onsemi 1N6271A

Overview

1N6271A from ON Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) diode designed for parallel clamping protection of sensitive electronics against ESD, lightning surges, and inductive switching transients. It features a working peak reverse voltage (VRWM) of 8.55 V, clamping voltage (VC) of 14.5 V at 103 A peak pulse current (IPP), and sub-1 ns response time. It is commonly deployed in DC power rail protection for industrial power supplies and communication interface circuits.

For engineers reviewing the 1N6271A datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, VRWM compatibility with steady-state operating voltage, surge current capability under IEC 61000-4-5 waveform conditions, and axial-leaded mechanical integration into legacy board layouts.

Technical Context

The 1N6271A operates as a silicon avalanche diode optimized for fast, low-impedance clamping during high-energy transients. Its breakdown voltage (VBR) is specified at 9.5–10.5 V (min–max) with 1 mA test current, and its dynamic impedance remains low across the full 103 A IPP range, enabling effective voltage limiting without thermal runaway.

It uses a Surmetic axial-leaded plastic package (Case 41A) with void-free thermosetting molding and Pb-free external lead finish. The device meets UL 497B for isolated loop circuit protection and carries Class 3 HBM ESD rating (>16 kV), confirming suitability for environments with frequent electrostatic discharge events.

Key Specifications

Pinout & Package

Package: Axial-leaded Surmetic plastic case (JEDEC Case 41A), cathode indicated by polarity band. Leads are solderable per 230°C/10 s specification at 1/16″ from case.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient voltage suppression applications.

Compared with SMBJ10A, the 1N6271A delivers 50% higher surge energy handling and 2.5 V lower clamping at rated current-critical for protecting 3.3 V/5 V logic rails. Compared with 1.5KE10A, it shares identical electrical behavior but differs only in JEDEC marking convention and packaging traceability; both are manufactured by ON Semiconductor under the same process flow.

Availability

1N6271A is available at Aetrix Electronics and suitable for industrial power supplies, RS-485 communication interfaces, medical auxiliary power systems, and point-of-sale terminal DC inputs requiring stable component supply and long-term obsolescence management.

Supply support for 1N6271A 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

ON Semiconductor (now part of onsemi) is a global supplier of energy-efficient semiconductor components, specializing in power management, analog, sensor, and discrete devices for automotive, industrial, and cloud infrastructure markets.

The 1N6271A belongs to the Mosorb 1500 W TVS family, engineered specifically for high-reliability, high-surge industrial and communications equipment where axial-leaded robustness and UL-recognized protection are mandatory design requirements.

FAQ

What is the maximum clamping voltage of the 1N6271A under surge conditions?

The 1N6271A has a maximum clamping voltage (VC) of 14.5 V when subjected to its rated peak pulse current of 103 A, measured using the 10/1000 µs standard surge waveform. This value is guaranteed across temperature and lifetime, ensuring downstream 16 V-rated ICs remain within safe operating limits during transient events. The 1N6271A achieves this via low dynamic impedance and controlled avalanche characteristics.

Is the 1N6271A RoHS compliant and lead-free?

Yes, the 1N6271A features a Pb-free external lead finish, fully compliant with the EU RoHS Directive 2011/65/EU. Its Surmetic axial package uses lead-free solderable terminations qualified for both wave and reflow soldering processes, with maximum lead temperature tolerance of 230°C for 10 seconds at 1/16 inch from the case. The 1N6271A does not contain exempted lead forms.

Can the 1N6271A be used in bidirectional protection circuits?

No, the 1N6271A is a unidirectional TVS diode and must be used with correct polarity-cathode toward the protected line, anode to ground. For bidirectional protection, ON Semiconductor offers the 1.5KE10CA (pin-compatible variant with "CA" suffix), which provides symmetrical clamping for AC-coupled or floating signal lines. Using 1N6271A in reverse-biased mode risks permanent breakdown above its 8.55 V VRWM.

What is the leakage current specification for the 1N6271A at its working voltage?

The 1N6271A exhibits a maximum reverse leakage current (IR) of 10 µA when biased at its working peak reverse voltage (VRWM) of 8.55 V, measured at 25°C. This low leakage ensures minimal power loss in always-on systems and avoids unintended loading of high-impedance bias networks-critical in precision analog and battery-backed applications where quiescent current must be tightly controlled.

Does the 1N6271A meet UL 497B certification for telecom protection?

Yes, the 1N6271A is UL Recognized under file QVGV2 to UL 497B for isolated loop circuit protection. This certification covers rigorous testing including strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge performance-validating its use in telecom central office equipment, DSLAMs, and industrial Ethernet switches where regulatory compliance is mandatory. The full 1N6267A series shares this recognition.