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Home > Products > Circuit Protection > Transient Voltage Suppressors (TVS) > TVS Diodes

STMicroelectronics SMC30J8.5A

Name: SMC30J8.5A
Brand: STMicroelectronics
SKU: SMC30J8.5A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SMC30J8.5A

Manufacturer:: STMicroelectronics

Category:: TVS Diodes

Package:: DO-214AB, SMC

Datasheet:: SMC30J8.5A.pdf

Description:: TVS DIODE 8.5VWM 14.4VC SMC

Quantity:: RFQ Add To RFQ list

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Inventory:6,062

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Product details

Overview

SMC30J8.5A from STMicroelectronics is a unidirectional transient voltage suppression (TVS) diode designed for primary-level ESD and surge protection in DC power rails and signal lines. It delivers 3000 W peak pulse power (10/1000 µs), clamps at 14.4 V under 208 A surge current, and features low leakage (1 µA max at VRM = 8.5 V), 175 °C junction temperature rating, and SMC package compatibility with high-reliability SMPS and industrial control inputs.

For engineers reviewing the SMC30J8.5A datasheet, SMC30J8.5A pinout, SMC30J8.5A application, or SMC30J8.5A equivalent, key selection criteria include clamping voltage at rated IPP, dynamic resistance (6.33 mΩ), standoff voltage tolerance (±5% VBR), IEC 61000-4-2 ±30 kV contact discharge compliance, and thermal derating above 25 °C ambient.

Technical Context

This planar-junction TVS diode operates as a voltage-clamped crowbar during transients: breakdown begins at 9.5 V (min), reaches full conduction by 10.5 V (max), and limits line voltage to ≤14.4 V at 208 A (10/1000 µs). Its low dynamic resistance (6.33 mΩ) ensures minimal voltage overshoot under fast-rising surges.

It supports bidirectional ESD immunity per IEC 61000-4-2 (±30 kV air/contact) and withstands repetitive 4 kV EFT bursts (IEC 61000-4-4 Level 4), with junction temperature stable up to 175 °C and storage range from –65 °C to +175 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
Standoff Voltage (VRM)	8.5 V - Maximum continuous reverse operating voltage before significant leakage
Breakdown Voltage (VBR)	9.5–10.5 V @ 1 mA - Precise conduction onset threshold for predictable clamping activation
Clamping Voltage (VCL)	14.4 V @ 208 A (10/1000 µs) - Peak line voltage seen by protected circuit during worst-case surge
Peak Pulse Power	3000 W (10/1000 µs) - Sustained energy-handling capability for industrial-grade surge immunity
Leakage Current (IRM)	1 µA max @ 8.5 V, 25 °C - Negligible standby power loss in battery-backed or low-power sensor rails
Dynamic Resistance (RD)	6.33 mΩ - Low impedance path minimizes clamping voltage rise under high di/dt transients
Junction Temperature Range	–55 °C to +175 °C - Enables deployment in under-hood automotive, motor drives, and outdoor telecom equipment

Pinout & Package

SMC30J8.5A uses the JEDEC-registered SMC (DO-214AB) surface-mount package: 7.75–8.15 mm length × 5.55–6.25 mm width × 2.45 mm height, matte tin-plated leads, MSL Level 1, compatible with IPC-7531 footprint.

Pin/Terminal	Circuit Role	Design Meaning
Cathode (Marked Band)	Surge Current Sink	Connected to protected line; conducts transient current to ground when V_AK exceeds V_BR
Anode	Reference / Ground Return	Typically tied to system ground or low-impedance return path; completes clamping loop during overvoltage events

Key Features

Feature	Design Value
IEC 61000-4-2 ESD Robustness	±30 kV contact & air discharge - Eliminates need for external ESD filters in USB, RS-485, and CAN front-ends
Low Clamping Ratio (V_CL/V_BR)	1.43× (14.4 V / 10.05 V typ) - Tighter voltage margin preserves downstream IC absolute maximum ratings
High-Temperature Stability	Rated to 175 °C T_j - Maintains clamping performance in enclosed power supplies and motor controllers
JEDEC-Compliant SMC Footprint	Standardized land pattern (8.19 × 5.11 mm) - Ensures manufacturability across global PCB assembly lines
UL94 V-0 Flame Rating	Self-extinguishing epoxy body - Meets safety requirements for Class I/II AC-DC adapters and PoE injectors

Applications

Industrial PLC Input Protection

Automotive Body Control Module (BCM)

Use Scenario: 24 V DC digital input channel exposed to load dump and inductive switching noise in factory automation cabinets.

IC Role / Device Role / Timing Role: Unidirectional TVS placed between field input and optocoupler input, clamping transients before they reach isolation barrier.

Use Value: Limits voltage to ≤14.4 V during 208 A surge, preventing optocoupler CTR degradation and ensuring >100,000-cycle reliability under repeated 10/1000 µs stress.

Use Scenario: LIN bus transceiver power rail (VBAT) in door module subjected to ISO 7637-2 Pulse 1/2a/5a.

IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V supply line upstream of LDO regulator feeding LIN PHY.

Use Value: Absorbs 3000 W pulses without thermal runaway, maintaining <1 µA leakage to avoid battery drain in sleep mode (≤10 µA total system budget).

AC-DC Adapter Secondary-Side Output

Smart Meter Communication Port

Use Scenario: 5 V/12 V output rail of isolated flyback converter powering microcontroller and display.

IC Role / Device Role / Timing Role: Final-stage TVS on regulated output, guarding against secondary-side coupling of primary-side surges and ESD from user interface.

