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Taiwan Semiconductor Corporation SMAJ36
- Part No.:
- SMAJ36
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ36.pdf
- Description:
- 400W, 44.5V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:2,482
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Product details
Overview
SMAJ36 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for overvoltage protection in DC power lines and signal paths. It features a 36 V working stand-off voltage (VWM), 40.0–48.9 V breakdown voltage (VBR) at 1 mA, 64.3 V maximum clamping voltage (VC) at 6.2 A peak pulse current, and 400 W peak pulse power rating with a 10/1000 µs waveform - suitable for automotive load-dump and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance.
For engineers reviewing the SMAJ36 datasheet, SMAJ36 pinout, SMAJ36 application, or SMAJ36 equivalent, this device is selected for robust ESD and surge immunity in on-board DC/DC converters, industrial SMPS inputs, lighting drivers, and adapter-level input protection where fast response (<1 ps), low leakage (<1 µA at 36 V), and DO-214AC package compatibility are critical.
Technical Context
The SMAJ36 operates as a single-die, unidirectional avalanche diode with glass-passivated junction and cathode-band polarity marking. Its clamping behavior is defined by a 10/1000 µs standard surge waveform, delivering 64.3 V clamping at 6.2 A while maintaining <1 µA reverse leakage at rated VWM of 36 V.
Thermal performance is specified for -55 °C to +150 °C operating junction temperature, with steady-state power dissipation of 1 W and peak forward surge current rating of 40 A (8.3 ms half-sine). It meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements in its DO-214AC (SMA) package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 36 V - Maximum continuous reverse voltage before significant leakage; sets upper limit for protected circuit operating voltage |
| VBR min/max | 40.0 / 48.9 V @ 1 mA - Confirmed avalanche onset range; ensures reliable turn-on above system transients |
| VC @ IPPM | 64.3 V @ 6.2 A - Clamped voltage during 10/1000 µs surge; defines worst-case stress on downstream ICs |
| PPPM | 400 W - Peak pulse power handling per 10/1000 µs waveform; supports ISO 7637-2 Pulse 5a load-dump immunity |
| IR @ VWM | <1 µA - Reverse leakage at 36 V; negligible power loss and no measurable impact on high-impedance bias networks |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline; compatible with automated placement and reflow profiles |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, cathode band marking polarity, 0.060 g typical weight, and RoHS/halogen-free compliance. Moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point under forward bias | Connected to lower-potential side (e.g., GND) in unidirectional TVS configuration |
| Cathode | Current exit point under forward bias; marked with band | Connected to protected line (e.g., 36 V rail); conducts avalanche current during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable breakdown voltage and long-term reliability under repeated surge stress without degradation |
| Sub-1 ps response time | Clamps transients before sensitive downstream components experience damaging voltage overshoot |
| ISO 7637-2 compliance | Validated for automotive Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (capacitive coupling) |
| J-STD-020 Level 1 moisture rating | Enables standard SMT assembly without baking; eliminates moisture-related popcorning risk |
Applications
| Automotive On-Board DC/DC Converter Input | Industrial Switching Mode Power Supply (SMPS) Input |
|---|---|
Use Scenario: Protection against load-dump surges and battery reversal transients on 24 V DC/DC converter inputs in vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between input rail and ground to shunt energy before it reaches controller ICs and MOSFETs. Use Value: Limits transient voltage to ≤64.3 V, preserving 75 V-rated input capacitors and enabling use of cost-optimized 60 V input-stage FETs. | Use Scenario: Input-stage surge suppression in 36 V nominal industrial SMPS front-ends exposed to lightning-induced surges and switching noise. IC Role / Device Role / Timing Role: Primary overvoltage clamp parallel to bulk input capacitor, triggered within <1 ps to prevent upstream rectifier or PFC stage overstress. Use Value: Withstands 400 W peak pulses without derating up to 125 °C ambient, supporting convection-cooled designs in enclosed enclosures. |
| LED Driver Power Input Stage | AC/DC Adapter Secondary-Side Output Protection |
Use Scenario: Transient suppression on constant-current LED driver inputs subjected to hot-plug and cable discharge events. IC Role / Device Role / Timing Role: Standoff-rated TVS connected across input terminals to absorb ESD and fast-rising line disturbances. Use Value: 36 V VWM matches common 36 V LED string supplies; <1 µA leakage avoids interference with precision current regulation. | Use Scenario: Output-side protection in universal-input AC/DC adapters to prevent damage from output short-circuit recovery spikes or reverse polarity connection. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to output ground, absorbing positive-going transients on regulated 5–24 V outputs. Use Value: 64.3 V clamping voltage provides margin above 24 V max output, ensuring downstream USB-PD or PoE controllers remain within absolute maximum ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ36A | Lower VBR range (40.0–44.2 V), tighter tolerance, 58.1 V clamping at 6.9 A | Better suited for systems requiring tighter voltage margin control and lower clamping under same surge current | Select SMAJ36A when clamping voltage headroom is constrained and tighter VBR consistency is required |
| SMBJ36 | Same VWM/VBR/VC specs but in larger DO-214AA (SMB) package; 600 W PPPM rating | Higher power handling enables longer surge duration immunity; requires larger PCB footprint | Choose SMBJ36 only if 600 W peak power is needed and board space allows DO-214AA layout |
Compared with SMAJ36A, the SMAJ36 offers higher clamping voltage but broader VBR tolerance - advantageous where system-level surge testing shows margin above 64.3 V. Compared with SMBJ36, SMAJ36 trades 200 W peak power for 30% smaller footprint and identical electrical performance at 400 W, making it optimal for space-constrained 36 V rail protection.
