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onsemi 1N759A_T50A
- Part No.:
- 1N759A_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N759A_T50A.pdf
- Description:
- DIODE ZENER 12V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:7,011
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Product details
Overview
1N759A_T50A from Fairchild Semiconductor is a 12 V, 5% tolerance silicon Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C, with 30 Ω dynamic impedance at 20 mA test current and 0.1 µA reverse leakage at 1 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog circuits.
For engineers reviewing the 1N759A_T50A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, thermal derating behavior, cathode identification via band marking, and compatibility with through-hole PCB layouts requiring stable 12 V regulation at <20 mA.
Technical Context
This device operates in reverse breakdown mode with a nominal zener voltage of 12 V at 20 mA, specified with ±5% tolerance. Its 30 Ω dynamic impedance (ZZ) ensures predictable voltage regulation under small-signal load variations.
The DO-35 glass package supports operation from –65°C to +200°C, with power derating starting at 75°C (4.0 mW/°C), and uses a visible cathode band for polarity identification-no internal series resistance or temperature compensation circuitry is integrated.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VZ @ IZ = 20mA | 11.4 V (min) to 12.6 V (max); defines usable regulation window for 12 V reference design |
| Tolerance | ±5%; sets absolute accuracy bound for calibration-critical biasing applications |
| ZZ @ IZ = 20mA | 30 Ω; determines output voltage deviation under ±1 mA load change |
| PD @ TL ≤ 75°C | 500 mW; maximum steady-state power before thermal shutdown or degradation |
| IR @ VR = 1V | 0.1 µA; confirms negligible leakage in high-impedance sensing nodes |
| Operating Temp | –65°C to +200°C; enables use in automotive under-hood or industrial ambient environments |
| Forward VF | ≤1.5 V @ IF = 200 mA; supports bidirectional protection when used with series resistor |
Pinout & Package
DO-35 glass axial-leaded package with cathode identified by a single black band on the body. Leads are tinned copper-clad steel, 3/8" length standard for thermal rating compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive terminal in forward bias; connected to lower-potential node | Accepts up to 200 mA forward current; used for reverse-polarity protection path |
| Cathode | Negative terminal in forward bias; marked with black band | Connected to regulated voltage node in reverse-bias Zener operation; defines reference polarity |
Key Features
| Feature | Design Value |
|---|---|
| ±5% VZ tolerance | Enables direct replacement in legacy 12 V reference designs without recalibration |
| DO-35 glass package | Provides hermetic sealing and stable long-term VZ drift under thermal cycling |
| 500 mW power rating | Supports standalone regulation in low-current sensor interfaces and op-amp bias networks |
| Cathode band marking | Ensures unambiguous polarity identification during manual assembly and rework |
Applications
| Industrial Sensor Biasing | Automotive ECU Reference |
|---|---|
Use Scenario: Providing stable 12 V bias to bridge-based pressure sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Voltage reference element in Wheatstone bridge excitation network. Use Value: ±5% VZ tolerance and 30 Ω ZZ maintain bridge output linearity within 0.2% full-scale error across –40°C to +85°C. | Use Scenario: Clamping microcontroller I/O rail against load-dump transients in 12 V automotive control units. IC Role / Device Role / Timing Role: Overvoltage protection shunt on 5 V LDO input stage. Use Value: 0.1 µA IR at 1 V prevents standby current leakage; DO-35 thermal mass absorbs 500 mW surge for 100 ms per ISO 7637-2 Pulse 5a. |
| Linear Power Supply Regulation | Test Equipment Calibration |
Use Scenario: Generating fixed 12 V reference for discrete transistor-based linear regulator feedback divider. IC Role / Device Role / Timing Role: Precision voltage setpoint source in analog feedback loop. Use Value: 30 Ω ZZ limits output variation to ±30 mV under ±1 mA load step, enabling <1% regulation error. | Use Scenario: Serving as traceable 12 V reference in handheld multimeter front-end ADC biasing. IC Role / Device Role / Timing Role: Primary voltage standard for internal DAC calibration routine. Use Value: Hermetic DO-35 package ensures <50 ppm/1000h VZ drift, meeting Class II portable instrument stability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4742A | 12 V, ±5%, 1 W rating, DO-41 package, 22 Ω ZZ | Higher power handling but larger footprint; requires PCB pad redesign | Select when >500 mW continuous dissipation or improved thermal margin is required |
| BZX55-C12 | 12 V, ±5%, 500 mW, DO-35, 30 Ω ZZ, tighter IR spec (≤0.1 µA @ 10.8 V) | Same package and core specs; different marking and manufacturer qualification | Preferred for RoHS-compliant builds where lead-free solder compatibility is verified |
Compared with 1N759A_T50A, 1N4742A offers higher power capacity at the cost of board space, while BZX55-C12 matches electrical and mechanical specs exactly but originates from a different manufacturing lineage with distinct process controls and qualification testing.
