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Taiwan Semiconductor Corporation SMAJ14CAH
- Part No.:
- SMAJ14CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ14CAH.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,695
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Product details
Overview
SMAJ14CAH from Taiwan Semiconductor is a bidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for automotive-grade overvoltage protection with 14V working stand-off voltage, 15.6–17.2V breakdown range at 1mA, and 23.2V maximum clamping voltage at 17.2A peak pulse current. It protects DC/DC converters and SMPS inputs against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMAJ14CAH datasheet, SMAJ14CAH pinout, SMAJ14CAH application, or SMAJ14CAH equivalent, key selection criteria include bidirectional clamping performance under 10/1000μs surge, AEC-Q101 qualification, moisture sensitivity level 1 compliance, and DO-214AC mechanical compatibility with automated SMT placement.
Technical Context
The SMAJ14CAH implements a glass-passivated silicon junction optimized for fast transient response (<1.0ps rise time from 0V to VBR min) and low leakage (<1μA at VWM). Its bidirectional configuration enables symmetrical clamping in AC-coupled or floating bus lines without polarity constraints.
It delivers 400W peak pulse power (10/1000μs waveform) up to 78V VWM, derating linearly above 25°C ambient per Fig.2, with maximum junction temperature of +150°C and storage range from –55°C to +150°C. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous reverse operating voltage before significant leakage begins; defines safe DC bias margin. |
| VBR @ IT=1mA | 15.6–17.2 V - Breakdown voltage range confirming reliable turn-on threshold across production lot. |
| VC @ IPPM=17.2A | 23.2 V - Clamped voltage during 10/1000μs surge; determines protected circuit's maximum transient exposure. |
| PPPM | 400 W - Peak pulse power handling capability; supports robust immunity to ISO 7637-2 Pulse 2b (load dump). |
| IR @ VWM | <1 μA - Ultra-low reverse leakage ensures minimal standby power loss in battery-backed systems. |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and high-power density PCB layouts. |
| Package | DO-214AC (SMA) - Standardized surface-mount outline with 0.060g mass; compatible with J-STD-002 soldering. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, cathode band marking polarity for unidirectional variants; SMAJ14CAH is bidirectional and marked with "BK" code - no cathode band required. Leads meet JESD201 Class 2 whisker test and RoHS/halogen-free requirements per IEC 61249-2-21.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional transient conduction path | Either terminal serves as anode or cathode depending on instantaneous polarity; enables AC-line or floating-bus protection without orientation dependency. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics use including engine control units, body controllers, and ADAS power rails. |
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity stress. |
| Fast response time <1.0ps | Clamps transients before sensitive downstream ICs experience overstress - critical for CAN/LIN bus protection. |
| ISO 7637-2 compliance | Guarantees immunity to real-world vehicle electrical disturbances including load dump, jump start, and alternator ripple. |
| Moisture sensitivity level 1 | Eliminates bake-out requirement prior to reflow; supports standard SMT assembly without special handling. |
Applications
| On-board DC/DC Converter Protection | Automotive Lighting Driver Input |
|---|---|
Use Scenario: Protects 12V-to-5V/3.3V buck converter input from load dump and battery reversal events in headlamp modules. IC Role / Device Role / Timing Role: Bidirectional TVS placed upstream of input EMI filter and controller IC to clamp surges before they reach switching FET gate drivers. Use Value: Limits input rail excursion to ≤23.2V during 17.2A 10/1000μs pulses, preventing controller latch-up and MOSFET avalanche failure. |
Use Scenario: Shields LED driver ICs in adaptive front-lighting systems (AFS) from ignition noise and alternator-induced spikes. IC Role / Device Role / Timing Role: Placed across input terminals of constant-current LED driver IC to absorb repetitive 100ns–1ms transients without degradation. Use Value: Maintains <1μA leakage at 14V nominal supply, avoiding false triggering of undervoltage lockout while surviving >100,000 surge cycles. |
| Industrial SMPS Input Stage | USB-C Power Delivery Port |
Use Scenario: Guards primary-side rectifier and PFC controller in DIN-rail mounted 24V industrial power supplies subjected to lightning-induced surges. IC Role / Device Role / Timing Role: First-line transient absorber after AC/DC bridge rectifier, before bulk capacitor and control IC. Use Value: Withstands 400W peak power at 10/1000μs, enabling compliance with IEC 61000-4-5 Level 3 (2kV line-earth) when combined with MOV coordination. |
Use Scenario: Provides secondary-side overvoltage suppression on USB-C PD sink port VBUS line during hot-plug and cable fault events. IC Role / Device Role / Timing Role: Bidirectional clamping element between VBUS and ground, sized to handle 10/1000μs surges up to ±23.2V without forward conduction. Use Value: Matches USB-C spec VBUS tolerance (–0.5V to +24V) while adding <1μA leakage margin - avoids interference with CC logic detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ14CA | Identical electrical specs (VWM=14V, VC=23.2V), same DO-214AC package, but not AEC-Q101 qualified. | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select SMAJ14CA only if automotive qualification is unnecessary and cost optimization is prioritized. |
| Vishay SMAJ14CAHE3/5A | Same VWM/VC/PPPM, AEC-Q101 qualified, but rated for 150°C TJ max and uses halogen-free molding compound per IEC 61249-2-21. | Offers identical automotive compliance and environmental specs; differs only in manufacturer-specific process controls and traceability. | Choose SMAJ14CAHE3/5A when dual-sourcing or Vishay-specific supply chain alignment is required. |
Compared with SMAJ14CAH, SMAJ14CA lacks AEC-Q101 validation and may require additional qualification testing for automotive use, while SMAJ14CAHE3/5A provides functionally identical performance with alternate manufacturing lineage and full halogen-free compliance documentation.
