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Taiwan Semiconductor Corporation SMAJ17CAH
- Part No.:
- SMAJ17CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ17CAH.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,143
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Product details
Overview
SMAJ17CAH from Taiwan Semiconductor is a bidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for automotive-grade overvoltage protection with 17V working stand-off voltage (VWM), 18.9–20.9V breakdown voltage (VBR), and 30.5V clamping voltage (VC) at 13.1A peak pulse current. It meets AEC-Q101 qualification and ISO 7637-2 Pulse 1/2a/2b/3a/3b for robust vehicle electrical system protection.
For engineers reviewing the SMAJ17CAH datasheet, SMAJ17CAH pinout, SMAJ17CAH application, or SMAJ17CAH equivalent, this device is selected for high-reliability DC bus protection in automotive power modules, on-board DC/DC converters, and industrial SMPS where fast clamping (<1.0ps response), low leakage (<1µA @ VWM), and bidirectional surge immunity are critical.
Technical Context
The SMAJ17CAH is a glass-passivated, single-die, bidirectional TVS diode optimized for transient suppression on 12V/24V automotive supply rails. Its junction operates from –55°C to +150°C, with steady-state power dissipation of 1W and peak pulse power of 400W under 10/1000μs waveform.
It features polarity marking (cathode band not applicable for bidirectional configuration), matte tin-plated leads compliant with J-STD-002, and moisture sensitivity level 1 per J-STD-020 - enabling direct use in automated SMT assembly without baking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin above 12V nominal rail. |
| VBR min/max | 18.9 V / 20.9 V @ 1 mA - Confirmed breakdown threshold range ensures reliable turn-on during transients without premature conduction. |
| VC @ IPPM | 30.5 V @ 13.1 A - Clamped voltage during 10/1000μs surge; limits downstream IC stress to <31V under worst-case 400W event. |
| PPPM | 400 W (10/1000μs) - Peak pulse power rating defines maximum energy absorption capability per transient event. |
| IR @ VWM | <1 µA - Ultra-low reverse leakage preserves efficiency in always-on power rails and avoids battery drain. |
| TJ max | +150 °C - Enables operation in under-hood environments and high-power density converter enclosures. |
Pinout & Package
DO-214AC (SMA) surface-mount package: 2-terminal, bidirectional configuration with cathode band omitted per marking convention for CAH-series devices. Dimensions conform to JEDEC DO-214AC standard; recommended pad layout provided in TSC Package Outline Drawing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient path | No polarity dependency - connects across protected line and ground (or between differential lines) without orientation constraint. |
| Case (exposed metal) | Non-electrical thermal path | DO-214AC body provides mechanical anchoring and minor thermal conduction; no internal connection to die. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TC, UHAST, and ESD - supports PPAP compliance. |
| Fast response time | <1.0 ps from 0 V to VBR min - enables clamping before sensitive downstream circuitry experiences overvoltage damage. |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) - certified for 12V/24V vehicle networks. |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive - supports environmental compliance in global automotive supply chains. |
Applications
| Automotive Power Distribution | On-Board DC/DC Converters |
|---|---|
Use Scenario: Protection of 12V main distribution bus against load dump and alternator transients in engine control units and body controllers. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed between battery rail and ground, absorbing up to 400W surges within nanoseconds. Use Value: Limits rail voltage to ≤30.5V during ISO 7637-2 Pulse 5a events, preventing latch-up or burnout in MCU power supplies. | Use Scenario: Input-side surge suppression for 12V-to-5V/3.3V buck converters powering ADAS sensors and infotainment processors. IC Role / Device Role / Timing Role: Primary transient shunt at converter input, activated before upstream fuse or controller IC responds. Use Value: Maintains stable input voltage during 10/1000μs spikes, avoiding converter shutdown or output droop affecting real-time sensor data. |
| Industrial SMPS Inputs | LED Driver Power Stages |
Use Scenario: Front-end protection of AC/DC and DC/DC switch-mode power supplies in factory automation equipment exposed to inductive switching noise. IC Role / Device Role / Timing Role: Parallel-connected TVS across bulk capacitor input, clamping line-to-ground transients. Use Value: Withstands repetitive 400W pulses without degradation, extending PSU lifetime in electrically noisy plant environments. | Use Scenario: Overvoltage safeguard for constant-current LED drivers in street lighting systems subject to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Bidirectional clamp across driver output terminals to protect MOSFETs and current-sense resistors. Use Value: Clamps induced transients to ≤30.5V, preventing gate oxide rupture in high-side switches and preserving LED string integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ17AHE3/5BT | Same VWM (17V), identical DO-214AC package, but Vishay variant with slightly higher VC (32.2V @ 12.4A) and lower IPPM (12.4A vs 13.1A). | Marginally reduced clamping performance; suitable where tighter board space allows trade-off in peak current handling. | Select SMAJ17AHE3/5BT only if Vishay's qualification documentation aligns with program-specific AEC-Q101 revision requirements. |
| P6SMB17CA | Same VWM (17V), DO-214AA (SMB) package - larger footprint (4.6 × 3.95 mm vs SMA's 4.3 × 2.6 mm) and 600W rating (10/1000μs), but higher VC (33.2V @ 18.1A). | Requires PCB layout change; preferred where higher energy absorption justifies added area and cost. | Choose P6SMB17CA when system-level surge testing exceeds 400W or when existing SMB footprint is standardized across BOM. |
Compared with SMAJ17CAH, SMAJ17AHE3/5BT offers identical form factor but trades 1.7V higher clamping voltage for broader manufacturer support, while P6SMB17CA delivers 50% more pulse power at the cost of larger size and non-drop-in replacement - making SMAJ17CAH optimal for space-constrained AEC-Q101-compliant 12V rail protection.
