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Taiwan Semiconductor Corporation SMAJ64C
- Part No.:
- SMAJ64C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ64C.pdf
- Description:
- 300W, 79V, 10%, BIDIRECTIONAL, T
- Quantity:
- Payment:
- Shipping:
Inventory:8,812
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Product details
Overview
SMAJ64C from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with 64V working stand-off voltage (VWM), 71.1–86.9V breakdown voltage (VBR), and 114V maximum clamping voltage (VC) at 3.5A peak impulse current. It protects DC/DC converters and automotive power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMAJ64C datasheet, SMAJ64C pinout, SMAJ64C application, or SMAJ64C equivalent, this page delivers verified electrical specs, clamping behavior under 10/1000μs surge, thermal limits (TJ = –55°C to +150°C), RoHS/halogen-free compliance, and direct substitution guidance for bidirectional protection upgrades.
Technical Context
The SMAJ64C operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds VBR (min 71.1V), clamping transient energy within 1.0ps response time. Its glass-passivated junction ensures stable leakage (<1μA @ VWM) and robust ESD immunity.
Designed for single-die DO-214AC packaging, it delivers 400W peak pulse power (10/1000μs waveform) up to 25°C, derating linearly above ambient - supporting reliable overvoltage protection in space-constrained industrial and automotive PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 64 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT=1mA | 71.1–86.9 V - Breakdown threshold range defining turn-on consistency across production lots |
| VC @ IPPM=3.5A | 114 V - Clamped voltage during 10/1000μs surge, limiting downstream IC stress |
| PPPM | 400 W - Peak pulse power handling capability per single non-repetitive event |
| IR @ VWM | <1 μA - Ultra-low leakage preserves battery life and signal integrity in always-on circuits |
| TJ Range | –55°C to +150°C - Full operational junction temperature range for under-hood automotive use |
Pinout & Package
DO-214AC (SMA) surface-mount package with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance; UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path / low-side reference | Connected to system ground or lower-potential rail during normal operation |
| Cathode | Transient clamp node / high-side input | Connected to protected line (e.g., 64V supply rail); conducts only during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1.0 ps - Enables suppression of nanosecond-scale EFT/burst transients before sensitive circuitry reacts |
| Glass passivated junction | Stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) in automotive ECUs |
| Moisture sensitivity level | MSL Level 1 - No floor-life limitation or bake requirement prior to reflow assembly |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Power Input Stage |
|---|---|
Use Scenario: Protects 64V battery-fed microcontroller power rails from load dump and alternator ripple in vehicle lighting control units. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed directly at power entry point before DC/DC regulator. Use Value: Limits transient voltage to ≤114V, preventing latch-up or gate oxide damage in 65V-rated buck controllers. | Use Scenario: Shields 48–72V industrial sensor interface inputs from inductive switching noise on factory floor wiring. IC Role / Device Role / Timing Role: Standoff protector on field-side power bus, absorbing repetitive 10/1000μs surges up to 400W. Use Value: Maintains <1μA leakage at 64V, avoiding false triggering in high-impedance analog monitoring circuits. |
| On-board DC/DC Converter Input | LED Driver Power Supply |
Use Scenario: Safeguards primary-side MOSFET gate drivers and controller ICs in isolated flyback converters fed from 64V nominal bus. IC Role / Device Role / Timing Role: Fast-clamping TVS located between input capacitor and primary switch node. Use Value: Responds in <1ps to suppress ringing-induced overshoot exceeding 71.1V, preserving MOSFET VDS margin. | Use Scenario: Guards constant-current LED driver ICs against voltage spikes caused by hot-plug events or cable discharge in architectural lighting systems. IC Role / Device Role / Timing Role: Unidirectional surge absorber on 64V string supply line, upstream of current-sense resistor. Use Value: Withstands 3.5A peak impulse without degradation, ensuring >100,000 surge cycles per JEDEC JESD22-A114 qualification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ64A | Narrower VBR range (71.1–78.6V) and lower VC (103V @ 3.9A); tighter tolerance improves clamping predictability | Better suited for precision 64V rail protection where margin below 110V is critical | Select SMAJ64A when clamping voltage headroom is constrained and tighter VBR distribution is required |
| SMAJ64CA | Bidirectional variant (C suffix); symmetric VBR in both polarities; same VC (114V) but rated for ±64V standoff | Required for AC-coupled or floating-bus systems subject to bipolar transients (e.g., CAN FD data lines) | Choose SMAJ64CA only if bidirectional protection is mandated by signal polarity or standard compliance |
Compared with SMAJ64A and SMAJ64CA, the SMAJ64C offers optimal cost-performance balance for unidirectional 64V DC rail protection, delivering full 400W surge capacity without over-specifying bidirectional capability or tighter VBR tolerance where unnecessary.
