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Taiwan Semiconductor Corporation SMAJ15CAH
- Part No.:
- SMAJ15CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ15CAH.pdf
- Description:
- TVS DIODE 15VWM 24.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,699
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Product details
Overview
SMAJ15CAH from Taiwan Semiconductor is a bidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with 15V working stand-off voltage (VWM), 16.7–18.5V breakdown voltage (VBR), and 24.4V clamping voltage (VC) at 16.4A peak pulse current. It delivers sub-1ps response time and <1μA reverse leakage above 10V, designed for automotive-grade surge protection in DC/DC converters and SMPS inputs.
For engineers reviewing the SMAJ15CAH datasheet, SMAJ15CAH pinout, SMAJ15CAH application, or SMAJ15CAH equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, DO-214AC mechanical compatibility, and 150°C junction temperature rating.
Technical Context
SMAJ15CAH is a glass-passivated, single-die, bidirectional TVS diode optimized for fast transient suppression on power rails and signal lines. Its junction structure enables clamping within <1.0ps of overvoltage onset and sustains 400W peak pulse power (10/1000μs waveform) up to 78V VWM - derated to 300W above that threshold.
The device operates across –55°C to +150°C junction temperature range, meets J-STD-020 moisture sensitivity level 1, and features matte tin-plated leads compliant with J-STD-002 solderability. Polarity is marked by cathode band; for bidirectional use, no polarity orientation is required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 16.7 V / 18.5 V at 1 mA - ensures reliable breakdown activation above normal rail voltage |
| VC @ IPPM | 24.4 V at 16.4 A - limits downstream voltage stress during 10/1000μs transients |
| PPPM | 400 W (10/1000μs) - handles automotive load dump and inductive switching surges |
| IR @ VWM | <1 μA - negligible standby power loss and minimal impact on high-impedance circuits |
| TJ max | +150 °C - supports under-hood and industrial ambient environments without thermal derating |
| Package | DO-214AC (SMA) - industry-standard surface-mount footprint compatible with automated assembly |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case rated UL 94V-0, matte tin-plated leads, 0.060g mass, polarity marked by cathode band (not functional for bidirectional operation).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode | Bidirectional terminal pair | Identical clamping behavior in both directions; no polarity dependency in circuit placement |
| Cathode band | Marking only | Visual aid for unidirectional variants; irrelevant for SMAJ15CAH functionality |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including temperature cycling, HTRB, and ESD |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| Glass passivated junction | Enhances long-term reliability and stability of VBR and VC under thermal and humidity stress |
| Fast response time <1.0 ps | Clamps before transient energy couples into sensitive ICs, protecting gate oxides and analog front-ends |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally constrained applications |
Applications
| Automotive Infotainment Power Rail | Industrial SMPS Input Stage |
|---|---|
Use Scenario: Protects 12V supply input of head unit MCU and audio codec against load dump and jump-start transients. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed upstream of input filter and primary regulator. Use Value: Limits voltage to ≤24.4V during 400W pulses, preventing latch-up or permanent damage to 3.3V/5V domain ICs. | Use Scenario: Shields AC/DC adapter output and DC/DC converter input from line surges and cross-talk in factory automation systems. IC Role / Device Role / Timing Role: Standoff-rated transient suppressor co-located with bulk capacitor on 24V or 48V bus. Use Value: Maintains system uptime by absorbing repetitive 10/1000μs surges without degradation, supported by 150°C TJ rating. |
| LED Driver Module Protection | On-Board Charger (OBC) Auxiliary Supply |
Use Scenario: Safeguards constant-current LED driver ICs from inductive kickback when driving high-power lighting arrays. IC Role / Device Role / Timing Role: Fast-clamping TVS across driver input terminals, adjacent to MOSFET switch node. Use Value: Sub-1ps response prevents voltage overshoot beyond 24.4V, preserving gate oxide integrity and PWM timing accuracy. | Use Scenario: Secures low-voltage auxiliary rail (e.g., 12V or 15V) powering OBC control logic and CAN transceivers. IC Role / Device Role / Timing Role: Bidirectional clamping device on isolated auxiliary supply, meeting automotive EMC immunity targets. Use Value: Enables ISO 7637-2 Pulse 3b compliance with <1μA leakage, avoiding false resets or brownouts during noise events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ15CA | Same electrical specs but non-AEC-Q101; lacks automotive qualification testing | Not suitable for automotive production; acceptable for industrial prototypes | Select SMAJ15CAH when AEC-Q101 compliance and ISO 7637-2 validation are mandatory |
| SMBJ15CAH | Same VWM/VBR/VC but in larger DO-214AA (SMB) package; 600W PPPM rating | Higher power handling but requires larger PCB area and different pad layout | Choose SMBJ15CAH only if system-level surge energy exceeds 400W or thermal margin is constrained |
Compared with SMAJ15CA and SMBJ15CAH, SMAJ15CAH uniquely balances AEC-Q101 qualification, DO-214AC space efficiency, and verified 400W ISO 7637-2 immunity - making it optimal for compact, production-ready automotive and industrial power interfaces.
