Microchip Technology 1N5223B

Overview

1N5223B from Microsemi is a 2.7 V, ±5% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 20 mA test current and 1300 Ω dynamic impedance at IZK, operating from –65°C to +175°C. It serves as a precision voltage reference or shunt regulator in low-power analog circuits, power supply feedback paths, and overvoltage protection.

For engineers reviewing the 1N5223B datasheet, 1N5223B pinout, 1N5223B application, or 1N5223B equivalent, key selection criteria include its 2.7 V nominal Zener voltage, 5% tolerance, 1300 Ω Zener impedance at 0.25 mA, temperature coefficient of –0.080 %/°C, and DO-35 mechanical compatibility with axial-leaded PCB mounting.

Technical Context

This device operates in reverse-bias breakdown mode, delivering stable regulation across 1–20 mA operating current range with minimal capacitance (<2 pF typical per Figure 2). Its glass hermetic DO-35 package ensures robust thermal performance (250 °C/W junction-to-lead) and radiation hardness per MicroNote 050.

The 1N5223B exhibits a negative temperature coefficient (–0.080 %/°C), confirming voltage drift decreases with rising temperature - critical for temperature-stable biasing in sensor interfaces and reference dividers where thermal tracking matters.

Key Specifications

Pinout & Package

DO-35 (DO-204AH) glass axial-leaded package: hermetically sealed, tin-lead or RoHS-compliant matte-tin plating, cathode indicated by band, weight 0.2 g, lead length ≥10 mm for thermal rating compliance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5223B, 1N4728A offers higher power and voltage but requires PCB rework for DO-41, while BZX55C2V7 matches voltage and package but introduces opposing temperature drift behavior that impacts long-term reference stability in uncalibrated systems.

Availability

1N5223B is available at Aetrix Electronics and suitable for power supply feedback, sensor bias reference, and overvoltage clamp applications requiring stable component supply, extended temperature resilience, and JEDEC-standardized Zener performance.

Supply support for 1N5223B 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-temperature analog and mixed-signal components.

The 1N52xxB series was designed for precision voltage regulation in mission-critical analog subsystems where JEDEC compliance, wide temperature operation, and hermetic reliability are mandatory.

FAQ

What is the nominal Zener voltage and tolerance of the 1N5223B?

The 1N5223B has a nominal Zener voltage of 2.7 V with a guaranteed tolerance of ±5% at 20 mA test current and 25°C ambient. This means its actual regulation voltage falls between 2.565 V and 2.835 V under those conditions, making it suitable for applications requiring moderate precision without active trimming.

Does the 1N5223B have a positive or negative temperature coefficient?

1N5223B has a negative temperature coefficient of –0.080 %/°C, meaning its Zener voltage decreases slightly as temperature increases. This behavior is confirmed in Note 3 of the datasheet for devices 1N5221B through 1N5242B, and must be accounted for in thermal error budgets for precision references.

What package type and mounting configuration does the 1N5223B use?

The 1N5223B uses a DO-35 (DO-204AH) hermetically sealed glass axial-leaded package with cathode identified by a band. It is designed for through-hole mounting with minimum 10 mm lead length from the body to meet thermal resistance specifications of 250 °C/W junction-to-lead.

Can the 1N5223B be used in surface-mount designs?

No - the 1N5223B is strictly a through-hole axial-leaded device in DO-35 package. For surface-mount equivalents, Microsemi offers the MLL5223B in DO-213AA (MELF) package; this is a distinct orderable part with identical electrical specs but different mechanical form factor and soldering requirements.

What is the maximum power dissipation and thermal derating behavior of the 1N5223B?

The 1N5223B is rated for 500 mW at 25°C, with linear derating to zero power at 175°C ambient (per Figure 1). At 50°C lead temperature, its steady-state power drops to 0.5 W; on FR4 board with specified copper pads, it delivers 0.48 W at 25°C ambient, reflecting real-world PCB thermal constraints.