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Taiwan Semiconductor Corporation SMAJ14AH
- Part No.:
- SMAJ14AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ14AH.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,759
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Product details
Overview
SMAJ14AH from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for robust overvoltage protection in DC/DC converters and automotive power rails. It features a 14 V working stand-off voltage (VWM), 15.6–17.2 V breakdown voltage (VBR), 23.2 V clamping voltage (VC) at 17.2 A peak pulse current, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SMAJ14AH datasheet, SMAJ14AH pinout, SMAJ14AH application, or SMAJ14AH equivalent, this device is selected for high-speed clamping (<1.0 ps response), low leakage (<1 µA at 14 V), ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b), and stable performance across –55°C to +150°C junction temperature range.
Technical Context
The SMAJ14AH operates as a unidirectional avalanche diode with glass-passivated junction, optimized for fast transient suppression in 12 V nominal automotive and industrial power systems. Its clamping behavior follows a defined 10/1000 µs waveform, delivering 400 W peak pulse power up to 78 V VWM and 300 W above - confirmed by non-repetitive derating curves per Fig.2.
It meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity, with matte tin-plated leads solderable per J-STD-002. Polarity is marked by cathode band; bidirectional variants use CH/CAH suffixes - not applicable to SMAJ14AH.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous reverse operating voltage before significant leakage; sets system-level overvoltage trip threshold. |
| VBR min/max | 15.6 V / 17.2 V @ 1 mA - Confirmed avalanche onset range; ensures predictable turn-on under transients. |
| VC @ IPPM | 23.2 V @ 17.2 A - Clamped voltage during 10/1000 µs surge; limits downstream IC stress to safe levels. |
| PPPM | 400 W (10/1000 µs) - Peak surge energy handling capacity; supports ISO 7637-2 Pulse 1 & 2b immunity. |
| IR @ VWM | <1 µA - Ultra-low reverse leakage at rated stand-off; preserves efficiency in always-on power rails. |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and thermally constrained PCB layouts. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-diode configuration with cathode band marking. Dimensions conform to JEDEC DO-214AC standard; recommended pad layout provided in manufacturer datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side of protected line (e.g., battery rail) | Connected to source of transient energy; referenced to ground via cathode path during clamping. |
| Cathode | Ground reference / clamping node | Marked by band; ties to system ground plane to shunt surge current away from load. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements - enables use in engine control, body modules, and ADAS power supplies. |
| Clamping response time <1.0 ps | Enables protection of fast-switching MOSFETs and microcontrollers against ESD and load dump edges without signal distortion. |
| Glass passivated junction | Improves long-term reliability and stability of VBR under thermal cycling and humidity exposure. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive switch-off), Pulse 2a (battery disconnect), Pulse 2b (load dump), and Pulse 3a/3b (switching noise) test profiles. |
Applications
| Automotive Body Control Module (BCM) | Industrial DC/DC Converter Input Stage |
|---|---|
Use Scenario: Protects 12 V supply input of BCM from load dump transients (up to ±120 V, 400 ms) and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and DC/DC input filter capacitor. Use Value: Limits voltage seen by upstream buck controller to ≤23.2 V during 17.2 A surge, preventing latch-up or gate oxide damage. |
Use Scenario: Shields isolated flyback or forward converter primary-side controller from reflected surges on 24–48 V industrial bus inputs. IC Role / Device Role / Timing Role: Standoff protector on HV input rail, activated only during >14 V transients. Use Value: Maintains <1 µA leakage at nominal 24 V, avoiding standby power penalty while enabling 400 W surge absorption. |
| LED Driver Power Supply | Telecom Power Interface |
Use Scenario: Safeguards constant-current LED driver ICs from hot-swap and cable discharge events in streetlight or signage applications. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12–24 V input, positioned ahead of input EMI filter. Use Value: Clamps 10/1000 µs surges to 23.2 V within 1 ps, preserving driver IC integrity without affecting PWM dimming timing. |
Use Scenario: Provides secondary-side surge protection on 48 V phantom power input of telecom base station interface cards. IC Role / Device Role / Timing Role: Unidirectional TVS on DC feed line to protect PoE-like power management ICs. Use Value: Withstands repeated 10/1000 µs pulses up to 400 W while maintaining <1 µA leakage at 48 V nominal - critical for low-noise analog front-ends. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14A | Same VWM (14 V), but lower VBR min (15.6 V) and higher VC (23.2 V vs. 22.0 V for SMAJ14); no AEC-Q101 qualification. | Lacks automotive qualification; suitable for commercial/industrial use only. | Select SMAJ14A only if AEC-Q101 is not required and cost optimization is prioritized. |
| SMBJ14AH | Same electrical specs (VWM=14 V, VBR=15.6–17.2 V, VC=23.2 V), but SMB package (DO-214AA) - 2.5 mm wider, 0.2 mm taller, 1.5× footprint area. | Requires PCB layout change; offers higher thermal mass and 600 W PPPM rating. | Choose SMBJ14AH when higher surge margin or thermal dissipation is needed and board space permits larger package. |
Compared with SMAJ14A and SMBJ14AH, the SMAJ14AH uniquely combines AEC-Q101 qualification, DO-214AC compactness, and 400 W surge capability - making it optimal for space-constrained automotive modules where qualification and footprint are both critical.