Availability
SMAJ15CAH is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial SMPS designs, and LED driver modules requiring stable component supply with full traceability and lifecycle support.
Supply support for SMAJ15CAH 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, serving global automotive, industrial, and consumer markets since 1979.
SMAJ series TVS diodes are engineered specifically for robust, standards-compliant transient protection in harsh environments - emphasizing AEC-Q101 reliability, fast clamping, and seamless integration into automated SMT lines.
FAQ
What does the "CAH" suffix indicate in SMAJ15CAH?
The "CAH" suffix in SMAJ15CAH denotes a bidirectional configuration ("C"), AEC-Q101 qualification ("A"), and halogen-free construction ("H"). Unlike unidirectional variants (e.g., SMAJ15AH), SMAJ15CAH provides symmetrical clamping in both polarities - critical for AC-coupled or floating-rail protection where polarity cannot be guaranteed. This is confirmed in the datasheet's "Devices for Bipolar Applications" section.
Does SMAJ15CAH meet ISO 7637-2 Pulse 1 requirements?
Yes, SMAJ15CAH is explicitly rated to meet ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) per the manufacturer's documentation. Its 400W peak pulse power rating (10/1000μs), 24.4V clamping voltage at 16.4A, and 150°C junction rating ensure compliance under worst-case automotive test conditions without derating.
What is the maximum clamping voltage of SMAJ15CAH and at what current is it specified?
The maximum clamping voltage (VC) of SMAJ15CAH is 24.4 V, measured at the peak impulse current (IPPM) of 16.4 A using the standardized 10/1000μs double-exponential waveform. This value is guaranteed across the full operating temperature range (–55°C to +150°C) and defines the upper voltage limit imposed on protected circuitry during transient events.
Is SMAJ15CAH compatible with lead-free reflow soldering processes?
Yes, SMAJ15CAH uses matte tin-plated leads qualified per J-STD-002 for solderability and is rated for lead-free reflow profiles. Its DO-214AC package withstands peak temperatures up to 260°C for 10 seconds, and the device meets JESD201 Class 2 whisker resistance - ensuring reliable interconnect integrity in modern RoHS-compliant manufacturing.
How does SMAJ15CAH differ from SMAJ15AH in practical circuit design?
SMAJ15AH is unidirectional with cathode-anode polarity, requiring correct orientation in-circuit; SMAJ15CAH is bidirectional and orientation-agnostic. Electrically, SMAJ15CAH has identical VWM (15 V), VBR (16.7–18.5 V), and VC (24.4 V), but its bidirectional symmetry eliminates routing constraints and simplifies layout in differential or AC-fed rails - a key advantage confirmed in the "Devices for Bipolar Applications" note.
SMAJ15CAH 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):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 24.4V
- Current - Peak Pulse (10/1000µs):
- 16.4A
- 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)
SMAJ15CAH FAQ
1.How can I place an order for SMAJ15CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ15CAH 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 SMAJ15CAH reliable?
The price and inventory of SMAJ15CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ15CAH is usually 5 days.
3.What payment methods are accepted for SMAJ15CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ15CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ15CAH?
SMAJ15CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ15CAH 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 SMAJ15CAH?
For technical support, including SMAJ15CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ15CAH requirements.
6.How does Aetrix verify that SMAJ15CAH is sourced from the original manufacturer or authorized distributors?
All SMAJ15CAH 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 SMAJ15CAH meets industry standards.
7.What is the process for return or replacement of SMAJ15CAH?
All SMAJ15CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ15CAH, 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 SMAJ15CAH part is unused and in its original packaging.
Return procedure for SMAJ15CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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