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STMicroelectronics SM15T56CAY
- Part No.:
- SM15T56CAY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T56CAY.pdf
- Description:
- TVS DIODE 48VWM 100VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:1,739
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Product details
Overview
SM15T56CAY from STMicroelectronics is a bidirectional automotive-grade transient voltage suppressor (TVS) diode in SMC package, designed for ISO 7637-2 pulse protection in 12 V/24 V vehicle systems. It features a 56 V nominal breakdown voltage (VBR = 53.3–58.9 V), 77.4 V clamping voltage (VCL) at 20 A (10/1000 µs), 1500 W peak pulse power, and ≤0.2 µA leakage at 25 °C - deployed in engine control units, body electronics, and infotainment power rails.
For engineers reviewing the SM15T56CAY datasheet, SM15T56CAY pinout, SM15T56CAY application, or SM15T56CAY equivalent, key selection criteria include bidirectional surge handling per ISO 10605 (±30 kV ESD), ISO 7637-2 Pulse 1/2a/3a/3b compliance, junction temperature operation up to +150 °C, low dynamic resistance (0.411 Ω), and SMC footprint compatibility with IPC7531.
Technical Context
This TVS operates as a voltage-clamped shunt protector: during transients exceeding its standoff voltage (VRWM = 48 V), it avalanches to clamp induced surges within defined VCL limits. Its planar silicon structure ensures stable VBR temperature coefficient (αT = 10.3 × 10−4/°C) and low leakage across −55 °C to +150 °C junction range.
It delivers bidirectional protection without polarity sensitivity - symmetric clamping for both positive and negative transients - validated for 8/20 µs (10 kW) and 10/1000 µs (1500 W) waveforms, with dynamic resistance (RD) of 0.411 Ω enabling precise VCL prediction via VCL(max) = VBR(max) + RD × IPP.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 48 V - maximum continuous reverse working voltage before avalanche onset; defines safe operating margin below battery system peaks. |
| VBR (min/typ/max) | 53.3 / 56 / 58.9 V at 1 mA - tight 56 V nominal breakdown ensures predictable turn-on timing across temperature and production lot. |
| VCL @ 20 A (10/1000 µs) | 77.4 V - clamping voltage under standard automotive surge test; limits downstream IC stress during load dump or inductive kick. |
| PPP (10/1000 µs) | 1500 W - peak pulse power rating at Tj = 25 °C; derates to 1250 W at Tj = 150 °C per Figure 3. |
| IPP (8/20 µs) | 100 A - peak pulse current capability for high-energy fast transients like ESD contact discharge. |
| RD | 0.411 Ω - dynamic resistance determining VCL rise slope; enables accurate clamping prediction for custom surge profiles. |
| IR @ VRWM | 0.2 µA at 25 °C - ultra-low leakage preserves battery standby current in always-on automotive modules. |
Pinout & Package
SM15T56CAY uses the SMC (DO-214AB) surface-mount package: 7.75–8.15 mm length, 5.55–6.25 mm width, 2.45 mm max height, matte tin-plated leads compliant with J-STD-002 and JEDEC MO-136AC. Thermal resistance Rth(j-a) is 100 °C/W on standard FR4 PCB with 3.14 cm² copper area per lead.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Cathode marked) | Transient current sink (bidirectional) | Both terminals conduct equally during ± surges; no polarity dependency - simplifies layout in differential or floating lines. |
| Cathode (band-marked end) | Transient current sink (bidirectional) | Marking band identifies cathode terminal but does not imply unidirectional behavior; device functions identically in either orientation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood environments including thermal cycling, humidity, and mechanical shock per JESD22 standards. |
| ISO 7637-2 Pulse 1/2a/3a/3b compliance | Withstands −150 V (Pulse 1), +112 V (Pulse 2a), −220 V (Pulse 3a), and +150 V (Pulse 3b) on 12 V systems without degradation. |
| IEC 61000-4-2 & ISO 10605 ESD robustness | Passes ±30 kV air/contact discharge (C = 150 pF/R = 330 Ω and C = 330 pF/R = 330 Ω), exceeding Level 4 requirements. |
| Low dynamic resistance (0.411 Ω) | Enables precise clamping voltage modeling for system-level surge analysis and reduces voltage overshoot during fast transients. |
| Junction temperature range: −55 to +150 °C | Supports placement near heat sources (e.g., power converters, motor drivers) without derating loss or reliability risk. |
Applications
| Engine Control Unit (ECU) Power Input | Automotive Infotainment Display Interface |
|---|---|
|
Use Scenario: Protection of 12 V supply rail against load dump (ISO 7637-2 Pulse 5a) and alternator-induced spikes. IC Role / Device Role / Timing Role: Shunt clamping TVS placed upstream of DC/DC converter input to limit transient overvoltage before regulation. Use Value: Clamps 77.4 V at 20 A, preventing >80 V stress on downstream buck controller ICs rated for 60 V absolute max. |
Use Scenario: ESD protection on LVDS or FPD-Link III video data lines connecting head unit to display. IC Role / Device Role / Timing Role: Bidirectional clamping element on differential signal pairs to suppress ±30 kV contact discharge without signal distortion. Use Value: Low 0.411 Ω RD minimizes VCL rise time, preserving signal integrity up to 3 Gbps while meeting CISPR 25 Class 5 EMC. |
| Body Control Module (BCM) LIN Bus Line | ADAS Camera Power Supply |
