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onsemi 1N4757A_T50R
- Part No.:
- 1N4757A_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4757A_T50R.pdf
- Description:
- DIODE ZENER 51V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:7,072
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Product details
Overview
1N4757A_T50R from ON Semiconductor is a 51 V ±5% Zener diode in DO-41 glass package, rated for 1.0 W power dissipation at TL ≤ 50°C with 6.67 mW/°C derating, 90 Ω max Zener impedance at 36 mA test current, and 0.25 μA max leakage current at 38.8 V reverse voltage. It provides precise voltage regulation in low-power reference and protection circuits.
For engineers reviewing the 1N4757A_T50R datasheet, pinout, applications, or equivalent options, key selection factors include its 51 V nominal Zener voltage, DO-41 axial lead package compatibility, thermal derating behavior, low leakage at rated VR, and suitability for fixed-voltage clamp and biasing roles in industrial power supplies and sensor signal conditioning.
Technical Context
This device operates as a two-terminal silicon Zener diode optimized for stable voltage reference and overvoltage clamping. Its 51 V breakdown is specified at 36 mA test current (IZ), with 90 Ω dynamic impedance (ZZ) measured under those conditions and 5 Ω knee impedance (ZZK) at 0.25 mA (IZK).
The 1N4757A_T50R supports operation across –65°C to +200°C junction and storage temperature range, with non-repetitive peak reverse surge current of 90 mA (IZSM) at 8.3 ms pulse width, and maximum 5 μA leakage current at 38.8 V (VR = 0.76 × VZ).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 51 V nominal, ±5% tolerance - defines precise clamping threshold for voltage regulation |
| Test Current (IZ) | 36 mA - operating point where VZ and ZZ are guaranteed per spec |
| Zener Impedance (ZZ) | 90 Ω max at IZ = 36 mA - indicates voltage stability under load variation |
| Power Dissipation (PD) | 1.0 W at TL ≤ 50°C - sets maximum continuous DC power handling on standard leads |
| Leakage Current (IR) | 0.25 μA max at VR = 38.8 V - ensures minimal error current in high-impedance bias networks |
| Operating Temp Range | –65°C to +200°C - enables use in extended-temperature industrial and automotive under-hood environments |
| Package | DO-41 glass case with cathode band - industry-standard axial lead package for through-hole mounting and manual rework |
Pinout & Package
DO-41 glass axial-leaded package: cylindrical body with cathode marked by single black band; anode and cathode terminals are unidirectional, with cathode serving as voltage reference node in reverse-biased operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection | Connected to circuit ground or lower potential when used in reverse-bias regulation |
| Cathode | Zener reference terminal / high-side connection | Provides stable 51 V output relative to anode; marked with black band for polarity identification |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables predictable clamping without post-production trimming in cost-sensitive designs |
| 1.0 W power rating with linear derating | Supports robust transient energy absorption in power supply feedback loops and surge protectors |
| Low 0.25 μA leakage at 38.8 V | Minimizes loading error in high-resistance voltage divider bias networks |
| DO-41 mechanical standardization | Ensures compatibility with legacy PCB footprints, wave soldering profiles, and hand-soldering tooling |
| –65°C to +200°C operating range | Validates reliability in harsh environments including motor control enclosures and outdoor power converters |
Applications
| Industrial Power Supply Feedback | Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or forward converter feedback paths using optocoupler-coupled TL431 alternatives. IC Role / Device Role / Timing Role: Zener reference element providing stable 51 V threshold for error amplifier bias and overvoltage detection. Use Value: Maintains ±5% output regulation accuracy across line/load/temperature without active compensation components. |
Use Scenario: Biasing and clamping analog front-end stages for RTD or thermocouple interfaces operating near 48 V rails. IC Role / Device Role / Timing Role: Passive voltage clamp protecting op-amp inputs from ESD or transients exceeding 38.8 V. Use Value: Limits input swing to safe levels while contributing <0.25 μA leakage-negligible in 100 kΩ+ sensor bridges. |
| Programmable Logic Controller I/O Protection | Automotive Body Control Module Reference |
Use Scenario: Overvoltage protection on 24 V digital input channels subjected to load dump or inductive kickback. IC Role / Device Role / Timing Role: Shunt clamp absorbing transient energy up to 90 mA (8.3 ms) to prevent controller damage. Use Value: Survives repeated 100 V/50 ms surges per ISO 7637-2 Pulse 1/2a without degradation due to 200°C max Tj rating. |
Use Scenario: Providing stable reference for microcontroller ADC calibration in 12 V battery-supplied BCM modules. IC Role / Device Role / Timing Role: Precision voltage source for ratiometric measurement against 5 V LDO outputs. Use Value: Delivers 51 V reference with <90 Ω impedance-reducing noise coupling into sensitive analog measurement paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4757A (ON Semiconductor) | Identical electrical specs and DO-41 package; differs only in tape-and-reel packaging (T50R denotes 500-unit reel) | No functional difference; same use cases and layout requirements | Select 1N4757A_T50R for automated SMT placement; choose bulk 1N4757A for manual prototyping or repair |
| BZX55-C51 (Vishay) | Same 51 V ±5%, DO-35 package (smaller glass body), 500 mW rating, higher ZZ (100 Ω), wider temp range (–65°C to +175°C) | Lower power handling limits use in >500 mW clamping; smaller footprint may require PCB redesign | Prefer BZX55-C51 only when space-constrained layouts or tighter thermal mass requirements exist |
Compared with 1N4757A_T50R, the base 1N4757A offers identical performance in bulk form but lacks tape-and-reel logistics for pick-and-place, while BZX55-C51 trades power capability and impedance for size reduction-making 1N4757A_T50R optimal for high-reliability 1 W reference designs requiring proven thermal margin.