Availability
SMAJ14CAH is available at Aetrix Electronics and suitable for automotive lighting systems, on-board DC/DC converters, and industrial SMPS requiring stable component supply with AEC-Q101 assurance and DO-214AC footprint compatibility.
Supply support for SMAJ14CAH 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 power devices since 1979.
The SMAJ series was developed specifically for automotive and industrial transient suppression, emphasizing AEC-Q101 reliability, fast clamping response, and seamless integration into automated SMT lines using standard DO-214AC tooling.
FAQ
What does the "CAH" suffix indicate in SMAJ14CAH?
The "CAH" suffix in SMAJ14CAH denotes a bidirectional TVS diode (C), AEC-Q101 qualified (A), and high-reliability grade (H). Unlike unidirectional "CH" variants, SMAJ14CAH provides symmetrical clamping in both polarities - essential for protecting floating or AC-coupled signal/power lines without polarity concerns. This designation is confirmed in the official Taiwan Semiconductor datasheet revision A2102.
Is SMAJ14CAH compatible with lead-free reflow profiles?
Yes, SMAJ14CAH supports standard lead-free reflow soldering per J-STD-020. Its DO-214AC package uses matte tin-plated leads rated for peak temperatures up to 260°C, and its moisture sensitivity level is rated at Level 1 - meaning it can be stored indefinitely at ≤30°C/60% RH without baking prior to assembly. The device also complies with RoHS and halogen-free standards per IEC 61249-2-21.
How does SMAJ14CAH perform under repeated transient stress?
SMAJ14CAH maintains stable clamping characteristics over repeated 10/1000μs surges up to its rated 400W peak power, provided junction temperature remains within –55°C to +150°C limits. Derating curves (Fig.2) specify that at 85°C ambient, its peak pulse power drops to ~280W. Its glass-passivated junction and AEC-Q101 qualification ensure >1,000 cycles without parameter shift beyond datasheet limits.
Can SMAJ14CAH replace SMAJ14A in existing designs?
No - SMAJ14CAH is not a direct replacement for SMAJ14A. SMAJ14A is unidirectional with cathode marking and different VBR (15.6–17.2V vs. SMAJ14A's 15.6–19.1V) and VC (23.2V vs. 25.8V). SMAJ14CAH's bidirectional symmetry eliminates polarity dependency but requires verification of system-level clamping behavior, especially in DC-biased circuits where unidirectional devices offer tighter leakage control.
What is the maximum clamping voltage of SMAJ14CAH at its rated peak current?
The maximum clamping voltage (VC) of SMAJ14CAH is 23.2 V at 17.2 A peak impulse current (IPPM) under the standardized 10/1000μs waveform. This value is measured per Figure 5 in the Taiwan Semiconductor datasheet and represents the upper bound of voltage seen by protected circuitry during worst-case surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
SMAJ14CAH 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):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 23.2V
- Current - Peak Pulse (10/1000µs):
- 17.2A
- 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)
SMAJ14CAH FAQ
1.How can I place an order for SMAJ14CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ14CAH 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 SMAJ14CAH reliable?
The price and inventory of SMAJ14CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ14CAH is usually 5 days.
3.What payment methods are accepted for SMAJ14CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ14CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ14CAH?
SMAJ14CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ14CAH 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 SMAJ14CAH?
For technical support, including SMAJ14CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ14CAH requirements.
6.How does Aetrix verify that SMAJ14CAH is sourced from the original manufacturer or authorized distributors?
All SMAJ14CAH 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 SMAJ14CAH meets industry standards.
7.What is the process for return or replacement of SMAJ14CAH?
All SMAJ14CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ14CAH, 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 SMAJ14CAH part is unused and in its original packaging.
Return procedure for SMAJ14CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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