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Vishay General Semiconductor - Diodes Division SMAJ120CAHM3/H
- Part No.:
- SMAJ120CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ120CAHM3/H.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,451
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Product details
Overview
SMAJ120CAHM3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 120 V stand-off 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), targeting automotive and industrial power line and signal line protection.
For engineers reviewing the SMAJ120CAHM3/H datasheet, SMAJ120CAHM3/H pinout, SMAJ120CAHM3/H application, or SMAJ120CAHM3/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, MSL Level 1 moisture sensitivity, halogen-free RoHS compliance, and thermal resistance (RθJA = 120 °C/W) under standard PCB pad layout.
Technical Context
This device operates as a voltage-clamped shunt protector: during transients exceeding VWM (120 V), it avalanches to limit voltage across protected circuitry to ≤193 V. Its bidirectional symmetry ensures identical clamping in both polarities-critical for AC-coupled or floating signal lines.
Constructed with glass-passivated junction and matte tin-plated leads, SMAJ120CAHM3/H supports automated SMT placement and withstands reflow up to 260 °C (MSL Level 1). It delivers 400 W surge handling at TA = 25 °C, derating to 300 W above 78 V per specification, with junction temperature range from –55 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 120 V - Maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 133–147 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering without premature conduction. |
| VC (Clamping Voltage) | 193 V at IPPM = 1.6 A - Peak voltage seen by protected circuit during 10/1000 μs transient; determines stress on downstream components. |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - Energy-handling capacity under standardized surge; validates suitability for IEC 61000-4-5 Level 3/4 threats. |
| ID (Reverse Leakage) | 1.0 μA max at VWM - Minimal standby current; preserves low-power system integrity and avoids false triggers. |
| TJ max. | +150 °C - Enables operation in under-hood automotive or high-ambient industrial environments without thermal shutdown. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 5.0 mm × 5.0 mm copper pad footprint; compatible with JEDEC MS-013. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; no polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive half-cycle) | Conducts surge current into device during positive overvoltage events; symmetric with cathode in bidirectional mode. |
| Cathode | Transient current entry (negative half-cycle) | Conducts surge current into device during negative overvoltage events; functionally identical to anode due to CA symmetry. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing-enables use in engine control, ADAS, and infotainment systems. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets global environmental regulations and eliminates corrosive halogen emissions during soldering or end-of-life processing. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow profiles without baking or special handling-reduces manufacturing overhead. |
| 400 W peak pulse power (10/1000 μs) | Provides proven immunity against common industrial switching surges and ISO 7637-2 pulse 1/2a/3a events. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns response), improving protection fidelity for high-speed interfaces. |
Applications
| Automotive Power Line Protection | Industrial Sensor Signal Lines |
|---|---|
Use Scenario: Protecting LIN bus or 12 V supply rails in body control modules from load dump and alternator ripple. IC Role / Device Role / Timing Role: Shunt TVS diode placed between power rail and ground, clamping transients before they reach MCU or CAN transceivers. Use Value: Withstands 400 W surges and operates up to +150 °C, meeting AEC-Q101 requirements for under-hood deployment. |
Use Scenario: Safeguarding analog outputs (e.g., 4–20 mA current loops) and digital sensor interfaces (I²C, SPI) in factory automation PLCs. IC Role / Device Role / Timing Role: Bidirectional clamp on differential or single-ended signal pairs, suppressing ESD and inductive kickback without DC bias disruption. Use Value: 120 V VWM and 193 V VC ensure compatibility with 24 V industrial systems while preserving signal integrity during ±8 kV contact ESD events. |
| Telecom Interface Protection | Consumer Appliance Motor Control |
Use Scenario: Shielding Ethernet PHY or RS-485 transceivers in networked home gateways from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary-level TVS placed at connector entry point, working in coordination with GDTs or polymer PTCs in multi-stage protection schemes. Use Value: Bidirectional symmetry and 193 V clamping enable effective suppression of both common-mode and differential-mode transients on twisted-pair lines. |
Use Scenario: Guarding microcontroller GPIOs and gate drivers in smart washing machine motor inverters against back-EMF from BLDC commutation. IC Role / Device Role / Timing Role: Localized TVS on low-voltage control signals adjacent to high-side/low-side MOSFET drivers. Use Value: Fast response time and low Rsurge prevent latch-up or permanent damage to 3.3 V logic despite repeated 100 V+ inductive spikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ120AHE3/H | Unidirectional variant; same VWM/VBR/VC ratings but asymmetric conduction (cathode-banded); not suitable for AC or floating nodes. | Restricted to DC-biased rails where polarity is fixed (e.g., 12 V battery input); cannot replace SMAJ120CAHM3/H in bidirectional signal paths. | Select only when circuit topology guarantees unidirectional voltage polarity and AEC-Q101 + halogen-free requirements remain aligned. |
| SMBJ120CA-M3/5A | Same electrical specs but SMB (DO-214AA) package: 3.5 mm × 3.5 mm footprint vs. SMA's 4.5 mm × 3.99 mm; higher RθJA (150 °C/W). | Lower power density handling; requires larger copper area or forced cooling for sustained 400 W surges; less robust in high-temperature enclosures. | Acceptable for space-constrained consumer designs with moderate ambient temperatures; avoid in automotive under-hood or industrial high-TA environments. |
Compared with SMAJ120AHE3/H and SMBJ120CA-M3/5A, SMAJ120CAHM3/H uniquely combines bidirectional clamping, AEC-Q101 qualification, halogen-free construction, and optimized thermal performance in the SMA package-making it the preferred choice for automotive signal integrity and industrial fieldbus protection where polarity independence and reliability are mandatory.
