Microchip Technology 1N5252B/TR

Overview

1N5252B/TR from Microsemi is a 500 mW, 24 V ±5% glass axial-lead Zener diode in DO-35 (DO-204AH) package, designed for precision voltage regulation in low-power analog circuits, reference supplies, and overvoltage protection. It delivers 24 V nominal Zener voltage at 5.2 mA test current, with 600 Ω maximum Zener impedance at knee current and ±0.088 %/°C temperature coefficient.

For engineers reviewing the 1N5252B/TR datasheet, 1N5252B/TR pinout, 1N5252B/TR application, or 1N5252B/TR equivalent, key selection criteria include its 24 V regulation tolerance, 500 mW power rating at 25°C, DO-35 mechanical compatibility, low reverse leakage (<0.1 μA at 19.2 V), and stable performance across –65°C to +175°C operating range.

Technical Context

This discrete Zener diode operates in reverse breakdown to maintain a stable 24 V reference under varying load and temperature conditions. Its 600 Ω dynamic impedance at IZK = 0.25 mA and 5.2 mA test current ensures predictable regulation knee behavior, critical for low-current biasing and sensing applications.

The device uses a hermetically sealed glass DO-35 package with tin-lead or RoHS-compliant matte-tin plating, cathode indicated by band. It exhibits minimal capacitance (typical <2 pF at 0 V), nonsensitive ESD performance per MIL-STD-750 Method 1020, and inherent radiation hardness per MicroNote 050.

Key Specifications

Pinout & Package

DO-35 (DO-204AH) glass axial-leaded package with cathode identified by color band; leads are flexible axial terminals suitable for through-hole mounting on FR4 PCBs with 1 oz copper.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5252B/TR, 1N4748A offers higher power but different voltage and package, while MMBZ5252BS provides same voltage in SMT form with reduced power and thermal mass-selection depends on mechanical fit, thermal budget, and voltage requirement.

Availability

1N5252B/TR is available at Aetrix Electronics and suitable for voltage reference supplies, overvoltage clamp circuits, and low-power bias networks requiring stable component supply and long-term obsolescence management.

Supply support for 1N5252B/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, radiation-hardened, and high-voltage discrete and analog components.

The 1N52xxB series belongs to Microsemi's legacy DO-35 Zener diode product line, engineered for precision voltage regulation in harsh-environment applications including aerospace, defense, and industrial control.

FAQ

What is the nominal Zener voltage and tolerance of the 1N5252B/TR?

The 1N5252B/TR has a nominal Zener voltage of 24 V with a guaranteed tolerance of ±5%, as indicated by the "B" suffix per JEDEC specification. This tolerance is verified at 5.2 mA test current and 25°C ambient temperature, making it suitable for applications requiring tighter regulation than standard ±10% (A suffix) or ±20% (no suffix) variants.

What package type and marking does the 1N5252B/TR use?

The 1N5252B/TR is housed in a DO-35 (DO-204AH) hermetically sealed glass axial-leaded package with cathode identified by a color band. The device is marked with its full part number "1N5252B" on the glass body, and the "TR" suffix denotes tape-and-reel packaging per EIA-296 standard for automated assembly.

What is the maximum reverse leakage current for the 1N5252B/TR, and at what voltage is it specified?

The 1N5252B/TR specifies a maximum reverse leakage current of 0.1 μA at a reverse voltage (VR) of 19.2 V-80% of its nominal 24 V Zener voltage. This ultra-low leakage supports high-impedance reference and bias networks where standby current must be minimized without compromising regulation stability.

How does the temperature coefficient of the 1N5252B/TR affect its performance across operating range?

The 1N5252B/TR has a temperature coefficient of +0.088 %/°C, meaning its Zener voltage increases by approximately 21.1 mV per 10°C rise above 25°C. This predictable positive drift allows designers to compensate for thermal effects in precision references, especially in applications operating from –65°C to +175°C where total drift remains within ±1.5% over the full range.

Is the 1N5252B/TR suitable for high-reliability or radiation-exposed environments?

Yes, the 1N5252B/TR is inherently radiation-hardened per MicroNote 050 and qualified for military screening levels (e.g., JAN, JANTX) when ordered with appropriate prefixes and "-1" suffix. Its glass DO-35 construction, nonsensitive ESD performance (MIL-STD-750 Method 1020), and wide operating temperature range make it suitable for aerospace, defense, and nuclear instrumentation applications.