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onsemi 1N757A_T50A
- Part No.:
- 1N757A_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N757A_T50A.pdf
- Description:
- DIODE ZENER 9.1V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:7,332
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Product details
Overview
1N757A_T50A from Fairchild Semiconductor is a 9.1 V ±5% silicon Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C, with 10 Ω dynamic impedance at 20 mA test current and 0.1 µA reverse leakage at 1 V, used for precision voltage regulation in low-power analog reference circuits.
For engineers reviewing the 1N757A_T50A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, thermal derating behavior, cathode-band polarity marking, and DO-35 mechanical compatibility with through-hole PCB layouts.
Technical Context
This device operates as a two-terminal voltage reference diode relying on controlled reverse-biased avalanche breakdown. Its 9.1 V nominal zener voltage is specified at 20 mA test current with ±5% tolerance, and its 10 Ω dynamic impedance (ZZ) reflects low voltage variation under load changes.
Thermal performance is defined by a 4.0 mW/°C derating slope above 75°C lead temperature, and it supports operation across -65°C to +200°C junction/storage range. The DO-35 package uses a visible cathode band for unambiguous polarity identification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V nominal at IZ = 20 mA; ensures stable reference point for biasing or clamping within ±5% tolerance. |
| Dynamic Impedance (ZZ) | 10 Ω max at IZ = 20 mA; limits output voltage shift under varying load current. |
| Max Power Dissipation (PD) | 500 mW at TL ≤ 75°C; defines safe continuous DC power handling before thermal derating applies. |
| Reverse Leakage (IR) | 0.1 µA max at VR = 1 V; confirms minimal parasitic conduction in sub-breakdown region. |
| Operating Temp Range | -65°C to +200°C; supports deployment in automotive under-hood, industrial control, and aerospace environments. |
| Tolerance | ±5%; enables predictable circuit margining without post-production trimming. |
| Package | DO-35 glass axial; provides hermetic sealing, standard lead spacing (3/8″), and cathode band polarity marking. |
Pinout & Package
DO-35 glass axial package with cathode identified by a single color band on the body; leads are unmarked anode/cathode terminals suitable for through-hole mounting. Mechanical dimensions conform to JEDEC DO-35 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit common when used in reverse-bias regulation; carries forward current up to 200 mA (VF ≤ 1.5 V). |
| Cathode | Zener breakdown terminal / Regulated output node | Marked with color band; supplies stable 9.1 V relative to anode when reverse-biased above breakdown threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Stable Zener voltage | 9.1 V ±5% at 20 mA ensures repeatable reference accuracy without calibration. |
| Low dynamic impedance | 10 Ω max minimizes output voltage drift across load current variations in feedback networks. |
| Hermetic DO-35 package | Glass-sealed construction guarantees long-term parameter stability in humid or corrosive environments. |
| Wide temperature range | -65°C to +200°C operation supports reliability-critical applications beyond commercial grade. |
| Cathode polarity marking | Visible band eliminates orientation errors during manual or automated assembly. |
Applications
| Power Supply Reference | Analog Sensor Biasing |
|---|---|
Use Scenario: Providing stable 9.1 V reference for linear regulator error amplifiers or op-amp feedback dividers in offline AC-DC adapters. IC Role / Device Role / Timing Role: Voltage reference diode establishing precise DC setpoint independent of input ripple or load transients. Use Value: Maintains ±0.455 V regulation window over temperature and aging, reducing need for trim potentiometers. |
Use Scenario: Biasing bridge-based pressure or temperature sensors requiring fixed excitation voltage in industrial transmitters. IC Role / Device Role / Timing Role: Precision shunt reference supplying constant current to sensor elements via series resistor. Use Value: Enables <1% full-scale error contribution from reference drift across -40°C to +85°C ambient. |
| Overvoltage Clamp | Signal Level Translation |
Use Scenario: Protecting microcontroller I/O pins from transient surges exceeding 9.1 V in 12 V automotive subsystems. IC Role / Device Role / Timing Role: Shunt clamp diverting excess energy to ground once input exceeds zener breakdown threshold. Use Value: Limits peak voltage to ≤9.56 V (VZ max) with fast response, avoiding latch-up or ESD damage. |
Use Scenario: Shifting logic-level signals between 5 V and 3.3 V domains using passive level-shifter topology. IC Role / Device Role / Timing Role: Clamping diode defining upper rail of bidirectional level translation path. Use Value: Provides deterministic 9.1 V clamping ceiling while maintaining signal integrity below threshold. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4739A | 9.1 V ±5%, 1 W rating, DO-41 package, 10 Ω ZZ, but higher PD and larger footprint. | Suitable for higher-power regulation where thermal mass improves stability; not DO-35 drop-in. | Select when board layout allows DO-41 and >500 mW dissipation is required. |
| BZX55-C9V1 | 9.1 V ±5%, 500 mW, DO-35, 10 Ω ZZ, but tighter IR spec (≤0.1 µA @ 1 V same), RoHS-compliant. | Direct form-fit replacement with identical mechanical and electrical specs; preferred for new designs requiring compliance. | Choose for RoHS-constrained production or when sourcing legacy Fairchild stock is limited. |
Compared with 1N757A_T50A, 1N4739A offers higher power headroom at the cost of larger package and different thermal profile, while BZX55-C9V1 delivers identical regulation performance with modern environmental compliance and guaranteed availability.