|
Use Scenario: Surge suppression on LIN bus physical layer exposed to battery transients and ground bounce. IC Role / Device Role / Timing Role: Low-leakage (0.2 µA) bidirectional TVS across LIN line and ground to maintain <1 µA bus quiescent current. Use Value: Enables reliable LIN communication during ISO 7637-2 Pulse 3b (+150 V) events without false wake-up or bus lockup. |
Use Scenario: Input protection for 5 V camera module power rail subjected to hot-swap and cable discharge events. IC Role / Device Role / Timing Role: Primary clamping device between fuse output and camera PMIC input, sized for 100 A 8/20 µs surge. Use Value: 100 A IPP rating handles worst-case cable discharge per ISO 10605, preventing PMIC latch-up or internal LDO failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ58CA | 58 V VRWM, 93.6 V VCL @ 13.3 A, 400 W PPP, SMA package | Lower power rating and higher clamping voltage; suitable only for non-critical 12 V circuits with margin >15 V. | Select when cost sensitivity outweighs automotive qualification and high-energy surge immunity. |
| TPSMD58CA | 58 V VRWM, 93.6 V VCL @ 13.3 A, 1500 W PPP, SMC package, AEC-Q101 | Identical electrical specs but different manufacturer; slightly higher leakage (1 µA vs. 0.2 µA at 25 °C). | Choose for dual-sourcing where identical clamping performance and package are required but tighter leakage is noncritical. |
Compared with SMAJ58CA and TPSMD58CA, SM15T56CAY offers lower VRWM (48 V vs. 58 V) for earlier turn-on during rising transients, tighter VCL (77.4 V vs. ≥93.6 V), and superior leakage performance - critical for always-on automotive nodes with strict quiescent current budgets.
Availability
SM15T56CAY is available at Aetrix Electronics and suitable for engine control units, ADAS camera modules, infotainment displays, and body control modules requiring stable component supply across automotive production lifecycles.
Supply support for SM15T56CAY 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, designing and manufacturing microcontrollers, power devices, sensors, and analog ICs for automotive, industrial, and consumer markets.
The SM15Txx series belongs to ST's automotive-qualified TVS portfolio, engineered specifically to meet stringent ISO 7637-2 and ISO 10605 requirements for 12 V/24 V vehicle electrical systems.
FAQ
Is SM15T56CAY unidirectional or bidirectional?
SM15T56CAY is a bidirectional TVS diode, indicated by the "CA" suffix in its part number. It provides symmetrical clamping for both positive- and negative-polarity transients without polarity-dependent installation - verified by identical VBR, VCL, and IPP values in both directions per Table 2 and Figure 8.
What is the maximum operating junction temperature?
The maximum operating junction temperature (Tj(max)) for SM15T56CAY is +150 °C, validated per AEC-Q101 stress testing. At this temperature, peak pulse power derates to 1250 W (10/1000 µs), and leakage remains ≤1 µA - confirmed in Figure 9 and Table 1.
Does SM15T56CAY comply with ISO 7637-2 Pulse 5a (load dump)?
No - SM15T56CAY is not rated for ISO 7637-2 Pulse 5a (load dump), which requires sustained energy handling beyond its 1500 W 10/1000 µs rating. It is certified for Pulses 1 (−150 V), 2a (+112 V), 3a (−220 V), and 3b (+150 V) only, as stated in the "Complies with the following standards" section and Figure 13–16.
What is the recommended PCB footprint for SM15T56CAY?
The recommended footprint follows IPC7531 and ST's Figure 18: 8.19 mm pad length, 5.11 mm pad width, 3.14 mm center-to-center spacing, with 1.54 mm solder mask opening per pad. Copper area ≥3.14 cm² per lead reduces Rth(j-a) to 100 °C/W, per Figure 12.
SM15T56CAY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- SM15TY, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 100V
- Current - Peak Pulse (10/1000µs):
- 100A (8/20µs)
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
SM15T56CAY FAQ
1.How can I place an order for SM15T56CAY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T56CAY 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 SM15T56CAY reliable?
The price and inventory of SM15T56CAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T56CAY is usually 5 days.
3.What payment methods are accepted for SM15T56CAY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T56CAY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T56CAY?
SM15T56CAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T56CAY 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 SM15T56CAY?
For technical support, including SM15T56CAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T56CAY requirements.
6.How does Aetrix verify that SM15T56CAY is sourced from the original manufacturer or authorized distributors?
All SM15T56CAY 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 SM15T56CAY meets industry standards.
7.What is the process for return or replacement of SM15T56CAY?
All SM15T56CAY units undergo pre-shipment inspection (PSI). If there is an issue with SM15T56CAY, 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 SM15T56CAY part is unused and in its original packaging.
Return procedure for SM15T56CAY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T56CAY Tags
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