Availability
SMAJ14AH is available at Aetrix Electronics and suitable for automotive body electronics, industrial DC/DC converters, and LED lighting power supplies requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for SMAJ14AH 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, rectifiers, and MOSFETs - serving automotive, industrial, and consumer markets since 1979.
The SMAJ series was developed specifically for AEC-Q101-compliant transient protection in 12 V/24 V automotive subsystems and ruggedized industrial power interfaces - emphasizing fast response, low leakage, and high surge endurance.
FAQ
What is the clamping voltage of SMAJ14AH and how is it measured?
The SMAJ14AH has a maximum clamping voltage (VC) of 23.2 V at 17.2 A peak pulse current, tested using the standardized 10/1000 µs double-exponential waveform per IEC 61000-4-5. This value represents the upper limit of voltage imposed on protected circuitry during a worst-case surge event - directly verified in TSC's characterization curves (Fig.5) and electrical specifications table.
Is SMAJ14AH unidirectional or bidirectional, and how is polarity identified?
SMAJ14AH is a unidirectional TVS diode. Polarity is indicated by a cathode band on the DO-214AC (SMA) package body - the banded end connects to system ground during normal operation and conducts surge current from anode to cathode during overvoltage events. Bidirectional versions in this family use CH or CAH suffixes (e.g., SMAJ14CH), which SMAJ14AH does not.
Does SMAJ14AH meet automotive qualification standards?
Yes, SMAJ14AH is AEC-Q101 qualified - confirmed in the FEATURES section of the official datasheet. This qualification covers stress tests including HTGB, HTRB, AC/DC life test, temperature cycling, and mechanical shock, validating its suitability for automotive power distribution, body control, and infotainment systems.
What is the maximum operating temperature for SMAJ14AH?
The SMAJ14AH has a maximum junction temperature (TJ) of +150 °C and an operating junction temperature range of –55 °C to +150 °C - specified in the Absolute Maximum Ratings table. This allows reliable deployment in under-hood automotive locations and thermally dense industrial PCBs without derating below ambient 125 °C.
How does SMAJ14AH compare to SMAJ14H in terms of breakdown voltage and clamping performance?
SMAJ14AH has a tighter VBR range (15.6–17.2 V) versus SMAJ14H (15.6–19.1 V), resulting in more consistent turn-on behavior. Its clamping voltage is 23.2 V at 17.2 A, compared to 25.8 V at 15.5 A for SMAJ14H - indicating superior voltage limiting under equivalent surge conditions due to optimized die design and tighter parameter binning.
SMAJ14AH 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ14AH FAQ
1.How can I place an order for SMAJ14AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ14AH 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 SMAJ14AH reliable?
The price and inventory of SMAJ14AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ14AH is usually 5 days.
3.What payment methods are accepted for SMAJ14AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ14AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ14AH?
SMAJ14AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ14AH 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 SMAJ14AH?
For technical support, including SMAJ14AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ14AH requirements.
6.How does Aetrix verify that SMAJ14AH is sourced from the original manufacturer or authorized distributors?
All SMAJ14AH 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 SMAJ14AH meets industry standards.
7.What is the process for return or replacement of SMAJ14AH?
All SMAJ14AH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ14AH, 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 SMAJ14AH part is unused and in its original packaging.
Return procedure for SMAJ14AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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