Microchip Technology 1N5223A

Overview

1N5223A from Microsemi is a 2.7 V, ±10% 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 1N5223A datasheet, 1N5223A pinout, 1N5223A application, or 1N5223A equivalent, key selection criteria include its 2.7 V nominal Zener voltage, ±10% tolerance (A suffix), 500 mW power rating at 25°C, DO-35 mechanical form factor, and temperature coefficient of –0.080 %/°C - all critical for stable low-voltage regulation in industrial and aerospace designs.

Technical Context

The 1N5223A operates as a reverse-biased silicon Zener diode with sharp breakdown knee, specified at 20 mA test current (IZT) and 0.25 mA knee current (IZK). Its 1300 Ω dynamic impedance (ZZT) at IZK and 75 Ω at IZT ensures predictable regulation under varying load conditions.

Designed for axial-leaded through-hole mounting, it features hermetically sealed glass construction, tin-lead or RoHS-compliant matte-tin plating, and cathode identification via band. Its –0.080 %/°C temperature coefficient supports stable performance across –65°C to +175°C ambient range without external compensation.

Key Specifications

Pinout & Package

DO-35 (DO-204AH) glass axial-lead package: hermetically sealed cylindrical body, 0.2 g mass, tin-lead or RoHS-compliant matte-tin plating, cathode indicated by color band. Mounting requires 3/8″ (10 mm) lead length from body for rated thermal resistance (250 °C/W junction-to-lead).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4728A and BZX55C2V7, the 1N5223A offers optimal trade-off between low-voltage capability (2.7 V), JEDEC-standardized DO-35 fit, and robust high-temperature operation up to +175°C - making it preferred for compact, high-reliability analog regulation where voltage headroom is constrained.

Availability

1N5223A is available at Aetrix Electronics and suitable for industrial sensor conditioning, aerospace power monitoring, and military radio bias networks requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 1N5223A 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 1N52xxA series belongs to Microsemi's legacy DO-35 Zener diode product line, engineered for precision voltage regulation in mission-critical systems where wide temperature operation, ESD immunity, and radiation hardness are mandatory design requirements.

FAQ

What is the nominal Zener voltage and tolerance of the 1N5223A?

The 1N5223A has a nominal Zener voltage of 2.7 V at 20 mA test current (IZT), with a guaranteed tolerance of ±10% as indicated by the "A" suffix. This tolerance defines the allowable deviation from 2.7 V under specified operating conditions and is verified per JEDEC standards for the 1N5221–1N5281B family. The 1N5223A maintains this specification across its full –65°C to +175°C operating temperature range.

What package type and mounting requirements apply to the 1N5223A?

The 1N5223A uses the DO-35 (DO-204AH) glass axial-lead package with hermetically sealed construction and cathode identified by a band. For rated thermal performance, it requires a minimum 3/8″ (10 mm) lead length from the body to achieve 250 °C/W junction-to-lead thermal resistance. Soldering must not exceed 260°C for 10 seconds to avoid glass seal damage.

How does the temperature coefficient of the 1N5223A affect its regulation stability?

The 1N5223A has a temperature coefficient (αVZ) of –0.080 %/°C, meaning its Zener voltage decreases by approximately 2.16 mV per °C rise from 25°C. This predictable negative drift allows designers to compensate system-level offsets or select complementary components. The coefficient is measured from 25°C to 125°C at 7.5 mA, ensuring stability in high-temperature industrial and aerospace applications where the 1N5223A operates.

Can the 1N5223A be used in surface-mount designs?

No - the 1N5223A is exclusively a through-hole axial-leaded device in DO-35 package and is not compatible with surface-mount assembly. Microsemi offers surface-mount equivalents under the MLL52xxB series in DO-213AA (MELF) package, but those are distinct orderable parts with different marking, thermal behavior, and reflow profiles. Substituting 1N5223A into SMT layouts would require mechanical adaptation and invalidate thermal and reliability validation.

What is the maximum reverse leakage current specification for the 1N5223A?

The 1N5223A specifies a maximum reverse leakage current (IR) of 150 μA at VR = 1.0 V, per the Electrical Characteristics table. This value reflects the diode's blocking capability well below its Zener knee and is critical for low-power standby circuits where quiescent current must remain below microampere thresholds. Leakage remains within this limit across the full –65°C to +175°C operating range.