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Taiwan Semiconductor Corporation SMAJ64CAH
- Part No.:
- SMAJ64CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ64CAH.pdf
- Description:
- TVS DIODE 64VWM 103VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,086
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Product details
Overview
SMAJ64CAH from Taiwan Semiconductor is a bidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for automotive-grade surge protection with AEC-Q101 qualification, 64V working stand-off voltage (VWM), 71.1–78.6V breakdown voltage (VBR), and 103V maximum clamping voltage (VC) at 3.9A peak impulse current. It protects DC/DC converters and SMPS against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMAJ64CAH datasheet, SMAJ64CAH pinout, SMAJ64CAH application, or SMAJ64CAH equivalent, key selection criteria include bidirectional clamping capability, 150°C junction temperature rating, sub-1ps response time, low leakage (<1µA @ 64V), and compliance with automotive EMC standards.
Technical Context
The SMAJ64CAH implements a glass-passivated silicon junction optimized for fast transient suppression in bidirectional signal/power lines. Its clamping behavior is defined by a 10/1000μs waveform, delivering 400W peak pulse power up to 78V and derating linearly above 25°C ambient per Fig.2.
It operates across –55°C to +150°C junction temperature range, meets JESD201 Class 2 whisker resistance, and features matte tin-plated leads solderable per J-STD-002. Polarity is marked via cathode band - absent in bidirectional variants like SMAJ64CAH, confirmed by "CAH" suffix indicating bipolar configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 64 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 71.1 V / 78.6 V @ 1 mA - ensures reliable breakdown onset within tight tolerance for predictable protection threshold |
| VC @ IPPM | 103 V @ 3.9 A - clamping voltage during 10/1000μs surge, limiting downstream voltage stress |
| PPPM | 400 W (10/1000μs) - peak surge energy handling capacity compatible with ISO 7637-2 Pulse 3b |
| IR @ VWM | <1 µA - negligible leakage at rated stand-off, preserving system efficiency in standby |
| TJ max | +150 °C - enables deployment in under-hood automotive environments without thermal derating penalties |
| Response time | <1.0 ps - near-instantaneous junction response prevents transient propagation to sensitive circuitry |
Pinout & Package
DO-214AC (SMA) surface-mount package: 2-terminal, bidirectional device with no polarity marking; terminals are symmetrical anode/cathode junctions sharing common case. Dimensions per JEDEC DO-214AC standard: 4.57 mm × 2.92 mm × 2.29 mm (L × W × H), 0.060 g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction | Enables clamping of positive and negative transients without orientation dependency on PCB |
| Case | Non-electrical mechanical body | UL 94V-0 rated molding compound provides flame resistance and mechanical robustness |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS power rails |
| Glass passivated junction | Enhances long-term reliability and stability of VBR under thermal cycling and humidity stress |
| ISO 7637-2 compliance | Guarantees immunity to standardized vehicle electrical disturbances (Pulse 1, 2a, 2b, 3a, 3b) |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; supports standard SMT assembly without moisture-related popcorning |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive for environmentally compliant manufacturing |
Applications
| Automotive Infotainment Power Rail | Industrial PLC I/O Module |
|---|---|
Use Scenario: Protecting 12V supply input of head-unit MCU and display driver ICs from load-dump and jump-start surges. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed upstream of DC/DC converter input. Use Value: Limits transient voltage to ≤103V, preventing latch-up or gate oxide damage in 40V-rated buck controllers. | Use Scenario: Safeguarding 24V digital input channels against field-wiring induced EFT and inductive kickback. IC Role / Device Role / Timing Role: Primary overvoltage clamp at terminal block interface before optocoupler or Schmitt trigger input stage. Use Value: Sub-1ps response ensures clamping occurs before EFT burst (5ns rise time) propagates into logic circuitry. |
| On-board DC/DC Converter Input | LED Driver Supply Protection |
Use Scenario: Input-side surge suppression for 48V-to-5V isolated flyback converter in telecom base station equipment. IC Role / Device Role / Timing Role: First-line transient absorber between connector and primary-side MOSFET gate driver. Use Value: 400W peak power rating sustains multiple ISO 7637-2 Pulse 3b events without degradation. | Use Scenario: Overvoltage protection for constant-current LED driver ICs powered from 36V industrial bus. IC Role / Device Role / Timing Role: Parallel-connected TVS across input capacitor to clamp switching noise and lightning-induced spikes. Use Value: 64V VWM allows margin above nominal 36V rail while 103V VC stays below 120V absolute max rating of driver ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ64AHE3/5BT | Same VWM (64V), identical VBR (71.1–78.6V), but packaged by Vishay with different tape/reel specification (5,000 pcs vs. 7,500) | No functional difference; validated for same ISO 7637-2 pulses and AEC-Q101 stress profiles | Select when requiring Vishay's traceability or alternate logistics packaging |
| P6SMB64CA | Same DO-214AA (SMB) footprint but higher 600W PPPM rating; VBR tighter (71.1–75.9V); VC = 103V @ 5.9A | Higher surge capacity suits high-energy transients; SMB package requires larger PCB area than SMA | Choose for enhanced energy handling where board space permits and 600W rating is required |
Compared with SMAJ64CAH, SMAJ64AHE3/5BT offers identical electrical performance with alternate logistics, while P6SMB64CA delivers higher surge robustness in a larger SMB package - enabling trade-offs between board density and transient margin.
