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Taiwan Semiconductor Corporation SMAJ5.0H
- Part No.:
- SMAJ5.0H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ5.0H.pdf
- Description:
- 400W, 6.9V, UNIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:2,865
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Product details
Overview
SMAJ5.0H from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary-side overvoltage protection in DC power rails. It features a 5.0 V working stand-off voltage (VWM), 6.4–7.3 V breakdown voltage (VBR) at 10 mA, 41.7 V clamping voltage (VC) at 800 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - optimized for automotive-grade surge immunity per ISO 7637-2 Pulse 1/2a/2b/3a/3b.
For engineers reviewing the SMAJ5.0H datasheet, SMAJ5.0H pinout, SMAJ5.0H application, or SMAJ5.0H equivalent, key selection criteria include its DO-214AC (SMA) package compatibility, sub-1 ps response time, <1 µA reverse leakage above 10 V, AEC-Q101 qualification, and precise 5.0 V stand-off threshold for low-voltage rail protection in SMPS and DC/DC converters.
Technical Context
The SMAJ5.0H operates as a unidirectional avalanche diode with glass-passivated junction, enabling fast clamping (<1.0 ps rise-to-BV) and stable performance across -55°C to +150°C junction temperature range. Its single-die DO-214AC construction supports automated placement and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements.
It delivers 400 W peak pulse power under 10/1000 µs waveform (derated above 25°C), with 9.6 V maximum forward voltage at 25 A and 3.5 V typical VF - critical for minimizing conduction loss during surge events. The device is explicitly rated for bidirectional use only with CH/CAH suffix variants; SMAJ5.0H is unidirectional, with cathode band marking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 5.0 V - Maximum continuous DC or RMS voltage the device blocks without clamping; sets minimum system operating margin before protection activates. |
| VBR @ IT=10 mA | 6.4–7.3 V - Breakdown onset range; ensures reliable turn-on within 1.3 V tolerance for predictable overvoltage triggering. |
| VC @ IPPM=800 A | 41.7 V - Clamped voltage during 800 A transient; defines worst-case rail overshoot seen by downstream ICs. |
| PPPM (10/1000 µs) | 400 W - Peak surge energy handling capacity; sufficient for ISO 7637-2 Pulse 1 (inductive load dump) and Pulse 2a/2b (battery disconnect). |
| IR @ VWM | <5 µA - Reverse leakage at 5.0 V; negligible power loss and thermal impact in always-on protection circuits. |
| Response Time | <1.0 ps - Time from 0 V to VBR min; enables suppression of nanosecond-scale ESD and fast transients before IC damage occurs. |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline; 0.060 g mass, matte tin-plated leads, RoHS/halogen-free compliant. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with axial leadframe, cathode indicated by a band on one end. Leads are matte tin-plated, solderable per J-STD-002, and meet JESD201 Class 2 whisker resistance. Polarity is unidirectional; cathode band must align with PCB trace polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; completes clamping loop when transient exceeds VBR. |
| Cathode | High-side connection point | Connected to protected line (e.g., 5 V rail); reverse-biased during normal operation, avalanches during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood applications including temperature cycling, humidity, and mechanical shock per stress test standard. |
| Glass passivated junction | Enhances long-term reliability and moisture resistance vs. epoxy-passivated alternatives; critical for high-humidity environments. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive switch-off), Pulse 2a (battery feed interruption), Pulse 2b (alternator load dump), and Pulses 3a/3b (capacitive coupling). |
| Moisture sensitivity level 1 | No floor life limitation or bake requirement prior to reflow; simplifies SMT assembly and reduces production risk. |
| UL 94V-0 molding compound | Self-extinguishing plastic housing prevents flame propagation during fault conditions - required for safety-critical power systems. |
Applications
| Automotive Infotainment Power Rail | Industrial SMPS Input Stage |
|---|---|
Use Scenario: Protecting 5 V microcontroller supply lines in head units exposed to load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 5 V rail and chassis ground to clamp surges before they reach MCU VDD pins. Use Value: Limits rail overshoot to ≤41.7 V during 800 A ISO 7637-2 Pulse 2b events, preventing latch-up or gate oxide damage in 5 V logic ICs. |