Availability
SMAJ17CAH is available at Aetrix Electronics and suitable for automotive power distribution, on-board DC/DC converters, and industrial SMPS requiring stable component supply with full AEC-Q101 traceability and ISO 7637-2 compliance.
Supply support for SMAJ17CAH 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, and automotive-qualified components since 1979.
The SMAJ series was developed specifically for AEC-Q101-compliant transient suppression in automotive 12V/24V systems, emphasizing fast response, low leakage, and robust ISO 7637-2 pulse immunity in compact DO-214AC packaging.
FAQ
What does the 'CAH' suffix indicate in SMAJ17CAH?
The 'CAH' suffix in SMAJ17CAH denotes a bidirectional configuration with AEC-Q101 qualification and halogen-free construction. Unlike unidirectional 'H' variants, the 'C' signifies symmetrical clamping in both polarities - essential for protecting differential lines or floating rails where polarity reversal may occur. SMAJ17CAH maintains the same 17V VWM and DO-214AC package as its unidirectional counterparts but omits cathode band marking.
Does SMAJ17CAH meet ISO 7637-2 Pulse 5a (load dump) requirements?
SMAJ17CAH is rated for ISO 7637-2 Pulses 1, 2a, 2b, 3a, and 3b per official Taiwan Semiconductor documentation, but Pulse 5a (load dump) requires higher energy handling (typically >1000W). SMAJ17CAH's 400W rating is insufficient for direct Pulse 5a suppression; it must be used in conjunction with a dedicated load dump suppressor or upstream TVS array. For standalone Pulse 5a, higher-power alternatives like 5.0SMDJ17CA are recommended.
What is the maximum clamping voltage of SMAJ17CAH under standard test conditions?
The maximum clamping voltage (VC) of SMAJ17CAH is 30.5 V at 13.1 A peak pulse current (IPPM), measured using the standard 10/1000μs double-exponential waveform. This value is guaranteed across the full operating temperature range (–55°C to +150°C) and represents the upper limit of voltage imposed on protected circuitry during a worst-case transient event.
Can SMAJ17CAH be used in place of SMAJ17AH in an existing design?
No - SMAJ17CAH and SMAJ17AH are not interchangeable. SMAJ17AH is unidirectional (cathode-marked, asymmetrical conduction), while SMAJ17CAH is bidirectional (no polarity marking, symmetrical clamping). Substituting SMAJ17CAH for SMAJ17AH would eliminate forward-voltage blocking capability on one polarity, potentially causing short-circuit behavior in DC-biased applications. Always verify circuit topology before replacement.
Is SMAJ17CAH compatible with lead-free reflow soldering processes?
Yes, SMAJ17CAH is fully compatible with lead-free reflow soldering. Its matte tin-plated leads meet J-STD-002 solderability requirements, and the DO-214AC package is rated for peak reflow temperatures up to 260°C per JEDEC J-STD-020 (MSL Level 1). No pre-baking is required due to its moisture sensitivity level 1 classification, supporting direct placement into standard Pb-free reflow profiles.
SMAJ17CAH 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):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 27.6V
- Current - Peak Pulse (10/1000µs):
- 14.5A
- 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)
SMAJ17CAH FAQ
1.How can I place an order for SMAJ17CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ17CAH 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 SMAJ17CAH reliable?
The price and inventory of SMAJ17CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ17CAH is usually 5 days.
3.What payment methods are accepted for SMAJ17CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ17CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ17CAH?
SMAJ17CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ17CAH 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 SMAJ17CAH?
For technical support, including SMAJ17CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ17CAH requirements.
6.How does Aetrix verify that SMAJ17CAH is sourced from the original manufacturer or authorized distributors?
All SMAJ17CAH 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 SMAJ17CAH meets industry standards.
7.What is the process for return or replacement of SMAJ17CAH?
All SMAJ17CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ17CAH, 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 SMAJ17CAH part is unused and in its original packaging.
Return procedure for SMAJ17CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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