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Vishay General Semiconductor - Diodes Division SM15T15A-M3/57T
- Part No.:
- SM15T15A-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T15A-M3/57T.pdf
- Description:
- TVS DIODE 12.8VWM 21.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SM15T15A-M3/57T from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, rated for 1500 W peak pulse power (10/1000 μs), 21.2 V clamping voltage at 71.0 A peak pulse current, and 12.8 V stand-off voltage. It protects MOSFETs, ICs, and sensor signal lines against lightning-induced and inductive-switching transients in automotive and industrial power electronics.
For engineers reviewing the SM15T15A-M3/57T datasheet, SM15T15A-M3/57T pinout, SM15T15A-M3/57T application, or SM15T15A-M3/57T equivalent, key selection criteria include unidirectional polarity, 150 °C max junction temperature, halogen-free RoHS compliance, and AEC-Q101 qualification readiness via HM3 suffix variants.
Technical Context
This TVS diode operates as a clamping device with a defined breakdown voltage range of 14.3–15.8 V at 1.0 mA test current and exhibits low dynamic impedance to limit transient overvoltage across protected circuits. Its glass-passivated junction ensures stable leakage performance (<1.0 μA at 12.8 V) and robust surge handling under high source-impedance conditions.
The device is optimized for high-energy transient suppression using a 10/1000 μs waveform, with thermal resistance of 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead), enabling reliable operation on standard 8.0 mm × 8.0 mm copper pads without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 μs) | 1500 W - sustains single high-energy surges common in automotive load-dump and industrial motor switching |
| Stand-off Voltage (VWM) | 12.8 V - maximum continuous reverse voltage before significant leakage; sets operating margin below system rail |
| Breakdown Voltage (VBR) | 14.3–15.8 V at 1.0 mA - defines onset of avalanche conduction; tight tolerance enables precise protection threshold |
| Clamping Voltage (VC) | 21.2 V at 71.0 A - limits voltage seen by downstream ICs during worst-case transient; critical for 24 V system compatibility |
| Peak Pulse Current (IPPM) | 71.0 A (10/1000 μs) - quantifies surge-handling capacity; validated with 0.31" × 0.31" copper pad layout |
| Junction Temperature Range | −65 to +150 °C - supports under-hood automotive and industrial environments without derating up to 125 °C ambient |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height |
Pinout & Package
SM15T15A-M3/57T uses the SMC (DO-214AB) package: molded epoxy case meeting UL 94 V-0, matte tin-plated leads solderable per J-STD-002, and cathode band marking for unidirectional polarity identification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to system ground or low-side reference | Completes clamping path during reverse transient; must be routed with low-inductance trace to minimize overshoot |
| Cathode | Current exit terminal in forward bias; marked with band; connected to protected line | Defines polarity-sensitive placement; connects to I/O, power rail, or signal line requiring overvoltage clamping |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Enables protection against IEC 61000-4-5 Level 4 surges (4 kV line-earth) in 24 V systems without cascaded stages |
| Glass-passivated junction | Ensures <1.0 μA leakage at 12.8 V and stable VBR over 1000-hour HTOL testing, critical for battery-powered sensors |
| Low inductance design | Minimizes voltage overshoot during fast-rising transients (e.g., <100 ns edges), preserving clamping effectiveness |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets IPC-1752A material declaration requirements and automotive OEM environmental mandates (e.g., GMW3172) |
| MSL Level 1 (260 °C peak reflow) | Supports single-pass lead-free reflow assembly without moisture sensitivity concerns or baking preconditioning |
Applications
| Automotive Power Distribution | Industrial Motor Drive I/O Protection |
|---|---|
Use Scenario: Protecting 24 V supply rails in body control modules against load-dump transients (ISO 16750-2) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC input, clamping spikes above 15 V. Use Value: Prevents latch-up or permanent damage to buck controllers and microcontrollers during 120 V/100 ms load-dump events. |
Use Scenario: Safeguarding encoder feedback lines and digital I/O ports in servo drives exposed to inductive kickback from 3-phase motors. IC Role / Device Role / Timing Role: Point-of-use TVS on differential RS-422/485 lines and discrete GPIO, suppressing 1 kV/100 Ω transients. Use Value: Maintains signal integrity and prevents false triggering of safety logic during 500 A coil de-energization. |
| Telecom Power Interface | Consumer Appliance Control Board |
Use Scenario: Shielding PoE-powered Ethernet switch ports from lightning-induced surges coupled onto data lines. IC Role / Device Role / Timing Role: Secondary-level TVS on isolated DC-DC output side, coordinated with primary GDT and common-mode chokes. Use Value: Limits clamped voltage to <22 V, ensuring compliance with IEEE 802.3af/bt immunity requirements. |
Use Scenario: Guarding microcontroller reset and UART lines in washing machine main boards against ESD and relay contact bounce. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS on 3.3 V logic rails, placed adjacent to connector entry points. Use Value: Absorbs 8 kV HBM ESD pulses without disrupting firmware execution or causing brownout resets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ15A-E3/57T | Lower peak pulse power (400 W), same VWM/VC, SMA package (smaller thermal mass) | Limited to lower-energy threats (IEC 61000-4-2 ESD only); not suitable for ISO 7637-2 pulse 5a | Select when board space is constrained and surge threat level is ≤400 W; verify thermal derating at 85 °C ambient |
| SMCJ15A-M3/57T | Higher peak pulse power (1500 W), identical VWM/VC, same SMC package but higher IPPM (100 A) | Better suited for 48 V systems or higher-current fault paths; requires larger PCB copper area for thermal management | Choose for enhanced margin in harsh environments (e.g., off-highway vehicles) where 71 A may approach design limit |
Compared with SMAJ15A-E3/57T and SMCJ15A-M3/57T, SM15T15A-M3/57T delivers optimal balance of 1500 W surge capability, compact SMC footprint, and halogen-free compliance-making it ideal for cost-sensitive 24 V automotive and industrial designs where AEC-Q101 qualification is pending but not yet required.
