My Inquiry
My Account
STMicroelectronics SM15T15CAY
- Part No.:
- SM15T15CAY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T15CAY.pdf
- Description:
- TVS DIODE 12.8VWM 27.2VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:6,074
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SM15T15CAY from STMicroelectronics is a bidirectional automotive-grade transient voltage suppression (TVS) diode in SMC package, designed for ISO 7637-2 pulse protection and ISO 10605 ESD immunity in 12 V vehicle systems. It features a 15 V nominal breakdown voltage (VBR = 12.8–15.8 V), 21.2 A peak pulse current (IPP) at 10/1000 µs, 27.2 A at 8/20 µs, clamping voltage of 33.2 V (max), and leakage current ≤0.2 µA at 25 °C - deployed in engine control units and body electronics to suppress load dump and ESD transients.
For engineers reviewing the SM15T15CAY datasheet, SM15T15CAY pinout, SM15T15CAY application, or SM15T15CAY equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, ISO 7637-2 pulse compliance (Pulse 1, 2a, 3a, 3b), thermal derating curves, and bidirectional TVS design guidance for automotive power line protection.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling robust protection of differential signal lines or ungrounded power rails without polarity dependency. Its planar junction structure ensures low leakage (<1 µA up to 85 °C) and stable VBR drift (αT = 8.4 × 10−4/°C), critical for long-term reliability in high-temperature under-hood environments.
Clamping performance is defined by dynamic resistance RD = 0.031 Ω (typ.) and VCL = 33.2 V (max) at IPP = 21.2 A (10/1000 µs), delivering predictable voltage limiting during fast transients such as ISO 10605 contact discharge (±30 kV) and ISO 7637-2 Pulse 3b (+150 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 12.8 / 14.3 / 15.8 V - defines precise conduction onset threshold for bidirectional surge clamping |
| VCL @ IPP | 33.2 V max at 21.2 A (10/1000 µs) - maximum voltage seen by protected circuit during worst-case surge |
| IPP (10/1000 µs) | 21.2 A - peak current capability matching ISO 7637-2 Pulse 1 (−150 V) and Pulse 3a (−220 V) energy levels |
| RD (dynamic) | 0.031 Ω - low impedance limits voltage overshoot during fast-rising transients like ESD |
| IR @ VRM | 0.2 µA max at 25 °C - ultra-low leakage preserves signal integrity in high-impedance sensor interfaces |
| Tj max | +150 °C - enables operation in engine bay locations without thermal derating below rated power |
| PPP (10/1000 µs) | 1500 W - peak power handling validated per IEC 61000-4-5 waveform definition |
Pinout & Package
The SM15T15CAY uses an SMC (DO-214AB) surface-mount package with two terminals: Cathode (K) and Anode (A), arranged symmetrically for bidirectional operation. The device has no polarity marking; both terminals are functionally identical in reverse-biased conduction mode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode (A) / Cathode (K) | Identical bidirectional terminal - conducts in either direction when reverse voltage exceeds VBR |
| Terminal 2 | Cathode (K) / Anode (A) | Identical bidirectional terminal - forms symmetrical clamping path with Terminal 1 |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use including temperature cycling, humidity bias, and mechanical shock per JESD22 standards |
| ISO 7637-2 compliance | Withstands Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), and Pulse 3b (+150 V) on 12 V systems |
| ISO 10605 ESD immunity | Passes ±30 kV air/contact discharge (C = 150 pF/R = 330 Ω and C = 330 pF/R = 330 Ω) |
| Low Tj-dependent leakage | ≤1 µA up to +85 °C - maintains high-impedance interface stability in cabin and powertrain modules |
| Matte tin lead finish | Complies with J-STD-002, JESD22-B102 E3, and JEDEC solderability requirements for automated assembly |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) LIN Bus |
|---|---|
|
Use Scenario: Protection of 12 V supply rail against load dump (ISO 7637-2 Pulse 1) and alternator switching transients. IC Role / Device Role / Timing Role: Bidirectional clamping element placed upstream of DC-DC converters and microcontrollers. Use Value: Limits voltage to ≤33.2 V during −150 V transients, preventing latch-up or overvoltage damage to downstream ASICs. |
Use Scenario: ESD protection on LIN bus physical layer (TP12/TP13) in door modules and seat controllers. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS shunting fast ESD pulses before transceiver input pins. Use Value: Clamps ±30 kV discharges to <33.2 V within nanoseconds, preserving LIN signal integrity and transceiver functionality. |
| Infotainment Head Unit USB Interface | ADAS Camera Power Line |
|
Use Scenario: Surge suppression on VBUS line of USB 2.0 ports exposed to hot-plug and cable-induced transients. IC Role / Device Role / Timing Role: Secondary protection stage after common-mode choke, absorbing residual differential surges. Use Value: Delivers 21.2 A peak current handling at 10/1000 µs, meeting USB-IF surge test requirements for automotive infotainment. |
