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Vishay General Semiconductor - Diodes Division SM6T22AHM3/I
- Part No.:
- SM6T22AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T22AHM3/I.pdf
- Description:
- TVS DIODE 18.8VWM 30.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,232
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Product details
Overview
SM6T22AHM3/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 22 V breakdown voltage (VBR = 20.9–23.1 V at 1 mA), 30.6 V maximum clamping voltage (VC) at 20 A peak pulse current, and 600 W peak pulse power rating with 10/1000 μs waveform - deployed on automotive sensor signal lines, MOSFET gate drivers, and industrial I/O interfaces.
For engineers reviewing the SM6T22AHM3/I datasheet, SM6T22AHM3/I pinout, SM6T22AHM3/I application, or SM6T22AHM3/I equivalent, key selection criteria include its AEC-Q101 qualification, halogen-free RoHS-compliant construction (HM3 suffix), unidirectional polarity with cathode band marking, and thermal resistance (RθJA = 100 °C/W) under standard PCB pad layout.
Technical Context
This TVS diode operates as a fast-acting shunt clamp during voltage transients, leveraging a glass-passivated silicon junction to achieve low leakage (<1 μA at 18.8 V stand-off) and low dynamic impedance. Its clamping response is specified for both 10/1000 μs and 8/20 μs waveforms, with VC = 30.6 V (10/1000 μs) and 39.3 V (8/20 μs) at rated IPPM, enabling predictable surge suppression in automotive and industrial environments.
The device is rated for continuous power dissipation of 5.0 W at 50 °C on infinite heatsink, with junction temperature range from –65 °C to +150 °C and MSL Level 1 moisture sensitivity. Its SMB package supports automated placement and meets UL 94 V-0 flammability requirements, while the HM3 suffix confirms halogen-free, RoHS-compliant, and AEC-Q101 qualified construction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 20.9 V / 23.1 V at 1 mA - defines precise voltage threshold for avalanche conduction onset |
| VWM | 18.8 V - maximum reverse operating voltage before significant leakage begins |
| VC @ IPPM | 30.6 V at 20 A (10/1000 μs) - clamping voltage limiting protected circuit stress during surge |
| PPPM | 600 W - peak transient power handling capability per standardized waveform |
| IFSM | 100 A - non-repetitive forward surge current rating (10 ms half-sine) |
| TJ max | +150 °C - maximum junction temperature enabling operation in under-hood automotive zones |
| RθJA | 100 °C/W - thermal resistance from junction to ambient, defined on 0.2" × 0.2" copper pads |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, molded plastic case with matte tin-plated leads; cathode indicated by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-impedance reference in unidirectional clamp configuration |
| Cathode | Avalanche conduction node / high-side connection | Connected to protected line; band-marked end carries transient energy into device during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables reliable suppression of ISO 7637-2 Pulse 1/2a/5a transients in 12 V automotive systems |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HAST, and mechanical shock |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and IPC-1752A material declaration requirements |
| Low clamping ratio (VC/VBR ≈ 1.32) | Minimizes overvoltage overshoot during fast transients, protecting downstream CMOS inputs |
| MSL Level 1 (260 °C peak reflow) | Supports single-pass lead-free reflow assembly without preconditioning or dry-pack requirements |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine control modules exposed to load-dump and inductive switching noise. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between sensor output and ECU input, referenced to chassis ground. Use Value: Limits transient voltage to ≤30.6 V during 20 A surges, preventing latch-up or gate oxide damage in downstream op-amps and ADC front-ends. | Use Scenario: Shielding RS-485 transceiver data lines in factory automation PLCs from ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Line-to-ground TVS on each differential pair, with cathode tied to signal line and anode to ground. Use Value: Clamps 8/20 μs surges to 39.3 V while maintaining <1 μA leakage at 18.8 V, preserving signal integrity and common-mode range. |
| MOSFET Gate Driver Protection | Consumer Power Supply Input Stage |
Use Scenario: Safeguarding high-side N-channel MOSFET gates in DC-DC converters against Miller-induced voltage spikes during switching transitions. IC Role / Device Role / Timing Role: Clamp connected between gate and source, absorbing dv/dt-induced transients before they exceed VGS(max). Use Value: Responds within nanoseconds to limit gate-source voltage to ≤30.6 V, avoiding unintended turn-on or oxide breakdown. | Use Scenario: Input-stage transient suppression in AC-DC adapters for smart home hubs, exposed to EN 61000-4-5 line surges. IC Role / Device Role / Timing Role: Primary-line TVS placed after bridge rectifier but before bulk capacitor, referenced to DC ground. Use Value: Absorbs 600 W pulses without degradation, maintaining 18.8 V stand-off to avoid conduction during normal 19 V DC bus ripple. |
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-E3/5B | Same VBR range (20.9–23.1 V), but SMA package (higher RθJA = 140 °C/W); not AEC-Q101 qualified | Limited to commercial-grade industrial or consumer use; unsuitable for under-hood automotive deployment | Select when cost sensitivity outweighs automotive qualification and thermal performance requirements |
| 1.5SMC22A | Higher PPPM (1500 W), larger SMC package; same VBR/VC specs; AEC-Q101 available only in HE3/HM3 variants | Better suited for high-energy surge environments (e.g., telecom central office), but requires larger PCB area | Choose when system-level surge testing exceeds ISO 7637-2 Level IV and board space permits SMC footprint |
Compared with SMAJ22A-E3/5B and 1.5SMC22A, SM6T22AHM3/I delivers optimal balance of AEC-Q101 compliance, SMB footprint efficiency, and validated 600 W clamping performance - making it the preferred choice for space-constrained, thermally managed automotive and industrial edge nodes.
