Microchip Technology 1N5274B/TR

Overview

1N5274B/TR from Microsemi is a 500 mW, 130 V ±5% glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for -65°C to +175°C operation, with 0.1 μA max reverse current at 104 V and 94 Ω zener impedance at 0.25 mA test current. It serves as a precision voltage reference or overvoltage clamp in industrial power supplies and sensor signal conditioning circuits.

For engineers reviewing the 1N5274B/TR datasheet, 1N5274B/TR pinout, 1N5274B/TR application, or 1N5274B/TR equivalent, key selection criteria include its 130 V nominal Zener voltage, ±5% tolerance (B suffix), 0.5 W power rating at 25°C, DO-35 mechanical form factor, and temperature coefficient of +0.110 %/°C - all critical for high-temperature stable regulation in aerospace and downhole electronics.

Technical Context

This device operates in reverse-bias breakdown mode to maintain a stable 130 V reference across a wide current range (0.25 mA to 9.5 mA). Its DO-35 hermetically sealed glass package ensures reliability under thermal cycling and radiation exposure, with inherent radiation hardness per MicroNote 050.

The 1N5274B/TR exhibits a positive temperature coefficient (+0.110 %/°C), indicating increasing Zener voltage with rising junction temperature - a design consideration for closed-loop feedback stability in high-accuracy voltage monitors and analog front-end protection circuits.

Key Specifications

Pinout & Package

DO-35 (DO-204AH) hermetically sealed glass axial-leaded package with cathode indicated by color band; designed for through-hole mounting with 3/8" (10 mm) lead length from body for thermal management.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5274A/TR and MMBZ5274B-7-F, the 1N5274B/TR delivers tighter voltage tolerance in a through-hole package optimized for high-reliability thermal cycling and radiation environments - making it preferred for aerospace, downhole, and military applications where long-term stability under stress is non-negotiable.

Availability

1N5274B/TR is available at Aetrix Electronics and suitable for high-temperature power supplies, aerospace voltage monitors, and downhole sensor conditioning requiring stable component supply across extended product lifecycles.

Supply support for 1N5274B/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 analog and mixed-signal components for aerospace, defense, and industrial markets.

The 1N52xxB series was engineered for precision voltage regulation in harsh-environment applications, emphasizing radiation hardness, wide temperature operation, and JEDEC-standardized interchangeability across military and commercial grades.

FAQ

What is the nominal Zener voltage and tolerance of the 1N5274B/TR?

The 1N5274B/TR has a nominal Zener voltage of 130 V with a ±5% tolerance, as indicated by the "B" suffix per JEDEC standard. This means the actual breakdown voltage falls between 123.5 V and 136.5 V at 9.5 mA test current and 25°C ambient. The 1N5274B/TR maintains this specification across its full operating temperature range of -65°C to +175°C, with voltage drift compensated by its +0.110 %/°C temperature coefficient.

What package type and mounting style does the 1N5274B/TR use?

The 1N5274B/TR uses a DO-35 (DO-204AH) hermetically sealed glass axial-leaded package, designed for through-hole mounting. Its cathode is marked by a visible band, and optimal thermal performance requires a minimum 3/8" (10 mm) lead length from the glass body. The 1N5274B/TR weighs 0.2 grams and features tin-lead or RoHS-compliant matte-tin plating compatible with standard soldering processes up to 260°C for 10 seconds.

How does the 1N5274B/TR perform under high-temperature conditions?

The 1N5274B/TR is rated for continuous operation from -65°C to +175°C, with power dissipation derated linearly above 25°C per Figure 1 in the datasheet. At 100°C lead temperature, its power capability drops to approximately 300 mW. Its inherent radiation hardness (per MicroNote 050) and ESD insensitivity (MIL-STD-750 Method 1020) make the 1N5274B/TR especially robust in thermally stressed environments such as turbine controllers and downhole electronics.

What is the Zener impedance and why does it matter for the 1N5274B/TR?

The 1N5274B/TR has a Zener impedance (ZZK) of 94 Ω measured at 0.25 mA, reflecting its dynamic resistance near the breakdown knee. This value directly affects regulation stability: lower impedance yields smaller output voltage variation under changing load current. For the 1N5274B/TR, 94 Ω ensures predictable clamping behavior in transient suppression and reference applications - particularly important in motor drive gate protection and precision analog monitoring circuits.

Can the 1N5274B/TR be used as a direct replacement for other 1N52xx series diodes?

The 1N5274B/TR is functionally interchangeable with other 1N52xxB devices only when matching nominal voltage (130 V), tolerance (±5%), and package (DO-35). It is not a drop-in replacement for A-suffix (±10%) or C/D-suffix (±2%/±1%) variants due to differing voltage accuracy. While pin-compatible with all DO-35 Zeners, the 1N5274B/TR's specific 130 V rating and +0.110 %/°C tempco require verification against system-level voltage drift budgets before substitution.