My Inquiry
My Account
STMicroelectronics SM15T33CAY
- Part No.:
- SM15T33CAY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T33CAY.pdf
- Description:
- TVS DIODE 28.2VWM 59VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:5,671
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SM15T33CAY from STMicroelectronics is a bidirectional automotive-grade transient voltage suppression (TVS) diode in SMC package, designed for ISO 7637-2 pulse protection (Pulse 1: −150 V; Pulse 2a: +112 V; Pulse 3a: −220 V; Pulse 3b: +150 V) and ESD robustness per ISO 10605 (±30 kV air/contact discharge). It features 33 V breakdown voltage (VBR = 33 V min), 45.7 V clamping voltage (VCL) at 169 A (8/20 µs), and 1500 W peak pulse power (10/1000 µs) at Tj = 25 °C.
For engineers reviewing the SM15T33CAY datasheet, SM15T33CAY pinout, SM15T33CAY application, or SM15T33CAY equivalent, this device serves as a high-reliability surge protector in 12 V automotive power networks-especially for engine control units, body control modules, and infotainment power inputs where low leakage (0.2 µA @ 25 °C), high Tj max (150 °C), and AEC-Q101 qualification are mandatory.
Technical Context
The SM15T33CAY employs planar junction technology to achieve stable VBR temperature coefficient (αT = 9.8 × 10−4/°C) and low dynamic resistance (RD = 0.14 Ω at 8/20 µs), enabling precise clamping under fast transients. Its bidirectional symmetry ensures identical surge response for positive and negative polarity events.
It meets IEC 61000-4-4 Level 4 (4 kV), exceeds ISO 10605 Level 4 (±30 kV), and supports full ISO 7637-2 compliance-including Pulse 1 (inductive load dump), Pulse 2a (supply disconnection), and Pulse 3a/b (switching noise)-without derating below Tj = 125 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min) | 33 V - Ensures reliable turn-on above nominal 12 V system voltage with margin against ripple and tolerance drift |
| VCL @ 169 A (8/20 µs) | 45.7 V - Clamps transients to safe levels for downstream 48 V-tolerant ICs (e.g., CAN transceivers, MCU I/O) |
| IPP (8/20 µs) | 169 A - Supports worst-case ISO 7637-2 Pulse 3b (150 V, 50 Ω source) without failure |
| RD | 0.14 Ω - Minimizes voltage overshoot during high-di/dt events; critical for fast-edge pulse suppression |
| IR @ VRM = 28.2 V | 0.2 µA @ 25 °C - Prevents battery drain in always-on automotive circuits (e.g., alarm systems, telematics) |
| Tj max | 150 °C - Enables operation in under-hood environments (e.g., near engine ECU housings) without thermal shutdown |
| Package | SMC (DO-214AB) - Industry-standard footprint (7.75 × 5.55 mm) with IPC-7531-compliant land pattern |
Pinout & Package
SM15T33CAY uses the SMC (DO-214AB) surface-mount package: 7.75 mm × 5.55 mm × 2.45 mm body, matte tin-plated leads, MSL Level 1, and JEDEC-registered outline. Lead spacing (E) is 8.15 mm; cathode band is marked on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Low-side terminal for bidirectional conduction | Connects to ground or low-impedance return path; forms symmetrical clamp with Cathode |
| Cathode (K) | High-side terminal for bidirectional conduction | Connects to protected line (e.g., battery rail); enables equal clamping in both polarities |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use across −40 °C to +125 °C ambient, including temperature cycling and HTRB stress |
| ISO 7637-2 Pulse 1–3b compliance | Withstands −150 V (Pulse 1), +112 V (Pulse 2a), −220 V (Pulse 3a), and +150 V (Pulse 3b) without degradation |
| ESD immunity (ISO 10605) | ±30 kV contact/air discharge - eliminates need for secondary ESD protection on board-level interfaces |
| Low Tj-dependent leakage | 1 µA @ 85 °C - maintains <1 µA total standby current in multi-device BOMs for low-power modules |
| Planar junction construction | Enables stable VBR drift (<±5%) over 15-year lifetime at Tj = 125 °C, supporting ASIL-B functional safety goals |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) LIN Bus Line |
|---|---|
|
Use Scenario: Protects 12 V supply rail of gasoline/diesel engine ECUs against load dump (ISO 7637-2 Pulse 1) and alternator switching spikes. IC Role / Device Role / Timing Role: Bidirectional TVS placed between battery feed and input filter capacitor; clamps within 1 ns to limit voltage seen by DC-DC converters and microcontrollers. Use Value: Prevents latch-up or permanent damage to 5 V/3.3 V regulators and CAN FD transceivers during cranking and ignition events. |
Use Scenario: Shields LIN bus physical layer (e.g., MC33662) from ESD and coupled transients from adjacent high-current loads (e.g., window motors). IC Role / Device Role / Timing Role: Bidirectional clamp connected between LIN line and chassis ground; operates symmetrically to suppress ±30 kV ESD and ±150 V ISO 7637-2 pulses. Use Value: Maintains LIN communication integrity during door slam ESD events and prevents false wake-up or bus lockup in sleep mode. |
| Infotainment Head Unit Power Supply | Advanced Driver Assistance Systems (ADAS) Camera Power |
|
