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Taiwan Semiconductor Corporation SMAJ64CA
- Part No.:
- SMAJ64CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ64CA.pdf
- Description:
- TVS DIODE 64VWM 103VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,734
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Product details
Overview
SMAJ64CA from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping fast ESD and surge transients in DC power lines. It features a 64 V working stand-off voltage (VWM), 71.1–86.9 V breakdown voltage (VBR @ 1 mA), 114 V maximum clamping voltage (VC @ 3.5 A), and 400 W peak pulse power (10/1000 µs). It is used in automotive power rails and industrial DC/DC converters to protect downstream ICs from ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMAJ64CA datasheet, SMAJ64CA pinout, SMAJ64CA application, or SMAJ64CA equivalent, key selection criteria include bidirectional clamping capability, 114 V clamping at 3.5 A, DO-214AC mechanical compatibility, moisture sensitivity level 1 compliance, and RoHS/halogen-free status for high-reliability board assembly.
Technical Context
The SMAJ64CA operates as a silicon avalanche diode with glass-passivated junction, enabling sub-nanosecond response (<1.0 ps from 0 V to VBR min) and low leakage (<1 µA at 64 V). Its bidirectional configuration supports symmetrical transient suppression on AC-coupled or floating DC lines without polarity dependency.
It delivers 400 W peak pulse power under 10/1000 µs waveform up to TA = 25°C, derating linearly above that temperature per Fig.2. Junction temperature range is –55 °C to +150 °C, and it meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 64 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC bias margin. |
| VBR @ IT = 1 mA | 71.1–86.9 V - Breakdown threshold range; ensures reliable turn-on during overvoltage events. |
| VC @ IPPM = 3.5 A | 114 V - Maximum clamped voltage during 10/1000 µs surge; determines protected circuit's voltage stress limit. |
| PPPM | 400 W - Peak pulse power handling (10/1000 µs); enables robust protection against ISO 7637-2 Pulse 1/2a/2b/3a/3b. |
| IR @ VWM | <1 µA - Reverse leakage at rated stand-off voltage; minimizes standby power loss in battery-powered systems. |
| TJ Range | –55 °C to +150 °C - Operating junction temperature range; supports under-hood automotive and industrial ambient conditions. |
| Package | DO-214AC (SMA) - Standard surface-mount outline with 0.060 g mass; compatible with automated pick-and-place and reflow. |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case with matte tin-plated leads, cathode band marking polarity for unidirectional variants; SMAJ64CA is bidirectional and marked with "RL" code - no cathode band required. Leads are solderable per J-STD-002; meets JESD201 Class 2 whisker test and UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction terminals | No polarity dependence - either terminal serves as anode or cathode depending on transient polarity; enables placement without orientation check. |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1.0 ps - Enables clamping before sensitive logic or analog circuits experience damaging overvoltage. |
| ISO 7637-2 compliance | Pulse 1/2a/2b/3a/3b - Validated for automotive load-dump and inductive-switching transient immunity per international standard. |
| Moisture sensitivity | Level 1 (J-STD-020) - No dry-pack or baking required prior to reflow; simplifies SMT line logistics. |
| Environmental compliance | RoHS-compliant and halogen-free (IEC 61249-2-21) - Meets global regulatory requirements for green electronics manufacturing. |
Applications
| Automotive Power Rail Protection | Industrial DC/DC Converter Input |
|---|---|
Use Scenario: 12 V/24 V vehicle battery line exposed to load dump (Pulse 5a) and alternator switching transients (Pulse 2a). IC Role / Device Role / Timing Role: Bidirectional TVS clamp limiting rail voltage to ≤114 V during 400 W surges, protecting MCU, CAN transceivers, and PMICs. Use Value: Prevents latch-up or gate oxide damage in downstream semiconductors by maintaining voltage below absolute maximum ratings during ISO 7637-2 events. |
Use Scenario: 48 V input stage of isolated DC/DC converter in factory automation equipment subject to inductive kickback and EFT bursts. IC Role / Device Role / Timing Role: Primary surge shunt on primary-side bus, absorbing energy before it reaches transformer or controller IC. Use Value: Eliminates need for external snubbers or oversized input capacitors by clamping transients within 1 ps and sustaining 400 W peak power. |
| LED Driver Power Input | Telecom Power Interface |
Use Scenario: Constant-current LED driver board powered from 24 V PoE-derived supply, exposed to cable discharge events and hot-swap surges. IC Role / Device Role / Timing Role: Front-end transient suppressor placed directly at connector, ahead of input filter and controller. Use Value: Maintains stable 64 V stand-off while clamping to 114 V, preventing false shutdown or overvoltage lockout in driver ICs during field-deployed operation. |
