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Taiwan Semiconductor Corporation SMAJ7.0C
- Part No.:
- SMAJ7.0C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.0C.pdf
- Description:
- 400W, 8.6V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:3,783
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Product details
Overview
SMAJ7.0C from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with 7.0V working stand-off voltage (VWM), 7.78–9.51V breakdown voltage (VBR), and 13.3V maximum clamping voltage (VC) at 200A peak pulse current. It protects DC/DC converters and SMPS inputs against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMAJ7.0C datasheet, SMAJ7.0C pinout, SMAJ7.0C application, or SMAJ7.0C equivalent, this page delivers verified electrical specs, clamping behavior under 10/1000μs surge, thermal derating curves, moisture sensitivity level (MSL 1), and RoHS/halogen-free compliance - all critical for automotive-grade power rail protection design.
Technical Context
The SMAJ7.0C operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (7.78–9.51V @ 10mA). Its glass-passivated junction ensures stable breakdown and low leakage (<7µA @ 7.0V).
It delivers 400W peak pulse power (10/1000μs waveform) up to 78V VWM; above that, rating drops to 300W. Clamping occurs within <1.0ps, limiting induced voltage to ≤13.3V at 200A - enabling robust protection of 5V–12V logic and power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.0 V - Maximum continuous reverse operating voltage before conduction begins; sets upper limit for protected circuit's normal operating range. |
| VBR min/max | 7.78 V / 9.51 V @ 10 mA - Confirmed breakdown threshold range; ensures reliable turn-on during overvoltage events without premature triggering. |
| VC @ IPPM | 13.3 V @ 200 A - Clamped voltage during worst-case 10/1000μs surge; defines maximum stress imposed on downstream ICs. |
| PPPM | 400 W (10/1000μs) - Peak surge energy handling capacity; sufficient for ISO 7637-2 Pulse 1 (inductive load dump) and Pulse 2b (battery disconnect). |
| IR @ VWM | <7 µA - Reverse leakage at rated stand-off; negligible power loss and signal integrity impact in standby or low-power modes. |
| TJ max | 150 °C - Maximum junction temperature; supports operation in under-hood automotive environments and high-ambient industrial power supplies. |
Pinout & Package
DO-214AC (SMA) surface-mount package: cathode-banded end denotes polarity; matte tin-plated leads compliant with J-STD-002 solderability; UL 94V-0 molding compound; MSL Level 1 per J-STD-020; weight ≈ 0.060 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-voltage return path; completes clamping loop during transient events. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., +12V rail); conducts avalanche current to anode when VREV > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable, repeatable VBR across temperature and lifetime; eliminates parameter drift due to environmental oxidation or contamination. |
| Fast response time <1.0 ps | Clamps transients before sensitive downstream components experience damaging voltage overshoot - critical for protecting fast-switching MOSFET gates and microcontroller I/O. |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive power network immunity; meets OEM requirements for ECU, body control module, and infotainment power inputs. |
| RoHS and halogen-free (IEC 61249-2-21) | Enables global market access and simplifies end-product environmental certification; avoids brominated flame retardants in PCB assembly. |
Applications
| Switching Mode Power Supply (SMPS) | On-board DC/DC Converter |
|---|---|
Use Scenario: Input stage protection against load dump and battery reversal spikes in 24V industrial SMPS units. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between input capacitor and primary-side controller IC. Use Value: Limits transient voltage to ≤13.3V, preventing gate oxide rupture in PWM controllers and overvoltage latch-up in auxiliary bias circuits. | Use Scenario: 5V-to-3.3V buck converter powering FPGA configuration memory in telecom baseband cards. IC Role / Device Role / Timing Role: Secondary-side rail protector located upstream of LDO input, absorbing coupling noise from adjacent switching regulators. Use Value: Maintains <7µA leakage at 5V nominal, avoiding quiescent current penalty while clamping coupled surges to safe levels for 3.3V logic. |
| Automotive Lighting Module | Adapter Power Input Stage |
Use Scenario: LED driver input protection in headlamp ECU subjected to ISO 7637-2 Pulse 2b (battery disconnect). IC Role / Device Role / Timing Role: Primary surge suppression device mounted directly at connector entry point. Use Value: Withstands 200A peak impulse without degradation, ensuring functional safety compliance (ASIL-B) for lighting system continuity. | Use Scenario: AC/DC adapter output filtering for USB-C PD chargers exposed to mains-borne fast transients. IC Role / Device Role / Timing Role: Final-stage overvoltage limiter after secondary-side rectification and bulk capacitance. Use Value: 13.3V clamping voltage aligns with USB-PD 5V/9V/15V profiles, preventing overvoltage damage to protocol ICs during surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.0A | Lower VBR range (7.78–8.60V vs. 7.78–9.51V); tighter tolerance; same VC (12.0V @ 200A) and VWM (7.0V). | Better suited for precision-clamp designs where lower VBR variation reduces margin uncertainty. | Select SMAJ7.0A when tighter VBR distribution is required; SMAJ7.0C offers broader breakdown range for cost-sensitive volume production. |
| P6SMB7.0A | Same DO-214AA package (not DO-214AC); 400W rating; VBR 7.78–8.60V; VC 12.0V @ 200A; slightly higher IR (≤10µA). | Compatible footprint but requires pad layout verification; not qualified to ISO 7637-2 Pulse 3b. | Choose P6SMB7.0A only if DO-214AA is already standardized in BOM; SMAJ7.0C provides superior automotive qualification and DO-214AC mechanical robustness. |
Compared with SMAJ7.0A and P6SMB7.0A, the SMAJ7.0C delivers wider VBR tolerance for manufacturing flexibility, full ISO 7637-2 compliance including Pulse 3b, and DO-214AC package with enhanced thermal dissipation and JESD201 Class 2 whisker resistance - making it optimal for automotive and industrial power rail protection where reliability and qualification rigor are mandatory.