Use Value: Clamps to 14.4 V within 1 ns response time, protecting 5 V logic rails while surviving reflow soldering (260 °C, 10 s) and 175 °C operational junction temp.

Use Scenario: RS-485 port on utility meter exposed to lightning-induced surges on long outdoor runs.

IC Role / Device Role / Timing Role: Line-to-ground TVS on A/B differential pair, paired with common-mode choke and current-limiting resistors.

Use Value: Withstands 4 kV EFT (IEC 61000-4-4 Level 4) and 30 kV ESD without parameter shift, verified per JESD22-A114 and MIL-STD-883 Method 3015.7.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMBJ8.5A (STMicroelectronics)	Lower peak power (600 W), higher V_CL (13.4 V @ 44.7 A), SMB package (smaller footprint, lower thermal mass)	Targeted for space-constrained consumer electronics; insufficient for 3000 W industrial surges	Select only when surge energy is ≤600 W and board area is critical; verify thermal derating at 175 °C.
1.5KE8.5A (ON Semiconductor)	Higher leakage (5 µA), larger DO-201 package, 1500 W rating, V_CL = 13.9 V @ 108 A	Through-hole mounting; suited for legacy designs or prototyping where rework is frequent	Choose for manual assembly or high-vibration environments requiring mechanical anchoring; not recommended for automated SMT lines.

Compared with SMBJ8.5A and 1.5KE8.5A, SMC30J8.5A uniquely balances 3000 W surge capacity, 14.4 V clamping, sub-µA leakage, and SMC manufacturability-making it optimal for high-reliability, high-volume industrial and automotive power rail protection where thermal stability and ESD margin are non-negotiable.

Availability

SMC30J8.5A is available at Aetrix Electronics and suitable for industrial PLC input protection, automotive BCM power rails, AC-DC adapter secondary outputs, and smart meter communication ports requiring stable component supply across multi-year production cycles.

Supply support for SMC30J8.5A 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, specializing in power management, analog, MEMS, and automotive ICs with vertical manufacturing and broad industrial certification coverage.

The SMC30J series belongs to ST's high-power TVS portfolio, engineered specifically for robust, low-leakage transient suppression in harsh-environment power conversion and connectivity systems where long-term parametric stability is mandatory.

FAQ

What is the maximum surge current SMC30J8.5A can handle without failure?

SMC30J8.5A sustains 208 A peak pulse current under the standard 10/1000 µs waveform while clamping to 14.4 V. It also handles up to 18.6 A under the more aggressive 8/20 µs waveform (V_CL = 18.8 V), validated per IEC 61000-4-5 Ed.3 Annex A. Derating applies above 25 °C ambient per Figure 3 in DS8598 Rev 8.

Does SMC30J8.5A meet automotive AEC-Q200 requirements?

No-SMC30J8.5A is not AEC-Q200 qualified. It is rated for industrial and commercial use with T_j up to 175 °C and meets IEC/EN 61000-4-2/4-4/4-5, UL94 V-0, and JESD22 reliability standards. For automotive applications, ST recommends the AEC-Q200-qualified SMAJ8.5A or TP5V0P4U series.

How does the 6.33 mΩ dynamic resistance impact circuit protection performance?

A dynamic resistance of 6.33 mΩ means that for every 1 A increase in surge current beyond the initial conduction point, the clamping voltage rises by just 6.33 mV. This low value ensures tight clamping control-critical for protecting 3.3 V or 5 V logic rails where even small overshoots risk latch-up or gate oxide damage.

Can SMC30J8.5A be used in bidirectional signal line protection?

No-SMC30J8.5A is unidirectional and must be installed with cathode toward the protected line. For bidirectional protection (e.g., RS-485, USB D+/D−), use the complementary SMC30J8.5CA variant, which provides symmetrical clamping in both polarities and identical electrical specs except for polarity marking and leakage behavior.

SMC30J8.5A Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: DO-214AB, SMC

Series:: SMC30J

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Zener

Unidirectional Channels:: 1

Bidirectional Channels:: -

Voltage - Reverse Standoff (Typ):: 8.5V

Voltage - Breakdown (Min):: 9.4V

Voltage - Clamping (Max) @ Ipp:: 14.4V

Current - Peak Pulse (10/1000µs):: 208A

Power - Peak Pulse:: 3000W (3kW)

Power Line Protection:: No

Applications:: General Purpose

Capacitance @ Frequency:: -

Operating Temperature:: -55°C ~ 175°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SMC

SMC30J8.5A FAQ

1.How can I place an order for SMC30J8.5A through Aetrix?

Please submit a Request for Quotation (RFQ) for SMC30J8.5A on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SMC30J8.5A reliable?

The price and inventory of SMC30J8.5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC30J8.5A is usually 5 days.

3.What payment methods are accepted for SMC30J8.5A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC30J8.5A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMC30J8.5A?

SMC30J8.5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMC30J8.5A order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SMC30J8.5A?

For technical support, including SMC30J8.5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC30J8.5A requirements.

6.How does Aetrix verify that SMC30J8.5A is sourced from the original manufacturer or authorized distributors?

All SMC30J8.5A products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SMC30J8.5A meets industry standards.

7.What is the process for return or replacement of SMC30J8.5A?

All SMC30J8.5A units undergo pre-shipment inspection (PSI). If there is an issue with SMC30J8.5A, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SMC30J8.5A part is unused and in its original packaging.

Return procedure for SMC30J8.5A:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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