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Vishay General Semiconductor - Diodes Division SMCJ30CAHE3/57T
- Part No.:
- SMCJ30CAHE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ30CAHE3/57T.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,487
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Product details
Overview
SMCJ30CAHE3/57T from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients on power and signal lines. It features a 30 V standoff voltage (VWM), 48.4 V maximum clamping voltage at 31.0 A peak pulse current (10/1000 µs), and 1500 W peak pulse power rating. Used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMCJ30CAHE3/57T datasheet, SMCJ30CAHE3/57T pinout, SMCJ30CAHE3/57T application, or SMCJ30CAHE3/57T equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 1500 W surge handling, low thermal resistance (RθJL = 15 °C/W), and compatibility with automated SMT assembly on 8 mm × 8 mm copper pads.
Technical Context
The SMCJ30CAHE3/57T operates as a silicon avalanche diode with symmetrical breakdown in both directions, enabling protection of AC-coupled or floating signal paths without polarity concerns. Its glass-passivated junction ensures stable leakage (<1 µA at 30 V) and repeatable clamping performance across temperature (-55 °C to +150 °C).
It responds to transients within picoseconds and maintains low incremental surge resistance during 10/1000 µs surges, delivering consistent clamping at 48.4 V up to 31.0 A. The device meets MSL Level 1 per J-STD-020 and supports lead-free reflow up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR min/max | 33.3 V / 36.8 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on margin above VWM. |
| VC @ IPPM | 48.4 V - Clamped voltage at 31.0 A peak pulse current (10/1000 µs); determines maximum stress imposed on downstream components. |
| PPPM | 1500 W - Peak pulse power dissipation capability; enables robust protection against IEC 61000-4-5 Level 4 surges. |
| ID @ VWM | ≤1.0 µA - Reverse leakage at 30 V; negligible power loss and minimal impact on high-impedance sensor or bias networks. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and industrial environments. |
| RθJL | 15 °C/W - Junction-to-lead thermal resistance; enables effective heat transfer to PCB copper pads without external heatsinking. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 7.11 mm × 6.22 mm × 2.62 mm (L × W × H). Matte tin-plated leads, J-STD-002 solderable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (reverse direction) | Accepts surge current when voltage exceeds VBR in negative polarity; forms symmetrical clamping path with cathode. |
| Cathode | Transient current entry (forward direction) | Accepts surge current when voltage exceeds VBR in positive polarity; completes bidirectional conduction path. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS power rails, with extended temperature cycling and humidity testing. |
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., CAN, RS-485), or ungrounded DC lines without polarity constraints. |
| 1500 W peak pulse power | Withstands 10/1000 µs surges up to 31.0 A - sufficient for IEC 61000-4-5 4 kV/2 Ω open-circuit tests on 12 V systems. |
| Glass-passivated junction | Ensures long-term stability of VBR and leakage parameters across 1000+ thermal cycles and high-humidity environments. |
| MSL Level 1 | Zero floor life limitation; can be stored indefinitely at ambient conditions and processed using standard Pb-free reflow profiles (260 °C peak). |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed between power rail and ground. Use Value: Limits transient voltage to ≤48.4 V during 31 A surges, preventing damage to 36 V-rated DC-DC converters and microcontrollers. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and switching noise in factory automation. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF) shunt protector on differential or single-ended signal traces. Use Value: Sub-µA leakage preserves signal integrity; fast response prevents latch-up in precision op-amps and ADC front-ends. |
| Telecom Line Interface Protection | Consumer Power Adapter Input Stage |
|
Use Scenario: Safeguarding PoE-powered Ethernet PHYs and line drivers against induced lightning surges. IC Role / Device Role / Timing Role: Primary-level surge suppressor on DC input side of isolated DC-DC modules. Use Value: 1500 W rating handles common-mode surges per IEC 61000-4-5; bidirectional symmetry avoids polarity-dependent failure modes. |
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters for smart home devices. IC Role / Device Role / Timing Role: Clamp diode across bulk capacitor or post-regulator output. Use Value: 30 V VWM aligns with 24 V nominal outputs; 48.4 V VC ensures downstream LDOs and USB controllers remain within absolute max ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30CAHE3/A | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (100 °C/W). | Suitable for lower-energy surges (e.g., IEC 61000-4-2 ESD only); limited to <10 A IPPM. | Select when board space is constrained and surge threat level is below 1 kV/42 Ω. |
| SMCJ33CAHE3/57T | Higher VWM (33 V), higher VBR (36.7–40.6 V), same SMC package and 1500 W rating. | Better suited for 36 V nominal systems where 30 V VWM risks false triggering during normal ripple. | Choose for 36 V automotive or industrial rails requiring tighter margin above nominal voltage. |
Compared with SMAJ30CAHE3/A, the SMCJ30CAHE3/57T delivers 3.75× higher surge energy handling and superior thermal coupling; versus SMCJ33CAHE3/57T, it offers lower clamping onset but requires verification against system ripple tolerance.
