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Taiwan Semiconductor Corporation SMDJ30CAH
- Part No.:
- SMDJ30CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ30CAH.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,792
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Product details
Overview
SMDJ30CAH from Taiwan Semiconductor is a bidirectional 3000W transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 30 V working stand-off voltage (VWM), 33.3–36.8 V breakdown voltage (VBR), and 48.4 V maximum clamping voltage (VC) at 62.0 A peak pulse current. It is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump and switching transient protection.
For engineers reviewing the SMDJ30CAH datasheet, SMDJ30CAH pinout, SMDJ30CAH application, or SMDJ30CAH equivalent, key selection criteria include bidirectional clamping performance, 175°C junction temperature rating, moisture sensitivity level 1 compliance, fast sub-1 ps response time, and DO-214AB mechanical compatibility with automated SMT placement.
Technical Context
The SMDJ30CAH is a glass-passivated, single-die, bidirectional TVS diode designed to shunt high-energy transients away from sensitive downstream circuitry by entering avalanche conduction when reverse voltage exceeds its breakdown threshold. Its clamping behavior is characterized by low dynamic impedance and stable VC across rated IPPM.
It operates over –55°C to +175°C junction temperature range, supports 300 A non-repetitive forward surge (IFSM), and delivers 6.5 W steady-state power dissipation at 25°C ambient. Thermal resistance is 75°C/W junction-to-ambient and 15°C/W junction-to-lead, enabling robust thermal management in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR @ IT=1 mA | 33.3–36.8 V - Verified avalanche onset range under standardized test current |
| VC @ IPPM=62.0 A | 48.4 V - Clamped voltage during 10/1000 µs transient, limiting stress on protected ICs |
| PPK | 3000 W - Peak pulse power handling per IEC 61000-4-5 Level 4 and ISO 7637-2 |
| TJ max | +175°C - Enables operation in under-hood automotive and industrial high-temp environments |
| MSL | Level 1 (per J-STD-020) - No floor life limitation; safe for standard reflow without dry-packaging |
| Response time | <1.0 ps - Sub-picosecond junction response ensures protection before ESD or lightning-induced edges propagate |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, bidirectional configuration with cathode band omitted (symmetrical terminals). Molding compound meets UL 94V-0; matte tin-plated leads comply with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional transient path | No polarity marking required; identical clamping in both directions per datasheet note |
| Case (body) | Thermal mass & mechanical anchor | DO-214AB outline provides 0.290 g mass and 15°C/W RθJL for effective heat spreading |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated reliability for automotive powertrain and body electronics per stress-test requirements |
| ISO 7637-2 compliance | Guaranteed immunity to load-dump (Pulse 5a/5b), supply interruption (Pulse 2b), and coupling transients (Pulses 1/2a/3a/3b) |
| Glass passivated junction | Enhanced long-term stability and leakage control vs. epoxy-passivated alternatives |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU Directive 2011/65/EU for green manufacturing |
| Fast response & low clamping ratio | VC/VBR = 48.4/33.3 ≈ 1.45 - Tighter clamping than typical 1.6–2.0 ratios in legacy TVS devices |
Applications
| Automotive Power Distribution | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump spikes up to 35 V and ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Bidirectional clamping element placed at input filter stage to limit bus voltage excursion before DC-DC converter input. Use Value: Withstands 3000 W pulses while clamping to ≤48.4 V, preventing overvoltage shutdown or damage to upstream regulators and microcontrollers. | Use Scenario: Shielding 24 V digital input modules from field-wiring induced transients (e.g., relay coil flyback, motor commutation). IC Role / Device Role / Timing Role: Primary transient suppression device mounted directly at terminal block entry point. Use Value: 62.0 A peak current capacity and 175°C TJ rating ensure sustained protection in unventilated control cabinets with ambient temperatures up to 85°C. |
| Telecom Base Station Power Rails | Consumer Appliance Motor Drive Inputs |
Use Scenario: Safeguarding 48 V telecom rectifier outputs from lightning-induced surges coupled via AC mains or external cabling. IC Role / Device Role / Timing Role: Secondary-level TVS placed after bulk filtering but before point-of-load converters. Use Value: 3000 W PPK rating and 48.4 V VC enable compliance with IEC 61000-4-5 Level 4 (4 kV line-to-ground) without cascaded protection stages. | Use Scenario: Suppressing inductive kickback from brushed DC motors in washing machines or HVAC blowers connected to 24 V control boards. IC Role / Device Role / Timing Role: Low-inductance parallel clamp across motor driver H-bridge supply rails. Use Value: Sub-1 ps response ensures clamping activation before MOSFET gate oxide breakdown occurs during rapid dv/dt events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC30CA | Same VWM (30 V), lower PPK (1500 W), higher VC (53.3 V at 28 A), DO-214AB package | Rated for lower-energy transients; not suitable for ISO 7637-2 Pulse 5a or IEC 61000-4-5 Level 4 | Select only where system-level testing confirms 1500 W sufficiency and clamping margin allows 53.3 V |
| SMCJ30CA | Identical VWM (30 V), same PPK (3000 W), same VC (48.4 V), DO-214AB package, but not AEC-Q101 qualified | Lacks automotive qualification; may require additional reliability validation for vehicle programs | Acceptable for industrial or telecom use where AEC-Q101 is not mandated |
Compared with SAC30CA and SMCJ30CA, the SMDJ30CAH offers guaranteed AEC-Q101 qualification and identical high-power clamping performance-making it the sole choice when automotive-grade reliability and full ISO 7637-2 compliance are mandatory.
