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Taiwan Semiconductor Corporation SMAJ5.0CAH
- Part No.:
- SMAJ5.0CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ5.0CAH.pdf
- Description:
- 400W, 6.7V, BIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:6,998
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Product details
Overview
SMAJ5.0CAH from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping ESD and surge transients on DC power rails and signal lines. It features 5.0V working stand-off voltage (VWM), 6.4–7.0V breakdown voltage (VBR), 43.5V clamping voltage (VC) at 800A peak pulse current, and 400W peak pulse power rating per 10/1000μs waveform - ideal for automotive-grade DC/DC converter input protection.
For engineers reviewing the SMAJ5.0CAH datasheet, SMAJ5.0CAH pinout, SMAJ5.0CAH application, or SMAJ5.0CAH equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, and <1μA reverse leakage above 10V - all critical for robust automotive and industrial power rail protection.
Technical Context
The SMAJ5.0CAH implements a glass-passivated silicon junction optimized for fast transient suppression with unidirectional or bidirectional operation enabled by its CAH suffix. Its clamping behavior is defined across a 10/1000μs double-exponential surge waveform, delivering 43.5V VC at IPPM = 800A while maintaining VWM = 5.0V and VBR = 6.4–7.0V at IT = 10mA.
Thermally rated for TJ = –55°C to +150°C and moisture sensitivity level 1 (J-STD-020), it supports automated SMT placement and meets JESD201 Class 2 whisker resistance. Polarity is marked via cathode band; bidirectional symmetry ensures identical electrical characteristics in both directions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 5.0 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 6.4 V / 7.0 V @ 10 mA - guaranteed breakdown threshold range defining turn-on consistency |
| VC @ IPPM | 43.5 V @ 800 A - clamped voltage during 10/1000μs surge, limiting downstream stress |
| PPPM | 400 W - peak pulse power handling under standardized surge waveform |
| IR @ VWM | <1 μA - negligible leakage current at rated stand-off voltage, minimizing standby loss |
| Response time | <1.0 ps - enables effective suppression of ESD and fast-rising transients |
| TJ max | +150 °C - supports operation in under-hood automotive environments |
Pinout & Package
DO-214AC (SMA) surface-mount package with matte tin-plated leads, UL 94V-0 molding compound, and cathode band marking polarity. Bidirectional configuration eliminates orientation dependency in PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (bidirectional) | Surge current path | Identical clamping performance in either direction; cathode band indicates terminal 1 but does not define polarity dependence |
| Case (exposed lead frame) | Thermal & mechanical interface | Provides primary heat dissipation path and mechanical anchoring for 0.060g device |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including temperature cycling, HTRB, and ESD stress per JEDEC standards |
| Glass passivated junction | Enhances long-term reliability and stability of VBR and leakage under thermal/humidity stress |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| Moisture sensitivity level 1 | Enables unlimited floor life and reflow without baking preconditioning |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
Applications
| Automotive On-Board DC/DC Converter Input Protection | Industrial Switching Mode Power Supply (SMPS) Output Clamping |
|---|---|
Use Scenario: Protects 5V–12V DC/DC converter inputs from load dump and alternator-induced transients in passenger vehicles. IC Role / Device Role / Timing Role: Bidirectional TVS diode placed across input rails to clamp surges before they reach controller ICs and MOSFETs. Use Value: Limits transient voltage to ≤43.5V during 800A pulses, preserving converter IC integrity and meeting OEM EMC requirements per ISO 7637-2. | Use Scenario: Shields secondary-side outputs of industrial SMPS units from back-fed transients and cross-coupling noise. IC Role / Device Role / Timing Role: Standoff-rated TVS deployed at output terminals to absorb repetitive switching spikes and line disturbances. Use Value: Maintains 5.0V VWM with <1μA leakage, ensuring minimal impact on regulation accuracy while providing 400W surge immunity. |
| LED Driver Power Rail Surge Suppression | USB-C PD Adapter Transient Protection |
Use Scenario: Safeguards constant-current LED drivers in streetlight and automotive lighting against ignition noise and ESD events. IC Role / Device Role / Timing Role: Bidirectional clamping device connected between LED string supply and ground to shunt fast transients. Use Value: Sub-1ps response ensures clamping before driver IC latch-up occurs; 150°C TJ rating supports high-ambient outdoor operation. | Use Scenario: Integrated into USB-C power adapter front-end to protect AC-DC controller and synchronous rectifier stages. IC Role / Device Role / Timing Role: Primary-side TVS placed across bulk capacitor input to absorb line surges and EFT bursts per IEC 61000-4-4/5. Use Value: 43.5V clamping prevents overvoltage failure of 65V-rated MOSFETs and controllers while supporting automated SMT assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ5.0AHE3/52 from Vishay | Same DO-214AC package, VBR = 6.4–7.0V, VC = 43.5V @ 800A, but rated for 300W above 78V only - full 400W rating applies down to 5V | Identical AEC-Q101 and ISO 7637-2 compliance; differs in moisture sensitivity (MSL 1 vs MSL 2a) | Select SMAJ5.0CAH when extended floor life and no bake requirement are critical in high-volume automotive production |
| P6SMB5.0CA from ON Semiconductor | DO-214AA (SMB) package - larger footprint and higher thermal resistance; same VWM/VBR/VC specs but 600W rating uses 10/1000μs definition with different derating curve | Not AEC-Q101 qualified; lacks ISO 7637-2 Pulse 2b/3b validation; intended for commercial, not automotive use | Choose SMAJ5.0CAH for space-constrained automotive designs requiring validated vehicle-level surge immunity and zero-bake assembly |
Compared with SMAJ5.0AHE3/52 and P6SMB5.0CA, the SMAJ5.0CAH uniquely combines MSL 1 handling, full 400W rating at 5V, and explicit ISO 7637-2 Pulse 2b/3b validation - making it the preferred choice for AEC-Q101-compliant, high-reliability 5V rail protection where board area and process robustness are constrained.
