onsemi 1N6272AG

Overview

1N6272AG from ON Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) diode designed for parallel clamping protection of sensitive electronics against ESD, lightning-induced surges, and inductive switching transients. It features a 9.4 V working peak reverse voltage (VRWM), 11 V nominal breakdown voltage (VBR), 15.6 V maximum clamping voltage (VC) at 96 A peak pulse current (IPP), and sub-1 ns response time - deployed in power supply input stages, industrial I/O interfaces, and telecom line cards.

For engineers reviewing the 1N6272AG datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin over operating DC voltage, VC vs. protected IC's absolute maximum rating, surge current capability under system-level threat profiles, and UL 497B recognition for isolated loop circuit compliance.

Technical Context

The 1N6272AG operates as a silicon avalanche diode with sharp Zener-like breakdown characteristics, optimized for fast transient suppression in unidirectional configurations. Its low dynamic impedance (<1 Ω typical near VBR) ensures stable clamping under high di/dt events, while its thermally robust Surmetic axial package enables reliable heat dissipation during repetitive 1 ms pulses.

It complies with Class 3 ESD immunity (>16 kV HBM), meets UL 497B for isolated loop protection, and is rated for operation from −65°C to +175°C junction temperature. The device exhibits a positive temperature coefficient of VBR (+0.075 %/°C), enabling predictable voltage drift across temperature extremes without thermal runaway.

Key Specifications

Pinout & Package

1N6272AG uses the CASE 41A axial-leaded plastic package (Surmetic), with cathode identified by a colored band. Leads are tin-plated copper, solderable at 230°C for 10 seconds at 1/16″ from case body. Mounting position is unrestricted.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ10A, the 1N6272AG delivers 50% higher surge power and 1.4 V lower clamping at rated current - critical for protecting 12 V logic rails. Against 1.5KE11A, it offers identical protection performance with guaranteed Pb-free construction and traceable sourcing for modern production programs.

Availability

1N6272AG is available at Aetrix Electronics and suitable for industrial power supplies, RS-485 communication interfaces, and medical equipment requiring stable component supply with full RoHS compliance and UL recognition.

Supply support for 1N6272AG 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 semiconductor supplier specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and medical markets.

The 1N6272AG belongs to the Mosorb 1500 W TVS family, engineered specifically for high-reliability transient suppression in harsh environments where UL recognition, wide temperature operation, and repeatable clamping performance are mandatory.

FAQ

What is the maximum clamping voltage of the 1N6272AG under surge conditions?

The 1N6272AG has a maximum clamping voltage (VC) of 15.6 V when subjected to its rated peak pulse current of 96 A, measured per the 1 ms exponential waveform defined in Figure 5 of the datasheet. This value ensures protected circuits remain below typical 16 V absolute maximum ratings for 12 V logic and power ICs. The 1N6272AG maintains this clamping performance across its full operating temperature range and after repeated surges, provided thermal limits are observed.

Is the 1N6272AG RoHS compliant and lead-free?

Yes, the "G" suffix in 1N6272AG explicitly denotes a Pb-free package per J-STD-609, with matte tin-plated leads and halogen-free molding compound. It meets RoHS Directive 2011/65/EU and is qualified for lead-free reflow soldering up to 260°C peak temperature. The 1N6272AG replaces legacy 1N6272A in new designs requiring environmental compliance without sacrificing electrical or thermal performance.

Does the 1N6272AG require a series impedance for proper operation?

Yes, the 1N6272AG must be used with external series impedance (e.g., fuse, PTC, or resistor) to limit fault current during sustained overvoltage events. While it clamps fast transients effectively, continuous operation above VRWM will cause thermal runaway. For example, in a 24 V power rail, a 10 Ω resistor limits steady-state current to <2.4 A if the line rises to 25 V - well below the 5 W steady-state power rating. This protects both the 1N6272AG and downstream circuitry.

How does the 1N6272AG compare to bidirectional TVS diodes like 1N6272CA?

The 1N6272AG is unidirectional and only protects against positive-going transients relative to ground; it conducts in reverse bias and blocks forward current. In contrast, 1N6272CA (not a valid JEDEC part - correct designation is 1.5KE11CA) is bidirectional and protects both polarities, making it suitable for AC lines or differential data buses. The 1N6272AG offers lower capacitance and tighter VBR tolerance than its bidirectional counterpart, optimizing it for DC power rail protection where polarity is fixed.

What is the thermal resistance junction-to-lead (R_JL) of the 1N6272AG?

The 1N6272AG has a thermal resistance of 20°C/W from junction to lead, measured with 3/8″ lead length at TL = 75°C. This value enables direct thermal modeling of power dissipation during repetitive surges: for example, a 100 A, 1 ms pulse yields ~1.5 W average power, resulting in <30°C junction rise above lead temperature. Proper PCB copper pour under the leads further reduces effective R_θJA, supporting reliable operation in enclosed industrial enclosures.