Microchip Technology 1N5244B

Overview

1N5244B from Microsemi is a 14 V, ±5% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 9.0 mA test current and 15 Ω dynamic impedance at IZT, used for precision voltage regulation in low-power analog reference and biasing circuits.

For engineers reviewing the 1N5244B datasheet, 1N5244B pinout, 1N5244B application, or 1N5244B equivalent, this page delivers verified electrical specs, thermal derating behavior, Zener voltage temperature coefficient (+0.082 %/°C), cathode-band polarity marking, and RoHS-compliant e3 variant availability.

Technical Context

The 1N5244B operates as a two-terminal voltage reference device with sharp reverse-breakdown knee, defined by its 14 V nominal Zener voltage at 9.0 mA test current (IZT) and 15 Ω dynamic impedance (ZZT) measured under AC-superimposed conditions per JEDEC standards.

It exhibits a positive temperature coefficient of +0.082 %/°C over 25–125 °C, requires cathode-banded end to be held positive for regulation, and maintains stable performance across –65 °C to +175 °C operating temperature range with 250 °C/W junction-to-lead thermal resistance.

Key Specifications

Pinout & Package

DO-35 (DO-204AH) hermetically sealed glass axial-leaded package with cathode identified 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 1N5244B, 1N4742A offers higher power but different voltage and package, while BZX55C14 matches voltage and package but improves low-current impedance - both serve distinct trade-offs in thermal, layout, and regulation fidelity requirements.

Availability

1N5244B is available at Aetrix Electronics and suitable for low-power voltage reference, overvoltage clamp, and temperature-stable bias generator applications requiring stable component supply and long-term obsolescence management.

Supply support for 1N5244B 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 precision analog components for aerospace, defense, and industrial markets.

The 1N52xxB series was designed for general-purpose, high-stability Zener regulation in space-constrained, thermally demanding environments where hermetic glass packaging and wide temperature operation are essential.

FAQ

What is the nominal Zener voltage and tolerance of the 1N5244B?

The 1N5244B has a nominal Zener voltage of 14 V with a guaranteed tolerance of ±5% at 25 °C, as indicated by the "B" suffix per JEDEC specification. This means the actual V_Z falls between 13.3 V and 14.7 V under standard test conditions (9.0 mA I_ZT). The tolerance is validated per Microsemi's published electrical characteristics table and applies across the full operating temperature range.

What package type and marking does the 1N5244B use?

The 1N5244B uses the DO-35 (DO-204AH) hermetically sealed glass axial-leaded package. It is marked with the full part number "1N5244B" on the body, and the cathode is identified by a single black band on the banded end. Polarity must be observed: the banded end is the cathode and must be held positive relative to the anode for Zener regulation.

What is the Zener impedance and test condition for the 1N5244B?

The 1N5244B has a maximum Zener impedance (Z_ZT) of 15 Ω, measured at the 9.0 mA test current (I_ZT) using a 60 Hz AC signal equal to 10% of I_ZT superimposed on DC bias. This low dynamic impedance ensures minimal voltage variation under changing load conditions, supporting stable regulation in precision analog circuits.

Does the 1N5244B have a specified temperature coefficient, and what is its value?

Yes, the 1N5244B has a specified temperature coefficient (αV_Z) of +0.082 %/°C, measured between 25 °C and 125 °C at rated I_ZT. This positive coefficient indicates that the Zener voltage increases linearly with temperature - a key parameter for designing temperature-compensated references or predicting drift in wide-temperature applications.

Is the 1N5244B RoHS compliant, and how is compliance indicated?

Yes, RoHS-compliant versions of the 1N5244B are available with the "e3" suffix (e.g., 1N5244Be3), indicating annealed matte-tin plating per RoHS Directive 2011/65/EU. The base 1N5244B uses traditional tin-lead plating; only the e3-suffixed variant meets lead-free requirements. Both share identical electrical and thermal specifications.