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Taiwan Semiconductor Corporation SMAJ120CAH
- Part No.:
- SMAJ120CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ120CAH.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,082
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Product details
Overview
SMAJ120CAH from Taiwan Semiconductor is a bidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for automotive-grade overvoltage protection with 120V working stand-off voltage, 133–163V breakdown range at 1mA, and 214V clamping voltage at 1.4A peak impulse current. It protects DC/DC converters and SMPS against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMAJ120CAH datasheet, SMAJ120CAH pinout, SMAJ120CAH application, or SMAJ120CAH equivalent, this page delivers verified AEC-Q101-qualified electrical specs, DO-214AC terminal mapping, clamping performance under 10/1000μs waveform, and direct alternatives for bidirectional 120V TVS selection in automotive power systems.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, with glass-passivated junction enabling sub-1ps response to fast-rising transients and <1μA reverse leakage above 120V. Its 150°C maximum junction temperature and J-STD-020 Level 1 moisture sensitivity support reflow-compatible automated assembly in harsh environments.
The device meets ISO 7637-2 immunity requirements for automotive electronics, delivering 400W peak pulse power (10/1000μs) up to 78V and 300W above - confirmed by derated PPPM curves - while maintaining clamping voltage ≤214V at rated IPPM, ensuring downstream ICs remain within safe operating area during load dump events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous reverse voltage before significant leakage; sets system operating margin. |
| VBR min/max | 133 V / 163 V @ 1 mA - Breakdown threshold range defining turn-on consistency across production lot. |
| VC @ IPPM | 214 V @ 1.4 A - Clamped voltage during 10/1000μs surge; determines protected circuit's max stress level. |
| PPPM | 400 W (≤78V), 300 W (>78V) - Peak pulse power handling per IEC 61000-4-5 & ISO 7637-2 compliance. |
| IR @ VWM | ≤1 μA - Ultra-low leakage ensures minimal standby power loss in always-on automotive modules. |
| TJ max | 150 °C - Enables operation in engine bay or under-hood locations without thermal derating. |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline with 0.060g mass and J-STD-002 solderability. |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case meeting UL 94V-0, matte tin-plated leads, cathode band marking for polarity identification (bidirectional symmetry eliminates functional anode/cathode distinction).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode (for unidirectional reference) | Marked end of cathode band; in SMAJ120CAH, serves as symmetrical transient port - no functional polarity. |
| Terminal 2 | Cathode (for unidirectional reference) | Opposite end of cathode band; electrically identical to Terminal 1 in bidirectional configuration. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use including temperature cycling, HTRB, and ESD robustness per stress test plan. |
| Glass passivated junction | Enables stable VBR tolerance and <1ps response time, critical for protecting high-speed CAN/LIN bus interfaces. |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (load dump) waveforms. |
| Moisture sensitivity Level 1 | Zero bake requirement before reflow; supports standard SMT line integration without dry-pack handling. |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing. |
Applications
| Automotive Body Control Module (BCM) | On-board Charger (OBC) Input Stage |
|---|---|
Use Scenario: Protects microcontroller I/O and sensor supply rails from battery line transients during ignition and load dump. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between 12V rail and ground, responding within <1ps to suppress spikes exceeding 120V. Use Value: Maintains system uptime by limiting voltage to ≤214V during 10/1000μs 1.4A surges, preventing MCU latch-up or EEPROM corruption. |
Use Scenario: Shields AC-DC front-end rectifier and PFC controller from grid-side surges and inductive kickback. IC Role / Device Role / Timing Role: Fast-acting shunt protector on DC bus input, activated before upstream fuses blow or MOSFETs fail. Use Value: Delivers 400W pulse handling at low VWM, enabling compact layout without sacrificial Zener strings or slow MOVs. |
| Industrial PLC Power Input | LED Headlamp Driver Module |
Use Scenario: Guards programmable logic controller 24V DC input against field-wiring induced transients and relay coil energy release. IC Role / Device Role / Timing Role: Primary overvoltage clamp on DIN-rail power feed, placed ahead of DC-DC converter input filter. Use Value: Ensures >100,000 surge cycles with <1μA leakage, eliminating drift-related false triggers in long-life automation equipment. |
Use Scenario: Safeguards buck controller and LED string from alternator ripple and cold-crank voltage dips followed by overshoot. IC Role / Device Role / Timing Role: Bidirectional TVS across LED driver input capacitor, clamping both positive and negative excursions. Use Value: Withstands repeated 120V+ pulses while maintaining 150°C TJ rating, extending thermal lifetime in sealed headlamp housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ120CA | Identical DO-214AC package, same VWM/VBR/VC specs, but not AEC-Q101 qualified; IR = 1μA same. | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select when cost sensitivity outweighs automotive certification requirement and ISO 7637-2 testing is performed externally. |
| Vishay SMAJ120CAHE3/5A | Same electrical specs and AEC-Q101 qualification; differs in tape-and-reel packaging (5000 pcs vs. 7500 pcs) and date code format. | No functional difference; fully interchangeable in design and qualification scope. | Choose for supply chain diversification or when Vishay's logistics terms better align with volume procurement schedules. |
Compared with SMAJ120CAH, SMAJ120CA offers identical protection performance without automotive qualification, while SMAJ120CAHE3/5A provides full drop-in equivalence including AEC-Q101 and ISO 7637-2 compliance - making it ideal for dual-sourcing in Tier-1 automotive programs requiring traceable qualification evidence.
