Microchip Technology 1N962B

Overview

1N962B from Microsemi is a silicon 500 mW axial-leaded Zener diode in DO-35 (DO-204AH) package, rated for 11 V nominal Zener voltage at 11.5 mA test current, with ±5% tolerance (B suffix), 700 Ω dynamic impedance at I_ZT, and +0.076 %/°C temperature coefficient. It regulates voltage in low-power reference and protection circuits across industrial temperature range.

For engineers reviewing the 1N962B datasheet, 1N962B pinout, 1N962B application, or 1N962B equivalent, key selection criteria include its 11 V regulation point, 32 mA maximum DC Zener current, 175 mA surge capability, -65°C to +175°C operating range, and DO-35 mechanical compatibility with through-hole PCB layouts.

Technical Context

The 1N962B operates as a reverse-biased voltage reference device, maintaining stable 11 V output across 1–32 mA operating current with minimal voltage drift due to its +0.076 %/°C tempco. Its 700 Ω Zener impedance at 11.5 mA ensures predictable regulation under varying load conditions.

Designed for axial-leaded mounting, it features hermetically sealed glass DO-35 construction, tin-lead or RoHS-compliant matte-tin plating, cathode band polarity marking, and 0.2 g mass. Thermal resistance is 250 °C/W junction-to-lead (3/8″ lead length) and 310 °C/W junction-to-ambient on FR4.

Key Specifications

Pinout & Package

Package: DO-35 (DO-204AH), hermetically sealed axial-leaded glass body, cathode indicated by colored band, tin-lead or RoHS-compliant matte-tin plating, 0.2 g weight.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N962B, the 1N4740A offers lower voltage and higher package profile but wider current margin, while BZX55C11 delivers tighter regulation via lower Z_ZT in identical DO-35 form factor-making it a drop-in upgrade for noise-sensitive references.

Availability

1N962B is available at Aetrix Electronics and suitable for industrial power supplies, automotive sensor interfaces, and military communication systems requiring stable component supply with long lifecycle visibility and RoHS-compliant variants (add "e3" suffix).

Supply support for 1N962B 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 aerospace, defense, and industrial markets.

The 1N962B belongs to Microsemi's legacy 1N957B–1N992B DO-35 Zener series, engineered for robust voltage regulation in harsh environments including extended temperature operation, ESD resilience, and radiation tolerance.

FAQ

What is the nominal Zener voltage and tolerance of the 1N962B?

The 1N962B has a nominal Zener voltage of 11 V with a ±5% tolerance, as indicated by the "B" suffix per JEDEC standard. This means its actual regulation voltage falls between 10.45 V and 11.55 V at 25°C under 11.5 mA test current. The tolerance is guaranteed across the full -65°C to +175°C operating temperature range, supporting reliable performance in demanding thermal environments.

What is the maximum steady-state power dissipation for the 1N962B?

The 1N962B is rated for 500 mW maximum steady-state power dissipation at lead temperature (T_L) < 50°C with 3/8″ (10 mm) lead length from the body. At ambient temperature (T_A) < 25°C on an FR4 board with specified copper pads, derated power is 480 mW. Derating follows the curve in Figure 1, reaching zero dissipation at 175°C T_L.

Does the 1N962B have RoHS-compliant packaging options?

Yes - the 1N962B is available in RoHS-compliant form by adding the "e3" suffix (e.g., 1N962Be3), which denotes annealed matte-tin plating compliant with EU RoHS Directive 2011/65/EU. Standard versions use tin-lead (Sn/Pb) plating per MIL-STD-750 Method 2026, and both variants share identical electrical and thermal specifications.

What is the thermal resistance specification for the 1N962B?

The 1N962B has a thermal resistance of 250 °C/W junction-to-lead (measured at 3/8″ lead length from body) and 310 °C/W junction-to-ambient when mounted on FR4 with 4 mm² copper pads and 1 mm track width. These values directly inform heatsinking requirements and safe operating area calculations for continuous or pulsed operation.

How does the temperature coefficient affect the 1N962B's regulation voltage?

The 1N962B has a positive temperature coefficient of +0.076 %/°C, meaning its Zener voltage increases by approximately 8.36 mV per °C rise above 25°C. For example, at 125°C, V_Z rises by ~7.6 V × 0.076 %/°C × 100°C = ~0.76 V, resulting in ~11.76 V regulation. This predictable drift enables compensation in precision reference designs.