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Taiwan Semiconductor Corporation SMAJ7.0CA
- Part No.:
- SMAJ7.0CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.0CA.pdf
- Description:
- TVS DIODE 7VWM 12VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,229
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Product details
Overview
SMAJ7.0CA from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping ESD and surge transients in DC power rails. It features a 7.0 V working stand-off voltage (VWM), 7.78–9.51 V breakdown voltage (VBR) at 10 mA, 12.0 V maximum clamping voltage (VC) at 200 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the SMAJ7.0CA datasheet, SMAJ7.0CA pinout, SMAJ7.0CA application, or SMAJ7.0CA equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VBR ≈ 1.25), compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b, and suitability for automotive and industrial DC/DC converter protection where fast response (<1 ps) and <1 µA leakage above 10 V are critical.
Technical Context
The SMAJ7.0CA implements a glass-passivated silicon avalanche junction optimized for unidirectional or bidirectional transient suppression. Its bidirectional configuration (denoted by "CA") enables symmetrical clamping in both polarities without external polarity management, supporting robust protection of floating or AC-coupled signal lines and dual-rail supplies.
It delivers sub-nanosecond response (typically <1.0 ps from 0 V to VBR min) and maintains clamping performance across -55°C to +150°C operating junction temperature. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements, confirming suitability for high-reliability surface-mount assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.0 V - Maximum continuous reverse voltage before significant leakage; sets upper limit for protected circuit's normal operating voltage. |
| VBR @ IT=10 mA | 7.78–9.51 V - Breakdown onset range; ensures reliable triggering above nominal rail while avoiding false trips during tolerance drift. |
| VC @ IPPM=200 A | 12.0 V - Clamped voltage under 10/1000 µs surge; limits downstream stress to ≤12 V during 400 W transient events. |
| IR @ VWM | <1 µA - Ultra-low leakage at stand-off; prevents measurable power loss or bias shift in high-impedance monitoring circuits. |
| PPPM | 400 W - Peak pulse power handling per 10/1000 µs waveform; supports automotive load-dump and ISO 7637-2 Pulse 5a simulation. |
| Package | DO-214AC (SMA) - Standardized SMT footprint (4.5 × 2.7 mm); compatible with automated pick-and-place and reflow profiles per J-STD-020 Level 1. |
| Polarity | Bidirectional - Cathode band absent; symmetric I-V curve enables use on AC lines or ungrounded rails without orientation constraints. |
Pinout & Package
DO-214AC (SMA) package: surface-mount, two-terminal, molded plastic case with matte tin-plated leads. Polarity is non-directional for SMAJ7.0CA (bidirectional), indicated by absence of cathode band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; connects across protected line and return-no orientation required during placement. |
| Case | Non-electrical mechanical interface | Plastic body provides insulation and thermal mass; no electrical connection or heatsinking function. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over lifetime and humidity exposure; eliminates risk of junction corrosion in humid environments. |
| ISO 7637-2 compliance | Validated against Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (capacitive coupling); meets automotive OEM requirements out-of-box. |
| Fast response time <1.0 ps | Clamps transients before propagation into sensitive ICs; critical for protecting high-speed logic and microcontroller reset lines. |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; supports standard SMT production flow without dry-pack or floor-life management. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive; suitable for consumer, industrial, and automotive applications with strict material declarations. |
Applications
| Automotive Infotainment Power Rail | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Protecting 5 V/12 V supply inputs of head unit MCUs and display drivers against load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed at board edge before LDO regulators and PMICs. Use Value: Limits transient overshoot to ≤12.0 V during 400 W pulses, preventing latch-up or gate oxide damage in downstream 12 V tolerant ICs. | Use Scenario: Shielding 24 V digital input modules from field-wiring induced surges and relay coil flyback. IC Role / Device Role / Timing Role: Primary surge shunt across input terminals, upstream of optocoupler or Schmitt trigger interface. Use Value: Sub-1 ps response ensures clamping initiates before 100 ns logic-level transitions are corrupted; <1 µA leakage avoids false triggering in high-impedance sensing. |
| LED Driver Constant-Current Supply | On-Board DC/DC Converter Input Stage |
Use Scenario: Safeguarding buck controller ICs and MOSFET gates in automotive LED headlamp drivers subjected to PWM noise and hot-swap transients. IC Role / Device Role / Timing Role: Parallel-connected TVS across input capacitor bank to absorb repetitive 10/1000 µs spikes from switching node coupling. Use Value: 400 W rating sustains >100,000 surge events per MIL-STD-883H Method 3015.8; DO-214AC thermal mass dissipates energy without derating below 125°C ambient. | Use Scenario: Input-side transient suppression for isolated 48 V-to-12 V DC/DC modules in telecom base stations and server PSUs. IC Role / Device Role / Timing Role: First-line defense against lightning-induced surges entering via backplane connectors or PoE injectors. Use Value: Bidirectional symmetry allows single-device protection of floating secondary-side rails; clamping voltage margin (12.0 V vs. 12 V rail) guarantees safe operation without crowbar activation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.0A | Unidirectional; VBR min = 7.78 V, VC = 12.0 V, same IPPM = 200 A, but requires correct polarity orientation. | Only suitable where circuit ground reference is fixed and polarity is known; cannot protect AC-coupled or floating nodes. | Select SMAJ7.0A only when layout constraints mandate unidirectional placement and system grounding is strictly controlled. |
| SMBJ7.0CA | Same VWM/VBR/VC specs, but in larger DO-214AA (SMB) package; 600 W PPPM rating (vs. 400 W). | Higher power handling supports longer surge durations or repeated events; footprint incompatible with SMA land pattern. | Choose SMBJ7.0CA when surge energy exceeds 400 W or thermal budget requires larger thermal mass; redesign PCB pad layout required. |
Compared with SMAJ7.0A, SMAJ7.0CA eliminates polarity dependency and simplifies layout; compared with SMBJ7.0CA, it trades 200 W peak power for space-constrained DO-214AC compatibility-making SMAJ7.0CA optimal for compact automotive and industrial modules where bidirectional protection and minimal footprint are prioritized.