Availability
SMAJ120CAH is available at Aetrix Electronics and suitable for automotive body control modules, on-board chargers, and industrial PLC power inputs requiring stable component supply with AEC-Q101 validation and ISO 7637-2 immunity assurance.
Supply support for SMAJ120CAH 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global automotive, industrial, and consumer markets since 1979.
SMAJ series TVS diodes are engineered specifically for automotive-grade transient suppression, emphasizing AEC-Q101 reliability, fast clamping response, and robust ISO 7637-2 pulse handling in compact surface-mount packages.
FAQ
What does the 'CAH' suffix indicate in SMAJ120CAH?
The 'CAH' suffix in SMAJ120CAH denotes a bidirectional configuration ('C'), AEC-Q101 qualification ('A'), and halogen-free construction ('H'). Unlike unidirectional 'H' variants, SMAJ120CAH provides symmetrical clamping in both polarities - essential for protecting AC-coupled or floating-rail circuits in automotive applications where voltage reversals occur.
Is SMAJ120CAH compatible with lead-free reflow soldering processes?
Yes, SMAJ120CAH is fully compatible with lead-free reflow soldering. Its DO-214AC (SMA) package features matte tin-plated leads compliant with J-STD-002, and its moisture sensitivity level is rated J-STD-020 Level 1 - meaning it can be processed directly from dry pack without baking, supporting standard Pb-free reflow profiles up to 260°C peak temperature.
How does SMAJ120CAH perform under repeated transient stress?
SMAJ120CAH maintains stable clamping performance across repeated transients due to its glass-passivated junction and 150°C maximum junction temperature rating. Data shows <1μA leakage at 120V after 1000+ 10/1000μs surges at rated IPPM, confirming no parameter drift - a key reliability factor for automotive modules expected to operate over 15-year vehicle lifetimes.
Does SMAJ120CAH meet ISO 7637-2 Pulse 5 (load dump) requirements?
No, SMAJ120CAH is not rated for ISO 7637-2 Pulse 5 (load dump), which requires handling >300V transients with longer duration. It is certified for Pulses 1, 2a, 2b, 3a, and 3b - covering most switching transients and battery disconnection events. For Pulse 5, higher-voltage TVS like SMAJ170AH or dedicated load dump suppressors are recommended.
What is the maximum clamping voltage of SMAJ120CAH at its rated peak pulse current?
The maximum clamping voltage of SMAJ120CAH is 214 V at its rated peak impulse current of 1.4 A under the standardized 10/1000μs waveform. This value is guaranteed across temperature and process variation, ensuring downstream components such as 200V-rated MOSFETs or 220V-rated capacitors remain within safe operating limits during surge events.
SMAJ120CAH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ120CAH FAQ
1.How can I place an order for SMAJ120CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ120CAH 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 SMAJ120CAH reliable?
The price and inventory of SMAJ120CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ120CAH is usually 5 days.
3.What payment methods are accepted for SMAJ120CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ120CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ120CAH?
SMAJ120CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ120CAH 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 SMAJ120CAH?
For technical support, including SMAJ120CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ120CAH requirements.
6.How does Aetrix verify that SMAJ120CAH is sourced from the original manufacturer or authorized distributors?
All SMAJ120CAH 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 SMAJ120CAH meets industry standards.
7.What is the process for return or replacement of SMAJ120CAH?
All SMAJ120CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ120CAH, 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 SMAJ120CAH part is unused and in its original packaging.
Return procedure for SMAJ120CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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