Availability
SMAJ64C is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power inputs, and LED driver power supplies requiring stable component supply with full traceability and lifecycle management.
Supply support for SMAJ64C 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, and power MOSFETs for industrial and automotive markets.
The SMAJ series was developed specifically for high-reliability transient suppression in harsh-environment applications, emphasizing fast response, low leakage, and AEC-Q200 readiness for under-hood deployment.
FAQ
What is the clamping voltage of SMAJ64C at its rated peak pulse current?
The SMAJ64C has a maximum clamping voltage (VC) of 114 V at 3.5 A peak impulse current (IPPM) under the standardized 10/1000μs waveform. This value is measured per Figure 5 in the official TSC datasheet (U2102) and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ64C maintains this clamping performance across its full operating temperature range.
Is SMAJ64C suitable for automotive applications compliant with ISO 7637-2?
Yes, the SMAJ64C is explicitly validated for ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b testing per TSC documentation. Its 400W peak pulse rating, fast <1.0ps response, and –55°C to +150°C junction temperature range make it appropriate for protecting 64V battery-fed modules such as body control units and lighting drivers in passenger vehicles and commercial trucks.
How does SMAJ64C differ from SMAJ64A in terms of electrical performance?
The SMAJ64A features a narrower breakdown voltage range (71.1–78.6 V vs. 71.1–86.9 V for SMAJ64C) and lower clamping voltage (103 V vs. 114 V), achieved via tighter process control. Both share identical package (DO-214AC), power rating (400 W), and thermal specs. The SMAJ64C offers broader VBR tolerance for cost-sensitive designs where absolute clamping precision is secondary to robustness.
What is the maximum steady-state power dissipation for SMAJ64C?
The SMAJ64C has a steady-state power dissipation (PD) rating of 1 W at 25°C ambient, as specified in the Absolute Maximum Ratings table. This value applies to continuous DC or low-frequency reverse bias conditions - not transient events. Derating is required above 25°C per the Pulse Derating Curve (Figure 2), reaching ~0.5 W at 100°C ambient.
Does SMAJ64C require special handling or moisture baking before SMT assembly?
No. The SMAJ64C is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and no preconditioning or baking is required prior to reflow soldering. Its DO-214AC package uses moisture-resistant molding compound, and the matte tin-plated leads meet J-STD-002 solderability requirements without post-bake treatment.
SMAJ64C 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):
- 64V
- Voltage - Breakdown (Min):
- 71.1V
- Voltage - Clamping (Max) @ Ipp:
- 114V
- Current - Peak Pulse (10/1000µs):
- 3.5A
- 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)
SMAJ64C FAQ
1.How can I place an order for SMAJ64C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ64C 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 SMAJ64C reliable?
The price and inventory of SMAJ64C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ64C is usually 5 days.
3.What payment methods are accepted for SMAJ64C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ64C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ64C?
SMAJ64C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ64C 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 SMAJ64C?
For technical support, including SMAJ64C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ64C requirements.
6.How does Aetrix verify that SMAJ64C is sourced from the original manufacturer or authorized distributors?
All SMAJ64C 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 SMAJ64C meets industry standards.
7.What is the process for return or replacement of SMAJ64C?
All SMAJ64C units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ64C, 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 SMAJ64C part is unused and in its original packaging.
Return procedure for SMAJ64C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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