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Taiwan Semiconductor Corporation SMAJ36CH
- Part No.:
- SMAJ36CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ36CH.pdf
- Description:
- TVS DIODE 36VWM 64.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,413
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Product details
Overview
SMAJ36CH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for robust overvoltage protection in DC power rails. It features a 36 V working stand-off voltage (VWM), 40.0–48.9 V breakdown voltage (VBR) at 1 mA test current, and clamps transients to ≤64.3 V at 6.2 A peak impulse current under 10/1000 µs waveform - ideal for protecting automotive-grade DC/DC converters against ISO 7637-2 Pulse 1/2a/2b/3a/3b surges.
For engineers reviewing the SMAJ36CH datasheet, SMAJ36CH pinout, SMAJ36CH application, or SMAJ36CH equivalent, this device is selected for high-reliability 12–24 V system rail protection where AEC-Q101 qualification, low leakage (<1 µA @ 36 V), and fast sub-1 ps response are critical design requirements.
Technical Context
The SMAJ36CH operates as a unidirectional avalanche diode with glass-passivated junction, optimized for clamping transient energy without latch-up. Its 400 W peak pulse power rating (10/1000 µs) applies up to 78 V; above that, derating reduces capability to 300 W - confirmed by Fig.2 pulse derating curve.
It meets ISO 7637-2 immunity requirements for automotive electronics and supports bidirectional use only when paired with complementary devices (e.g., SMAJ36AH for symmetric clamping). Polarity is marked by cathode band per DO-214AC mechanical drawing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 36 V - maximum continuous reverse operating voltage before significant leakage begins |
| VBR min/max | 40.0–48.9 V @ 1 mA - ensures reliable avalanche initiation across production lot and temperature |
| VC @ IPPM | ≤64.3 V @ 6.2 A - defines worst-case protected circuit voltage during surge event |
| PPPM | 400 W (10/1000 µs) - quantifies single-event surge energy handling capacity |
| IR @ VWM | <1 µA - guarantees minimal standby power loss and signal integrity in always-on systems |
| TJ max | +150 °C - enables operation in under-hood automotive environments |
| Package | DO-214AC (SMA) - industry-standard surface-mount outline compatible with automated placement |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case with matte tin-plated leads, polarity indicated by cathode band on cathode end. Weight ≈0.060 g. Meets UL 94V-0 flammability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path / surge return node | Connected to ground or low-impedance return path to complete clamping loop |
| Cathode | Protected line connection / surge input node | Connected to the line being protected (e.g., +12 V rail); cathode band marks this terminal |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including temperature cycling, humidity bias, and mechanical shock per stress test plan |
| Glass passivated junction | Enhances long-term reliability and stability of breakdown voltage under thermal and humidity stress |
| Clamping voltage ≤64.3 V | Ensures downstream ICs rated for 65 V absolute maximum survive ISO 7637-2 Pulse 2b (50 V, 100 ms) events |
| Fast response time <1.0 ps | Prevents voltage overshoot before protection activates - critical for safeguarding fast-switching MOSFET gates |
| Moisture sensitivity level 1 | Allows unlimited floor life before reflow; no baking required prior to assembly |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 12 V supply rail in BCM against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VIN and GND to clamp transients exceeding 36 V. Use Value: Withstands 400 W surges per ISO 7637-2 Pulse 5a while maintaining <1 µA leakage at nominal 12 V operation. | Use Scenario: Safeguarding 24 V digital input channels from field-wiring induced surges. IC Role / Device Role / Timing Role: Standoff protection element on each isolated input channel, referenced to local ground. Use Value: Clamps to ≤64.3 V within sub-nanosecond, preventing damage to optocoupler input stages and MCU GPIOs. |
| On-board DC/DC Converter Input | LED Driver Power Stage |
Use Scenario: Input-side surge suppression for 24 V-to-5 V buck converter in vehicle infotainment head unit. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of input filter capacitor and controller IC. Use Value: Limits transient voltage to safe levels for controller ICs with 40 V absolute max rating, using verified 6.2 A IPPM capability. | Use Scenario: Protecting constant-current LED driver ICs from back-EMF during hot-swap or cable disconnect events. IC Role / Device Role / Timing Role: Reverse-biased TVS across driver output to absorb inductive kickback. Use Value: Leverages 150 °C TJ max and low IR to maintain stable operation in thermally constrained LED housing environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ36AH | Lower VBR range (40.0–44.2 V vs. 40.0–48.9 V); tighter tolerance; same VWM, VC, and PPPM | Preferred where tighter breakdown consistency is needed for precise clamping threshold control | Select SMAJ36AH when statistical VBR distribution must be minimized across production batches |
| SMBJ36A | Same VWM/VBR/VC specs but in larger DO-214AA (SMB) package; 600 W PPPM rating | Better suited for higher-energy surges or designs requiring margin beyond 400 W | Choose SMBJ36A if board layout allows larger footprint and system-level surge testing exceeds 400 W limits |
Compared with SMAJ36AH and SMBJ36A, the SMAJ36CH offers broader VBR tolerance for cost-sensitive automotive modules, maintains identical AEC-Q101 compliance and DO-214AC compatibility, and delivers optimal balance of surge robustness, leakage, and PCB space in compact 12–24 V rail protection.