Availability
SMAJ120CAHM3/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, telecom infrastructure, and consumer appliance designs requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ120CAHM3/H 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, efficiency, and application-specific optimization.
The SMAJ series was engineered for high-energy transient suppression in harsh environments-targeting automotive, industrial, and telecom systems where failure resilience and AEC-Q101 compliance are non-negotiable.
FAQ
What does the 'CA' suffix indicate in SMAJ120CAHM3/H?
The 'CA' suffix in SMAJ120CAHM3/H denotes a bidirectional configuration: the device provides symmetrical clamping for both positive and negative voltage transients, with identical breakdown and clamping characteristics in either polarity. This makes SMAJ120CAHM3/H ideal for protecting AC-coupled lines, differential buses, or floating circuits where voltage polarity is undefined or reversible-unlike unidirectional variants such as SMAJ120AHE3/H.
Is SMAJ120CAHM3/H qualified for automotive applications?
Yes, SMAJ120CAHM3/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code structure (HM3 suffix denotes halogen-free, RoHS-compliant, and AEC-Q101 qualified versions). It undergoes rigorous stress testing-including temperature cycling, highly accelerated life testing (HALT), and ESD validation-to meet automotive reliability standards for under-hood and cabin electronics, including body control modules and ADAS sensor interfaces.
What is the maximum clamping voltage for SMAJ120CAHM3/H under surge conditions?
The maximum clamping voltage (VC) for SMAJ120CAHM3/H is 193 V, measured at a peak pulse current (IPPM) of 1.6 A using the standardized 10/1000 μs waveform. This value represents the highest voltage that will appear across the protected circuit during a worst-case transient event, directly determining the stress imposed on downstream ICs and ensuring safe operation within their absolute maximum ratings.
How does the HM3 suffix differ from E3 or M3 in SMAJ120CAHM3/H?
The HM3 suffix in SMAJ120CAHM3/H indicates halogen-free, RoHS-compliant construction with full AEC-Q101 qualification-distinguishing it from E3 (RoHS-compliant commercial grade), M3 (halogen-free RoHS-compliant commercial grade), and HE3 (RoHS-compliant AEC-Q101 qualified). HM3 ensures compliance with both environmental mandates and automotive reliability requirements, making SMAJ120CAHM3/H suitable for safety-critical vehicle subsystems.
Can SMAJ120CAHM3/H be used in place of SMAJ120AHE3/H?
No-SMAJ120CAHM3/H is bidirectional while SMAJ120AHE3/H is unidirectional; substituting them without circuit review risks failure. SMAJ120AHE3/H conducts only in reverse bias (cathode-banded), whereas SMAJ120CAHM3/H clamps equally in both directions. Use SMAJ120CAHM3/H only where bidirectional protection is required, such as on AC signal lines or floating grounds; for fixed-polarity DC rails, SMAJ120AHE3/H remains appropriate.
SMAJ120CAHM3/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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/H FAQ
1.How can I place an order for SMAJ120CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ120CAHM3/H 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/H reliable?
The price and inventory of SMAJ120CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ120CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ120CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ120CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ120CAHM3/H?
SMAJ120CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ120CAHM3/H 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/H?
For technical support, including SMAJ120CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ120CAHM3/H requirements.
6.How does Aetrix verify that SMAJ120CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ120CAHM3/H 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/H meets industry standards.
7.What is the process for return or replacement of SMAJ120CAHM3/H?
All SMAJ120CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ120CAHM3/H, 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/H part is unused and in its original packaging.
Return procedure for SMAJ120CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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