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Taiwan Semiconductor Corporation SMAJ7.0CAH
- Part No.:
- SMAJ7.0CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.0CAH.pdf
- Description:
- 400W, 8.2V, BIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:2,804
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Product details
Overview
SMAJ7.0CAH from Taiwan Semiconductor is a bidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for automotive-grade surge protection on DC power rails and signal lines. It features a 7.0V working stand-off voltage (VWM), 7.78–8.60V breakdown voltage (VBR), and clamps transients to ≤12.0V at 200A peak pulse current under 10/1000μs waveform.
For engineers reviewing the SMAJ7.0CAH datasheet, SMAJ7.0CAH pinout, SMAJ7.0CAH application, or SMAJ7.0CAH equivalent, this device is selected for AEC-Q101-compliant automotive electronics requiring fast (<1ps) response, low leakage (<7µA @ VWM), ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and robust clamping in space-constrained surface-mount layouts.
Technical Context
The SMAJ7.0CAH is a bipolar junction TVS diode with symmetrical reverse/forward clamping behavior-electrical characteristics apply identically in both directions. Its glass-passivated chip junction ensures stable breakdown and low leakage across -55°C to +150°C operating range.
It delivers 400W peak pulse power (10/1000μs) up to 78V VWM; above that, rating drops to 300W. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity, supporting reflow-compatible automated assembly without preconditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.0 V - Maximum continuous DC or RMS voltage the device blocks without significant leakage |
| VBR min/max | 7.78 V / 8.60 V @ 10 mA - Confirmed breakdown threshold range defining turn-on consistency |
| VC @ IPPM | 12.0 V @ 200 A - Clamped voltage during worst-case 10/1000μs surge, limiting downstream IC stress |
| PPPM | 400 W (10/1000μs) - Peak transient energy absorption capability before failure |
| IR @ VWM | <7 µA - Ultra-low reverse leakage preserves battery life and signal integrity in always-on systems |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and high-power industrial enclosures |
| Package | DO-214AC (SMA) - Industry-standard 2-pin SMD outline with 0.060 g mass and UL 94V-0 molding compound |
Pinout & Package
DO-214AC (SMA) package: surface-mount, bi-directional, cathode band not applicable (bidirectional symmetry). Matte tin-plated leads, polarity-marked per device orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Either terminal serves as input/output; no polarity dependency-enables flexible PCB routing |
| Case (exposed lead frame) | Thermal and mechanical anchor | Provides primary heat dissipation path to PCB copper; supports 1W steady-state derating |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics including engine control units, body controllers, and ADAS sensors |
| Clamping ratio VC/VBR | ≤1.54 - Tight ratio ensures predictable overvoltage limiting without excessive margin overhead |
| Response time | <1.0 ps - Sub-picosecond junction switching prevents ESD or lightning-induced latch-up in sensitive analog front-ends |
| ISO 7637-2 compliance | Pulse 1 (inductive load dump), 2a/2b (supply interruption), 3a/3b (capacitive coupling) - Full vehicle-level EMC immunity coverage |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU Directive 2011/65/EU - Supports green manufacturing and end-of-life recycling |
Applications
| Automotive Infotainment Power Rail | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Protecting 5V/12V supply inputs of head unit MCUs and display drivers against load dump and jump-start surges. IC Role / Device Role / Timing Role: Bidirectional clamping TVS placed upstream of LDOs and PMICs to absorb >400W transients without crowbarring. Use Value: Prevents MCU reset or flash corruption during 12V rail disturbances while maintaining <7µA standby leakage. |
Use Scenario: Safeguarding 24V digital input modules from field-wiring induced transients in factory automation cabinets. IC Role / Device Role / Timing Role: Primary surge shunt on DIN-rail mounted I/O terminals, rated for repeated 10/1000μs pulses per IEC 61000-4-5. Use Value: Enables 150°C ambient operation in enclosed control panels and eliminates need for external heatsinking. |
| LED Driver Input Stage | On-Board DC/DC Converter Input |
Use Scenario: Suppressing switching noise and inductive kickback in constant-current LED drivers for automotive lighting. IC Role / Device Role / Timing Role: Fast-clamping TVS across input capacitors to prevent overvoltage damage to buck controller ICs. Use Value: Maintains luminance stability by clamping to ≤12.0V before driver IC overvoltage lockout triggers. |
Use Scenario: Protecting 48V-to-12V buck converter inputs in electric vehicle auxiliary power units from battery line transients. IC Role / Device Role / Timing Role: First-line defense against ISO 7637-2 Pulse 5a (load dump), placed directly at connector entry point. Use Value: Withstands 400W peak power without degradation, ensuring uninterrupted DC/DC operation during 12V system faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ7.0CA | Identical VWM (7.0V), VBR (7.78–8.60V), and VC (12.0V); same DO-214AC package but non-AEC-Q101 rated | Not qualified for automotive use; suitable for industrial/commercial designs without AEC validation requirements | Select when AEC-Q101 compliance is not mandated and cost optimization is prioritized |
| ON Semiconductor SMAJ7.0A | Unidirectional variant (suffix 'A'), requires correct polarity placement; VBR min 7.78V, VC 12.0V, but lacks bidirectional symmetry | Cannot replace SMAJ7.0CAH in AC-coupled or polarity-agnostic circuits without layout revision | Choose only if circuit topology guarantees fixed polarity and automotive qualification is secondary |
Compared with Littelfuse SMAJ7.0CA and ON Semi SMAJ7.0A, the SMAJ7.0CAH uniquely combines AEC-Q101 qualification, true bidirectionality, and identical clamping performance-making it the sole drop-in solution for automotive power rail protection where polarity flexibility and qualification are mandatory.
