My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SM15T22A-M3/9AT
- Part No.:
- SM15T22A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T22A-M3/9AT.pdf
- Description:
- TVS DIODE 18.8VWM 30.6VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,166
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SM15T22A-M3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection on DC power rails and signal lines. It features 22 V standoff voltage (VWM = 18.8 V), 30.6 V clamping voltage at 49 A peak pulse current (10/1000 μs), and 1500 W peak pulse power rating - deployed in automotive sensor interfaces, industrial I/O protection, and power supply input stages.
For engineers reviewing the SM15T22A-M3/9AT datasheet, SM15T22A-M3/9AT pinout, SM15T22A-M3/9AT application, or SM15T22A-M3/9AT equivalent, key selection criteria include verified clamping performance under 10/1000 μs transients, unidirectional polarity with cathode band marking, halogen-free RoHS compliance (M3 suffix), and AEC-Q101 qualification readiness via HM3 variant.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds 20.9–23.1 V breakdown (VBR at 1 mA), it avalanches to limit transient energy. Its low-inductance SMC package and glass-passivated junction enable fast response (<1 ns) and stable clamping across temperature (−65 °C to +150 °C).
Rated for 1500 W peak pulse power (10/1000 μs), it sustains 200 A non-repetitive forward surge (10 ms half-sine) and dissipates 6.5 W continuously at 50 °C ambient. Thermal resistance is 75 °C/W junction-to-ambient (on 8 mm × 8 mm copper pads), supporting robust PCB-level thermal management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 18.8 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines normal operating rail margin. |
| VBR (Breakdown Voltage) | 20.9–23.1 V at 1 mA - Confirmed avalanche initiation range; ensures reliable turn-on during overvoltage events. |
| VC (Clamping Voltage) | 30.6 V at IPPM = 49 A (10/1000 μs) - Actual voltage seen by protected circuit during worst-case surge; enables safe IC/MOSFET survival. |
| PPPM (Peak Pulse Power) | 1500 W - Energy-handling capacity for lightning-induced or inductive-switching transients per standard waveform. |
| Package | SMC (DO-214AB) - Surface-mount, low-profile package with 7.75 mm × 6.22 mm footprint; supports automated placement and meets UL 94 V-0. |
| Polarity & Marking | Unidirectional with cathode band - Band denotes cathode terminal; critical for correct orientation in DC rail protection. |
| Compliance | Halogen-free, RoHS-compliant (M3 suffix); MSL Level 1 (260 °C reflow peak); AEC-Q101 qualified variants available (HM3). |
Pinout & Package
SM15T22A-M3/9AT uses the SMC (DO-214AB) package: a two-terminal surface-mount device with cathode band marking on the body. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102. Mounting requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal for rated thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-biased anode connection point | Connected to protected line (e.g., VBUS or signal); conducts surge current to ground when voltage exceeds VBR. |
| Anode | Reference/ground return path | Typically tied to system ground or low-impedance return; completes shunt path during transient 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/2 Ω) without derating on standard PCB layouts. |
| Low clamping ratio (VC/VBR ≈ 1.33) | Minimizes overvoltage stress on downstream components - e.g., keeps 24 V rail transients below 31 V during 49 A surge. |
| Glass-passivated junction | Ensures stable VBR and low leakage (<1 μA at VWM) across temperature and lifetime; eliminates passivation-related drift. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and single-reflow processing at 260 °C peak - no baking required prior to assembly. |
| Halogen-free & RoHS-compliant (M3) | Meets IPC-1752A material declaration requirements and automotive OEM environmental mandates without compromising reliability. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load-dump and inductive switching transients in 12 V/24 V vehicle subsystems. IC Role / Device Role / Timing Role: Unidirectional shunt clamp placed between signal line and chassis ground, responding within <1 ns to limit voltage excursions. Use Value: Clamps 49 A transients to ≤30.6 V, preserving signal integrity and preventing latch-up in 3.3 V/5 V interface ICs per ISO 7637-2 Pulse 1/2/5a. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers against field-wiring induced surges from relay coils, solenoids, and motor drives. IC Role / Device Role / Timing Role: DC rail protector on 24 V supply input, absorbing repetitive 1500 W pulses without degradation. Use Value: Maintains 18.8 V stand-off while clamping to 30.6 V, ensuring uninterrupted operation of optocoupler-based isolation stages during 10/1000 μs transients. |
| Consumer Power Adapter Input | Telecom DC Power Distribution |
|
Use Scenario: Secondary-side surge suppression in AC/DC adapters and USB PD power bricks exposed to mains-borne transients and ESD coupling. IC Role / Device Role / Timing Role: Final-stage clamp on +5 V/+12 V output rails, coordinated with upstream MOVs and common-mode chokes. Use Value: Delivers 1500 W pulse handling with 30.6 V clamping - prevents overvoltage damage to USB-C controller ICs and synchronous rectifiers. |
Use Scenario: Protecting -48 V DC distribution boards in telecom base stations and remote radio units from lightning-induced surges on backplane feeds. IC Role / Device Role / Timing Role: Unidirectional TVS mounted between -48 V rail and return, leveraging low-inductance SMC layout for minimal overshoot. Use Value: Withstands 200 A 10 ms forward surge (per IEC 61000-4-5 ring wave), enabling robust front-end protection without fuse coordination issues. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A-E3/57T | Same SMC package, 22 V VWM, but lower 400 W PPPM rating and higher 35.5 V clamping at 27.5 A. | Limited to lower-energy threats (IEC 61000-4-2 ESD only); insufficient for IEC 61000-4-5 Level 3+ surges. | Select SMAJ22A-E3/57T only when cost sensitivity outweighs surge energy requirements and board space allows parallel devices. |
| SMCJ22A-M3/9AT | Same 1500 W PPPM and SMC package, but wider VBR range (20.9–25.3 V) and higher 36.5 V clamping at 41.1 A. | Higher clamping voltage reduces margin for 24 V systems; better suited for 36 V nominal rails. | Choose SMCJ22A-M3/9AT if system tolerates >36 V transient excursions and requires broader VBR tolerance for production spread control. |
Compared with SMAJ22A-E3/57T and SMCJ22A-M3/9AT, SM15T22A-M3/9AT delivers optimal balance of low clamping (30.6 V), tight VBR (20.9–23.1 V), and full 1500 W capability - making it preferred for 24 V automotive and industrial applications where voltage margin is critical.
