
1N4739G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4739G 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?
For technical support, including 1N4739G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4739G requirements.
6.How does Aetrix verify that 1N4739G is sourced from the original manufacturer or authorized distributors?
All 1N4739G 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 meets industry standards.
7.What is the process for return or replacement of 1N4739G?
All 1N4739G units undergo pre-shipment inspection (PSI). If there is an issue with 1N4739G, 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 part is unused and in its original packaging.
Return procedure for 1N4739G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4739G Tags
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