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Taiwan Semiconductor Corporation SMAJ64H
- Part No.:
- SMAJ64H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ64H.pdf
- Description:
- TVS DIODE 64VWM 114VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,707
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Product details
Overview
SMAJ64H from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 64 V working stand-off voltage (VWM), 71.1–86.9 V breakdown voltage (VBR), 114 V maximum clamping voltage (VC) at 3.5 A peak impulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - suitable for automotive-grade power supply surge suppression per ISO 7637-2.
For engineers reviewing the SMAJ64H datasheet, SMAJ64H pinout, SMAJ64H application, or SMAJ64H equivalent, key selection criteria include clamping performance under 10/1000 µs transients, AEC-Q101 qualification status, DO-214AC (SMA) package compatibility with automated SMT assembly, and leakage current ≤1 µA at 64 V.
Technical Context
The SMAJ64H operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its specified breakdown range (71.1–86.9 V at 1 mA test current). Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1 µA at VWM = 64 V), while fast response time (<1.0 ps) enables effective suppression of ESD and load-dump transients.
It is rated for 400 W peak pulse power (10/1000 µs), derated linearly above 25 °C ambient, with maximum junction temperature of 150 °C and storage range from –55 °C to +150 °C. The device meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b immunity requirements for automotive electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 64 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 71.1 V / 86.9 V at 1 mA - Confirmed avalanche onset range for reliable turn-on margin |
| VC @ IPPM | 114 V at 3.5 A - Clamped voltage during 10/1000 µs surge, limiting downstream stress |
| PPPM | 400 W (10/1000 µs) - Peak transient energy absorption capability |
| IR @ VWM | <1 µA - Negligible standby leakage, preserving system efficiency |
| TJ max | +150 °C - Enables operation in under-hood automotive environments |
| Package | DO-214AC (SMA) - Standardized SMT footprint compatible with IPC-7351B land patterns |
Pinout & Package
DO-214AC (SMA) package: surface-mount, single-diode configuration with cathode band marking. Matte tin-plated leads meet J-STD-002 solderability; moisture sensitivity level 1 (J-STD-020).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to protected circuit ground or lower-potential rail in unidirectional clamp configuration |
| Cathode | Reverse-biased clamping terminal | Connected to line being protected (e.g., 64 V DC input); conducts during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and infotainment power rails |
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity stress |
| Clamping voltage ≤114 V | Provides defined overvoltage ceiling for 64 V systems, protecting downstream MOSFETs and controllers |
| Fast response <1.0 ps | Responds before most ESD or switching transients fully develop, minimizing voltage overshoot |
| ISO 7637-2 compliance | Meets automotive standard for load dump (Pulse 5a/b not applicable), Pulse 1 (inductive switch-off), and Pulse 2a/2b/3a/3b |
Applications
| On-board DC/DC Converter | Automotive Lighting Module |
|---|---|
Use Scenario: Protecting 64 V input stage of buck converter powering LED drivers in commercial vehicle lighting. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input capacitor and converter IC to clamp load-dump spikes. Use Value: Limits transient voltage to ≤114 V, preventing damage to 100 V-rated input MOSFETs and maintaining regulation stability. | Use Scenario: Surge suppression on 64 V CAN-powered headlamp control board exposed to battery transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power rail upstream of microcontroller and driver ICs. Use Value: Withstands ISO 7637-2 Pulse 1 (–200 V, 50 Ω, 2 Ω series) without degradation, ensuring functional safety compliance. |
| Industrial SMPS Input Stage | Railway Signaling Power Supply |
Use Scenario: Input protection for 64 V industrial switch-mode power supply subjected to lightning-induced surges. IC Role / Device Role / Timing Role: First-line transient suppressor across bulk capacitor terminals. Use Value: Absorbs 400 W peak pulses (10/1000 µs), reducing need for secondary MOV or gas discharge tube staging. | Use Scenario: Overvoltage guard on 64 V auxiliary power rail in EN 50121-compliant signaling equipment. IC Role / Device Role / Timing Role: Standoff-rated TVS on DC input feeding isolated DC/DC converters for logic and sensor interfaces. Use Value: Maintains <1 µA leakage at 64 V, avoiding false tripping in low-power monitoring circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ64AH | Narrower VBR range (71.1–78.6 V), tighter 10% tolerance vs. SMAJ64H's ~10–12% spread | Better suited for precision-clamp designs where lower VC variance is critical | Select SMAJ64AH if VBR consistency across production lots is prioritized over absolute cost |
| SMBJ64A | Same VWM/VBR specs but SMB package (DO-214AA); 600 W rating (10/1000 µs) | Higher power handling, larger footprint; requires PCB layout change | Choose SMBJ64A only when >400 W surge margin is required and space permits larger package |
Compared with SMAJ64AH and SMBJ64A, the SMAJ64H offers optimal balance of AEC-Q101 qualification, DO-214AC footprint compatibility, and 400 W surge capability for space-constrained 64 V automotive and industrial power rails - without requiring PCB redesign or sacrificing qualification status.