Availability
SM15T22A-M3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom DC power distribution requiring stable component supply, halogen-free compliance, and AEC-Q101 qualification pathway.
Supply support for SM15T22A-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 designs and manufactures discrete semiconductors including diodes, MOSFETs, and TVS devices, with emphasis on reliability, power handling, and automotive-grade qualification.
The SM15T Series targets high-energy transient suppression in harsh environments - engineered specifically for 12 V/24 V/48 V DC systems where clamping precision, thermal stability, and long-term surge endurance are mandatory.
FAQ
What is the maximum clamping voltage of SM15T22A-M3/9AT under standard test conditions?
The SM15T22A-M3/9AT has a maximum clamping voltage (VC) of 30.6 V when subjected to a 10/1000 μs waveform at its peak pulse current of 49 A. This value is measured per Figure 1 in Vishay document 88380 and defines the upper voltage limit imposed on protected circuits during surge events. The SM15T22A-M3/9AT maintains this clamping performance across its specified operating temperature range.
Is SM15T22A-M3/9AT suitable for automotive applications requiring AEC-Q101 qualification?
The SM15T22A-M3/9AT itself is commercial-grade with halogen-free RoHS compliance (M3 suffix), but Vishay offers AEC-Q101 qualified versions under the HM3 suffix (e.g., SM15T22AHM3_A/I). The SM15T22A-M3/9AT shares identical electrical and thermal characteristics with its HM3 counterpart - only differing in qualification documentation and traceability - making it suitable for pre-qualification design-in and drop-in replacement once HM3 is released.
How does the SMC (DO-214AB) package of SM15T22A-M3/9AT affect PCB layout and thermal performance?
The SMC package of SM15T22A-M3/9AT requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal to achieve its rated 1500 W pulse power and 75 °C/W junction-to-ambient thermal resistance. Its low-inductance structure minimizes voltage overshoot during fast transients, and the MSL Level 1 rating permits standard reflow without baking. The SM15T22A-M3/9AT's compact 7.75 mm × 6.22 mm outline supports high-density routing in space-constrained modules.
What is the reverse leakage current specification for SM15T22A-M3/9AT at its stand-off voltage?
At its maximum stand-off voltage (VWM) of 18.8 V and TA = 25 °C, the SM15T22A-M3/9AT exhibits a maximum reverse leakage current (ID) of 1.0 μA. This low leakage ensures minimal power loss in standby mode and avoids false triggering in high-impedance sensing circuits. The SM15T22A-M3/9AT maintains this specification across its full operating temperature range per Vishay's electrical characteristics table.
Can SM15T22A-M3/9AT be used in bidirectional transient protection applications?
No - SM15T22A-M3/9AT is strictly unidirectional, indicated by its "A" suffix and cathode band marking. For bidirectional protection, Vishay specifies the "CA" suffix (e.g., SM15T22CA), which provides symmetrical clamping in both polarities. Using SM15T22A-M3/9AT in AC or bipolar signal paths would result in forward conduction during negative half-cycles, potentially damaging the device or circuit. Always verify polarity alignment before deploying SM15T22A-M3/9AT.
SM15T22A-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):
- 18.8V
- Voltage - Breakdown (Min):
- 20.9V
- Voltage - Clamping (Max) @ Ipp:
- 30.6V
- Current - Peak Pulse (10/1000µs):
- 49A
- 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)
SM15T22A-M3/9AT FAQ
1.How can I place an order for SM15T22A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T22A-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 SM15T22A-M3/9AT reliable?
The price and inventory of SM15T22A-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 SM15T22A-M3/9AT is usually 5 days.
3.What payment methods are accepted for SM15T22A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T22A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T22A-M3/9AT?
SM15T22A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T22A-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 SM15T22A-M3/9AT?
For technical support, including SM15T22A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T22A-M3/9AT requirements.
6.How does Aetrix verify that SM15T22A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SM15T22A-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 SM15T22A-M3/9AT meets industry standards.
7.What is the process for return or replacement of SM15T22A-M3/9AT?
All SM15T22A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SM15T22A-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 SM15T22A-M3/9AT part is unused and in its original packaging.
Return procedure for SM15T22A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T22A-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 …