Use Scenario: 48 V DC feed interface in remote radio unit (RRU), subjected to lightning-induced surges on outdoor cabling per IEC 61000-4-5. IC Role / Device Role / Timing Role: First-line bidirectional protection device on power entry, coordinated with secondary GDT or MOV stages. Use Value: Provides precise 114 V clamping ceiling with <1 µA leakage, preserving efficiency and enabling accurate upstream current monitoring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ64A | Unidirectional; same VWM/VBR/VC specs but requires correct polarity orientation during placement. | Only suitable where circuit ground reference is fixed and transient polarity is known (e.g., single-rail SMPS output). | Select SMAJ64A only if system topology guarantees unidirectional surge direction and layout allows polarity-aware placement. |
| SMBJ64CA | Same electrical specs but in larger DO-214AA (SMB) package; 600 W PPPM rating (vs. 400 W for SMAJ64CA). | Better thermal dissipation and higher surge margin; requires larger PCB footprint and different pad layout. | Choose SMBJ64CA when surge duty cycle or energy levels exceed SMAJ64CA's 400 W limit, or when board space permits larger package. |
Compared with SMAJ64A and SMBJ64CA, the SMAJ64CA offers optimal balance of bidirectional flexibility, DO-214AC footprint efficiency, and certified 400 W ISO 7637-2 compliance - making it preferred for compact, polarity-agnostic protection in automotive and industrial DC rails.
Availability
SMAJ64CA is available at Aetrix Electronics and suitable for automotive power rail protection, industrial DC/DC converter input stages, and LED driver power inputs requiring stable component supply across extended temperature and surge environments.
Supply support for SMAJ64CA 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, rectifiers, and MOSFETs for industrial and automotive markets.
The SMAJ series was developed specifically for high-reliability, surface-mount transient suppression in harsh environments - emphasizing fast response, AEC-Q200 readiness, and compliance with ISO 7637-2 and IEC 61000-4-5 standards.
FAQ
What does the "CA" suffix indicate in SMAJ64CA?
The "CA" suffix in SMAJ64CA denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression in both forward and reverse directions. Unlike unidirectional variants (e.g., SMAJ64A), SMAJ64CA has no polarity marking and can be placed without orientation concern, making it ideal for floating or AC-coupled lines where surge polarity is unpredictable.
What is the maximum clamping voltage of SMAJ64CA and under what test condition?
The maximum clamping voltage of SMAJ64CA is 114 V, measured at a peak pulse current (IPPM) of 3.5 A using the standardized 10/1000 µs double-exponential waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during surge events.
Does SMAJ64CA meet automotive transient immunity standards?
Yes, SMAJ64CA meets ISO 7637-2 requirements for Pulses 1, 2a, 2b, 3a, and 3b - covering common automotive transients such as load dump, alternator switching, and inductive load release. Its 400 W peak pulse power rating and sub-nanosecond response ensure effective suppression without degradation under repeated stress.
Is SMAJ64CA RoHS and halogen-free compliant?
Yes, SMAJ64CA is fully RoHS compliant and halogen-free per IEC 61249-2-21. The molding compound and lead finish meet environmental regulations for lead-free soldering processes, and the device carries no exemptions - supporting green manufacturing and end-of-life recycling requirements.
What is the moisture sensitivity level (MSL) of SMAJ64CA and how does it affect handling?
SMAJ64CA has a moisture sensitivity level (MSL) of Level 1 per J-STD-020, meaning it is not humidity-sensitive and may be stored indefinitely at ambient conditions without dry packing or baking. This eliminates reflow-related popcorning risk and simplifies SMT line integration for high-volume production.
SMAJ64CA 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:
- 103V
- Current - Peak Pulse (10/1000µs):
- 3.9A
- 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)
SMAJ64CA FAQ
1.How can I place an order for SMAJ64CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ64CA 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 SMAJ64CA reliable?
The price and inventory of SMAJ64CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ64CA is usually 5 days.
3.What payment methods are accepted for SMAJ64CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ64CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ64CA?
SMAJ64CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ64CA 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 SMAJ64CA?
For technical support, including SMAJ64CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ64CA requirements.
6.How does Aetrix verify that SMAJ64CA is sourced from the original manufacturer or authorized distributors?
All SMAJ64CA 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 SMAJ64CA meets industry standards.
7.What is the process for return or replacement of SMAJ64CA?
All SMAJ64CA units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ64CA, 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 SMAJ64CA part is unused and in its original packaging.
Return procedure for SMAJ64CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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