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Taiwan Semiconductor Corporation SMAJ5.0AH
- Part No.:
- SMAJ5.0AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ5.0AH.pdf
- Description:
- 400W, 6.7V, 5%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:4,974
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Product details
Overview
SMAJ5.0AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power rails. It features a 5.0 V working stand-off voltage (VWM), 6.4–7.0 V breakdown voltage (VBR), 43.5 V clamping voltage (VC) at 800 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive-grade SMPS, on-board DC/DC converters, and lighting drivers.
For engineers reviewing the SMAJ5.0AH datasheet, SMAJ5.0AH pinout, SMAJ5.0AH application, or SMAJ5.0AH equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b stress, AEC-Q101 qualification status, DO-214AC (SMA) package compatibility, and leakage current ≤5 µA at 10 V reverse bias.
Technical Context
The SMAJ5.0AH operates as a unidirectional avalanche diode with glass-passivated junction, enabling fast response (<1.0 ps from 0 V to VBR min) and stable clamping during transient events. Its 150 °C maximum junction temperature and -55 °C to +150 °C operating range support under-hood and industrial environments.
Designed for single-die configuration in DO-214AC (SMA) package, it delivers 400 W peak pulse power at TA = 25 °C (derated above), with 1 W steady-state power dissipation and 40 A peak forward surge current (8.3 ms half-sine). Polarity is marked by cathode band per JEDEC standard.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 10 V - maximum continuous reverse operating voltage before significant leakage |
| VBR min/max | 6.4 V / 7.0 V at 10 mA test current - defines reliable avalanche initiation threshold |
| VC @ IPPM | 43.5 V at 800 A - clamped voltage during 10/1000 µs surge, limiting downstream IC stress |
| IR @ VWM | ≤5 µA - ensures minimal standby power loss in low-power systems |
| PPPM | 400 W (10/1000 µs) - peak energy absorption capability for automotive load dump immunity |
| TJ max | +150 °C - enables operation in high-ambient under-hood or enclosed power supply environments |
| Package | DO-214AC (SMA) - industry-standard surface-mount outline with 0.060 g mass and J-STD-002 solderability |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case rated UL 94V-0, matte tin-plated leads, polarity indicated by cathode band. Weight: 0.060 g. Moisture sensitivity level: J-STD-020 Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or lower-potential rail in unidirectional clamp configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 5 V rail); conducts during overvoltage to shunt surge to ground |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including temperature cycling, HTRB, and ESD |
| Glass passivated junction | Enhances long-term reliability and stability of breakdown voltage under thermal and humidity stress |
| Clamping ratio VC/VBR | ~6.2 - low ratio indicates efficient voltage limiting with minimal overshoot during transients |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
Applications
| Automotive Power Supply Protection | Industrial DC/DC Converter Input |
|---|---|
Use Scenario: Protecting 5 V microcontroller power rail against load dump and alternator ripple in body control modules. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between 5 V rail and chassis ground to clamp surges exceeding 10 V. Use Value: Limits transient voltage to ≤43.5 V during 800 A 10/1000 µs pulses, preventing latch-up or damage to downstream logic ICs. | Use Scenario: Safeguarding input stage of isolated 5 V-to-3.3 V DC/DC converter in programmable logic controllers. IC Role / Device Role / Timing Role: Primary overvoltage clamp on primary-side 5 V bus, coordinated with upstream fuse and common-mode choke. Use Value: Withstands repetitive ISO 7637-2 Pulse 3b events while maintaining <5 µA leakage, preserving efficiency in always-on systems. |
| LED Driver Overvoltage Clamp | USB-C Power Delivery Interface |
Use Scenario: Suppressing inductive kickback from LED string switching in automotive headlamp modules. IC Role / Device Role / Timing Role: Fast-response TVS across LED driver output to absorb flyback energy from MOSFET turn-off. Use Value: Sub-1 ps response time ensures clamping initiates before sensitive driver ICs experience overvoltage stress. | Use Scenario: Secondary-level surge protection on VBUS line of USB-C receptacle in automotive infotainment head units. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to system ground, placed after EMI filter but before PD controller. Use Value: 43.5 V clamping voltage aligns with USB PD 3.0 VBUS tolerance (up to 20 V nominal, 28 V max), avoiding false fault triggering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ5.0H | VBR max = 7.30 V (vs. 7.00 V for SMAJ5.0AH); higher clamping voltage (41.7 V vs. 43.5 V) | Same DO-214AC package and AEC-Q101 qualification; slightly looser VBR tolerance | Select SMAJ5.0H where tighter clamping consistency is not required and cost optimization is prioritized |
| SMBJ5.0A | DO-214AA (SMB) package; 600 W peak power; VBR 6.4–7.0 V; VC = 43.5 V at 1000 A | Higher surge rating but larger footprint; not drop-in compatible due to different pad layout and thermal mass | Choose SMBJ5.0A only when 600 W rating is mandatory and PCB layout allows SMB package rework |
Compared with SMAJ5.0H and SMBJ5.0A, the SMAJ5.0AH offers tighter VBR tolerance (6.4–7.0 V), optimized for designs requiring predictable clamping onset, while retaining full AEC-Q101 compliance and DO-214AC mountability without layout change.