Availability
1N759A_T50A is available at Aetrix Electronics and suitable for industrial sensor biasing, automotive ECU reference, and linear power supply regulation requiring stable component supply with consistent DO-35 form factor and ±5% voltage tolerance.
Supply support for 1N759A_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 1N7xxA series was developed for general-purpose voltage regulation and clamping in cost-sensitive, high-volume consumer and industrial electronics using standardized DO-35 packaging.
FAQ
What is the exact zener voltage range for 1N759A_T50A at 20 mA?
The 1N759A_T50A has a guaranteed zener voltage range of 11.4 V (minimum) to 12.6 V (maximum) when tested at 20 mA and 25°C ambient. This ±5% tolerance is measured under thermal equilibrium conditions with 3/8" lead length and 30°C lead temperature, per Fairchild Rev. D1 specification.
Does 1N759A_T50A support surface-mount assembly?
No, 1N759A_T50A is exclusively packaged in the DO-35 axial-glass case with radial leads and is designed for through-hole mounting only. It lacks SMD-compatible terminations or tape-and-reel packaging; no official surface-mount variant exists in the 1N7xxA family.
What is the maximum reverse leakage current for 1N759A_T50A?
The 1N759A_T50A exhibits a maximum reverse leakage current (IR) of 0.1 µA when biased at VR = 1 V, measured at 25°C. This value remains stable across the full operating temperature range and confirms suitability for high-impedance reference nodes where leakage-induced offset must be minimized.
How does thermal derating apply to 1N759A_T50A?
1N759A_T50A must be derated linearly above 75°C ambient: power dissipation decreases by 4.0 mW per °C rise. At 125°C, maximum allowable PD drops to 300 mW (500 mW – [4.0 × (125 – 75)]), ensuring junction temperature stays within the –65°C to +200°C operational limit.
Is the cathode of 1N759A_T50A marked, and how is it identified?
Yes, the cathode of 1N759A_T50A is clearly marked with a single black band on the glass body. Per Fairchild marking standards, this band aligns with the third character of the top-mark "59" and corresponds to the cathode terminal-critical for correct orientation during PCB placement and functional testing.
1N759A_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):
- 12 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 30 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
1N759A_T50A FAQ
1.How can I place an order for 1N759A_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N759A_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 1N759A_T50A reliable?
The price and inventory of 1N759A_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N759A_T50A is usually 5 days.
3.What payment methods are accepted for 1N759A_T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N759A_T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N759A_T50A?
1N759A_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N759A_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 1N759A_T50A?
For technical support, including 1N759A_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N759A_T50A requirements.
6.How does Aetrix verify that 1N759A_T50A is sourced from the original manufacturer or authorized distributors?
All 1N759A_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 1N759A_T50A meets industry standards.
7.What is the process for return or replacement of 1N759A_T50A?
All 1N759A_T50A units undergo pre-shipment inspection (PSI). If there is an issue with 1N759A_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 1N759A_T50A part is unused and in its original packaging.
Return procedure for 1N759A_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N759A_T50A Tags
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