Availability
SMCJ30CAHE3/57T is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface design, and telecom line protection requiring stable component supply and AEC-Q101 compliance.
Supply support for SMCJ30CAHE3/57T 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, and protection devices with emphasis on reliability, automotive qualification, and high-power handling.
The SMCJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom infrastructure where robustness and AEC-Q101 validation are mandatory.
FAQ
What does the "CA" suffix indicate in SMCJ30CAHE3/57T?
The "CA" suffix denotes a bidirectional configuration - meaning the SMCJ30CAHE3/57T provides symmetrical transient voltage clamping in both polarities. Unlike unidirectional variants (e.g., SMCJ30A), it has no cathode band marking and protects AC-coupled or floating nodes without polarity sensitivity. This makes SMCJ30CAHE3/57T ideal for differential signal lines and dual-rail power systems.
Is SMCJ30CAHE3/57T qualified for automotive use?
Yes, SMCJ30CAHE3/57T carries the HE3 suffix, confirming it is RoHS-compliant and AEC-Q101 qualified. It undergoes stress testing for temperature cycling, humidity, mechanical shock, and surge endurance per AEC-Q101 Rev D. This qualification validates its use in engine control modules, body electronics, and ADAS subsystems where reliability under thermal and electrical stress is critical. SMCJ30CAHE3/57T is not just rated for automotive environments - it is certified for them.
What is the maximum clamping voltage of SMCJ30CAHE3/57T and at what current is it specified?
The maximum clamping voltage (VC) of SMCJ30CAHE3/57T is 48.4 V, measured at a peak pulse current (IPPM) of 31.0 A under the standardized 10/1000 µs double-exponential waveform. This value defines the upper voltage limit imposed on protected circuitry during worst-case surge events and is guaranteed across the full operating temperature range (−55 °C to +150 °C). Designers use this VC value to verify that downstream ICs and passives remain within their absolute maximum voltage ratings when SMCJ30CAHE3/57T is active.
How does the SMC (DO-214AB) package of SMCJ30CAHE3/57T compare thermally to smaller packages like SMA (DO-214AC)?
The SMC package used by SMCJ30CAHE3/57T provides significantly better thermal performance than SMA: its junction-to-lead resistance (RθJL) is 15 °C/W versus ~25 °C/W for SMA, and its larger copper pad footprint (8.0 mm × 8.0 mm per terminal) enables higher sustained power dissipation. This allows SMCJ30CAHE3/57T to maintain clamping performance during repeated surges and elevated ambient temperatures - a key advantage in under-hood automotive or enclosed industrial enclosures where airflow is limited.
Can SMCJ30CAHE3/57T replace SMCJ30A in an existing design?
No - SMCJ30CAHE3/57T is bidirectional while SMCJ30A is unidirectional, so direct substitution requires circuit review. SMCJ30A has a cathode band and conducts only in reverse bias; replacing it with SMCJ30CAHE3/57T introduces conduction in both directions, potentially disrupting DC biasing or causing unintended current paths. If bidirectional protection is needed, confirm layout compatibility and validate clamping behavior in both polarities. SMCJ30CAHE3/57T is not a drop-in replacement for SMCJ30A.
SMCJ30CAHE3/57T 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):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 31A
- 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)
SMCJ30CAHE3/57T FAQ
1.How can I place an order for SMCJ30CAHE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ30CAHE3/57T 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 SMCJ30CAHE3/57T reliable?
The price and inventory of SMCJ30CAHE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ30CAHE3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ30CAHE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ30CAHE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ30CAHE3/57T?
SMCJ30CAHE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ30CAHE3/57T 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 SMCJ30CAHE3/57T?
For technical support, including SMCJ30CAHE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ30CAHE3/57T requirements.
6.How does Aetrix verify that SMCJ30CAHE3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ30CAHE3/57T 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 SMCJ30CAHE3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ30CAHE3/57T?
All SMCJ30CAHE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ30CAHE3/57T, 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 SMCJ30CAHE3/57T part is unused and in its original packaging.
Return procedure for SMCJ30CAHE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ30CAHE3/57T Tags
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