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onsemi 1N757A_T50R
- Part No.:
- 1N757A_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N757A_T50R.pdf
- Description:
- DIODE ZENER 9.1V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:3,765
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Product details
Overview
1N757A_T50R from Fairchild Semiconductor is a 5.6 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 and 40 mA maximum zener current (IZM) at 25°C, used for precision voltage regulation in low-power analog reference circuits.
For engineers reviewing the 1N757A_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance (±5%), thermal derating slope (4.0 mW/°C above 75°C), cathode-band polarity marking, and DO-35 mechanical compatibility with through-hole PCB layouts.
Technical Context
The 1N757A_T50R operates as a two-terminal voltage reference device, maintaining stable reverse-biased breakdown at nominal 5.6 V with 10 Ω dynamic impedance (ZZ) measured at IZ = 20 mA. Its junction temperature range spans −65°C to +200°C, and leakage current is limited to 0.1 µA at VR = 1 V.
Power handling follows a linear derating curve: full 500 mW up to 75°C lead temperature, then reduced by 4.0 mW per °C rise. The DO-35 glass package features a visible cathode band and 3/8″ lead length specification for thermal measurement compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VZ @ IZ = 20 mA | 5.6 V nominal, min 5.32 V / max 5.88 V - defines regulated output voltage under standard test condition |
| ZZ @ IZ = 20 mA | 10 Ω - indicates small-signal AC resistance affecting regulation stability under varying load |
| IZM @ 25°C | 40 mA - maximum continuous DC zener current before thermal runaway risk at ambient temperature |
| PD @ TL ≤ 75°C | 500 mW - absolute maximum power dissipation with specified lead length and mounting condition |
| IR @ VR = 1 V | 0.1 µA - reverse leakage magnitude confirming low-noise performance in high-impedance bias networks |
| Tolerance | ±5% - specifies allowable deviation of VZ from nominal value across production lot |
| Package | DO-35 - axial glass-body package with cathode band, standardized for manual and wave soldering |
Pinout & Package
DO-35 glass package: hermetically sealed axial-lead diode with cathode identified by a single painted band on the body; leads are tinned copper, 3/8″ length specified for thermal testing compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-bias regulation configuration |
| Cathode | Zener breakdown terminal | Marked with color band; connected to higher-potential node to enable controlled avalanche conduction |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage reference | 5.6 V ±5% tolerance ensures predictable clamping in feedback and bias networks |
| Low dynamic impedance | 10 Ω at 20 mA enables tight regulation under moderate load transients |
| High-temperature operation | −65°C to +200°C junction range supports automotive under-hood and industrial control environments |
| Hermetic DO-35 packaging | Glass-body construction provides long-term reliability and moisture resistance without conformal coating |
| Standardized marking | "57A" top mark (Line 2 = "57", Line 3 = "A") enables rapid visual identification per Fairchild spec Rev. D1 |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in discrete linear regulators or op-amp reference nodes. IC Role / Device Role / Timing Role: Voltage reference element providing fixed 5.6 V基准 for error amplifier comparison. Use Value: ±5% VZ tolerance and 10 Ω ZZ ensure <1% output drift over line/load variations in 12 V input supplies. |
Use Scenario: Protecting microcontroller I/O pins from ESD-induced voltage spikes. IC Role / Device Role / Timing Role: Shunt clamp limiting transient voltage to 5.88 V peak during fast-rising surges. Use Value: 0.1 µA IR at 1 V guarantees negligible standby current draw in always-on protection circuits. |
| Current Source Bias | Analog Sensor Excitation |
Use Scenario: Generating stable bias current for JFET or BJT amplifiers via series resistor. IC Role / Device Role / Timing Role: Constant-voltage node enabling predictable IB = (VCC − 5.6 V)/RB calculation. Use Value: Tight VZ tolerance allows ±5% current accuracy without trimming resistors in production. |
Use Scenario: Supplying excitation voltage to resistive temperature detectors (RTDs) or strain gauges. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source replacing IC references in cost-sensitive sensor front-ends. Use Value: DO-35 package fits compact sensor modules; 200°C max TJ supports high-temp industrial sensing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4734A (ON Semiconductor) | Same 5.6 V nominal VZ, ±5% tolerance, but 15 Ω ZZ and 1 W PD rating in DO-41 package | Higher power handling suits higher-current shunt regulation; larger DO-41 footprint requires layout change | Select when >500 mW dissipation or board space permits DO-41 |
| BZX55-C5V6 (Vishay) | 5.6 V ±5%, 10 Ω ZZ, 500 mW PD, but in DO-35 with tighter IR spec (≤0.1 µA @ 1 V same), different marking | Identical electrical specs and package; qualified to AEC-Q200 for automotive use | Prefer for automotive-grade designs requiring stress-tested qualification |
Compared with 1N757A_T50R, the 1N4734A offers higher power margin but requires PCB rework, while the BZX55-C5V6 delivers identical regulation performance with automotive qualification-making it a drop-in alternative only where AEC-Q200 compliance is mandated.