Availability
SMAJ7.0C is available at Aetrix Electronics and suitable for switching mode power supplies, automotive lighting modules, and on-board DC/DC converters requiring stable component supply across extended temperature ranges and high-volume production cycles.
Supply support for SMAJ7.0C 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 is engineered specifically for high-reliability transient suppression in automotive and industrial power systems, emphasizing ISO 7637-2 compliance, MSL Level 1 robustness, and stable clamping performance across -55°C to +150°C.
FAQ
What is the polarity configuration of the SMAJ7.0C?
The SMAJ7.0C is a unidirectional TVS diode, with cathode indicated by a band on the DO-214AC package. It conducts only during reverse overvoltage events - i.e., when the cathode is at higher potential than the anode - and remains non-conductive under forward bias. This configuration matches standard DC rail protection topology where the cathode connects to the protected line and the anode to ground. The SMAJ7.0C datasheet confirms unidirectional operation and specifies polarity marking per JEDEC standards.
Does the SMAJ7.0C meet automotive transient immunity standards?
Yes, the SMAJ7.0C meets ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a (sudden load removal), Pulse 2b (battery disconnect), Pulse 3a (capacitive coupled spike), and Pulse 3b (ground noise) requirements. These qualifications are explicitly stated in the Taiwan Semiconductor datasheet Version U2102, confirming suitability for ECU, body control, and lighting module applications. The SMAJ7.0C achieves this through controlled clamping (13.3V @ 200A) and sub-1ps response time.
What is the maximum clamping voltage of the SMAJ7.0C and under what test condition?
The SMAJ7.0C has a maximum clamping voltage (VC) of 13.3 V, measured at 200 A peak pulse current using the standardized 10/1000 μs double-exponential waveform. This value is guaranteed across the full operating temperature range (-55°C to +150°C) and represents the highest voltage seen at the device terminals during worst-case surge events. The SMAJ7.0C datasheet lists this parameter in the Electrical Specifications table under "Maximum clamping voltage VC@IPPM".
Is the SMAJ7.0C RoHS and halogen-free compliant?
Yes, the SMAJ7.0C is RoHS compliant and halogen-free in accordance with IEC 61249-2-21. The device uses lead-free matte tin plating on terminals and halogen-free molding compound meeting UL 94V-0 flammability rating. These compliance statements appear in the Features section of the official Taiwan Semiconductor datasheet (Version U2102), and the device carries appropriate markings for environmental conformity in shipped reels.
How does the SMAJ7.0C differ from the SMAJ7.0A variant?
The SMAJ7.0C has a wider breakdown voltage range (7.78–9.51 V) compared to the SMAJ7.0A (7.78–8.60 V), reflecting looser VBR tolerance. Both share identical VWM (7.0 V), VC (13.3 V vs. 12.0 V), and peak power rating (400 W). The SMAJ7.0C's broader VBR allows greater process yield in high-volume manufacturing, while the SMAJ7.0A targets applications needing tighter clamping predictability. The SMAJ7.0C datasheet explicitly lists both variants in the same Electrical Specifications table with distinct marking codes (AL vs. AM).
SMAJ7.0C 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:
- 13.3V
- Current - Peak Pulse (10/1000µs):
- 30.1A
- 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)
SMAJ7.0C FAQ
1.How can I place an order for SMAJ7.0C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.0C 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 SMAJ7.0C reliable?
The price and inventory of SMAJ7.0C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.0C is usually 5 days.
3.What payment methods are accepted for SMAJ7.0C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.0C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.0C?
SMAJ7.0C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.0C 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 SMAJ7.0C?
For technical support, including SMAJ7.0C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.0C requirements.
6.How does Aetrix verify that SMAJ7.0C is sourced from the original manufacturer or authorized distributors?
All SMAJ7.0C 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 SMAJ7.0C meets industry standards.
7.What is the process for return or replacement of SMAJ7.0C?
All SMAJ7.0C units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.0C, 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 SMAJ7.0C part is unused and in its original packaging.
Return procedure for SMAJ7.0C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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