Availability
SMAJ64H is available at Aetrix Electronics and suitable for automotive power modules, industrial SMPS inputs, and railway signaling power supplies requiring stable component supply, AEC-Q101 compliance, and DO-214AC packaging.
Supply support for SMAJ64H 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 automotive-qualified components.
The SMAJ series was developed specifically for AEC-Q101-compliant transient suppression in 12 V–188 V automotive and industrial DC systems, emphasizing robustness, tight parametric control, and SMT manufacturability.
FAQ
What is the clamping voltage of SMAJ64H under a 10/1000 µs surge?
The SMAJ64H has a maximum clamping voltage (VC) of 114 V at 3.5 A peak impulse current (IPPM), measured 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 transient events. The SMAJ64H maintains this clamping performance while delivering 400 W peak pulse power dissipation.
Is SMAJ64H AEC-Q101 qualified?
Yes, the SMAJ64H is explicitly qualified to AEC-Q101 Rev D for stress testing including HTGB, HTRB, TST, and mechanical shock. This qualification confirms its suitability for automotive applications such as body control modules, lighting systems, and power distribution units where reliability under thermal, vibration, and electrical stress is mandatory. The SMAJ64H datasheet (Version A2102) lists AEC-Q101 as a core feature.
What is the package type and mounting compatibility of SMAJ64H?
The SMAJ64H uses the DO-214AC (SMA) surface-mount package with matte tin-plated leads compliant with J-STD-002 solderability requirements. Its dimensions and pad layout conform to IPC-7351B standards, enabling seamless integration into automated pick-and-place assembly lines. The cathode band marking provides unambiguous polarity identification during placement and inspection.
How does SMAJ64H differ from SMAJ64AH?
The SMAJ64AH features a tighter breakdown voltage range (71.1–78.6 V) versus SMAJ64H (71.1–86.9 V), reflecting improved VBR tolerance control. Both share identical VWM (64 V), IR (<1 µA), and clamping voltage (114 V), but SMAJ64AH's narrower VBR improves consistency in high-volume production where precise clamping onset is critical. The SMAJ64H remains preferred for cost-sensitive applications where nominal performance suffices.
Does SMAJ64H meet ISO 7637-2 immunity requirements?
Yes, the SMAJ64H is specified to meet ISO 7637-2 Pulse 1 (inductive switch-off), Pulse 2a (battery disconnect), Pulse 2b (alternator load dump initiation), Pulse 3a (capacitive coupling), and Pulse 3b (inductive coupling) test waveforms. Its 400 W peak pulse rating and sub-1 µA leakage at 64 V ensure robust suppression of these standardized automotive transients without degradation or parameter shift.
SMAJ64H 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:
- 1
- Bidirectional Channels:
- -
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ64H FAQ
1.How can I place an order for SMAJ64H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ64H 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 SMAJ64H reliable?
The price and inventory of SMAJ64H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ64H is usually 5 days.
3.What payment methods are accepted for SMAJ64H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ64H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ64H?
SMAJ64H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ64H 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 SMAJ64H?
For technical support, including SMAJ64H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ64H requirements.
6.How does Aetrix verify that SMAJ64H is sourced from the original manufacturer or authorized distributors?
All SMAJ64H 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 SMAJ64H meets industry standards.
7.What is the process for return or replacement of SMAJ64H?
All SMAJ64H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ64H, 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 SMAJ64H part is unused and in its original packaging.
Return procedure for SMAJ64H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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