Availability
SM6T22AHM3/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O interface hardening, and MOSFET gate driver safeguarding requiring stable component supply across production lifecycles.
Supply support for SM6T22AHM3/I 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, MOSFETs, and protection devices with emphasis on reliability, precision, and application-specific validation.
The SM6T Series was developed specifically for surface-mount transient suppression in automotive, industrial, and computing systems where AEC-Q101 qualification, low-profile packaging, and repeatable clamping performance are mandatory design requirements.
FAQ
What does the "HM3" suffix indicate in SM6T22AHM3/I?
The "HM3" suffix in SM6T22AHM3/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It confirms compliance with JESD201 Class 2 whisker resistance, MSL Level 1 reflow capability (260 °C peak), and suitability for automotive under-hood applications - distinct from commercial-grade "E3" or "M3" variants without automotive qualification.
Is SM6T22AHM3/I bidirectional or unidirectional?
SM6T22AHM3/I is a unidirectional transient voltage suppressor. Its cathode is marked by a band on the SMB package body, and it conducts only in reverse bias during overvoltage events. Bidirectional versions require the "CA" suffix (e.g., SM6T22CA), which is not present in SM6T22AHM3/I.
What is the maximum clamping voltage of SM6T22AHM3/I at 20 A?
The maximum clamping voltage (VC) of SM6T22AHM3/I is 30.6 V when subjected to a 10/1000 μs waveform at 20 A peak pulse current. This value is guaranteed per Vishay's datasheet (Document Number 88385, Rev. 09-Jan-2024) and defines the upper voltage limit imposed on protected circuitry during standardized surge events.
Can SM6T22AHM3/I be used in place of SM6T22A-E3/52?
SM6T22AHM3/I is not a direct drop-in replacement for SM6T22A-E3/52 due to differences in qualification and material content: SM6T22AHM3/I is AEC-Q101 qualified and halogen-free, whereas SM6T22A-E3/52 is commercial-grade and RoHS-compliant but not automotive-qualified. Electrical parameters match, but automotive designs require HM3's validated reliability.
What PCB pad layout is recommended for optimal thermal performance of SM6T22AHM3/I?
Vishay specifies that SM6T22AHM3/I achieves its rated RθJA = 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. The recommended mounting pad layout is documented in the package outline drawing (page 4 of Doc. 88385), with minimum pad dimensions of 0.086" × 0.060" (2.18 mm × 1.52 mm) and thermal relief design advised for solderability.
SM6T22AHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6T, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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):
- 20A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SM6T22AHM3/I FAQ
1.How can I place an order for SM6T22AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T22AHM3/I 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 SM6T22AHM3/I reliable?
The price and inventory of SM6T22AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T22AHM3/I is usually 5 days.
3.What payment methods are accepted for SM6T22AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T22AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T22AHM3/I?
SM6T22AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T22AHM3/I 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 SM6T22AHM3/I?
For technical support, including SM6T22AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T22AHM3/I requirements.
6.How does Aetrix verify that SM6T22AHM3/I is sourced from the original manufacturer or authorized distributors?
All SM6T22AHM3/I 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 SM6T22AHM3/I meets industry standards.
7.What is the process for return or replacement of SM6T22AHM3/I?
All SM6T22AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T22AHM3/I, 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 SM6T22AHM3/I part is unused and in its original packaging.
Return procedure for SM6T22AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T22AHM3/I Tags
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