Availability
SMDJ30CAH is available at Aetrix Electronics and suitable for automotive power distribution, industrial PLC I/O protection, and telecom base station power rail applications requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for SMDJ30CAH 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, specializing in TVS diodes, rectifiers, MOSFETs, and automotive-qualified components.
The SMDJ series was developed specifically for high-reliability automotive and industrial transient suppression, emphasizing AEC-Q101 qualification, ISO 7637-2 compliance, and robust thermal performance in surface-mount packages.
FAQ
What does the "CAH" suffix indicate in SMDJ30CAH?
The "CAH" suffix denotes a bidirectional configuration with symmetrical clamping characteristics in both polarities. Unlike unidirectional variants (e.g., SMDJ30AH), the SMDJ30CAH has no cathode marking and provides identical VBR, VC, and IPPM performance regardless of voltage polarity-critical for protecting AC-coupled or floating signal lines and dual-rail power systems.
Is SMDJ30CAH compatible with lead-free reflow processes?
Yes, the SMDJ30CAH is fully compatible with standard lead-free reflow profiles (JEDEC J-STD-020 Class 1). Its moisture sensitivity level is rated MSL 1, meaning it can be stored indefinitely at ≤30°C/60% RH without baking prior to assembly. Matte tin-plated leads meet J-STD-002 solderability requirements for both SnPb and Pb-free solder pastes.
How does SMDJ30CAH differ from SMDJ30AH in circuit design?
The SMDJ30AH is unidirectional with a defined cathode band and forward voltage drop (~3.5 V at 100 A), while the SMDJ30CAH is bidirectional with no polarity marking and symmetric reverse/forward clamping. In designs requiring protection against both positive and negative transients-such as RS-485 buses or half-bridge motor drivers-the SMDJ30CAH eliminates the need for back-to-back unidirectional devices, simplifying layout and reducing component count.
Can SMDJ30CAH be used in place of older SMAJ30CA devices?
Yes, the SMDJ30CAH is a direct upgrade to SMAJ30CA, offering higher peak power (3000 W vs. 400 W), lower clamping voltage (48.4 V vs. ~49.9 V), and AEC-Q101 qualification. However, due to its larger DO-214AB (SMC) footprint versus SMAJ's DO-214AC (SMA), PCB pad redesign is required-SMDJ30CAH is not a drop-in replacement at the board level despite functional equivalence in protection capability.
What is the maximum allowable mounting density for SMDJ30CAH on a PCB?
Per thermal data, SMDJ30CAH has RθJA = 75°C/W. To maintain TJ ≤175°C at 25°C ambient, total power dissipation must stay below ~2.0 W in still air. For high-density layouts, maintain ≥2 mm clearance between adjacent SMDJ30CAH units and use ≥1 oz copper pour under the pad to improve heat spreading. The 0.290 g mass and DO-214AB outline support standard SMT placement at ≥0.5 mm pitch without tombstoning.
SMDJ30CAH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMDJ
- 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):
- 62A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMDJ30CAH FAQ
1.How can I place an order for SMDJ30CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ30CAH 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 SMDJ30CAH reliable?
The price and inventory of SMDJ30CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ30CAH is usually 5 days.
3.What payment methods are accepted for SMDJ30CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ30CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ30CAH?
SMDJ30CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ30CAH 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 SMDJ30CAH?
For technical support, including SMDJ30CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ30CAH requirements.
6.How does Aetrix verify that SMDJ30CAH is sourced from the original manufacturer or authorized distributors?
All SMDJ30CAH 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 SMDJ30CAH meets industry standards.
7.What is the process for return or replacement of SMDJ30CAH?
All SMDJ30CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ30CAH, 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 SMDJ30CAH part is unused and in its original packaging.
Return procedure for SMDJ30CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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