STMicroelectronics SMC30J36A

Overview

SMC30J36A from STMicroelectronics is a unidirectional transient voltage suppression (TVS) diode designed for primary-level surge protection in DC power lines and signal interfaces. It delivers 3000 W peak pulse power (10/1000 μs), clamps at 58.1 V under 48.4 A surge current, and features 0.2 µA max leakage at 25 °C and 175 °C max operating junction temperature - enabling robust ESD and EFT protection in industrial power supplies and automotive body electronics.

For engineers reviewing the SMC30J36A datasheet, SMC30J36A pinout, SMC30J36A application, or SMC30J36A equivalent, key selection criteria include its 36 V standoff voltage, low dynamic resistance (63.2 mΩ), IEC 61000-4-2 ±30 kV contact/air discharge compliance, and SMC package compatibility with high-reliability SMPS and automotive ECUs requiring stable clamping over temperature.

Technical Context

The SMC30J36A employs planar silicon avalanche technology to achieve precise breakdown at 40–44.2 V (V_BR min–max @ 1 mA), with thermal coefficient α_T = 10 × 10⁻⁴/°C enabling predictable V_BR and V_CL drift across −55 °C to +175 °C. Its unidirectional configuration supports anode-to-cathode surge conduction only, eliminating reverse-bias leakage concerns in DC-biased rails.

Clamping performance is defined by V_CL = 58.1 V at I_PP = 48.4 A (10/1000 μs), derived from V_BR(max) + R_D × I_PP, where R_D = 63.2 mΩ. This low dynamic resistance ensures minimal voltage overshoot during fast transients, critical for safeguarding 3.3 V–24 V logic interfaces and microcontroller I/O pins.

Key Specifications

Pinout & Package

The SMC30J36A is housed in a JEDEC-registered SMC (DO-214AB) surface-mount package with matte tin-plated leads, optimized for automated assembly and thermal dissipation on FR4 PCBs with recommended 3.14 cm² copper area per lead.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar TVS diode applications.

Compared with SMBJ36A and 1.5KE36A, the SMC30J36A provides 5× higher surge power handling, 3.7× lower clamping voltage at rated current, and SMT scalability - making it the optimal choice for next-generation automotive and industrial systems demanding both miniaturization and ruggedness.

Availability

SMC30J36A is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, telecom remote radio units, and medical infusion pump power inputs requiring stable component supply across extended temperature and high-surge environments.

Supply support for SMC30J36A 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering innovative solutions across automotive, industrial, and power management domains.

The SMC30J TVS series targets high-reliability DC protection in harsh environments, with design focus on low leakage, high-temperature stability, and IEC/ISO-compliant surge resilience for automotive and industrial end equipment.

FAQ

What is the maximum surge current the SMC30J36A can withstand?

The SMC30J36A handles up to 48.4 A peak pulse current (10/1000 μs waveform) at a clamping voltage of 58.1 V. For shorter 8/20 μs transients, it supports up to 287 A - verified per IEC 61000-4-5 test conditions and documented in DS8598 Rev 8 Table 2.

Is the SMC30J36A compatible with lead-free reflow soldering?

Yes - the device uses matte tin-plated leads and complies with J-STD-020 MSL Level 1. Its recommended reflow profile peaks at 240–245 °C for 60 seconds max, matching standard Pb-free SAC305 processes without requiring pre-baking or special handling.

How does temperature affect the clamping voltage of the SMC30J36A?

V_CL increases linearly with junction temperature at α_T = 10 × 10⁻⁴/°C. At 150 °C, V_CL rises to approximately 61.5 V (58.1 V × [1 + 0.001 × (150 − 25)]), remaining within safe margins for 24 V systems with adequate design margin.

Can the SMC30J36A be used in bidirectional signal lines?

No - the 'A' suffix denotes unidirectional configuration, conducting only from cathode to anode. For bidirectional protection (e.g., RS-485, CAN), use the SMC30J36CA variant, which provides symmetrical clamping for both polarities and is marked '3BAQ' per Table 6.