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Taiwan Semiconductor Corporation SMAJ36CAH
- Part No.:
- SMAJ36CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ36CAH.pdf
- Description:
- TVS DIODE 36VWM 58.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,450
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Product details
Overview
SMAJ36CAH from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for automotive-grade overvoltage protection. It features a 36 V working stand-off voltage (VWM), 40.0–44.2 V breakdown voltage (VBR @ 1 mA), and clamps transients to ≤58.1 V at 6.9 A peak impulse current under 10/1000 µs waveform - ideal for protecting CAN bus interfaces and DC/DC converter inputs in harsh environments.
For engineers reviewing the SMAJ36CAH datasheet, SMAJ36CAH pinout, SMAJ36CAH application, or SMAJ36CAH equivalent, key selection criteria include its AEC-Q101 qualification, bidirectional clamping symmetry, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and 400 W peak pulse power rating at TA = 25°C - critical for automotive ECU and infotainment power rail protection.
Technical Context
The SMAJ36CAH implements a glass-passivated silicon junction optimized for fast transient response (<1.0 ps from 0 V to VBR,min) and low leakage (<1 µA @ VWM). Its bidirectional configuration enables symmetrical clamping in AC-coupled or floating signal lines without polarity dependency.
It operates across –55°C to +150°C junction temperature range and meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1 - confirming suitability for reflow-soldered automotive PCB assemblies requiring long-term reliability under thermal cycling and vibration stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 36 V - maximum continuous reverse operating voltage before conduction begins; defines safe operating margin above system nominal voltage. |
| VBR @ IT = 1 mA | 40.0–44.2 V - verified breakdown threshold ensuring predictable turn-on during surge events without premature triggering. |
| VC @ IPPM = 6.9 A | ≤58.1 V - clamped voltage under 10/1000 µs surge; determines maximum stress imposed on downstream ICs during transient suppression. |
| PPPM | 400 W - peak pulse power handling per 10/1000 µs waveform; supports robust protection against load dump and inductive switching spikes. |
| IR @ VWM | <1 µA - ultra-low reverse leakage ensures minimal standby power loss and no signal integrity degradation in high-impedance circuits. |
| TJ Range | –55°C to +150°C - extended thermal operating envelope enabling use in engine bay and powertrain modules without derating. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, bi-directional configuration with cathode band omitted (symmetrical terminals). Matte tin-plated leads, UL 94V-0 molding compound, 0.060 g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient current path | Either terminal serves as input/output; bidirectional conduction eliminates polarity concerns during layout and assembly. |
| Case (body) | Thermal mass & mechanical anchor | DO-214AC body provides thermal dissipation path to PCB copper; no electrical connection required. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements - enables direct use in ASIL-B systems without additional qualification effort. |
| ISO 7637-2 compliant | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) - covers full vehicle-level EMC immunity testing scope. |
| Glass passivated junction | Ensures stable VBR and low leakage over lifetime; resists humidity-induced parameter drift in under-hood environments. |
| Fast response time <1.0 ps | Clamps before sensitive logic or analog circuitry responds - prevents latch-up or gate oxide damage in microcontrollers and transceivers. |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; compatible with standard SMT production lines without process modification. |
Applications
| Automotive Body Control Module (BCM) | Industrial DC/DC Converter Input |
|---|---|
Use Scenario: Protecting LIN bus transceiver power rails against battery voltage transients during jump-start or alternator load dump. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed between VBAT and GND, directly upstream of LDO regulator input. Use Value: Limits voltage to ≤58.1 V during 400 W surges, preventing regulator overvoltage shutdown and preserving communication continuity. |
Use Scenario: Safeguarding isolated flyback controller IC supply pins against reflected primary-side switching noise and output short-circuit recovery spikes. IC Role / Device Role / Timing Role: Transient suppressor across secondary-side bias winding output, referenced to local ground. Use Value: Clamps 10/1000 µs surges to <58.1 V within <1 ps, avoiding false triggering of undervoltage lockout or internal reset circuits. |
| On-Board Charger (OBC) Auxiliary Power Supply | LED Driver Input Stage |
Use Scenario: Shielding 12 V auxiliary supply feeding MCU and gate drivers from high-energy transients induced by high-voltage battery switching. IC Role / Device Role / Timing Role: Primary overvoltage protection device on OBC's low-voltage control board input rail. Use Value: Withstands repetitive 400 W pulses per ISO 7637-2 while maintaining <1 µA leakage - no impact on standby current budget. |
Use Scenario: Suppressing line surges on constant-current LED driver input in streetlight applications exposed to lightning-induced grid transients. IC Role / Device Role / Timing Role: First-line protection element between AC/DC rectifier output and buck controller input. Use Value: 36 V VWM aligns with 24 V nominal input; 58.1 V clamping prevents MOSFET avalanche failure during 10/1000 µs line spikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ36AHE3/5BT | Same VWM, VBR, and VC; identical DO-214AC package but manufactured by Vishay; RoHS-compliant with matte tin plating. | No functional difference; validated for same ISO 7637-2 pulses and AEC-Q101 stress profiles. | Select when dual-sourcing is required or when Vishay's supply chain offers better lead time or volume pricing. |
| 1.5SMC36CA | Higher PPPM = 1500 W (10/1000 µs), larger DO-214AB (SMB) package; VC = 58.1 V same, but VBR range wider (40.0–48.9 V). | Requires PCB footprint change; suited for higher-energy surge environments where 400 W is insufficient. | Choose only if system-level testing confirms need for >400 W pulse handling; otherwise, SMAJ36CAH offers superior space efficiency. |
Compared with SMAJ36AHE3/5BT, SMAJ36CAH offers identical electrical performance in an AEC-Q101-qualified Taiwan Semiconductor variant; versus 1.5SMC36CA, it trades higher power rating for 30% smaller footprint and lower thermal mass - optimizing for space-constrained automotive modules.