Availability
SMAJ64CAH is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and on-board DC/DC converter inputs requiring stable component supply with AEC-Q101 assurance and ISO 7637-2 compliance.
Supply support for SMAJ64CAH 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 devices since 1979.
The SMAJ series was developed specifically for automotive and industrial transient suppression, emphasizing AEC-Q101 reliability, fast response, and standardized DO-214AC packaging for automated SMT assembly.
FAQ
What does the "CAH" suffix indicate in SMAJ64CAH?
The "CAH" suffix in SMAJ64CAH denotes a bidirectional configuration with AEC-Q101 qualification and halogen-free construction. Unlike unidirectional "H" or "AH" variants, CAH has symmetrical anode-cathode junctions enabling clamping of both positive and negative transients without polarity sensitivity - critical for AC-coupled or floating bus protection.
Is SMAJ64CAH compatible with lead-free reflow soldering processes?
Yes, SMAJ64CAH is fully compatible with lead-free reflow soldering. Its matte tin-plated leads meet J-STD-002 solderability requirements, and the DO-214AC package withstands JEDEC J-STD-020 Level 1 moisture sensitivity conditions - eliminating pre-bake requirements and supporting standard Pb-free thermal profiles up to 260°C peak.
How does SMAJ64CAH perform under repeated surge events?
SMAJ64CAH is rated for non-repetitive 10/1000μs surges per Fig.5. While not specified for repetitive operation, its 150°C TJ max and glass-passivated junction enable robust performance across multiple transient events when thermally managed - verified in AEC-Q101 stress testing including temperature cycling and high-temperature operating life.
Does SMAJ64CAH require external heat sinking in typical applications?
No, SMAJ64CAH does not require external heat sinking in standard applications. With only 1W steady-state power dissipation (PD) and low leakage (<1µA), self-heating is negligible. Thermal design relies on PCB copper pour per DO-214AC recommended pad layout - sufficient for transient absorption without sustained thermal buildup.
Can SMAJ64CAH be used in place of SMAJ64AH in a new design?
No - SMAJ64CAH and SMAJ64AH are functionally distinct. SMAJ64AH is unidirectional (cathode-marked), while SMAJ64CAH is bidirectional (no polarity mark). Substituting SMAJ64CAH for SMAJ64AH may cause improper clamping on AC or floating nodes; always verify circuit topology and transient polarity before interchange.
SMAJ64CAH 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ64CAH FAQ
1.How can I place an order for SMAJ64CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ64CAH 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 SMAJ64CAH reliable?
The price and inventory of SMAJ64CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ64CAH is usually 5 days.
3.What payment methods are accepted for SMAJ64CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ64CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ64CAH?
SMAJ64CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ64CAH 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 SMAJ64CAH?
For technical support, including SMAJ64CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ64CAH requirements.
6.How does Aetrix verify that SMAJ64CAH is sourced from the original manufacturer or authorized distributors?
All SMAJ64CAH 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 SMAJ64CAH meets industry standards.
7.What is the process for return or replacement of SMAJ64CAH?
All SMAJ64CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ64CAH, 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 SMAJ64CAH part is unused and in its original packaging.
Return procedure for SMAJ64CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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