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Vishay General Semiconductor - Diodes Division SMAJ120CAHM3_A/I
- Part No.:
- SMAJ120CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ120CAHM3_A/I.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,201
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Product details
Overview
SMAJ120CAHM3_A/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 120 V standoff voltage (VWM), 133–147 V breakdown voltage (VBR) at 1 mA, 193 V maximum clamping voltage (VC) at 1.6 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform), suitable for protecting automotive sensor interfaces and industrial I/O circuits against ESD and load-switching surges.
For engineers reviewing the SMAJ120CAHM3_A/I datasheet, SMAJ120CAHM3_A/I pinout, SMAJ120CAHM3_A/I application, or SMAJ120CAHM3_A/I equivalent, this device delivers verified bidirectional surge suppression with AEC-Q101 qualification, halogen-free RoHS compliance, and MSL Level 1 moisture sensitivity - critical for automotive-grade board-level protection design and long-term supply continuity in harsh-environment electronics.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or differential signal paths without polarity concerns. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at VWM), while the low incremental surge resistance supports rapid energy dissipation during transient events.
The device is rated for 150 °C maximum junction temperature and exhibits a typical thermal resistance of 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads. Its 10/1000 μs waveform rating applies up to 400 W below 78 V and 300 W above - confirmed for SMAJ120CAHM3_A/I per Vishay Document 88390, Revision 09-Jan-2024.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 120 V - Maximum continuous reverse voltage before clamping begins; defines safe operating margin for 12 V–48 V systems with headroom. |
| VBR (Breakdown Voltage) | 133–147 V at 1 mA - Confirmed minimum/maximum threshold where avalanche conduction initiates reliably under transient stress. |
| VC (Clamping Voltage) | 193 V at IPPM = 1.6 A - Measured peak voltage across device during 10/1000 μs surge; determines protected circuit's maximum overvoltage exposure. |
| PPPM (Peak Pulse Power) | 400 W (≤78 V), 300 W (>78 V) - Validated energy-handling capability per standardized waveform; enables robust protection against ISO 7637-2 Pulse 1/2a/2b/5a. |
| ID (Reverse Leakage) | ≤1.0 μA at 120 V - Ensures negligible standby current draw in always-on automotive modules and battery-powered sensors. |
| TJ max. | 150 °C - Supports operation in under-hood automotive environments and industrial enclosures without derating below ambient 105 °C. |
| Package | SMA (DO-214AC) - Surface-mount footprint compatible with automated assembly; 0.208" × 0.157" body size with matte tin-plated leads. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with glass passivated chip junction; terminals are matte tin plated, solderable per J-STD-002 and JESD 22-B102; no polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional transient path | Both terminals function identically - no cathode band marking; enables placement without orientation check in PCB layout. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment power rails per stress test requirements. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets EU Directive 2011/65/EU and JEDEC J-STD-203; supports green manufacturing and end-of-life recycling mandates. |
| MSL Level 1 (260 °C peak reflow) | Enables single-pass lead-free reflow without moisture-induced popcorn failure; eliminates baking requirement pre-assembly. |
| 400 W peak pulse power (10/1000 μs) | Provides higher surge margin than legacy 200 W TVS devices, reducing need for parallel devices in high-energy transient zones. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Indicates efficient voltage limiting - protects downstream MOSFETs and ICs with tight absolute maximum ratings (e.g., 200 V-rated gate drivers). |
Applications
| Automotive Sensor Interface Protection | Industrial PLC Digital Input Protection |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor front-ends (e.g., pressure, temperature) from load-dump and inductive switching transients in 12 V/24 V vehicle subsystems. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between signal line and ground, responding within <1 ps to limit overvoltage before IC damage occurs. Use Value: Prevents latch-up or gate oxide rupture in automotive-grade microcontrollers and analog front-end ICs exposed to ISO 16750-2 pulses up to 100 V. |
Use Scenario: Safeguarding 24 V DC digital input channels on programmable logic controllers against field-wiring induced surges and relay contact bounce. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected across input terminal and common rail, absorbing repetitive 400 W transients without degradation. Use Value: Extends mean time between failures (MTBF) of PLC input modules by eliminating false triggering and component wear from repeated 1 kV/500 A surge events. |
| Telecom Line Surge Protection | Consumer Appliance Motor Drive Protection |
|
Use Scenario: Shielding RS-485/RS-232 data lines in base station equipment and network routers from lightning-induced surges and EFT bursts. IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF at 0 V) bidirectional suppressor placed at connector entry point to shunt energy before transceiver IC. Use Value: Maintains signal integrity up to 10 Mbps while meeting IEC 61000-4-5 Level 3 (2 kV line-earth) and IEC 61000-4-4 (2 kV EFT) immunity standards. |
Use Scenario: Clamping back-EMF spikes generated by brushed DC motors in washing machines, HVAC blowers, and power tools. IC Role / Device Role / Timing Role: Parallel-connected TVS across motor terminals to clamp inductive kickback exceeding 300 V during commutation. Use Value: Eliminates need for snubber RC networks, reduces BOM count, and prevents MOSFET drain-source avalanche failure in H-bridge driver stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ120CAHE3_A/I | Same electrical specs, but RoHS-compliant commercial grade (non-halogen-free); lacks halogen-free certification. | Approved for non-automotive industrial and consumer use where halogen-free material is not mandated. | Select when cost sensitivity outweighs halogen-free requirement and AEC-Q101 is not needed. |
| SMBJ120CAHM3_A/I | Same VWM/VBR/VC ratings, but SMB (DO-214AA) package - 25 % larger footprint and 10 % higher RθJA (133 °C/W). | Better suited for lower-density boards or higher-power derating scenarios requiring enhanced thermal margin. | Choose when PCB layout allows larger pad area and thermal performance must exceed SMAJ120CAHM3_A/I's 120 °C/W RθJA. |
Compared with SMAJ120CAHE3_A/I, the HM3 variant adds halogen-free compliance and AEC-Q101 qualification without electrical trade-offs; versus SMBJ120CAHM3_A/I, it offers identical protection in a smaller footprint but requires tighter thermal management on high-power boards.