Availability
SMAJ36CAH is available at Aetrix Electronics and suitable for automotive ECUs, industrial DC/DC converters, and LED lighting systems requiring stable component supply with AEC-Q101 assurance and ISO 7637-2 compliance.
Supply support for SMAJ36CAH 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, and rectifiers with global automotive and industrial certifications.
The SMAJ series was developed specifically for AEC-Q101-compliant transient protection in automotive power networks and industrial power supplies - emphasizing reliability under thermal cycling, humidity, and high-energy surge stress.
FAQ
What does the "CAH" suffix indicate in SMAJ36CAH?
The "CAH" suffix denotes a bidirectional TVS diode with symmetrical clamping characteristics in both polarities. Unlike unidirectional variants (e.g., SMAJ36AH), SMAJ36CAH has no anode/cathode distinction and protects AC-coupled or floating nodes without polarity constraints - confirmed in TSC's datasheet Section "Devices for Bipolar Applications".
Is SMAJ36CAH suitable for CAN FD physical layer protection?
Yes, SMAJ36CAH is appropriate for CAN FD bus protection due to its 36 V VWM (above typical 24 V CAN FD supply rails), ≤58.1 V clamping voltage (within ISO 11898-2 receiver tolerance), and sub-1 ps response time - all verified in TSC's electrical specifications and ISO 7637-2 compliance statement for Pulse 3b.
Does SMAJ36CAH require derating at elevated ambient temperatures?
Yes, SMAJ36CAH must be derated above 25°C ambient per Figure 2 in the TSC datasheet: peak pulse power decreases linearly to ~200 W at 85°C and ~100 W at 125°C. Designers must apply this derating when sizing for sustained high-temperature environments like engine compartments.
How does SMAJ36CAH compare to SMAJ36AH in clamping performance?
SMAJ36CAH and SMAJ36AH share identical VWM (36 V) and VC (≤58.1 V @ 6.9 A), but SMAJ36AH is unidirectional with cathode marking. SMAJ36CAH provides symmetrical clamping in both directions - essential for differential or AC signals - whereas SMAJ36AH is limited to DC-biased single-ended protection.
What is the maximum steady-state power dissipation for SMAJ36CAH?
The maximum steady-state power dissipation (PD) for SMAJ36CAH is 1 W at TA = 25°C, as specified in the Absolute Maximum Ratings table. This value applies only to continuous DC or low-frequency reverse bias conditions - not transient suppression duty cycles.
SMAJ36CAH 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ36CAH FAQ
1.How can I place an order for SMAJ36CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ36CAH 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 SMAJ36CAH reliable?
The price and inventory of SMAJ36CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ36CAH is usually 5 days.
3.What payment methods are accepted for SMAJ36CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ36CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ36CAH?
SMAJ36CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ36CAH 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 SMAJ36CAH?
For technical support, including SMAJ36CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ36CAH requirements.
6.How does Aetrix verify that SMAJ36CAH is sourced from the original manufacturer or authorized distributors?
All SMAJ36CAH 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 SMAJ36CAH meets industry standards.
7.What is the process for return or replacement of SMAJ36CAH?
All SMAJ36CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ36CAH, 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 SMAJ36CAH part is unused and in its original packaging.
Return procedure for SMAJ36CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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