Availability
1N757A_T50R is available at Aetrix Electronics and suitable for precision voltage reference, overvoltage protection, and analog sensor excitation applications requiring stable component supply and legacy through-hole compatibility.
Supply support for 1N757A_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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, signal conditioning, and discrete components before its acquisition by ON Semiconductor in 2016.
The 1N757A_T50R belongs to Fairchild's legacy 1N7xxA Zener diode family, designed for general-purpose voltage regulation and clamping in cost-sensitive industrial, consumer, and instrumentation circuits.
FAQ
What is the nominal zener voltage and tolerance of the 1N757A_T50R?
The 1N757A_T50R has a nominal zener voltage of 5.6 V with a tolerance of ±5%, meaning the actual VZ falls between 5.32 V and 5.88 V when measured at IZ = 20 mA and TA = 25°C. This tolerance is guaranteed across production lots and is critical for designing accurate reference and clamp circuits using the 1N757A_T50R.
What is the maximum power dissipation and thermal derating behavior of the 1N757A_T50R?
The 1N757A_T50R is rated for 500 mW power dissipation at lead temperature (TL) ≤ 75°C with 3/8″ lead length. Above 75°C, power must be linearly derated at 4.0 mW/°C. This derating ensures safe operation up to +200°C junction temperature and directly impacts heatsinking requirements in the 1N757A_T50R design.
How is the cathode identified on the 1N757A_T50R package?
The cathode of the 1N757A_T50R is marked by a single painted band on the DO-35 glass body. Per Fairchild Rev. D1 marking specification, this band aligns with the "A" in the third-line top mark "57A", confirming polarity for correct reverse-bias connection in all 1N757A_T50R implementations.
What is the dynamic impedance (ZZ) of the 1N757A_T50R and why does it matter?
The 1N757A_T50R exhibits 10 Ω dynamic impedance (ZZ) measured at IZ = 20 mA. This value quantifies how much the zener voltage changes with small variations in current - lower ZZ improves regulation accuracy under load transients, making the 1N757A_T50R suitable for stable reference generation in sensitive analog circuits.
Is the 1N757A_T50R suitable for high-temperature environments?
Yes, the 1N757A_T50R supports an operating junction temperature range of −65°C to +200°C. Its DO-35 glass package and silicon die construction maintain parameter stability across this range, enabling reliable use in under-hood automotive, industrial motor controls, and downhole instrumentation where the 1N757A_T50R must function without derating at elevated ambient temperatures.
1N757A_T50R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- 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_T50R FAQ
1.How can I place an order for 1N757A_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N757A_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 1N757A_T50R reliable?
The price and inventory of 1N757A_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N757A_T50R is usually 5 days.
3.What payment methods are accepted for 1N757A_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N757A_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N757A_T50R?
1N757A_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N757A_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 1N757A_T50R?
For technical support, including 1N757A_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N757A_T50R requirements.
6.How does Aetrix verify that 1N757A_T50R is sourced from the original manufacturer or authorized distributors?
All 1N757A_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 1N757A_T50R meets industry standards.
7.What is the process for return or replacement of 1N757A_T50R?
All 1N757A_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N757A_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 1N757A_T50R part is unused and in its original packaging.
Return procedure for 1N757A_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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