onsemi 1N4750A-T50A

Overview

1N4750A-T50A from ON Semiconductor is a 27 V, 1 W Zener diode in DO-41 glass package with ±5% tolerance, 9.5 Ω dynamic impedance at 14 mA test current, and 0.25 μA leakage at 20.6 V reverse voltage. It provides precise voltage regulation in power supply feedback paths, overvoltage protection circuits, and reference voltage generation for industrial sensor interfaces.

For engineers reviewing the 1N4750A-T50A datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy, thermal derating behavior above 50°C, junction temperature range (−65°C to +200°C), and compliance with ON Semiconductor's 1N47xxA family mechanical and electrical specifications.

Technical Context

This device operates as a two-terminal voltage reference using avalanche breakdown in silicon. Its 27 V nominal Zener voltage is specified at 14 mA test current (IZ), with typical dynamic impedance of 9.5 Ω and maximum 12.5 Ω at that condition. The 1.0 W power rating applies only when lead temperature (TL) is held ≤50°C with 3/8″ lead length.

Thermal derating is linear at 6.67 mW/°C above 50°C, enabling predictable power handling in ambient temperatures up to +200°C. Leakage current remains ≤0.25 μA at VR = 20.6 V (80% of VZ), supporting low-power standby regulation and precision biasing where minimal reverse conduction is critical.

Key Specifications

Pinout & Package

DO-41 glass axial package with cathode indicated by a single black band. Two-terminal device: anode (unbanded end) and cathode (banded end). No internal connections beyond the two leads; polarity must be observed for correct Zener operation in reverse-bias configuration.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener voltage regulation applications.

Compared with 1N4750A-T50A, the 1N4750A-TP offers identical performance in automated manufacturing, while BZX55-C27 trades power capability and thermal robustness for smaller size-making it suitable only in thermally benign, low-power contexts where 1N4750A-T50A's 1 W rating and DO-41 ruggedness are unnecessary.

Availability

1N4750A-T50A is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, and precision reference designs requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for 1N4750A-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

ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The 1N47xxA series was designed specifically for general-purpose Zener regulation in cost-sensitive, high-reliability applications-emphasizing tight voltage tolerance, wide temperature operation, and DO-41 compatibility across 3.3 V to 100 V ratings.

FAQ

What is the Zener voltage tolerance for 1N4750A-T50A?

The 1N4750A-T50A has a guaranteed Zener voltage range of 25.65 V to 28.35 V at 14 mA test current, corresponding to a ±5% tolerance per ON Semiconductor's 1N47xxA family specification. This tolerance is measured under thermal equilibrium conditions at lead temperature of 30°C ±1°C with 3/8″ lead length, and applies across the full operating temperature range of −65°C to +200°C.

Can 1N4750A-T50A be used in surface-mount designs?

No, the 1N4750A-T50A uses a DO-41 axial glass package intended for through-hole mounting. It is not compatible with SMT reflow processes. For surface-mount equivalents, consider ON Semiconductor's MMBZ52xxBL series or other SOD-123 packaged Zeners-but note these differ in power rating, impedance, and thermal behavior. The 1N4750A-T50A must be mounted in plated-through holes with appropriate lead forming and soldering per IPC-A-610 Class 2/3 guidelines.

What is the maximum allowable reverse voltage before breakdown for 1N4750A-T50A?

The 1N4750A-T50A begins controlled Zener breakdown at its nominal 27 V rating, with minimum VZ of 25.65 V and maximum of 28.35 V. Below 20.6 V (80% of nominal VZ), leakage current is guaranteed ≤0.25 μA. Applying reverse voltage above 28.35 V risks exceeding the device's safe operating area unless current is strictly limited by external series resistance to prevent thermal runaway.

How does thermal derating affect 1N4750A-T50A's power handling?

1N4750A-T50A is rated for 1.0 W only when lead temperature (TL) is maintained at or below 50°C with 3/8″ lead length. Above 50°C, power must be linearly derated at 6.67 mW/°C-reducing to zero at TL = 200°C. This means at 100°C lead temperature, maximum safe dissipation drops to 667 mW. Proper PCB copper pour and airflow must be modeled to ensure TL stays within limits under worst-case ambient and power conditions.

Is 1N4750A-T50A RoHS compliant and halogen-free?

Yes, the 1N4750A-T50A meets RoHS Directive 2011/65/EU and is halogen-free per ON Semiconductor's PPAP documentation. The DO-41 glass package contains no lead in solderable terminations, and all materials comply with JEDEC J-STD-609A Class 1 for moisture sensitivity and IPC-1752 for substance declaration. Full compliance data is available in ON Semiconductor's material declarations portal under document ID 1N4750A-ROHS.