Availability
SMAJ5.0AH is available at Aetrix Electronics and suitable for automotive power supply protection, industrial DC/DC converter input stages, and LED driver overvoltage clamp circuits requiring stable component supply, AEC-Q101 traceability, and consistent 400 W surge handling.
Supply support for SMAJ5.0AH 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, MOSFETs, and power management devices.
The SMAJ series is engineered for robust transient suppression in automotive and industrial power systems, emphasizing AEC-Q101 reliability, ISO 7637-2 compliance, and surface-mount manufacturability in DO-214AC packaging.
FAQ
What is the clamping voltage of SMAJ5.0AH under a 10/1000 µs surge?
The SMAJ5.0AH has a maximum clamping voltage (VC) of 43.5 V at 800 A peak impulse current with a 10/1000 µs waveform. This value is measured per Fig.5 in the official datasheet and defines the upper voltage limit imposed on protected circuitry during standardized surge events.
Is SMAJ5.0AH qualified for automotive applications?
Yes, SMAJ5.0AH is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements. Its construction includes glass-passivated junction, JESD201 Class 2 whisker resistance, and moisture sensitivity level 1 - all verified for automotive under-hood and module-level deployment.
What is the difference between SMAJ5.0AH and SMAJ5.0H?
SMAJ5.0AH specifies a tighter breakdown voltage range (6.4–7.0 V) versus SMAJ5.0H (6.4–7.3 V), resulting in more consistent clamping onset. SMAJ5.0AH also exhibits a slightly higher clamping voltage (43.5 V vs. 41.7 V at 800 A), reflecting its tighter VBR distribution and optimized junction design.
Does SMAJ5.0AH support bidirectional transient suppression?
No, SMAJ5.0AH is a unidirectional TVS diode. For bidirectional operation, Taiwan Semiconductor offers SMAJ5.0CH or SMAJ5.0CAH variants with CH/CAH suffixes. The "H" suffix alone denotes unidirectional configuration with cathode band marking.
What is the maximum operating junction temperature for SMAJ5.0AH?
The SMAJ5.0AH has a maximum junction temperature (TJ max) of +150 °C, validated per absolute maximum ratings table. This allows reliable operation in high-ambient environments such as engine control units, DC/DC converters, and LED drivers where thermal management is constrained.
SMAJ5.0AH 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):
- 5V
- Voltage - Breakdown (Min):
- 6.4V
- Voltage - Clamping (Max) @ Ipp:
- 9.2V
- Current - Peak Pulse (10/1000µs):
- 43.5A
- 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)
SMAJ5.0AH FAQ
1.How can I place an order for SMAJ5.0AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ5.0AH 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 SMAJ5.0AH reliable?
The price and inventory of SMAJ5.0AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ5.0AH is usually 5 days.
3.What payment methods are accepted for SMAJ5.0AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ5.0AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ5.0AH?
SMAJ5.0AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ5.0AH 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 SMAJ5.0AH?
For technical support, including SMAJ5.0AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ5.0AH requirements.
6.How does Aetrix verify that SMAJ5.0AH is sourced from the original manufacturer or authorized distributors?
All SMAJ5.0AH 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 SMAJ5.0AH meets industry standards.
7.What is the process for return or replacement of SMAJ5.0AH?
All SMAJ5.0AH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ5.0AH, 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 SMAJ5.0AH part is unused and in its original packaging.
Return procedure for SMAJ5.0AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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