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Taiwan Semiconductor Corporation SMAJ36CA
- Part No.:
- SMAJ36CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ36CA.pdf
- Description:
- TVS DIODE 36VWM 58.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,285
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Product details
Overview
SMAJ36CA from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for robust overvoltage protection in DC power rails and signal lines. It features a 36 V working stand-off voltage (VWM), 40.0–44.2 V breakdown voltage (VBR), 58.1 V maximum clamping voltage (VC) at 6.9 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the SMAJ36CA datasheet, SMAJ36CA pinout, SMAJ36CA application, or SMAJ36CA equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, unidirectional vs. bidirectional configuration (CA = bidirectional), moisture sensitivity level (MSL 1), and compatibility with automated SMT placement on industrial power converters and automotive ECUs.
Technical Context
The SMAJ36CA operates as a silicon avalanche diode with glass-passivated junction, enabling sub-1.0 ps response time from 0 V to VBR min. Its bidirectional structure provides symmetrical clamping in both polarities, eliminating polarity dependency in AC-coupled or floating bus applications.
It meets ISO 7637-2 immunity requirements for automotive transients and supports steady-state power dissipation of 1 W at 25 °C, with junction temperature range from –55 °C to +150 °C and thermal derating above ambient 25 °C per Fig.2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 36 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 40.0–44.2 V @ 1 mA - Ensures reliable avalanche conduction onset within defined tolerance band |
| VC @ IPPM | 58.1 V @ 6.9 A - Clamping voltage during 10/1000 µs surge limits downstream IC stress |
| PPPM | 400 W (10/1000 µs) - Peak surge energy handling capacity for transient suppression |
| IR @ VWM | ≤1 µA - Minimal leakage ensures low quiescent power loss in always-on protection circuits |
| Package | DO-214AC (SMA) - Standard surface-mount outline compatible with JEDEC MS-013, 0.060 g weight |
| TJ max | +150 °C - Enables operation in under-hood automotive or high-ambient industrial environments |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band (bidirectional symmetry means no functional anode/cathode distinction; band denotes terminal marking convention only).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (marked end) | Transient return path (bidirectional) | Functions identically as cathode under reverse surge; band indicates standardized terminal identification per marking diagram |
| Cathode (unmarked end) | Transient return path (bidirectional) | Electrically symmetric to anode; both terminals clamp equally in either polarity per device specification |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable, repeatable avalanche characteristics and long-term reliability under repeated surge events |
| Sub-1.0 ps response time | Clamps transients before sensitive downstream logic or analog circuitry can be damaged |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive ECU and body control module protection without additional filtering |
| MSL Level 1 (per J-STD-020) | Zero floor-life limitation - can be mounted directly from reel without baking or dry-pack handling |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing and end-of-life processing |
Applications
| Automotive Body Control Module (BCM) | Industrial DC/DC Converter Input Stage |
|---|---|
Use Scenario: Protecting LIN bus interface and power supply inputs against load dump and inductive switching spikes in vehicle door modules and lighting controllers. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed across VBAT and GND, absorbing ISO 7637-2 Pulse 5a (load dump) up to 400 W. Use Value: Limits voltage excursion to ≤58.1 V during 6.9 A surge, preventing latch-up or gate oxide damage in 3.3 V/5 V microcontrollers and CAN/LIN transceivers. | Use Scenario: Safeguarding primary-side MOSFET gate drivers and controller ICs in isolated 24 V-to-5 V flyback converters used in factory automation I/O modules. IC Role / Device Role / Timing Role: Fast-response overvoltage clamp on input rail, triggered within <1 ps to suppress ringing and ESD-induced overshoot from relay switching. Use Value: Maintains system uptime by preventing single-event burnout of PWM controllers (e.g., UC384x) during 10/1000 µs surges up to 400 W. |
| LED Driver Power Supply | Telecom PoE-PD Interface |
Use Scenario: Suppressing turn-off transients from inductive LED strings in streetlight drivers subjected to lightning-induced surges on AC mains input. IC Role / Device Role / Timing Role: Secondary-side TVS on DC output bus, clamping flyback voltage spikes generated by rapid current interruption in constant-current LED loads. Use Value: Keeps output voltage below 60 V during 6.9 A transients, protecting LED driver ICs (e.g., LM3409) and electrolytic bulk capacitors rated at 63 V. | Use Scenario: Providing secondary-side surge protection on powered-device (PD) Ethernet ports in IEEE 802.3af/at-compliant VoIP phones and IP cameras. IC Role / Device Role / Timing Role: Bidirectional clamping element across PD input pins (VDD/GND), meeting IEC 61000-4-5 Level 3 (1 kV/2 kV) requirements. Use Value: Clamps common-mode surges to ≤58.1 V while maintaining <1 µA leakage, avoiding false triggering of PD classification circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ36CA (Bourns) | Same VWM (36 V), higher PPPM (600 W), larger SMB package (DO-214AA) | Requires PCB layout change due to 4.6 × 3.6 mm SMB vs. 4.2 × 2.6 mm SMA footprint | Select when higher surge margin is required and board space allows larger package |
| P6SMB36CA (ON Semiconductor) | Identical VWM (36 V), same DO-214AC (SMA) package, but lower PPPM (600 W) and higher VC (61.1 V @ 6.5 A) | Compatible drop-in replacement with identical mounting; slightly higher clamping increases risk to downstream 3.3 V logic | Acceptable where 61.1 V clamping is within system margin and sourcing flexibility is prioritized |
Compared with SMBJ36CA and P6SMB36CA, the SMAJ36CA offers optimal balance of compact DO-214AC footprint, 400 W surge rating, and low 58.1 V clamping-making it preferred for space-constrained automotive and industrial DC/DC designs where strict voltage ceiling matters.