Availability
SMAJ7.0CA is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial programmable logic controllers (PLCs), and LED lighting drivers requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ7.0CA 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 engineered specifically for automotive-grade transient suppression, targeting ISO 7637-2 compliance and AEC-Q101 qualification readiness in compact surface-mount packages for space-constrained ECUs and power modules.
FAQ
What is the clamping voltage of SMAJ7.0CA under a 200 A 10/1000 µs surge?
The SMAJ7.0CA clamps to a maximum of 12.0 V when subjected to a 200 A peak impulse current with a 10/1000 µs waveform. This value is measured per standard test conditions (TA = 25°C) and defines the upper voltage limit imposed on protected circuitry during surge events. The low clamping ratio (VC/VBR ≈ 1.25) ensures effective protection without overstressing downstream 12 V tolerant components. SMAJ7.0CA maintains this performance across its full operating temperature range.
Does SMAJ7.0CA require orientation during PCB placement?
No, SMAJ7.0CA does not require orientation during PCB placement because it is a bidirectional TVS diode. Unlike unidirectional variants (e.g., SMAJ7.0A), SMAJ7.0CA has identical electrical characteristics in both directions and lacks a cathode band marking. This symmetry allows unrestricted placement on two-pad DO-214AC footprints, reducing assembly errors and enabling protection of floating or AC-coupled nodes without polarity analysis. SMAJ7.0CA's design inherently supports this flexibility.
Is SMAJ7.0CA compliant with automotive transient standards?
Yes, SMAJ7.0CA meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a/2b (battery feed interruption), and Pulse 3a/3b (capacitive coupling), as confirmed in Taiwan Semiconductor's official documentation. Its 400 W peak pulse power rating, fast <1.0 ps response, and stable clamping behavior under temperature stress make it suitable for front-end protection in automotive ECUs, body control modules, and infotainment systems. SMAJ7.0CA is designed to support AEC-Q101 qualification pathways.
What is the maximum steady-state power dissipation for SMAJ7.0CA?
The maximum steady-state power dissipation (PD) for SMAJ7.0CA is 1 W at TA = 25°C, as specified in the Absolute Maximum Ratings table. This value represents continuous DC or low-frequency power handling capability-not surge-related. In practical applications, SMAJ7.0CA operates near zero power under normal conditions due to <1 µA leakage at 7.0 V, making its 1 W PD rating relevant only during sustained overvoltage faults beyond VWM. SMAJ7.0CA's thermal design relies on PCB copper area for transient energy dissipation, not steady-state conduction.
How does SMAJ7.0CA compare to SMAJ7.0 in terms of functionality?
SMAJ7.0CA is the bidirectional version, while SMAJ7.0 is unidirectional. Both share identical VWM (7.0 V), VBR (7.78–9.51 V), and VC (12.0 V) ratings, but SMAJ7.0 requires correct anode/cathode orientation and only clamps in reverse bias. SMAJ7.0CA clamps symmetrically in both directions, eliminating orientation concerns and enabling protection of AC signals or floating rails. For designs needing polarity-agnostic protection, SMAJ7.0CA is functionally superior-and SMAJ7.0CA is the appropriate choice unless unidirectional behavior is explicitly required.
SMAJ7.0CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ7.0CA FAQ
1.How can I place an order for SMAJ7.0CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.0CA 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 SMAJ7.0CA reliable?
The price and inventory of SMAJ7.0CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.0CA is usually 5 days.
3.What payment methods are accepted for SMAJ7.0CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.0CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.0CA?
SMAJ7.0CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.0CA 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 SMAJ7.0CA?
For technical support, including SMAJ7.0CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.0CA requirements.
6.How does Aetrix verify that SMAJ7.0CA is sourced from the original manufacturer or authorized distributors?
All SMAJ7.0CA 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 SMAJ7.0CA meets industry standards.
7.What is the process for return or replacement of SMAJ7.0CA?
All SMAJ7.0CA units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.0CA, 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 SMAJ7.0CA part is unused and in its original packaging.
Return procedure for SMAJ7.0CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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