Availability
1N757A_T50A is available at Aetrix Electronics and suitable for precision voltage reference, analog sensor excitation, overvoltage protection, and signal level translation requiring stable component supply and long-lifecycle support.
Supply support for 1N757A_T50A 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.
The 1N757A_T50A belongs to Fairchild's legacy 1N7xxA Zener diode family, designed for general-purpose voltage regulation and clamping in cost-sensitive, high-reliability industrial and automotive systems.
FAQ
What is the nominal zener voltage and tolerance of the 1N757A_T50A?
The 1N757A_T50A has a nominal zener voltage of 9.1 V with a ±5% tolerance, measured at 20 mA test current and 25°C ambient. This means the actual VZ falls between 8.65 V and 9.56 V under specified conditions, enabling predictable circuit design without post-manufacture adjustment.
What package type and polarity marking does the 1N757A_T50A use?
The 1N757A_T50A is housed in a DO-35 glass axial package with a visible cathode band on the body. The banded end is the cathode; the unmarked end is the anode. This marking complies with JEDEC standards and ensures correct orientation during manual or automated placement.
What is the maximum power dissipation and thermal derating behavior of the 1N757A_T50A?
The 1N757A_T50A is rated for 500 mW power dissipation at lead temperature (TL) ≤ 75°C. Above that temperature, power must be reduced at 4.0 mW/°C. At TL = 125°C, maximum allowable power drops to 300 mW, ensuring safe operation under elevated thermal stress.
How does the 1N757A_T50A perform in terms of reverse leakage current?
The 1N757A_T50A exhibits ≤0.1 µA reverse leakage current at 1 V reverse voltage and 25°C. This low leakage ensures minimal parasitic current draw in standby or high-impedance reference nodes, preserving battery life and measurement accuracy in precision analog circuits.
Is the 1N757A_T50A suitable for automotive under-hood applications?
Yes - the 1N757A_T50A supports an operating temperature range of -65°C to +200°C and is built in a hermetically sealed DO-35 glass package. These characteristics meet requirements for under-hood engine control modules, transmission sensors, and other automotive subsystems exposed to extreme thermal cycling.
1N757A_T50A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 9.1 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 10 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
1N757A_T50A FAQ
1.How can I place an order for 1N757A_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N757A_T50A 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 1N757A_T50A reliable?
The price and inventory of 1N757A_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N757A_T50A is usually 5 days.
3.What payment methods are accepted for 1N757A_T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N757A_T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N757A_T50A?
1N757A_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N757A_T50A 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 1N757A_T50A?
For technical support, including 1N757A_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N757A_T50A requirements.
6.How does Aetrix verify that 1N757A_T50A is sourced from the original manufacturer or authorized distributors?
All 1N757A_T50A 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 1N757A_T50A meets industry standards.
7.What is the process for return or replacement of 1N757A_T50A?
All 1N757A_T50A units undergo pre-shipment inspection (PSI). If there is an issue with 1N757A_T50A, 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 1N757A_T50A part is unused and in its original packaging.
Return procedure for 1N757A_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N757A_T50A Tags
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