Use Scenario: Guards 12 V input of head unit mainboard against battery reversal, jump-start surges, and ISO 7637-2 Pulse 3b (150 V) during module hot-swap. IC Role / Device Role / Timing Role: First-line protection before input fuse and bulk capacitor; absorbs >1500 W energy in 10/1000 µs waveform without thermal runaway. Use Value: Eliminates need for redundant TVS stages, reducing BOM count while meeting OEM EMC validation requirements (e.g., GMW3172, Ford EMC-CS-2009). |
Use Scenario: Safeguards 12 V camera power input in rear-view or surround-view systems exposed to ESD during service and conducted noise from nearby radar modules. IC Role / Device Role / Timing Role: Bidirectional TVS mounted directly at connector entry point; clamps transients before they propagate into image sensor power domain. Use Value: Prevents pixel corruption, frame drop, or sensor reset caused by sub-100 ns ESD bursts-critical for ASIL-A video processing pipelines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional automotive TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33CA | Lower PPP (400 W), higher VCL (53.3 V @ 75 A), SMA package (smaller thermal mass) | Not suitable for ISO 7637-2 Pulse 1 (−150 V) due to insufficient peak power rating | Select only for non-automotive 12 V systems with lower surge severity (e.g., industrial sensors) |
| SMBJ33CA | Higher PPP (600 W), same VBR, SMB package (intermediate thermal performance) | Meets ISO 10605 but fails ISO 7637-2 Pulse 1/3a due to 600 W limit vs required 1500 W | Acceptable for LIN/CAN node protection where full load dump immunity is not mandated |
Compared with SMAJ33CA and SMBJ33CA, SM15T33CAY delivers 2.5× and 2.5× higher peak pulse power respectively-enabling single-device compliance with full ISO 7637-2 and ISO 10605 requirements in space-constrained SMC footprint, eliminating cascaded protection schemes.
Availability
SM15T33CAY is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, infotainment head units, and ADAS camera power supplies requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SM15T33CAY 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 discrete solutions with over 40 years of analog protection IP development.
The SM15Txx series targets automotive power rail protection, engineered specifically to meet AEC-Q101, ISO 7637-2, and ISO 10605 requirements in harsh under-hood and cabin environments.
FAQ
What is the maximum clamping voltage of SM15T33CAY under ISO 7637-2 Pulse 3b conditions?
The SM15T33CAY clamps to 45.7 V at 169 A (8/20 µs), which corresponds to ISO 7637-2 Pulse 3b (150 V, 50 Ω source). This value is measured per IEC 61000-4-5 test setup and confirmed in DS6928 Rev 6 Table 2, ensuring downstream 48 V-rated components remain within safe operating area.
Can SM15T33CAY replace unidirectional TVS diodes in battery-positive line protection?
No-SM15T33CAY is bidirectional and must be used in differential or ground-referenced configurations. For battery-positive line protection (e.g., against load dump), a unidirectional part like SM15T33AY is required to avoid forward conduction during normal operation. Using SM15T33CAY here would cause short-circuit behavior.
How does the 0.14 Ω dynamic resistance impact circuit protection performance?
The 0.14 Ω RD limits voltage overshoot during fast-rising transients (e.g., ESD), reducing VCL by up to 2.4 V compared to devices with RD > 0.3 Ω at 100 A. This directly improves margin for 3.3 V/5 V logic rails and reduces stress on downstream ceramic capacitors.
Is SM15T33CAY compatible with lead-free reflow profiles per J-STD-020?
Yes-SM15T33CAY is rated MSL Level 1 and qualified for peak reflow temperatures up to 245 °C (see DS6928 Figure 25). Its matte tin plating meets JESD 22-B102 E3 and MIL-STD-750 Method 2026, ensuring solder joint reliability without pre-baking.
SM15T33CAY 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):
- 28.2V
- Voltage - Breakdown (Min):
- 31.4V
- Voltage - Clamping (Max) @ Ipp:
- 59V
- Current - Peak Pulse (10/1000µs):
- 169A (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
SM15T33CAY FAQ
1.How can I place an order for SM15T33CAY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T33CAY 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 SM15T33CAY reliable?
The price and inventory of SM15T33CAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T33CAY is usually 5 days.
3.What payment methods are accepted for SM15T33CAY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T33CAY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T33CAY?
SM15T33CAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T33CAY 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 SM15T33CAY?
For technical support, including SM15T33CAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T33CAY requirements.
6.How does Aetrix verify that SM15T33CAY is sourced from the original manufacturer or authorized distributors?
All SM15T33CAY 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 SM15T33CAY meets industry standards.
7.What is the process for return or replacement of SM15T33CAY?
All SM15T33CAY units undergo pre-shipment inspection (PSI). If there is an issue with SM15T33CAY, 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 SM15T33CAY part is unused and in its original packaging.
Return procedure for SM15T33CAY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T33CAY 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…