Availability
SMAJ7.0CAH is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial programmable logic controllers, and LED lighting drivers requiring stable component supply with full AEC-Q101 traceability and long-term lifecycle support.
Supply support for SMAJ7.0CAH 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers with global automotive and industrial certifications.
The SMAJ series was developed specifically for AEC-Q101-compliant transient suppression in harsh-environment automotive electronics, emphasizing reliability, fast response, and standardized DO-214AC packaging for high-volume SMT deployment.
FAQ
What does the 'CAH' suffix indicate in SMAJ7.0CAH?
The 'CAH' suffix denotes a bidirectional (C), AEC-Q101 qualified (A), and halogen-free (H) variant of the SMAJ7.0CAH TVS diode. Unlike unidirectional 'A' versions, the 'C' confirms symmetrical clamping in both directions-critical for protecting AC-coupled or polarity-agnostic circuits without requiring orientation-aware PCB layout.
Is SMAJ7.0CAH compatible with lead-free reflow soldering processes?
Yes, SMAJ7.0CAH is fully compatible with standard lead-free reflow profiles. Its matte tin-plated leads meet J-STD-002 solderability requirements, and its DO-214AC package is rated for peak temperatures up to 260°C per J-STD-020 Level 1, eliminating need for moisture preconditioning prior to assembly.
How does SMAJ7.0CAH perform under repeated surge events?
SMAJ7.0CAH is rated for non-repetitive 10/1000μs pulses per Fig.5 in the datasheet. While it withstands single 400W surges reliably, repeated events require thermal derating per Fig.2-above 25°C ambient, peak power decreases linearly to ~240W at +100°C, ensuring safe operation in sustained high-temp environments.
Does SMAJ7.0CAH meet ISO 7637-2 Pulse 5a (load dump) requirements?
No-SMAJ7.0CAH is rated for ISO 7637-2 Pulses 1, 2a, 2b, 3a, and 3b, but not Pulse 5a (load dump), which demands higher energy handling. For Pulse 5a, higher-voltage variants like SMAJ15CAH or dedicated load-dump suppressors are required; SMAJ7.0CAH targets lower-energy transients typical of data lines and auxiliary rails.
What is the maximum clamping voltage of SMAJ7.0CAH at its rated peak current?
The maximum clamping voltage (VC) of SMAJ7.0CAH is 12.0 V at 200 A peak impulse current (IPPM) under the standard 10/1000μs waveform. This value is guaranteed across temperature and lot variations, providing deterministic overvoltage protection for downstream 12V-tolerant ICs.
SMAJ7.0CAH 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):
- 7V
- Voltage - Breakdown (Min):
- 7.78V
- Voltage - Clamping (Max) @ Ipp:
- 12V
- Current - Peak Pulse (10/1000µs):
- 33.3A
- 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)
SMAJ7.0CAH FAQ
1.How can I place an order for SMAJ7.0CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.0CAH 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 SMAJ7.0CAH reliable?
The price and inventory of SMAJ7.0CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.0CAH is usually 5 days.
3.What payment methods are accepted for SMAJ7.0CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.0CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.0CAH?
SMAJ7.0CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.0CAH 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 SMAJ7.0CAH?
For technical support, including SMAJ7.0CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.0CAH requirements.
6.How does Aetrix verify that SMAJ7.0CAH is sourced from the original manufacturer or authorized distributors?
All SMAJ7.0CAH 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 SMAJ7.0CAH meets industry standards.
7.What is the process for return or replacement of SMAJ7.0CAH?
All SMAJ7.0CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.0CAH, 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 SMAJ7.0CAH part is unused and in its original packaging.
Return procedure for SMAJ7.0CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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