Availability
SM15T15A-M3/57T is available at Aetrix Electronics and suitable for automotive power distribution, industrial motor drive I/O protection, telecom power interface, and consumer appliance control board applications requiring stable component supply and halogen-free compliance.
Supply support for SM15T15A-M3/57T 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, and protection devices with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SM15T Series was developed for high-energy transient suppression in 12 V–220 V systems, targeting automotive, industrial, and telecom applications where robustness against lightning and inductive switching surges is mandatory.
FAQ
What is the clamping voltage of SM15T15A-M3/57T at its rated peak pulse current?
The SM15T15A-M3/57T has a maximum clamping voltage (VC) of 21.2 V when subjected to its rated peak pulse current of 71.0 A using the standard 10/1000 μs waveform. This value is measured under specified test conditions with 0.31" × 0.31" copper pads and confirms the device's ability to limit transient overvoltage to safe levels for downstream 24 V-rated ICs. The SM15T15A-M3/57T maintains this clamping performance across its full operating temperature range.
Is SM15T15A-M3/57T suitable for automotive applications requiring AEC-Q101 qualification?
The SM15T15A-M3/57T itself is not AEC-Q101 qualified; however, Vishay offers functionally identical variants with HM3 suffix (e.g., SM15T15AHM3_A/H) that meet AEC-Q101 stress testing requirements. The SM15T15A-M3/57T shares the same die, package, and electrical characteristics but is designated for commercial-grade use. For production automotive designs, engineers should specify the HM3 variant while using SM15T15A-M3/57T for prototyping or non-safety-critical subsystems.
What does the "M3" suffix indicate in SM15T15A-M3/57T?
The "M3" suffix in SM15T15A-M3/57T denotes halogen-free, RoHS-compliant construction with matte tin-plated leads meeting JESD 201 Class 2 whisker resistance. It also signifies compliance with Vishay's material categorization standard (doc# 99912) and MSL Level 1 rating for lead-free reflow. Unlike "E3" (RoHS-compliant commercial) or "HM3" (AEC-Q101 + halogen-free), the M3 suffix confirms environmental compliance without automotive qualification. The SM15T15A-M3/57T is fully compatible with standard SMT assembly processes.
How does SM15T15A-M3/57T differ from bidirectional TVS diodes like SM15T15CA-M3/57T?
The SM15T15A-M3/57T is unidirectional and features a cathode band marking, intended for DC rail protection where polarity is fixed. In contrast, SM15T15CA-M3/57T is bidirectional with no polarity marking and symmetric clamping in both directions-used for AC lines or data signals with undefined voltage polarity. Both share identical VWM, VBR, and PPPM ratings, but the SM15T15A-M3/57T offers lower leakage (<1.0 μA) in reverse bias compared to bidirectional variants at equivalent VWM. Selection depends strictly on circuit topology, not performance tier.
What PCB layout guidance applies to SM15T15A-M3/57T for optimal transient suppression?
For optimal performance, SM15T15A-M3/57T must be mounted on minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal to achieve rated 71.0 A peak pulse current and 1500 W power dissipation. Traces to the protected node should be short and wide to minimize inductance; avoid vias in the clamping path. Thermal relief should be minimized on cathode/anode pads to ensure low RθJA. The SM15T15A-M3/57T datasheet specifies these dimensions as mandatory-not optional-for compliance with published electrical ratings.
SM15T15A-M3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- SM15T, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 12.8V
- Voltage - Breakdown (Min):
- 14.3V
- Voltage - Clamping (Max) @ Ipp:
- 21.2V
- Current - Peak Pulse (10/1000µs):
- 71A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SM15T15A-M3/57T FAQ
1.How can I place an order for SM15T15A-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T15A-M3/57T 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 SM15T15A-M3/57T reliable?
The price and inventory of SM15T15A-M3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T15A-M3/57T is usually 5 days.
3.What payment methods are accepted for SM15T15A-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T15A-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T15A-M3/57T?
SM15T15A-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T15A-M3/57T 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 SM15T15A-M3/57T?
For technical support, including SM15T15A-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T15A-M3/57T requirements.
6.How does Aetrix verify that SM15T15A-M3/57T is sourced from the original manufacturer or authorized distributors?
All SM15T15A-M3/57T 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 SM15T15A-M3/57T meets industry standards.
7.What is the process for return or replacement of SM15T15A-M3/57T?
All SM15T15A-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SM15T15A-M3/57T, 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 SM15T15A-M3/57T part is unused and in its original packaging.
Return procedure for SM15T15A-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T15A-M3/57T Tags
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