Availability
SMAJ36 is available at Aetrix Electronics and suitable for automotive on-board DC/DC converters, industrial SMPS inputs, and LED driver power stages requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for SMAJ36 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 part of TSC's transient suppression product line, engineered specifically for high-reliability, surface-mount overvoltage protection in automotive, industrial, and consumer power systems with strict ISO 7637-2 and AEC-Q200 alignment.
FAQ
What is the maximum clamping voltage of the SMAJ36 under standard 10/1000 µs surge conditions?
The SMAJ36 has a maximum clamping voltage (VC) of 64.3 V at 6.2 A peak pulse current under the standardized 10/1000 µs waveform. This value is measured per JEDEC standards and represents the highest voltage the SMAJ36 will allow across its terminals during a defined transient event - critical for verifying downstream component voltage margins in designs using the SMAJ36.
Is the SMAJ36 suitable for bidirectional transient protection?
No, the SMAJ36 is a unidirectional TVS diode intended for protection against positive-going transients on DC lines referenced to ground. For bidirectional applications, the SMAJ36CA variant (with "CA" suffix) must be used - it provides symmetrical clamping in both polarities and is explicitly designated for bipolar use per TSC documentation.
What is the reverse leakage current specification for the SMAJ36 at its rated working voltage?
The SMAJ36 exhibits a maximum reverse leakage current (IR) of 1 µA when biased at its working stand-off voltage (VWM) of 36 V. This ultra-low leakage ensures minimal power loss and zero impact on high-impedance sensing circuits or battery-powered systems where quiescent current is tightly controlled - a confirmed parameter from TSC's official electrical specifications table.
Does the SMAJ36 meet automotive surge immunity standards?
Yes, the SMAJ36 meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for automotive electronic modules. Its 400 W peak pulse power rating, sub-1 ps response time, and validated clamping performance under standardized waveforms make it suitable for ECU, body control, and lighting module protection - as explicitly stated in the "FEATURES" section of the TSC datasheet for SMAJ36.
What package type does the SMAJ36 use, and is it compatible with standard SMT assembly processes?
The SMAJ36 uses the DO-214AC (SMA) surface-mount package with matte tin-plated leads, compliant with J-STD-002 solderability requirements. Its moisture sensitivity level is rated J-STD-020 Level 1, meaning it can be processed using standard reflow profiles without pre-baking - fully compatible with high-volume automated placement and lead-free reflow assembly for the SMAJ36.
SMAJ36 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):
- 36V
- Voltage - Breakdown (Min):
- 40V
- Voltage - Clamping (Max) @ Ipp:
- 64.3V
- Current - Peak Pulse (10/1000µs):
- 6.2A
- 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)
SMAJ36 FAQ
1.How can I place an order for SMAJ36 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ36 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 SMAJ36 reliable?
The price and inventory of SMAJ36 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ36 is usually 5 days.
3.What payment methods are accepted for SMAJ36?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ36 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ36?
SMAJ36 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ36 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 SMAJ36?
For technical support, including SMAJ36 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ36 requirements.
6.How does Aetrix verify that SMAJ36 is sourced from the original manufacturer or authorized distributors?
All SMAJ36 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 SMAJ36 meets industry standards.
7.What is the process for return or replacement of SMAJ36?
All SMAJ36 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ36, 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 SMAJ36 part is unused and in its original packaging.
Return procedure for SMAJ36:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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