My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SM15T33A-M3/9AT
- Part No.:
- SM15T33A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T33A-M3/9AT.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,125
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SM15T33A-M3/9AT 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), 33 V standoff voltage (VWM = 28.2 V), 45.7 V clamping voltage at 33 A peak pulse current, and 150 °C maximum junction temperature. 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 SM15T33A-M3/9AT datasheet, SM15T33A-M3/9AT pinout, SM15T33A-M3/9AT application, or SM15T33A-M3/9AT equivalent, key selection criteria include clamping voltage vs. protected device breakdown margin, peak pulse current capability under system source impedance, thermal resistance (RθJA = 75 °C/W), and halogen-free RoHS compliance per M3 suffix.
Technical Context
The SM15T33A-M3/9AT employs a glass-passivated silicon junction optimized for low-inductance transient suppression. Its unidirectional polarity features a cathode band marking and operates with reverse-biased avalanche breakdown at 31.4–34.7 V (VBR, IT = 1 mA), delivering precise clamping at 45.7 V (VC) under 33 A IPPM (10/1000 μs).
Designed for high-energy threat environments, it sustains 200 A non-repetitive forward surge current (IFSM, 10 ms half-sine) and derates linearly above 25 °C ambient per Fig. 2. Thermal performance relies on 0.31" × 0.31" copper pads (RθJL = 15 °C/W), meeting J-STD-020 MSL Level 1 (260 °C peak reflow).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 28.2 V - Maximum continuous reverse voltage before leakage exceeds 1 μA; sets operating margin below protected circuit's max reverse rating. |
| VBR (Breakdown Voltage) | 31.4–34.7 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering before downstream device failure. |
| VC (Clamping Voltage) | 45.7 V at IPPM = 33 A (10/1000 μs) - Peak voltage seen by protected IC during worst-case transient; must stay below IC's absolute max rating. |
| PPPM (Peak Pulse Power) | 1500 W - Energy-handling capacity for lightning/inductive threats; validated with standardized 10/1000 μs waveform. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on recommended pad layout; determines safe power dissipation at given ambient temperature. |
| Package | SMC (DO-214AB) - Surface-mount outline with 0.320" length, 0.246" width, and 0.126" height; compatible with automated placement and reflow. |
Pinout & Package
SMC (DO-214AB) package with two terminals: anode and cathode. Cathode identified by molded band. Leads are matte tin-plated, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker test.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; reverse-bias reference for clamping | Connected to ground or low-side return path; defines reference for VWM/VBR measurement polarity. |
| Cathode | Current exit point in forward bias; high-voltage side in reverse-bias protection | Connected to protected line (e.g., 24 V rail or sensor input); clamps transients toward anode when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) without derating on standard PCB pads. |
| Low clamping ratio (VC/VBR ≈ 1.34) | Minimizes overvoltage stress on downstream components-critical for 3.3 V/5 V logic and automotive MCUs with tight abs-max limits. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets IPC-1752A material declaration requirements and automotive OEM sustainability mandates without compromising surge performance. |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free assembly without moisture sensitivity concerns or pre-bake requirements. |
Applications
| Automotive Power Distribution | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 24 V supply rails in body control modules against load-dump and inductive kickback from solenoids and relays. IC Role / Device Role / Timing Role: Unidirectional TVS placed between rail and chassis ground to clamp transients to ≤45.7 V. Use Value: Prevents latch-up or permanent damage to CAN transceivers and microcontrollers exposed to ISO 7637-2 Pulse 1/2a/5a events. |
Use Scenario: Shielding analog input channels (e.g., 4–20 mA loops) in programmable logic controllers from field-wiring ESD and surge coupling. IC Role / Device Role / Timing Role: Primary front-end transient suppressor on signal line, upstream of precision op-amps and ADCs. Use Value: Limits transient-induced offset error and prevents saturation recovery delay by clamping within 1 ns response time. |
| Consumer Appliance Motor Control | Telecom DC Power Feeds |
Use Scenario: Safeguarding gate drivers and bootstrap circuits in BLDC motor inverters inside washing machines and HVAC systems. IC Role / Device Role / Timing Role: Rail-to-rail TVS on 12 V/15 V auxiliary supplies feeding high-side gate drivers. Use Value: Absorbs 200 A IFSM-level turn-off spikes from PFC inductors, avoiding driver IC destruction during fault conditions. |
Use Scenario: Protecting -48 V DC power inputs in base station remote radio units from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: First-stage suppression on telecom power entry, coordinated with GDT or MOV secondary stages. Use Value: Provides fast-response clamping (sub-ns) before slower bulk devices engage, reducing let-through energy to <10 mJ. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/57T | Lower PPPM (400 W), same VWM (28.2 V), higher VC (53.3 V at 7.5 A), SMA package (smaller thermal mass) | Not suitable for IEC 61000-4-5 Level 4; limited to lower-energy threats like ESD or minor switching noise | Select when board space is constrained and threat level is ≤1 kV/500 Ω; verify clamping margin with protected IC's abs-max rating. |
| SMCJ33A-M3/9AT | Higher PPPM (3000 W), identical VWM/VC specs, same SMC package, but 2× higher IPPM (66 A) and 300 A IFSM | Overqualified for most 24 V systems; requires larger PCB copper area to manage higher thermal load | Choose when protecting high-current paths (e.g., starter motor feeds) or where legacy designs mandate headroom beyond 1500 W. |
Compared with SMAJ33A-E3/57T and SMCJ33A-M3/9AT, the SM15T33A-M3/9AT delivers optimal balance of 1500 W surge handling, compact SMC footprint, and halogen-free compliance-making it the preferred choice for cost-sensitive, volume automotive and industrial 24 V systems requiring certified reliability without overengineering.
