Diodes Incorporated 1N5230B-T

Overview

1N5230B-T from Diodes Incorporated is a 4.7 V, ±5% tolerance, 500 mW surface-mount Zener diode in a hermetic DO-35 glass package, rated for operation from –65°C to +175°C, with 19 Ω dynamic impedance at 20 mA and +0.030 %/°C temperature coefficient-used for precision voltage reference and overvoltage protection in low-power analog circuits.

For engineers reviewing the 1N5230B-T datasheet, 1N5230B-T pinout, 1N5230B-T application, or 1N5230B-T equivalent, this part serves as a stable, RoHS-compliant Zener reference in space-constrained designs where thermal stability, low leakage (<5 µA at 3.76 V), and repeatable breakdown behavior are critical.

Technical Context

This Zener diode operates in reverse-biased breakdown mode with a nominal Zener voltage of 4.7 V at 20 mA test current, exhibiting tight ±5% tolerance and a positive temperature coefficient of +0.030 %/°C-enabling predictable drift compensation in bias networks. Its 19 Ω Zener impedance at I_ZT ensures minimal output variation under load changes.

The device uses an epitaxial construction in a hermetic glass DO-35 package, delivering high long-term stability and low moisture sensitivity (J-STD-020 Level 1). It supports lead-free soldering (Sn96.5Ag3.5) and maintains 500 mW power dissipation when leads are held ≤75°C with 9.5 mm lead length.

Key Specifications

Pinout & Package

Package: Hermetic DO-35 glass axial package with cathode band marking; dimensions: A ≤25.4 mm, B ≤4.0 mm, C ≤0.6 mm, D ≤2.0 mm; weight ≈0.13 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMSZ5230B and 1N4732A, the 1N5230B-T offers optimal balance of hermetic reliability, axial through-hole compatibility, and thermal stability across –65°C to +175°C-making it suitable for legacy-replacement and high-reliability niche applications where DO-35 form factor and long-term parameter consistency are prioritized.

Availability

1N5230B-T is available at Aetrix Electronics and suitable for low-power voltage reference, overvoltage clamp, and temperature-compensated bias applications requiring stable component supply and long-lifecycle support despite its obsolete status.

Supply support for 1N5230B-T 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.

The 1N52xxB series belongs to Diodes' legacy Zener diode product line, engineered for precision voltage regulation and clamping in cost-sensitive, high-volume consumer and industrial applications where reliability and consistency are essential.

FAQ

Is the 1N5230B-T still in active production?

No-the 1N5230B-T is officially obsolete and discontinued by Diodes Incorporated, as stated in DS18006 Rev. 19. It is superseded by the MMSZ5230B for new designs. However, Aetrix Electronics maintains limited legacy inventory with full traceability and documentation for ongoing maintenance and repair programs.

What is the maximum reverse voltage before breakdown for the 1N5230B-T?

The guaranteed Zener breakdown occurs between 4.47 V and 4.94 V at 20 mA test current. Below 4.47 V, reverse leakage remains ≤5.0 µA at 3.76 V. Breakdown is not abrupt; voltage rises gradually until reaching the specified knee region near 4.7 V.

Can the 1N5230B-T be used in place of the 1N4732A?

Only in low-power applications ≤500 mW and where DO-35 axial mounting is acceptable. The 1N4732A has higher power rating (1 W) and lower impedance (9 Ω), but larger DO-41 package and different thermal characteristics. Direct substitution requires verification of power derating and layout constraints.

Does the 1N5230B-T meet automotive AEC-Q200 requirements?

No-it is not qualified to AEC-Q200. While it operates from –65°C to +175°C, it lacks the stress testing, failure analysis, and qualification reporting required for automotive use. For AEC-Q200-compliant alternatives, consider Diodes' AZ series or ON Semiconductor's 1SMA5914BT3G.