Taiwan Semiconductor Corporation SMBJ36C

Overview

SMBJ36C from Taiwan Semiconductor is a bi-directional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, rated for 600W peak pulse power, 36V working stand-off voltage (VWM), and clamps transients to ≤64.3V at 9.8A peak impulse current. It protects automotive and industrial power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b surges.

For engineers reviewing the SMBJ36C datasheet, SMBJ36C pinout, SMBJ36C application, or SMBJ36C equivalent, key selection criteria include bidirectional clamping capability, 1.0ps response time, <1μA leakage above 10V, UL 94V-0 molding compound, and JESD201 Class 2 whisker resistance - all validated for ESD and electrical fast transient (EFT) immunity in harsh environments.

Technical Context

The SMBJ36C employs a glass-passivated silicon junction optimized for low capacitance and fast transient response. Its bi-directional configuration enables symmetrical clamping in AC-coupled or floating signal/power lines without polarity concerns.

Designed per ANSI/IEEE C62.35, it delivers 600W non-repetitive peak pulse power under 10/1000µs waveform, with thermal resistance R_θJA = 55°C/W and R_θJC = 10°C/W, supporting reliable operation up to +150°C junction temperature.

Key Specifications

Pinout & Package

DO-214AA (SMB) surface-mount package with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance; UL 94V-0 flammability rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ36C, SMBJ36CA offers AEC-Q101 validation for automotive use cases requiring formal qualification evidence, while P6SMB36CA provides proven field reliability in industrial programmable logic controllers where qualification documentation depth is less critical than supply chain stability.

Availability

SMBJ36C is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, LED driver input stage safeguarding, and smart meter AC mains surge suppression requiring stable component supply and full traceability.

Supply support for SMBJ36C 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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs, with global distribution and AEC-Q101 qualified product lines.

The SMBJ series was developed specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing fast response, low leakage, and robust package construction for automated SMT assembly.

FAQ

What is the clamping voltage of SMBJ36C at its rated peak pulse current?

The SMBJ36C clamps to a maximum of 64.3 V when subjected to its rated peak impulse current of 9.8 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuits during surge events. The SMBJ36C maintains this clamping performance consistently across its specified operating temperature range of –55°C to +150°C.

Is SMBJ36C unidirectional or bidirectional, and how is polarity marked?

SMBJ36C is a bi-directional TVS diode, indicated by the "C" suffix per Taiwan Semiconductor's ordering convention. It has no functional anode or cathode - both terminals behave identically under reverse or forward surge conditions. The device uses a single cathode band marking per DO-214AA mechanical drawing, but this mark does not indicate polarity for clamping; it reflects manufacturing orientation only. The SMBJ36C delivers symmetrical clamping in either direction.

Does SMBJ36C meet automotive transient immunity standards?

Yes, SMBJ36C meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (supply line interruption), Pulse 3a (capacitive coupled EFT), and Pulse 3b (power line EFT). These tests validate its suitability for 12V and 24V automotive subsystems. The SMBJ36C achieves this with its 600W peak pulse rating, sub-1µA leakage, and 1.0ps response time - all confirmed in Taiwan Semiconductor's R2104 datasheet.

What is the maximum steady-state power dissipation of SMBJ36C at room temperature?

The SMBJ36C has a steady-state power dissipation (P_D) rating of 3 W at T_A = 25°C, as specified in its Absolute Maximum Ratings table. This value applies only to continuous DC or low-frequency conditions - not transient suppression. In normal operation, the SMBJ36C draws negligible current below 36V, so actual power dissipation remains near zero. The 3 W rating supports safe derating margins during rare sustained overvoltage conditions.

Can SMBJ36C be used in place of SMBJ36A in a design?

No - SMBJ36C and SMBJ36A are not interchangeable. SMBJ36C is bi-directional (suitable for AC or floating lines); SMBJ36A is unidirectional with defined anode/cathode and lower forward voltage (VF = 3.5 V). Substituting SMBJ36C for SMBJ36A may cause unintended conduction in DC-biased circuits. Always verify polarity requirements and consult the SMBJ36C datasheet section "Devices for Bipolar Applications" before replacement.