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Taiwan Semiconductor Corporation 1N4757G
- Part No.:
- 1N4757G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4757G.pdf
- Description:
- DIODE ZENER 51V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:7,169
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Product details
Overview
1N4757G from Taiwan Semiconductor is a 1 W, 51 V ±5% Zener diode in DO-41 glass package, designed for precision voltage regulation and reference applications with 95 Ω dynamic impedance at 5 mA test current and 5 µA leakage at 38.8 V reverse bias. It operates across -65°C to +200°C junction temperature range and serves in DC/DC converter feedback networks.
For engineers reviewing the 1N4757G datasheet, 1N4757G pinout, 1N4757G application, or 1N4757G equivalent, key selection criteria include its 51 V nominal Zener voltage, ±5% tolerance, 1 W power dissipation, DO-41 mechanical compatibility, and thermal resistance of 100°C/W (junction-to-ambient).
Technical Context
The 1N4757G functions as a single-die, hermetically sealed silicon Zener diode optimized for stable reverse-bias breakdown operation. Its 51 V nominal Zener voltage is specified at 5 mA test current (IZT), with 95 Ω Zener impedance (ZZT) measured under AC superposition conditions per JEDEC standards.
It exhibits 5 µA maximum leakage current (IR) at 38.8 V (VR = 0.76 × VZ), operates within a -65°C to +200°C junction temperature envelope, and delivers thermal performance characterized by RθJA = 100°C/W and RθJL = 53.5°C/W - critical for board-level thermal design in compact power supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VZ Nominal | 51 V - precise reverse breakdown voltage at 5 mA, enabling accurate voltage reference in feedback loops |
| Tolerance | ±5% - ensures predictable clamping or regulation within 48.45–53.55 V at 25°C |
| Power Rating | 1 W - defines maximum continuous dissipation without derating; requires heatsinking above ~65°C ambient |
| Zener Impedance | 95 Ω at IZT = 5 mA - low dynamic resistance improves regulation stability under varying load currents |
| Leakage Current | 5 µA max at VR = 38.8 V - minimal off-state conduction preserves efficiency in standby or high-impedance bias networks |
| Junction Temp | -65°C to +200°C - supports operation in automotive under-hood, industrial, and lighting environments |
| Package | DO-41 - axial-leaded, glass-encapsulated, RoHS-compliant package with tin-plated leads per J-STD-002 |
Pinout & Package
DO-41 package: axial leaded, hermetically sealed glass body, cathode indicated by painted band; leads are pure tin-plated and solderable per J-STD-002. Weight ≈ 242 mg.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage side in reverse-bias regulation | Connected to ground or lower-potential node when used as shunt regulator |
| Cathode | Zener breakdown terminal / high-voltage side in reverse-bias regulation | Connected to input or regulated rail; cathode band marks this terminal for correct PCB orientation |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass seal | Prevents moisture ingress and long-term parameter drift in humid or harsh environments |
| ±5% VZ tolerance | Reduces need for post-production trimming in voltage reference circuits |
| 100°C/W RθJA | Enables thermal modeling for trace width and copper pour requirements on standard FR-4 PCBs |
| RoHS compliance | Meets global environmental directives without lead or hazardous substance exemptions |
| Single-die construction | Ensures consistent parametric behavior without multi-die matching variability |
Applications
| Low-Voltage Stabilizers | On-Board DC/DC Converters |
|---|---|
Use Scenario: Providing stable bias voltage for op-amp references or microcontroller reset circuits in battery-powered devices. IC Role / Device Role / Timing Role: Shunt voltage regulator maintaining fixed 51 V reference point independent of supply variation. Use Value: Delivers ±5% accuracy and sub-100 Ω impedance to minimize output ripple in low-power analog subsystems. | Use Scenario: Setting feedback threshold in isolated flyback or buck-derived auxiliary supplies for industrial controllers. IC Role / Device Role / Timing Role: Precision Zener reference in optocoupler-coupled feedback loop for secondary-side regulation. Use Value: Enables tight output voltage control (±1%) over temperature via stable 51 V breakdown with low thermal coefficient. |
| Lighting Applications | Adapters |
Use Scenario: Overvoltage protection and voltage clamping in LED driver constant-current circuits with wide-input ranges. IC Role / Device Role / Timing Role: Transient voltage suppressor and steady-state clamp protecting MOSFET gate drivers and sense resistors. Use Value: Withstands 200°C junction temperature and absorbs surge energy up to 1 W without degradation in high-temperature luminaires. | Use Scenario: Output voltage regulation in wall-mounted AC/DC adapters for consumer electronics requiring cost-effective, reliable references. IC Role / Device Role / Timing Role: Primary-side shunt regulator establishing feedback setpoint for PWM controller ICs like UC384x series. Use Value: Offers proven reliability in high-volume adapter designs with DO-41 footprint compatibility and 5 µA leakage at 76% of VZ. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4757A | Same 51 V ±5%, 1 W rating, but manufactured by ON Semiconductor; RθJA = 110°C/W vs. 100°C/W | Slightly higher thermal resistance may require larger copper area in thermally constrained layouts | Select when sourcing from ON Semi's authorized channels or where cross-qualified qualification is required |
| BZX55-C51 | 51 V ±5%, 500 mW rating, DO-35 package; smaller size, lower power handling | Not suitable for 1 W continuous operation; limited to <500 mW average dissipation | Choose only for space-constrained, low-power applications where 1 W rating is not needed |
Compared with 1N4757A and BZX55-C51, the 1N4757G offers superior thermal performance (100°C/W vs. 110°C/W) and full 1 W capability in the industry-standard DO-41 footprint - making it optimal for robust, high-reliability voltage reference designs.
