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Taiwan Semiconductor Corporation SMCJ30CAH
- Part No.:
- SMCJ30CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ30CAH.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,748
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Product details
Overview
SMCJ30CAH from Taiwan Semiconductor is a bidirectional 30V standoff, 1500W surface-mount transient voltage suppressor (TVS) in DO-214AB (SMC) package, with 33.3–36.8V breakdown voltage, ≤1μA leakage at 30V, and 48.4V clamping voltage at 32A peak pulse current. It protects automotive and industrial power rails against ESD, load dump, and ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMCJ30CAH datasheet, SMCJ30CAH pinout, SMCJ30CAH application, or SMCJ30CAH equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, bidirectional clamping behavior, thermal resistance values (RθJC = 10°C/W), and direct alternatives for automotive-grade surge protection design.
Technical Context
The SMCJ30CAH employs a glass-passivated silicon junction optimized for fast transient response (<1.0 ps rise time from 0 V to VBR min) and low capacitance. Its bidirectional configuration enables symmetrical clamping in both polarities without external circuitry, meeting ISO 7637-2 test pulses across automotive subsystems.
Designed for surface-mount assembly, it supports automated placement and complies with J-STD-020 Level 1 moisture sensitivity. Thermal performance is defined by RθJA = 55°C/W and RθJC = 10°C/W, enabling reliable operation up to TJ = +150°C in constrained PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse working voltage before clamping begins |
| VBR @ IT = 1 mA | 33.3–36.8 V - Verified breakdown range ensuring predictable turn-on under surge conditions |
| VC @ IPPM = 32 A | 48.4 V - Clamped voltage during 10/1000 μs surge, limiting downstream stress |
| PPK | 1500 W - Peak pulse power handling per single 1 ms transient per Fig.5 |
| IR @ VWM | <1 μA - Low leakage preserves system standby power integrity |
| TJ Range | −55°C to +150°C - Full operational junction temperature range for under-hood and industrial environments |
Pinout & Package
DO-214AB (SMC) surface-mount package with cathode band marking for unidirectional variants; SMCJ30CAH is bidirectional and marked with polarity-indifferent coding (GFK). Leads are matte tin-plated, solderable per J-STD-002, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional transient conduction path | No polarity dependency - either terminal serves as input/output for surge suppression |
| Case (exposed metal pad) | Thermal conduction path | Integral heat dissipation surface; requires PCB copper pour for RθJA derating compliance |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TC, and UHAST |
| ISO 7637-2 compliance | Passes Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| Glass passivated junction | Enhances long-term reliability and stability of VBR under thermal cycling and humidity exposure |
| Fast response time | <1.0 ps from 0 V to VBR min ensures clamping initiates before sensitive ICs experience overvoltage damage |
Applications
| Automotive Power Distribution | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs (e.g., body control modules) from load dump and alternator transients. IC Role / Device Role / Timing Role: Primary bidirectional TVS placed at power entry point before DC-DC regulators. Use Value: Clamps 48.4 V at 32 A, limiting rail overshoot below 50 V to prevent damage to 40 V-rated LDOs and microcontrollers. | Use Scenario: Shielding 24 V digital input channels on programmable logic controllers from field-wiring induced surges. IC Role / Device Role / Timing Role: Front-end transient absorber on isolated input terminals interfacing with solenoids and sensors. Use Value: Withstands repetitive 1500 W pulses while maintaining <1 μA leakage, preserving signal integrity and reducing false triggering. |
| Telecom Power Supply Input | Consumer Appliance Motor Drive |
Use Scenario: Safeguarding AC/DC adapter primary-side rectifier outputs against lightning-induced surges on telecom infrastructure equipment. IC Role / Device Role / Timing Role: Secondary-side TVS on DC bus feeding PoE controllers and Ethernet PHYs. Use Value: 30 V working voltage aligns with 24–36 V intermediate bus rails; 48.4 V clamping prevents latch-up in IEEE 802.3af/at compliant ICs. | Use Scenario: Suppressing commutation spikes from brushed DC motors in home appliances (e.g., washing machine drum drives). IC Role / Device Role / Timing Role: Snubber-connected TVS across motor terminals to absorb inductive kickback. Use Value: 1500 W rating handles high-energy 8.3 ms half-sine surges (IFSM = 200 A), extending MOSFET lifetime and reducing EMI. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30CA | 600 W peak power, DO-214AA (SMB) package, higher RθJA (75°C/W) | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a (load dump) | Select when board space is constrained and surge energy does not exceed 600 W |
| 1.5KE30CA | Through-hole TO-218 package, same 1500 W rating but slower response (~1.5 ps), no AEC-Q101 qualification | Not suitable for automotive production; used in legacy industrial designs with manual assembly | Choose only for cost-sensitive non-automotive applications where SMT is not required |
Compared with SMBJ30CA and 1.5KE30CA, the SMCJ30CAH delivers higher surge robustness in a compact SMT footprint with automotive-grade reliability-making it the preferred choice for new ECU, ADAS, and industrial control designs requiring AEC-Q101 and ISO 7637-2 compliance.