Availability
SMAJ120CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC inputs, telecom line interface hardening, and appliance motor drive circuits requiring stable component supply across multi-year production cycles.
Supply support for SMAJ120CAHM3_A/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, automotive qualification, and high-volume manufacturability.
The SMAJ series is engineered specifically for board-level transient suppression in automotive, industrial, and telecom applications - delivering consistent clamping performance, AEC-Q101 validation, and surface-mount compatibility for automated production.
FAQ
What is the clamping voltage of SMAJ120CAHM3_A/I at its rated peak pulse current?
The SMAJ120CAHM3_A/I has a maximum clamping voltage (VC) of 193 V at a peak pulse current (IPPM) of 1.6 A, measured under the standardized 10/1000 μs waveform. This value is confirmed in Vishay Document 88390, Table on page 2, and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ120CAHM3_A/I maintains this clamping performance across its full operating temperature range of –55 °C to +150 °C.
Is SMAJ120CAHM3_A/I suitable for automotive applications?
Yes, SMAJ120CAHM3_A/I is AEC-Q101 qualified and explicitly designated for automotive use via its HM3 suffix (halogen-free, RoHS-compliant, and AEC-Q101 qualified). It meets stress test requirements for temperature cycling, humidity bias, and mechanical shock relevant to engine bay, chassis, and cabin modules. The SMAJ120CAHM3_A/I is commonly deployed in ADAS camera power rails, body control module I/O protection, and infotainment system USB/USB-C port surge suppression.
How does the bidirectional configuration of SMAJ120CAHM3_A/I affect PCB layout?
The SMAJ120CAHM3_A/I has no polarity marking - both terminals are functionally identical - allowing unrestricted orientation during automated placement. This eliminates orientation verification steps in SMT programming and avoids misplacement-related rework. Layout requires only two symmetric pads matching the SMA (DO-214AC) outline (0.208" × 0.157"), with recommended 0.2" × 0.2" copper areas per terminal to sustain its 400 W pulse rating per Vishay's thermal guidelines.
What is the maximum reverse leakage current for SMAJ120CAHM3_A/I at its standoff voltage?
The SMAJ120CAHM3_A/I exhibits a maximum reverse leakage current (ID) of 1.0 μA at its 120 V standoff voltage (VWM), tested at 25 °C. This ultra-low leakage ensures minimal power loss in always-on automotive modules (e.g., telematics wake-up circuits) and preserves battery life in portable industrial sensors. Leakage remains ≤5.0 μA up to +85 °C, as validated in Vishay's thermal derating curves.
Does SMAJ120CAHM3_A/I require special handling during reflow soldering?
No - SMAJ120CAHM3_A/I is rated MSL Level 1 per J-STD-020, with a maximum peak reflow temperature of 260 °C for lead-free processes. It can be processed in standard convection or vapor-phase reflow ovens without pre-baking or dry-pack requirements. The device's matte tin-plated leads ensure reliable wetting and joint formation per J-STD-002B, and its glass passivated junction withstands thermal shock from multiple reflow cycles without parameter shift.
SMAJ120CAHM3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 120V
- Voltage - Breakdown (Min):
- 133V
- Voltage - Clamping (Max) @ Ipp:
- 193V
- Current - Peak Pulse (10/1000µs):
- 1.6A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ120CAHM3_A/I FAQ
1.How can I place an order for SMAJ120CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ120CAHM3_A/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 SMAJ120CAHM3_A/I reliable?
The price and inventory of SMAJ120CAHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ120CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ120CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ120CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ120CAHM3_A/I?
SMAJ120CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ120CAHM3_A/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 SMAJ120CAHM3_A/I?
For technical support, including SMAJ120CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ120CAHM3_A/I requirements.
6.How does Aetrix verify that SMAJ120CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ120CAHM3_A/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 SMAJ120CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ120CAHM3_A/I?
All SMAJ120CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ120CAHM3_A/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 SMAJ120CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ120CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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