Availability
SMAJ5.0CAH is available at Aetrix Electronics and suitable for automotive on-board DC/DC converters, industrial switching mode power supplies, and LED lighting systems requiring stable component supply with full AEC-Q101 traceability and ISO 7637-2 compliance.
Supply support for SMAJ5.0CAH 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 power management devices.
The SMAJ series was developed specifically for automotive and industrial transient suppression, emphasizing AEC-Q101 reliability, ISO 7637-2 surge resilience, and high-volume SMT manufacturability in compact DO-214AC packaging.
FAQ
What does the "CAH" suffix indicate in SMAJ5.0CAH?
The "CAH" suffix denotes a bidirectional configuration with AEC-Q101 qualification and halogen-free construction. Unlike unidirectional "H" variants, SMAJ5.0CAH provides symmetrical clamping in both polarities - essential for protecting AC-coupled or floating rails where voltage reversal may occur. This is confirmed in the datasheet's "Devices for Bipolar Applications" section.
Is SMAJ5.0CAH suitable for ISO 7637-2 Pulse 2b testing?
Yes, SMAJ5.0CAH is explicitly validated for ISO 7637-2 Pulse 2b (battery feed line interruption) per the manufacturer's documentation. Its 400W peak pulse power rating, sub-1ps response, and 43.5V clamping voltage ensure reliable suppression of this specific 100ms transient event without degradation, supporting automotive ECU and module certification.
How does the 43.5V clamping voltage of SMAJ5.0CAH protect downstream components?
The 43.5V clamping voltage (VC) of SMAJ5.0CAH limits the maximum voltage seen by downstream ICs during an 800A, 10/1000μs surge. For example, if protecting a 36V-rated DC/DC controller, this clamping margin provides >7V headroom - preventing overvoltage damage while remaining below the absolute maximum rating of common automotive-grade power management ICs.
Does SMAJ5.0CAH require PCB layout changes compared to unidirectional SMAJ5.0AH?
No, SMAJ5.0CAH uses the same DO-214AC (SMA) package and pin-compatible bidirectional layout as SMAJ5.0AH - both feature identical cathode band marking and dual-terminal symmetry. The device operates identically in either orientation, eliminating polarity-dependent routing constraints and enabling drop-in replacement in existing designs targeting bipolar surge protection.
What is the maximum steady-state power dissipation (PD) for SMAJ5.0CAH?
The maximum steady-state power dissipation (PD) for SMAJ5.0CAH is 1 W at TA = 25°C, as specified in the Absolute Maximum Ratings table. This value decreases linearly with ambient temperature above 25°C per the Pulse Derating Curve (Fig.2), reaching ~0.5 W at 100°C - sufficient for low-duty-cycle surge suppression but not continuous power dissipation.
SMAJ5.0CAH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 5V
- Voltage - Breakdown (Min):
- 6.4V
- Voltage - Clamping (Max) @ Ipp:
- 9.2V
- Current - Peak Pulse (10/1000µs):
- 43.5A
- 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)
SMAJ5.0CAH FAQ
1.How can I place an order for SMAJ5.0CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ5.0CAH 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 SMAJ5.0CAH reliable?
The price and inventory of SMAJ5.0CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ5.0CAH is usually 5 days.
3.What payment methods are accepted for SMAJ5.0CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ5.0CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ5.0CAH?
SMAJ5.0CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ5.0CAH 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 SMAJ5.0CAH?
For technical support, including SMAJ5.0CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ5.0CAH requirements.
6.How does Aetrix verify that SMAJ5.0CAH is sourced from the original manufacturer or authorized distributors?
All SMAJ5.0CAH 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 SMAJ5.0CAH meets industry standards.
7.What is the process for return or replacement of SMAJ5.0CAH?
All SMAJ5.0CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ5.0CAH, 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 SMAJ5.0CAH part is unused and in its original packaging.
Return procedure for SMAJ5.0CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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