Use Scenario: Protection of 12 V camera power input against ignition noise and battery disconnect spikes in surround-view systems. IC Role / Device Role / Timing Role: Primary TVS on camera module PCB, mounted adjacent to connector to minimize inductance. Use Value: Maintains <0.2 µA leakage at 25 °C, avoiding false triggers in low-power wake-on-event camera circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ15CA | Same VBR range (12.8–15.8 V), but lower PPP = 600 W and higher VCL = 24.4 V @ 24.4 A | Not AEC-Q101 qualified; limited to non-automotive industrial use | Select only if cost sensitivity outweighs automotive qualification and 1500 W surge margin |
| 1.5KE15CA | Higher VCL = 24.4 V @ 61.5 A (10/1000 µs), axial lead package, no SMC footprint compatibility | Lacks ISO 10605 ESD rating and reflow profile validation for SMT production | Use only in legacy through-hole designs where board space and automated assembly are not constraints |
Compared with SMBJ15CA and 1.5KE15CA, SM15T15CAY provides AEC-Q101 qualification, 2.5× higher peak power (1500 W vs. 600 W), lower dynamic resistance (0.031 Ω vs. ≥0.05 Ω), and SMC package compatibility with automotive PCB layouts - making it the sole choice for new ECU, BCM, and ADAS designs requiring full ISO 7637-2 and ISO 10605 compliance.
Availability
SM15T15CAY is available at Aetrix Electronics and suitable for engine control units, body control modules, infotainment head units, and ADAS camera systems requiring stable component supply with full automotive qualification and traceable sourcing.
Supply support for SM15T15CAY 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 automotive, industrial, and power management ICs with vertical manufacturing and rigorous quality certification.
The SM15Txx series belongs to ST's automotive TVS portfolio, engineered specifically for ISO 7637-2 and ISO 10605 compliance in 12 V and 24 V vehicle networks - emphasizing low leakage, high Tj operation, and planar junction reliability.
FAQ
What is the difference between SM15T15AY and SM15T15CAY?
SM15T15AY is unidirectional (anode-cathode polarity), intended for single-polarity DC lines like battery inputs; SM15T15CAY is bidirectional (symmetrical), used on floating or AC-coupled lines such as LIN, CAN, or USB VBUS. Their VBR, VCL, and IPP values are identical, but conduction behavior differs fundamentally.
Does SM15T15CAY meet ISO 7637-2 Pulse 3b requirements?
Yes - SM15T15CAY is explicitly rated for ISO 7637-2 Pulse 3b (+150 V) per DS6928 Rev 6, Figure 16. Its 33.2 V clamping voltage ensures protected circuits remain below 40 V during this fast-rising transient, satisfying automotive OEM requirements for camera and radar power inputs.
Can SM15T15CAY be used in 24 V systems?
No - SM15T15CAY's 15 V VBR and 33.2 V VCL are optimized for 12 V nominal systems. For 24 V applications, ST recommends SM15T27CAY (VBR = 23.1–28.4 V) or SM15T33CAY (VBR = 28.2–34.7 V), which provide appropriate standoff and clamping margins above battery float voltage.
What is the thermal resistance (Rth(j-a)) of SM15T15CAY on standard FR4?
Per DS6928 Figure 12, Rth(j-a) = 100 °C/W for SM15T15CAY mounted on the recommended IPC7531 footprint (3.14 cm² copper area per lead). With 5 cm² total copper, Rth(j-a) improves to ~65 °C/W - enabling full 1500 W surge capability at Tj = 150 °C without exceeding junction limits.
SM15T15CAY 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):
- 12.8V
- Voltage - Breakdown (Min):
- 14.3V
- Voltage - Clamping (Max) @ Ipp:
- 27.2V
- Current - Peak Pulse (10/1000µs):
- 368A (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
SM15T15CAY FAQ
1.How can I place an order for SM15T15CAY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T15CAY 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 SM15T15CAY reliable?
The price and inventory of SM15T15CAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T15CAY is usually 5 days.
3.What payment methods are accepted for SM15T15CAY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T15CAY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T15CAY?
SM15T15CAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T15CAY 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 SM15T15CAY?
For technical support, including SM15T15CAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T15CAY requirements.
6.How does Aetrix verify that SM15T15CAY is sourced from the original manufacturer or authorized distributors?
All SM15T15CAY 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 SM15T15CAY meets industry standards.
7.What is the process for return or replacement of SM15T15CAY?
All SM15T15CAY units undergo pre-shipment inspection (PSI). If there is an issue with SM15T15CAY, 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 SM15T15CAY part is unused and in its original packaging.
Return procedure for SM15T15CAY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T15CAY 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…