Availability
1N4757A_T50R is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface circuits, programmable logic controller I/O protection, and automotive body control module references requiring stable component supply and long-term manufacturability.
Supply support for 1N4757A_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 specifically for general-purpose Zener voltage regulation and transient suppression in cost-sensitive, high-volume industrial and automotive systems-emphasizing consistency, thermal robustness, and DO-41 interoperability.
FAQ
What is the Zener voltage tolerance for 1N4757A_T50R?
The 1N4757A_T50R has a nominal Zener voltage of 51 V with a tolerance of ±5%, meaning the actual breakdown voltage falls between 48.45 V and 53.55 V at 36 mA test current and 25°C ambient. This tolerance is guaranteed per ON Semiconductor's 1N4728A–1N4758A datasheet Rev. 8, and applies directly to the 1N4757A_T50R variant as a tape-and-reel packaged version of the base 1N4757A device.
Can 1N4757A_T50R be used in surface-mount designs?
No, the 1N4757A_T50R uses a DO-41 glass axial-leaded package intended for through-hole mounting. It is not compatible with standard SMT reflow processes due to its leaded construction and thermal mass. For surface-mount equivalents, consider SOD-123 or SOD-323 packaged Zeners like MMBZ5257B, but note that those differ in voltage rating, power rating, and impedance-so direct substitution requires validation of 1N4757A_T50R's 51 V/1 W/90 Ω specification.
What is the maximum non-repetitive peak reverse current for 1N4757A_T50R?
The 1N4757A_T50R supports a non-repetitive peak reverse current (IZSM) of 90 mA at an 8.3 ms pulse width, as specified in the ON Semiconductor 1N4728A–1N4758A datasheet. This value reflects the device's surge-handling capability during transient overvoltage events such as inductive switching spikes or load dump pulses, and must be applied with appropriate series limiting resistance to avoid junction overheating.
How does thermal derating work for 1N4757A_T50R?
The 1N4757A_T50R is rated for 1.0 W power dissipation at lead temperature (TL) ≤ 50°C; above that, it derates linearly at 6.67 mW/°C. For example, at TL = 100°C, allowable power drops to 1.0 W − (50 × 6.67 mW) = 0.6665 W. This derating applies to steady-state DC operation and assumes 3/8″ lead length per the datasheet test condition-actual board layout and copper area will affect real-world thermal performance.
Is 1N4757A_T50R RoHS compliant and halogen-free?
Yes, the 1N4757A_T50R meets RoHS Directive 2011/65/EU requirements and is manufactured as a halogen-free device per ON Semiconductor's product compliance documentation. The DO-41 glass package contains no lead in solderable terminations, and all materials comply with JEDEC JS-709E standards. Full compliance data-including substance declarations and test reports-is available via ON Semiconductor's website using the 1N4757A_T50R part number.
1N4757A_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):
- 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:
- -
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
1N4757A_T50R FAQ
1.How can I place an order for 1N4757A_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4757A_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 1N4757A_T50R reliable?
The price and inventory of 1N4757A_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4757A_T50R is usually 5 days.
3.What payment methods are accepted for 1N4757A_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4757A_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4757A_T50R?
1N4757A_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4757A_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 1N4757A_T50R?
For technical support, including 1N4757A_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4757A_T50R requirements.
6.How does Aetrix verify that 1N4757A_T50R is sourced from the original manufacturer or authorized distributors?
All 1N4757A_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 1N4757A_T50R meets industry standards.
7.What is the process for return or replacement of 1N4757A_T50R?
All 1N4757A_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N4757A_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 1N4757A_T50R part is unused and in its original packaging.
Return procedure for 1N4757A_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4757A_T50R Tags
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