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STMicroelectronics SM15T100A
- Part No.:
- SM15T100A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T100A.pdf
- Description:
- TVS DIODE 85.5VWM 178VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:425
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Product details
Overview
SM15T100A from STMicroelectronics is a unidirectional 1500 W transient voltage suppression diode in SMC package, designed for IEC 61000-4-2 ESD (30 kV air/contact) and IEC 61000-4-4 surge (4 kV level 4) protection. It features 100 V standoff voltage (VRM), 137 V clamping voltage at 56 A (8/20 µs), and 0.2 µA leakage at 25 °C, enabling robust overvoltage protection in high-reliability power supply inputs.
For engineers reviewing the SM15T100A datasheet, SM15T100A pinout, SM15T100A application, or SM15T100A equivalent, this device is selected for high-junction-temperature (150 °C), low-leakage TVS roles in AC/DC front-end stages, telecom line interfaces, and industrial DC bus protection where stable clamping and minimal standby current are critical.
Technical Context
The SM15T100A uses planar junction silicon technology to achieve low dynamic resistance (1.30 Ω at 8/20 µs) and temperature-stable breakdown behavior (αT = 10.6 × 10⁻⁴ /°C). Its unidirectional configuration supports DC-biased circuits with reverse-blocking capability up to 100 V.
It delivers 1500 W peak pulse power (10/1000 µs) at 25 °C, derating to 1250 W at Tj = 150 °C per Figure 3, and sustains 178 A surge current (8/20 µs) while maintaining clamping below 137 V - enabling coordination with downstream ICs rated for ≤150 V absolute maximum.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 100 V - maximum continuous reverse operating voltage before conduction begins; sets minimum system DC rail rating. |
| Breakdown Voltage (VBR) | 95.0 V (typ.) at 1 mA - precise threshold for initiating avalanche clamping during transients. |
| Clamping Voltage (VCL) | 137 V at 56 A (8/20 µs) - peak voltage seen by protected circuit under worst-case surge; ensures <150 V stress on downstream components. |
| Peak Pulse Power (PPP) | 1500 W (10/1000 µs) - energy-handling capacity for long-duration surges like lightning-induced ring waves. |
| Leakage Current (IRM) | 0.2 µA at 25 °C - negligible standby power loss in high-impedance sensing or battery-backed circuits. |
| Junction Temperature Range | −55 to +150 °C - enables operation in enclosed industrial enclosures without forced cooling. |
| Dynamic Resistance (RD) | 1.30 Ω - low impedance during clamping minimizes voltage overshoot and improves current-sharing predictability. |
Pinout & Package
SM15T100A is housed in an SMC (DO-214AB) surface-mount package measuring 7.75–8.15 mm × 5.55–6.25 mm × 2.45 mm max height, with matte tin-plated leads compliant with J-STD-002 and IPC7531 footprint standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked band) | Surge current sink node | Connected to protected line; conducts avalanche current to ground during overvoltage events. |
| Anode | Reference/ground return path | Typically tied to system ground or low-impedance return plane; completes clamping current loop. |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 ESD immunity | 30 kV air/contact discharge - exceeds Level 4, eliminating need for external ESD filters in front-end interfaces. |
| Low temperature coefficient (αT) | 10.6 × 10⁻⁴ /°C - ensures predictable VBR shift across −55 to +150 °C, simplifying thermal margining. |
| High surge current capability | 178 A (8/20 µs) - handles fast-rising transients from inductive switching or nearby lightning strikes. |
| UL 497B certification | File QVGQ2.E136224 - validates suitability for telecom and industrial signal line protection per safety standards. |
| MSL Level 1 rating | Unlimited floor life at ≤30 °C/85 % RH - eliminates bake requirements prior to reflow assembly. |
Applications
| AC/DC Power Supply Input | Industrial PLC Digital I/O |
|---|---|
|
Use Scenario: Protection of rectified AC input stage against line-to-line surges and differential-mode transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between L/N and ground to clamp common-mode surges before bridge rectifier. Use Value: 137 V clamping ensures rectifier diodes (e.g., 200 V PIV) remain within safe SOA during 4 kV IEC 61000-4-4 events. |
Use Scenario: Surge protection on 24 V DC digital input channels exposed to field wiring in factory automation. IC Role / Device Role / Timing Role: Standoff-rated TVS on each input pin to suppress inductive kickback from solenoid/relay coils. Use Value: 0.2 µA leakage prevents false triggering of optocoupler-based input detection circuits. |
| Telecom Line Interface | Motor Drive DC Bus |
|
Use Scenario: Protection of RS-485 transceiver lines connected to outdoor cabling subject to induced lightning currents. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional pair (with companion CA variant) on data lines referenced to local ground. Use Value: 1500 W pulse rating absorbs multi-kA surges without degradation, preserving signal integrity over 10+ years. |