Availability
SMAJ36CH is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and LED lighting power supplies requiring stable component supply with full traceability and lifecycle management.
Supply support for SMAJ36CH 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 high-reliability protection devices, rectifiers, and TVS diodes for automotive and industrial markets.
The SMAJ series was developed specifically for AEC-Q101-compliant transient suppression in harsh-environment 12 V and 24 V automotive electrical systems, emphasizing low leakage, stable clamping, and automated assembly compatibility.
FAQ
What is the clamping voltage of SMAJ36CH under standard 10/1000 µs surge conditions?
The SMAJ36CH has a maximum clamping voltage (VC) of 64.3 V at 6.2 A peak impulse current (IPPM) under the standardized 10/1000 µs waveform. This value is measured per JEDEC test conditions and represents the upper limit of voltage seen by downstream circuitry during a defined transient event. The SMAJ36CH maintains this clamping performance across its specified operating junction temperature range of –55 °C to +150 °C.
Is SMAJ36CH suitable for bidirectional transient protection?
No, SMAJ36CH is a unidirectional TVS diode intended for protection of positive-polarity DC lines only. For bidirectional applications, Taiwan Semiconductor specifies the SMAJ36AH variant - which shares the same VWM and clamping characteristics but is designed for symmetrical surge suppression in AC-coupled or floating systems. The SMAJ36CH's cathode band marking confirms its unidirectional polarity and must be oriented correctly in-circuit.
Does SMAJ36CH meet automotive qualification standards?
Yes, SMAJ36CH is explicitly AEC-Q101 qualified per the manufacturer's documentation. It undergoes stress testing including temperature cycling, high-temperature reverse bias, humidity bias, and mechanical shock to ensure reliability in automotive under-hood and cabin environments. Its DO-214AC package also complies with J-STD-020 moisture sensitivity level 1, eliminating bake requirements prior to reflow soldering.
What is the maximum steady-state power dissipation rating for SMAJ36CH?
The SMAJ36CH has a steady-state power dissipation (PD) rating of 1 W at 25 °C ambient temperature. This value decreases linearly with increasing ambient temperature per the derating curve in Figure 2 of the datasheet. At 100 °C ambient, PD drops to approximately 0.5 W. This rating applies only to continuous DC or low-frequency reverse-bias conditions - not to transient surge events, which are governed by the 400 W peak pulse power specification.
How does the leakage current of SMAJ36CH compare to other TVS diodes in its voltage class?
SMAJ36CH exhibits ≤1 µA maximum reverse leakage current (IR) at its 36 V working stand-off voltage (VWM), measured at 25 °C. This is significantly lower than many legacy TVS devices in the 30–40 V range, supporting ultra-low-power always-on circuits such as automotive wake-up receivers and battery-monitoring systems. The low IR is enabled by Taiwan Semiconductor's glass-passivated junction process and tight process control, confirmed across production lots.
SMAJ36CH 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):
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ36CH FAQ
1.How can I place an order for SMAJ36CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ36CH 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 SMAJ36CH reliable?
The price and inventory of SMAJ36CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ36CH is usually 5 days.
3.What payment methods are accepted for SMAJ36CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ36CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ36CH?
SMAJ36CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ36CH 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 SMAJ36CH?
For technical support, including SMAJ36CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ36CH requirements.
6.How does Aetrix verify that SMAJ36CH is sourced from the original manufacturer or authorized distributors?
All SMAJ36CH 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 SMAJ36CH meets industry standards.
7.What is the process for return or replacement of SMAJ36CH?
All SMAJ36CH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ36CH, 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 SMAJ36CH part is unused and in its original packaging.
Return procedure for SMAJ36CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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