Availability
SM15T33A-M3/9AT is available at Aetrix Electronics and suitable for automotive power distribution, industrial PLC I/O protection, and consumer appliance motor control requiring stable component supply, long-term lifecycle support, and halogen-free compliance.
Supply support for SM15T33A-M3/9AT 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 engineered specifically for high-energy transient suppression in harsh environments-targeting automotive, industrial, and telecom applications where 1500 W surge immunity, AEC-Q101 readiness, and surface-mount manufacturability are mandatory.
FAQ
What is the clamping voltage of SM15T33A-M3/9AT at its rated peak pulse current?
The SM15T33A-M3/9AT has a maximum clamping voltage (VC) of 45.7 V when subjected to its specified peak pulse current (IPPM) of 33 A using the 10/1000 μs waveform. This value is measured across the device terminals under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SM15T33A-M3/9AT maintains this clamping performance consistently due to its glass-passivated junction and low-inductance SMC package.
Is SM15T33A-M3/9AT suitable for automotive applications requiring AEC-Q101 qualification?
No, the SM15T33A-M3/9AT is not AEC-Q101 qualified. It carries the M3 suffix indicating halogen-free, RoHS-compliant commercial grade construction. For automotive use, Vishay specifies AEC-Q101 variants with HE3 or HM3 suffixes (e.g., SM15T33AHM3_A/I). The SM15T33A-M3/9AT is intended for industrial and consumer applications where AEC-Q101 is not mandated, but still offers robust surge immunity and thermal performance up to 150 °C junction temperature.
What does the "M3" suffix mean in SM15T33A-M3/9AT?
The "M3" suffix in SM15T33A-M3/9AT denotes halogen-free, RoHS-compliant construction with commercial-grade reliability and JESD 201 Class 2 whisker resistance. It distinguishes the part from E3 (RoHS-compliant, non-halogen-free) and HM3/HE3 (AEC-Q101 qualified) variants. The M3 designation confirms compliance with IPC-1752A material declarations and supports sustainability requirements in industrial and consumer end equipment without altering electrical specifications of the SM15T33A-M3/9AT.
How does the thermal resistance of SM15T33A-M3/9AT affect its power dissipation capability?
The SM15T33A-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" copper pads. At 25 °C ambient, its steady-state power dissipation (PD) is rated at 6.5 W; however, this derates linearly above 25 °C per Figure 2 in the datasheet. For example, at 70 °C ambient, usable PD drops to ~3.5 W. This thermal behavior directly impacts long-term reliability in enclosed enclosures or high-power-density layouts where the SM15T33A-M3/9AT may experience elevated ambient temperatures.
Can SM15T33A-M3/9AT be used in bidirectional transient protection circuits?
No, SM15T33A-M3/9AT is strictly unidirectional. Its cathode band marking and electrical characteristics (e.g., VBR only specified in reverse direction) confirm asymmetric conduction. For bidirectional protection, Vishay specifies variants with "CA" suffix (e.g., SM15T33CA-M3/9AT), which exhibit symmetrical breakdown in both polarities. Using SM15T33A-M3/9AT in AC or floating signal lines risks failure during positive half-cycles, as it lacks reverse conduction capability-this limitation is inherent to the SM15T33A-M3/9AT design.
SM15T33A-M3/9AT 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):
- 28.2V
- Voltage - Breakdown (Min):
- 31.4V
- Voltage - Clamping (Max) @ Ipp:
- 45.7V
- Current - Peak Pulse (10/1000µs):
- 33A
- 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)
SM15T33A-M3/9AT FAQ
1.How can I place an order for SM15T33A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T33A-M3/9AT 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 SM15T33A-M3/9AT reliable?
The price and inventory of SM15T33A-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T33A-M3/9AT is usually 5 days.
3.What payment methods are accepted for SM15T33A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T33A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T33A-M3/9AT?
SM15T33A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T33A-M3/9AT 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 SM15T33A-M3/9AT?
For technical support, including SM15T33A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T33A-M3/9AT requirements.
6.How does Aetrix verify that SM15T33A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SM15T33A-M3/9AT 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 SM15T33A-M3/9AT meets industry standards.
7.What is the process for return or replacement of SM15T33A-M3/9AT?
All SM15T33A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SM15T33A-M3/9AT, 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 SM15T33A-M3/9AT part is unused and in its original packaging.
Return procedure for SM15T33A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T33A-M3/9AT 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
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
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 …
