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Vishay General Semiconductor - Diodes Division SMCJ12CAHE3/57T
- Part No.:
- SMCJ12CAHE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ12CAHE3/57T.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,580
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Product details
Overview
SMCJ12CAHE3/57T from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 12 V standoff voltage (VWM), 19.9 V clamping voltage at 75.4 A peak pulse current, and 1500 W peak pulse power dissipation with 10/1000 µs waveform - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMCJ12CAHE3/57T datasheet, SMCJ12CAHE3/57T pinout, SMCJ12CAHE3/57T application, or SMCJ12CAHE3/57T equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 1500 W surge rating, low clamping ratio (VC/VWM = 1.66), and RoHS-compliant matte tin terminations suitable for automated SMT assembly.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ leakage at 12 V), but triggers into low-impedance conduction when transients exceed its breakdown range (13.3–14.7 V at 1 mA). Its glass-passivated junction ensures stable avalanche behavior and fast response (<1 ns), while the SMC package provides thermal robustness via 15 °C/W junction-to-lead resistance.
The SMCJ12CAHE3/57T is explicitly rated for bidirectional operation - electrical characteristics apply identically in both polarities - and meets MSL level 1 per J-STD-020 with 260 °C lead-free reflow compatibility. Its AEC-Q101 qualification confirms suitability for automotive powertrain and body electronics where reliability under thermal cycling and surge stress is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 13.3 V / 14.7 V at 1 mA - guaranteed avalanche initiation window for predictable turn-on |
| VC @ IPPM | 19.9 V at 75.4 A - clamping voltage limits downstream IC stress during 10/1000 µs surge |
| PPPM | 1500 W - peak pulse power handling capacity defines transient energy absorption limit |
| ID @ VWM | 5 µA max - ultra-low leakage preserves signal integrity and battery life in always-on circuits |
| TJ max | +150 °C - extended junction temperature rating supports under-hood automotive deployment |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 8.0 mm × 8.0 mm copper pad thermal design |
Pinout & Package
SMCJ12CAHE3/57T uses the SMC (DO-214AB) package: a low-profile, rectangular surface-mount case with two coplanar matte tin-plated leads. No polarity marking is present on bidirectional variants; terminals are symmetric and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during positive transients | Acts as cathode during negative transients - bidirectional symmetry enables single-device protection across AC or floating DC lines |
| Cathode | Current entry point during negative transients | Acts as anode during positive transients - eliminates need for dual-diode configurations in differential or ungrounded systems |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and surge endurance per JESD22-A101/A110 |
| 1500 W peak pulse power | Withstands IEC 61000-4-5 Level 4 (4 kV line-earth, 2 kV line-line) surges without degradation |
| Low clamping ratio (VC/VWM = 1.66) | Minimizes voltage overshoot during clamping - critical for protecting 12 V logic and CAN transceivers |
| MSL Level 1, 260 °C peak | Compatible with standard lead-free reflow profiles without preconditioning or baking |
| Glass-passivated junction | Ensures stable breakdown voltage over lifetime and immunity to moisture-induced parameter drift |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
Use Scenario: Protection of 12 V supply rails in engine control units against load dump and alternator ripple. IC Role / Device Role / Timing Role: Shunt TVS device clamping transients before they reach MCU power pins or voltage regulators. Use Value: Prevents latch-up and permanent damage to 3.3 V/5 V logic domains during ISO 7637-2 Pulse 5a (75 V/350 ms) events. | Use Scenario: Shielding analog outputs (e.g., 4–20 mA current loops) from ESD and inductive switching noise in factory automation. IC Role / Device Role / Timing Role: Bidirectional clamping element placed across signal and return paths near connector interface. Use Value: Maintains signal fidelity below ±15 V common-mode swing while surviving contact discharge up to ±8 kV (IEC 61000-4-2). |
| Telecom Line Interface | Consumer USB Power Delivery |
Use Scenario: Surge suppression on Ethernet PHY power and data pairs exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-level TVS placed upstream of PoE injectors and magnetics. Use Value: Absorbs 1500 W transient energy without failure, preserving IEEE 802.3af/at compliance and link uptime. | Use Scenario: Overvoltage guard on VBUS lines in USB-C PD adapters and portable chargers. IC Role / Device Role / Timing Role: Secondary-stage protector after primary fuse and upstream MOV, handling fast-rising transients from hot-plug events. Use Value: Clamps to 19.9 V within nanoseconds, preventing damage to buck converters and PD controllers rated for ≤20 V absolute max. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC12CA | Same VWM (12 V) and VC (19.9 V), but lower PPPM (1000 W); SOD-123FL package | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a or IEC 61000-4-5 Level 4 | Select only for space-constrained consumer applications with defined <1 kV surge exposure. |
| SMCJ12CAHM3/57T | Identical electrical specs and AEC-Q101 qualification; halogen-free version with HM3 suffix | No functional difference; required only where halogen-free compliance is mandated by OEM or regional regulation | Choose HM3 variant when RoHS + halogen-free certification (e.g., JESD201 Class 2) is contractually required. |
Compared with SAC12CA and SMCJ12CAHM3/57T, the SMCJ12CAHE3/57T delivers full 1500 W surge capacity in a thermally optimized SMC package while meeting baseline RoHS requirements - making it the default choice for automotive and industrial designs requiring proven energy-handling margin and reflow compatibility.