Availability
SMCJ30CAH is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, telecom power supplies, and consumer appliance motor drive systems requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMCJ30CAH 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 computing markets since 1979.
The SMCJ series is part of TSC's AEC-Q101-qualified TVS portfolio, engineered specifically for high-reliability transient suppression in harsh automotive and industrial environments with stringent ISO 7637-2 and JESD22-A114 compliance.
FAQ
What is the clamping voltage of the SMCJ30CAH at its rated peak pulse current?
The SMCJ30CAH has a maximum clamping voltage (VC) of 48.4 V at 32 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuits during surge events. The SMCJ30CAH maintains this clamping performance across its full operating temperature range.
Is the SMCJ30CAH suitable for automotive applications?
Yes, the SMCJ30CAH is AEC-Q101 qualified and explicitly designed for automotive use. It meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements and operates reliably from −55°C to +150°C. Its glass-passivated junction and JESD201 Class 2 whisker resistance further ensure long-term stability in vehicle environments. The SMCJ30CAH is commonly deployed in body control modules, infotainment power rails, and ADAS sensor interfaces.
How does the 'CAH' suffix in SMCJ30CAH differ from 'CH'?
The 'CAH' suffix denotes the enhanced version with tighter breakdown voltage tolerance: SMCJ30CAH has VBR = 33.3–36.8 V (min/max), whereas SMCJ30CH is 33.3–40.7 V. Both are bidirectional and share identical package, power rating, and clamping performance. The SMCJ30CAH offers improved consistency for designs requiring precise turn-on voltage control, especially in multi-rail systems where margin stacking matters.
What is the thermal resistance from junction to case for the SMCJ30CAH?
The SMCJ30CAH has a junction-to-case thermal resistance (RθJC) of 10°C/W, measured under standard mounting conditions per JEDEC JESD51-14. This low value enables efficient heat transfer to the PCB copper pour, supporting sustained operation at elevated ambient temperatures. When designing thermal relief, ensure ≥25 mm² of 2-oz copper connected to both terminals to maintain RθJA ≤ 55°C/W.
Does the SMCJ30CAH require orientation-specific PCB layout?
No-the SMCJ30CAH is a bidirectional TVS diode with symmetrical terminal construction; neither anode nor cathode designation applies. Its DO-214AB (SMC) package has no polarity marking requirement, and the device functions identically regardless of installation orientation. This simplifies automated placement and eliminates risk of reverse-mount errors. The SMCJ30CAH is distinct from unidirectional variants (e.g., SMCJ30H), which require correct cathode alignment.
SMCJ30CAH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 32A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMC)
SMCJ30CAH FAQ
1.How can I place an order for SMCJ30CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ30CAH 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 SMCJ30CAH reliable?
The price and inventory of SMCJ30CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ30CAH is usually 5 days.
3.What payment methods are accepted for SMCJ30CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ30CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ30CAH?
SMCJ30CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ30CAH 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 SMCJ30CAH?
For technical support, including SMCJ30CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ30CAH requirements.
6.How does Aetrix verify that SMCJ30CAH is sourced from the original manufacturer or authorized distributors?
All SMCJ30CAH 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 SMCJ30CAH meets industry standards.
7.What is the process for return or replacement of SMCJ30CAH?
All SMCJ30CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ30CAH, 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 SMCJ30CAH part is unused and in its original packaging.
Return procedure for SMCJ30CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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