Availability
SMAJ36CA is available at Aetrix Electronics and suitable for automotive body electronics, industrial DC/DC converters, LED lighting drivers, and telecom power-over-Ethernet (PoE) devices requiring stable component supply across extended production lifecycles.
Supply support for SMAJ36CA 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 Company (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for industrial, automotive, and consumer applications.
The SMAJ series is engineered specifically for high-reliability transient suppression in harsh environments, emphasizing fast response, low clamping, and automotive-grade qualification (ISO 7637-2, AEC-Q101 readiness).
FAQ
What does the "CA" suffix indicate in SMAJ36CA?
The "CA" suffix in SMAJ36CA denotes a bidirectional configuration, meaning the device provides symmetrical transient voltage clamping in both forward and reverse directions. Unlike unidirectional variants (e.g., SMAJ36A), SMAJ36CA has no functional anode or cathode-both terminals behave identically under surge conditions. This makes SMAJ36CA ideal for AC-coupled lines, floating buses, or applications where polarity cannot be guaranteed, such as LIN or RS-485 interfaces.
How does SMAJ36CA perform under ISO 7637-2 Pulse 5a (load dump)?
SMAJ36CA is explicitly rated to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b, but not Pulse 5a (load dump), which requires higher energy handling (≥1000 W). While SMAJ36CA's 400 W rating may absorb minor load dump artifacts, full Pulse 5a compliance typically demands higher-power devices like 5.0SMDJ36CA. For robust load dump protection, SMAJ36CA should be paired with upstream passive filtering or used in conjunction with dedicated load dump suppressors-not deployed alone on battery-rail inputs.
Is SMAJ36CA compatible with lead-free reflow soldering profiles?
Yes, SMAJ36CA supports standard lead-free reflow soldering per JEDEC J-STD-020. Its DO-214AC (SMA) package uses matte tin-plated leads qualified for solderability per J-STD-002, and its MSL Level 1 rating means it can be processed directly from tape-and-reel without pre-baking. Peak reflow temperature up to 260 °C is permissible, and the device maintains mechanical integrity and electrical performance after exposure to typical Pb-free thermal profiles (e.g., IPC/JEDEC J-STD-020D).
What is the maximum allowable junction temperature for continuous operation of SMAJ36CA?
The maximum continuous junction temperature (TJ max) for SMAJ36CA is +150 °C, with operational range from –55 °C to +150 °C. At ambient temperatures above 25 °C, power derating applies per Fig.2 in the datasheet: for example, at TA = 85 °C, the steady-state power dissipation (PD) drops from 1 W to approximately 0.55 W. This thermal limit ensures long-term reliability in under-hood automotive or enclosed industrial enclosures where airflow is restricted.
Can SMAJ36CA be used in place of a unidirectional TVS like SMAJ36A?
No-SMAJ36CA and SMAJ36A are not interchangeable without circuit review. SMAJ36CA is bidirectional and clamps in both polarities, while SMAJ36A is unidirectional and only clamps in reverse bias. Substituting SMAJ36CA for SMAJ36A on a DC rail with defined polarity may cause unintended forward conduction or increased leakage during normal operation. Always verify polarity requirements, clamping symmetry needs, and system-level surge directionality before replacement.
SMAJ36CA 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:
- 58.1V
- Current - Peak Pulse (10/1000µs):
- 6.9A
- 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)
SMAJ36CA FAQ
1.How can I place an order for SMAJ36CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ36CA 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 SMAJ36CA reliable?
The price and inventory of SMAJ36CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ36CA is usually 5 days.
3.What payment methods are accepted for SMAJ36CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ36CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ36CA?
SMAJ36CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ36CA 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 SMAJ36CA?
For technical support, including SMAJ36CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ36CA requirements.
6.How does Aetrix verify that SMAJ36CA is sourced from the original manufacturer or authorized distributors?
All SMAJ36CA 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 SMAJ36CA meets industry standards.
7.What is the process for return or replacement of SMAJ36CA?
All SMAJ36CA units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ36CA, 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 SMAJ36CA part is unused and in its original packaging.
Return procedure for SMAJ36CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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