Nexperia USA Inc. 1N4748A,133

Overview

1N4748A,133 from Nexperia is a 22 V ±5% Zener voltage regulator diode in a hermetically sealed SOD66 (DO-41) glass package, rated for 1000 mW total power dissipation and 500 mA maximum forward current. It operates with 23 Ω typical differential resistance at 11.5 mA test current and maintains stable reference voltage in low-power linear regulation circuits, commonly used in voltage reference and overvoltage protection stages of DC power supplies.

For engineers reviewing the 1N4748A,133 datasheet, 1N4748A,133 pinout, 1N4748A,133 application, or 1N4748A,133 equivalent, key selection considerations include Zener voltage tolerance, thermal resistance (110 K/W), reverse leakage at rated voltage, junction temperature limits (−65 °C to +200 °C), and axial-leaded SOD66 mechanical compatibility with through-hole PCB layouts.

Technical Context

This device functions as a two-terminal voltage reference by operating in reverse breakdown, where its 22 V nominal Zener voltage is stabilized across a defined working current range (0.25–5 mA). Its 23 Ω differential resistance ensures predictable voltage deviation under load variation, while the 110 K/W thermal resistance from junction to tie-point defines thermal derating behavior at elevated ambient temperatures.

The SOD66 package enables reliable heat transfer via axial leads, and the ±5% voltage tolerance supports cost-sensitive applications requiring moderate precision. Reverse current remains ≤5 µA at 17.6 V (80% of V_Z), confirming tight leakage control essential for low-quiescent-current bias networks.

Key Specifications

Pinout & Package

Hermetically sealed SOD66 (DO-41) axial-leaded glass package with cathode indicated by a colored band. Leads are tinned copper-clad steel, suitable for wave or hand soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4748A,133, the 1N4748A-T offers identical performance in automated manufacturing contexts, while BZX55C22 trades thermal capability and regulation stability for smaller size-making the ,133 version optimal for robust, medium-power reference and clamp roles.

Availability

1N4748A,133 is available at Aetrix Electronics and suitable for DC power supply reference, overvoltage clamp, and current source bias applications requiring stable component supply, consistent Zener voltage tolerance, and proven reliability in industrial-grade through-hole assemblies.

Supply support for 1N4748A,133 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

Nexperia is a global semiconductor expert delivering high-performance, reliable discrete, logic, and MOSFET solutions with focus on efficiency, miniaturization, and sustainability.

The 1N47xxA series belongs to Nexperia's general-purpose Zener diode product line, engineered for cost-effective, high-yield voltage regulation and protection in consumer, industrial, and automotive auxiliary circuits.

FAQ

What is the maximum reverse voltage that can be continuously applied without breakdown?

The 1N4748A,133 has a nominal Zener voltage of 22 V with ±5% tolerance, meaning breakdown begins between 20.9 V and 23.1 V. Applying voltage below 20.9 V ensures no significant reverse current flow; sustained reverse voltage above 23.1 V risks exceeding power limits and thermal runaway unless current is strictly limited by external series resistance.

How does thermal resistance affect derating at elevated ambient temperatures?

With a junction-to-tie-point thermal resistance of 110 K/W, the device dissipates 1 W at 50 °C ambient. For every 10 °C rise above 50 °C, allowable power must decrease by ~91 mW to maintain T_j ≤ 200 °C. At 70 °C ambient, maximum safe dissipation drops to 818 mW, requiring appropriate series resistance or airflow in high-temp enclosures.

Can this diode replace a 24 V Zener in a 22 V circuit?

No-1N4748A,133 is specifically rated for 22 V nominal Zener voltage. Substituting a 24 V part (e.g., 1N4749A) would raise the regulation point by ~2 V, potentially overvolting downstream 22 V-rated components. The 22 V rating ensures compatibility with 24 V rail systems where 2 V headroom is required for dropout and ripple margin.

Is the SOD66 package compatible with standard DO-41 footprints?

Yes-the SOD66 outline matches JEDEC DO-41 mechanical dimensions: 2.6 mm body diameter, 4.8 mm body length, and 25.4 mm lead spacing. Lead diameter (0.81 mm) and axial orientation are identical, enabling direct replacement in legacy DO-41 layouts without PCB modification.