Use Scenario: Overvoltage suppression on 300–400 V DC bus in variable-frequency drives during regenerative braking spikes. IC Role / Device Role / Timing Role: High-energy TVS placed across bus capacitors to clamp transient overvoltages exceeding 100 V. Use Value: 1250 W capability at 150 °C allows continuous operation in sealed drive enclosures without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ100A (Bourns) | Same 100 V VRM, but lower PPP = 600 W (10/1000 µs); higher VCL = 165 V at 36.3 A. | Limited to lower-energy surges; unsuitable for 4 kV IEC 61000-4-4 coordination without additional filtering. | Select when cost sensitivity outweighs surge margin and board space permits larger footprint. |
| P6SMB100A (Littelfuse) | Identical SMC package and 100 V VRM, but 1000 W PPP rating and 156 V VCL at 45.5 A (8/20 µs). | Requires tighter layout to manage higher clamping voltage; less margin for 150 V-rated downstream ICs. | Choose only if legacy qualification requires Littelfuse sourcing or dual-sourcing mandates cross-compatibility. |
Compared with SMBJ100A and P6SMB100A, SM15T100A delivers 2.5× higher pulse power and 13–22 V lower clamping at rated current - directly improving system-level surge immunity without adding series impedance or filtering complexity.
Availability
SM15T100A is available at Aetrix Electronics and suitable for AC/DC power supplies, industrial PLC I/O modules, and telecom line interface designs requiring stable component supply, long-lifecycle support, and certified surge immunity.
Supply support for SM15T100A 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, and protection devices for industrial, automotive, and consumer markets.
The SM15T series belongs to ST's high-power TVS portfolio, engineered specifically for robust front-end surge protection in harsh environments where reliability, temperature stability, and low leakage are non-negotiable.
FAQ
What is the maximum clamping voltage of SM15T100A under IEC 61000-4-4 4 kV testing?
The SM15T100A clamps to 137 V at 56 A (8/20 µs waveform), which corresponds to the peak current generated by a 4 kV IEC 61000-4-4 surge applied to a 50 Ω source impedance. This value is measured per Table 2 and confirmed in Figure 5, ensuring protected circuits see no more than 137 V during standardized surge events.
Can SM15T100A be used in bidirectional signal lines?
No - SM15T100A is unidirectional and must be used only in DC-biased applications where polarity is fixed. For bidirectional signal lines like RS-485 or USB, the companion SM15T100CA variant is required, as it provides symmetrical clamping in both directions without polarity constraints.
How does SM15T100A perform at elevated junction temperatures?
At Tj = 150 °C, SM15T100A maintains 1250 W peak pulse power (10/1000 µs), retains 0.2 µA leakage (per Figure 9), and exhibits predictable VBR shift using αT = 10.6 × 10⁻⁴ /°C. Its derating curve (Figure 3) confirms full functionality across the entire −55 to +150 °C operating range.
Is SM15T100A RoHS and REACH compliant?
Yes - SM15T100A carries STMicroelectronics' ECOPACK2 designation, meeting RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Its matte tin lead finish and halogen-free molding compound are documented in DS0683 Rev 8, Section 2.1, and verified via ST's public compliance portal.
SM15T100A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- SM15T, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 85.5V
- Voltage - Breakdown (Min):
- 95V
- Voltage - Clamping (Max) @ Ipp:
- 178V
- Current - Peak Pulse (10/1000µs):
- 56A (8/20µs)
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
SM15T100A FAQ
1.How can I place an order for SM15T100A through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T100A 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 SM15T100A reliable?
The price and inventory of SM15T100A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T100A is usually 5 days.
3.What payment methods are accepted for SM15T100A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T100A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T100A?
SM15T100A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T100A 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 SM15T100A?
For technical support, including SM15T100A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T100A requirements.
6.How does Aetrix verify that SM15T100A is sourced from the original manufacturer or authorized distributors?
All SM15T100A 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 SM15T100A meets industry standards.
7.What is the process for return or replacement of SM15T100A?
All SM15T100A units undergo pre-shipment inspection (PSI). If there is an issue with SM15T100A, 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 SM15T100A part is unused and in its original packaging.
Return procedure for SM15T100A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T100A Tags
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