Availability
SMCJ12CAHE3/57T is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom line protection requiring stable component supply and long-term lifecycle assurance.
Supply support for SMCJ12CAHE3/57T 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 and application-specific performance.
The SMCJ series targets high-energy transient suppression in harsh environments - engineered for automotive, industrial, and telecom infrastructure where sustained surge immunity and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of SMCJ12CAHE3/57T at its rated peak pulse current?
The SMCJ12CAHE3/57T has a maximum clamping voltage (VC) of 19.9 V at its rated peak pulse current (IPPM) of 75.4 A, measured using the standardized 10/1000 µs double-exponential waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCJ12CAHE3/57T maintains this clamping performance consistently due to its glass-passivated junction and low incremental surge resistance.
Is SMCJ12CAHE3/57T suitable for automotive applications?
Yes, the SMCJ12CAHE3/57T is AEC-Q101 qualified and explicitly designed for automotive use - validated for temperature cycling, mechanical shock, humidity bias, and surge endurance per automotive reliability standards. Its 1500 W peak pulse power rating supports protection against load dump (ISO 7637-2 Pulse 5a) and alternator transients. The SMCJ12CAHE3/57T also meets MSL Level 1 and is compatible with lead-free reflow, making it appropriate for engine control modules, body control units, and ADAS sensor interfaces.
How does the bidirectional configuration of SMCJ12CAHE3/57T affect its circuit implementation?
The bidirectional configuration of SMCJ12CAHE3/57T means it provides symmetrical clamping in both polarities - no cathode marking is present, and either terminal may serve as anode or cathode depending on transient polarity. This eliminates the need for back-to-back unidirectional TVS diodes in AC-coupled or floating systems such as RS-485 buses, Ethernet pairs, or differential sensor outputs. The SMCJ12CAHE3/57T simplifies layout and reduces BOM count while maintaining identical VBR, VC, and PPPM in both directions.
What is the thermal resistance profile of SMCJ12CAHE3/57T, and how does it impact PCB layout?
The SMCJ12CAHE3/57T has a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W and junction-to-ambient (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. To sustain repeated surge events, PCB layout must provide minimum recommended pad area (0.31″ × 0.31″) and avoid thermal isolation. The SMCJ12CAHE3/57T relies on copper mass for heat dissipation during transient conduction - undersized pads increase junction temperature and risk parametric shift or failure during high-duty-cycle surges.
Does SMCJ12CAHE3/57T require derating at elevated ambient temperatures?
Yes, the SMCJ12CAHE3/57T requires derating above TA = 25 °C, as shown in Figure 2 of its datasheet (Document Number 88394). Peak pulse power and current ratings decrease linearly with increasing ambient temperature - for example, at 85 °C ambient, PPPM is reduced to approximately 70 % of its 25 °C value. Designers must apply this derating when sizing protection for under-hood or enclosed industrial environments. The SMCJ12CAHE3/57T's +150 °C maximum junction temperature allows operation in high-temperature zones when properly heatsinked.
SMCJ12CAHE3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 75.4A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMCJ)
SMCJ12CAHE3/57T FAQ
1.How can I place an order for SMCJ12CAHE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ12CAHE3/57T 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 SMCJ12CAHE3/57T reliable?
The price and inventory of SMCJ12CAHE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ12CAHE3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ12CAHE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ12CAHE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ12CAHE3/57T?
SMCJ12CAHE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ12CAHE3/57T 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 SMCJ12CAHE3/57T?
For technical support, including SMCJ12CAHE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ12CAHE3/57T requirements.
6.How does Aetrix verify that SMCJ12CAHE3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ12CAHE3/57T 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 SMCJ12CAHE3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ12CAHE3/57T?
All SMCJ12CAHE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ12CAHE3/57T, 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 SMCJ12CAHE3/57T part is unused and in its original packaging.
Return procedure for SMCJ12CAHE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ12CAHE3/57T Tags
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