Availability
1N4757G is available at Aetrix Electronics and suitable for low-voltage stabilizers, on-board DC/DC converters, lighting applications, and adapters requiring stable component supply with full RoHS compliance and DO-41 mechanical consistency.
Supply support for 1N4757G 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 specifically for high-reliability, general-purpose voltage regulation in industrial power supplies and lighting systems - emphasizing hermetic sealing, wide temperature operation, and tight parametric consistency.
FAQ
What is the nominal Zener voltage and tolerance of the 1N4757G?
The 1N4757G has a nominal Zener voltage of 51 V with a standard tolerance of ±5%, meaning its actual breakdown voltage falls between 48.45 V and 53.55 V at 25°C and 5 mA test current. This tolerance is confirmed in the Electrical Specifications table of the Taiwan Semiconductor datasheet (Version G2301), and applies directly to the 1N4757G part number.
What is the maximum power dissipation and thermal resistance of the 1N4757G?
The 1N4757G is rated for 1 W maximum power dissipation at 25°C ambient, with junction-to-ambient thermal resistance (RθJA) of 100°C/W and junction-to-lead resistance (RθJL) of 53.5°C/W. These values are specified in the Absolute Maximum Ratings and Thermal Performance sections of the official TSC datasheet and define safe operating limits for PCB layout and thermal design.
What package type and marking does the 1N4757G use?
The 1N4757G uses the DO-41 axial-leaded, hermetically sealed glass package with pure tin-plated leads compliant with J-STD-002. Its marking code is "1N4757G", printed on the body, with cathode polarity indicated by a painted band. Package dimensions and lead finish are documented in the Mechanical Data section of the TSC datasheet (Version G2301).
What is the Zener impedance and leakage current specification for the 1N4757G?
The 1N4757G has a Zener impedance (ZZT) of 95 Ω measured at 5 mA test current (IZT), and a maximum leakage current (IR) of 5 µA at 38.8 V reverse voltage (VR). These parameters are explicitly listed in the Electrical Specifications table for 1N4757G in the Taiwan Semiconductor datasheet (Version G2301) and reflect its regulation stability and off-state performance.
Is the 1N4757G RoHS compliant and what is its operating temperature range?
Yes, the 1N4757G is RoHS compliant as stated in the Features section of the Taiwan Semiconductor datasheet. Its junction temperature range is -65°C to +200°C, and storage temperature range matches this span. These ratings are confirmed in the Absolute Maximum Ratings table and support use in automotive, industrial, and lighting applications with extreme thermal profiles.
1N4757G 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):
- 51 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 38.8 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)
1N4757G FAQ
1.How can I place an order for 1N4757G through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4757G 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 1N4757G reliable?
The price and inventory of 1N4757G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4757G is usually 5 days.
3.What payment methods are accepted for 1N4757G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4757G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4757G?
1N4757G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4757G 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 1N4757G?
For technical support, including 1N4757G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4757G requirements.
6.How does Aetrix verify that 1N4757G is sourced from the original manufacturer or authorized distributors?
All 1N4757G 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 1N4757G meets industry standards.
7.What is the process for return or replacement of 1N4757G?
All 1N4757G units undergo pre-shipment inspection (PSI). If there is an issue with 1N4757G, 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 1N4757G part is unused and in its original packaging.
Return procedure for 1N4757G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4757G Tags
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