Microchip Technology 1N5230A/TR

Overview

1N5230A/TR from Microsemi is a 4.7 V, ±10% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 20 mA test current and 19 Ω dynamic impedance at IZT, used for low-power voltage regulation and reference in analog power supplies and signal conditioning circuits.

For engineers reviewing the 1N5230A/TR datasheet, 1N5230A/TR pinout, 1N5230A/TR application, or 1N5230A/TR equivalent, this page delivers verified electrical specs, thermal derating behavior, Zener temperature coefficient (+/−0.030 %/°C), cathode band polarity marking, and RoHS-compliant tape-and-reel packaging details.

Technical Context

This discrete Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying load and temperature conditions. It exhibits a sharp knee at 20 mA test current with 19 Ω dynamic impedance (ZZT) and 50 Ω knee impedance (ZZK) at 0.25 mA, ensuring predictable regulation in low-current bias networks.

Its −65°C to +175°C operating range, 250 °C/W junction-to-lead thermal resistance (at 10 mm lead length), and 0.2 g mass support ruggedized industrial and aerospace applications where hermetic glass construction and radiation hardness per MicroNote 050 are required.

Key Specifications

Pinout & Package

Hermetically sealed DO-35 (JEDEC DO-204AH) glass axial-leaded package with cathode indicated by a single black band; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5230A/TR, 1N4732A offers double power handling but requires board redesign for DO-41 mounting, while MMBZ5230BS reduces size and enables pick-and-place assembly but sacrifices 60% power capacity and thermal robustness.

Availability

1N5230A/TR is available at Aetrix Electronics and suitable for low-power voltage reference, overvoltage protection, and bias network applications requiring stable component supply across industrial control, test equipment, and aerospace subsystems.

Supply support for 1N5230A/TR 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

Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, RF, and radiation-hardened components for defense, aerospace, and industrial markets.

The 1N52xx series was designed as a JEDEC-standardized family of general-purpose, glass-encapsulated Zener diodes targeting cost-sensitive yet reliability-critical applications where hermetic sealing and wide temperature operation are essential.

FAQ

What is the Zener voltage tolerance for 1N5230A/TR?

The "A" suffix in 1N5230A/TR specifies a nominal Zener voltage tolerance of ±10% at 25°C, meaning the actual breakdown voltage falls between 4.23 V and 5.17 V when tested at 20 mA. This tolerance is guaranteed per JEDEC specification and applies across the full operating temperature range unless otherwise derated by thermal effects.

Does 1N5230A/TR have RoHS-compliant packaging?

Yes - the "TR" suffix indicates tape-and-reel packaging, and RoHS compliance is achieved when the "e3" suffix is added (e.g., 1N5230Ae3/TR). The base 1N5230A/TR uses standard tin-lead plating unless explicitly ordered with e3, which substitutes annealed matte-tin per EU Directive 2011/65/EU.

What is the maximum reverse current for 1N5230A/TR at rated voltage?

At VR = 3.76 V (80% of nominal 4.7 V), the maximum reverse current IR for 1N5230A/TR is 50 μA. This value defines the onset of measurable conduction prior to the sharp Zener knee and is critical for designing low-leakage bias networks or high-impedance reference dividers.

How does thermal derating affect 1N5230A/TR power handling above 25°C?

1N5230A/TR dissipates 500 mW at 25°C, but power must be linearly derated by 4 mW/°C above that temperature due to its 250 °C/W junction-to-lead thermal resistance. At 75°C lead temperature, maximum allowable power drops to 300 mW - users must consult Figure 1 in the Microsemi datasheet for exact derating curves based on mounting method.

Is 1N5230A/TR suitable for use as a voltage clamp in digital I/O protection?

Yes - 1N5230A/TR is commonly used for clamping transients on 5 V logic lines. Its 4.7 V Zener voltage, 19 Ω dynamic impedance, and 500 mW rating allow it to absorb short-duration surges up to ~20 mA without failure, provided series current-limiting resistance is sized to keep peak power within derated limits during event duration.