My Inquiry
My Account
STMicroelectronics SM15T220A
- Part No.:
- SM15T220A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T220A.pdf
- Description:
- TVS DIODE 188VWM 388VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:1,118
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SM15T220A from STMicroelectronics is a unidirectional transient voltage suppression (TVS) diode in SMC package, designed for high-energy ESD and surge protection in power rails and signal lines. It delivers 1500 W peak pulse power (10/1000 µs), clamps at 328 V (max) under 26 A surge current, and operates up to 150 °C junction temperature - deployed in industrial power supplies and telecom interface protection.
For engineers reviewing the SM15T220A datasheet, SM15T220A pinout, SM15T220A application, or SM15T220A equivalent, key selection criteria include standoff voltage (220 V), low leakage (0.2 µA at 25 °C), dynamic resistance (6.04 Ω), IEC 61000-4-2 compliance (30 kV contact discharge), and thermal derating above 25 °C.
Technical Context
This TVS diode uses planar silicon technology to achieve stable breakdown behavior and low leakage across temperature. Its unidirectional configuration provides asymmetric clamping with forward conduction capability, enabling DC rail protection without reverse conduction path.
The device exhibits a temperature coefficient αT of 10.8 × 10−4/°C for both VBR and VCL, allowing accurate clamping voltage prediction over −55 °C to +150 °C. Dynamic resistance (RD = 6.04 Ω) governs voltage rise under fast transients, directly impacting protected circuit margin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 220 V - maximum continuous reverse operating voltage before significant leakage begins |
| Breakdown Voltage (VBR) | 188–209 V at 1 mA - precise threshold where avalanche conduction initiates reliably |
| Clamping Voltage (VCL) | 328 V max at 26 A (10/1000 µs) - peak voltage seen by protected circuit during surge |
| Peak Pulse Power (PPP) | 1500 W (10/1000 µs) - energy-handling capacity for standard lightning-surge waveforms |
| Leakage Current (IR) | 0.2 µA at 220 V, 25 °C - ensures minimal loading on high-impedance sensing or bias networks |
| Dynamic Resistance (RD) | 6.04 Ω - determines voltage overshoot slope during fast-rising transients (e.g., EFT) |
| Junction Temperature Range | −55 °C to +150 °C - supports operation in enclosed industrial enclosures without forced cooling |
Pinout & Package
SM15T220A is housed in an SMC (DO-214AB) surface-mount package with two terminals: cathode (marked band) and anode. The package meets IPC7531 footprint standards and JEDEC registered outline, optimized for thermal dissipation on FR4 PCBs with ≥3 cm² copper area per lead.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink terminal | Connected to protected line; conducts avalanche current to ground when VIN exceeds VBR |
| Anode | Reference/return path | Typically tied to system ground or lower-potential rail; completes conduction path during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 ESD immunity | 30 kV air/contact discharge - exceeds Level 4, eliminating need for external spark gaps in Class B equipment |
| Low-temperature coefficient | αT = 10.8 × 10−4/°C - enables predictable clamping across automotive and industrial ambient ranges |
| High-temperature reliability | Rated for 150 °C Tj with 1250 W surge capability - maintains protection integrity in thermally constrained layouts |
| Matt tin lead finish | Complies with J-STD-002 and JESD 22-B102 E3 - ensures robust solderability and whisker resistance in long-life deployments |
Applications
| Industrial Power Supply Input Protection | Telecom Line Interface Protection |
|---|---|
Use Scenario: 24–48 V DC input stage of programmable logic controllers exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between input rail and chassis ground to limit surge-induced overvoltage. Use Value: Clamps 26 A surges to ≤328 V, preventing damage to upstream DC-DC controllers and downstream microcontrollers. |
Use Scenario: RS-485/RS-422 data lines in outdoor base stations subjected to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary-level TVS on differential pair, coordinated with common-mode chokes and secondary filtering. Use Value: Withstands 4 kV IEC 61000-4-4 EFT bursts while maintaining <0.2 µA leakage to preserve signal integrity at 10 Mbps. |
| AC-DC Adapter Secondary-Side Protection | Motor Drive Control Board Surge Suppression |
Use Scenario: Output rectifier rail of 12 V/5 A offline adapters used in medical instrumentation requiring low EMI and high reliability. IC Role / Device Role / Timing Role: Fast-response TVS parallel to output capacitor, absorbing turn-off spikes from transformer leakage inductance. Use Value: 1500 W 10/1000 µs rating handles repetitive 100–200 V spikes without degradation over 10-year service life. |
Use Scenario: Gate drive supply rail of 3-phase IGBT inverters in HVAC compressors, subject to back-EMF and cross-conduction transients. IC Role / Device Role / Timing Role: Rail-to-ground TVS protecting isolated gate driver ICs and bootstrap capacitors from >1 kV transients. Use Value: 150 °C Tj rating allows placement near heat-generating power stages without derating loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ220A (Bourns) | Same SMC package, but 600 W PPP (10/1000 µs); higher VCL = 355 V at 17.1 A | Limited to lower-energy surges; unsuitable for 1500 W lightning test requirements | Select only if system-level testing confirms sub-600 W threat profile and layout allows tighter clamping margin |
| P6SMB220A (Littelfuse) | Identical 1500 W rating and 220 V VRWM, but higher leakage (1 µA) and no published αT spec | Acceptable for commercial-grade systems; not recommended for high-reliability industrial deployments above 85 °C | Prefer for cost-sensitive designs where extended temperature stability is not required |
Compared with SMBJ220A and P6SMB220A, SM15T220A offers superior thermal stability (10.8 × 10−4/°C αT), lower leakage (0.2 µA), and verified 1250 W surge capability at 150 °C - making it the preferred choice for mission-critical industrial and telecom infrastructure.
Availability
SM15T220A is available at Aetrix Electronics and suitable for industrial power supplies, telecom interface protection, AC-DC adapter secondary-side clamping, and motor drive control board surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SM15T220A 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 microcontroller technologies for industrial, automotive, and consumer markets.
SM15T220A belongs to ST's high-power TVS diode product line, engineered specifically for robust, high-temperature ESD and surge protection in harsh-environment power electronics and communication interfaces.
FAQ
What is the maximum clamping voltage of SM15T220A under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 328 V at 26 A for a 10/1000 µs waveform, measured at Tj = 25 °C. This value increases with junction temperature at a rate defined by αT = 10.8 × 10−4/°C, reaching ~342 V at 125 °C.
Can SM15T220A be used in bidirectional signal line protection?
No - SM15T220A is unidirectional (denoted by "A" suffix) and conducts only in reverse avalanche mode. For bidirectional protection, use SM15T220CA, which features symmetrical clamping for AC-coupled or differential lines like RS-485.
How does the dynamic resistance (RD) affect circuit protection performance?
With RD = 6.04 Ω, SM15T220A adds predictable voltage overshoot proportional to surge current (ΔV = IPP × RD). This enables accurate worst-case voltage margining for downstream ICs, especially critical for fast 8/20 µs transients where VCL rises significantly above DC breakdown.
Is SM15T220A compliant with RoHS and halogen-free requirements?
Yes - SM15T220A is manufactured in ST's ECOPACK2-compliant SMC package, meeting RoHS Directive 2011/65/EU and halogen-free standards per IEC 61249-2-21. The matte tin lead finish also complies with JESD 22-B102 E3 whisker testing.
SM15T220A 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):
- 188V
- Voltage - Breakdown (Min):
- 209V
- Voltage - Clamping (Max) @ Ipp:
- 388V
- Current - Peak Pulse (10/1000µs):
- 26A (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
SM15T220A FAQ
1.How can I place an order for SM15T220A through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T220A 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 SM15T220A reliable?
The price and inventory of SM15T220A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T220A is usually 5 days.
3.What payment methods are accepted for SM15T220A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T220A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T220A?
SM15T220A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T220A 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 SM15T220A?
For technical support, including SM15T220A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T220A requirements.
6.How does Aetrix verify that SM15T220A is sourced from the original manufacturer or authorized distributors?
All SM15T220A 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 SM15T220A meets industry standards.
7.What is the process for return or replacement of SM15T220A?
All SM15T220A units undergo pre-shipment inspection (PSI). If there is an issue with SM15T220A, 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 SM15T220A part is unused and in its original packaging.
Return procedure for SM15T220A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T220A Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