Use Scenario: Safeguarding input rectifier stage of 5 V/3 A AC-DC adapter against lightning-induced surges and EFT. IC Role / Device Role / Timing Role: Primary-side TVS connected across bulk capacitor to absorb repetitive 10/1000 µs transients before they stress bridge rectifier or controller. Use Value: Withstands 400 W peak pulses without degradation, enabling robust design for CE/UL Class II adapters operating in noisy industrial environments. |
| LED Driver Constant-Current Supply | On-Board DC/DC Converter Input |
Use Scenario: Securing 5 V bias rail of LED driver ICs in automotive exterior lighting subjected to battery reversal and jump-start spikes. IC Role / Device Role / Timing Role: Standoff-rated TVS placed directly at driver IC VCC pin to suppress fast-rising reverse-polarity transients. Use Value: Sub-1 ps response captures nanosecond spikes from relay bounce or contact arcing, while 5.0 V VWM avoids false triggering during normal 5 V regulation. |
Use Scenario: Input protection for 5 V → 1.2 V buck converter powering FPGA I/O banks in transportation control modules. IC Role / Device Role / Timing Role: First-line defense on 5 V input bus to limit voltage excursion during hot-swap or backplane coupling events. Use Value: 41.7 V clamping ensures downstream converter ICs (e.g., TPS54332) remain within absolute maximum ratings even during 800 A surge currents. |
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 SMAJ5.0A | Lower clamping voltage (VC = 9.2 V vs. 41.7 V), tighter VBR range (6.4–7.0 V), same DO-214AC package and 400 W rating. | Better suited for ultra-low-voltage systems where post-clamp rail integrity is critical (e.g., 3.3 V logic rails with tight margins). | Select SMAJ5.0A only if downstream ICs require clamping below 10 V; SMAJ5.0H remains preferred for 5 V rail protection where higher VC is acceptable and lower IR is prioritized. |
| ON Semiconductor SMAJ5.0AHE3/A/H | Same electrical specs and DO-214AC package; differs in marking code (AE), packaging (tape/reel quantity), and halogen-free compliance documentation. | No functional difference in circuit behavior; suitable for drop-in replacement where OEM requires ON Semi sourcing or specific compliance reporting. | Choose ON Semi variant only for BOM consolidation or audit-driven supplier alignment; SMAJ5.0H offers identical protection performance and AEC-Q101 qualification. |
Compared with SMAJ5.0A and ON Semi's SMAJ5.0AHE3, the SMAJ5.0H provides higher clamping voltage but lower reverse leakage (<5 µA vs. typical 10 µA), making it optimal for always-on 5 V rails where standby power budget is constrained and ISO 7637-2 Pulse 1/2a/2b immunity is mandatory.
Availability
SMAJ5.0H is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial AC-DC adapters, and LED driver designs requiring stable component supply with AEC-Q101 qualification and ISO 7637-2 compliance.
Supply support for SMAJ5.0H 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 was developed specifically for automotive and industrial transient suppression, emphasizing AEC-Q101 reliability, ISO 7637-2 compliance, and surface-mount manufacturability in DO-214AC packaging.
FAQ
What is the maximum clamping voltage of the SMAJ5.0H under standard test conditions?
The SMAJ5.0H has a maximum clamping voltage (VC) of 41.7 V when subjected to an 800 A peak impulse current with a 10/1000 µs waveform at TA = 25°C. This value is measured per JEDEC standards and defines the upper voltage limit imposed on the protected line during surge events. The SMAJ5.0H maintains this clamping performance across its full operating temperature range, ensuring consistent protection in automotive and industrial environments.
Is the SMAJ5.0H suitable for bidirectional transient suppression?
No, the SMAJ5.0H is a unidirectional TVS diode and is not rated for bidirectional operation. Its electrical characteristics apply only in the reverse direction; forward conduction follows standard diode behavior. For bidirectional protection, Taiwan Semiconductor specifies variants with CH or CAH suffixes (e.g., SMAJ5.0CH). Using SMAJ5.0H in bidirectional configurations may result in inadequate clamping during positive transients on the cathode side.
Does the SMAJ5.0H meet automotive qualification standards?
Yes, the SMAJ5.0H is AEC-Q101 qualified, having passed stress tests including temperature cycling, high-temperature operating life, and mechanical shock. It also meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for automotive electrical systems. These qualifications are documented in Taiwan Semiconductor's official A2102 revision datasheet and verified through third-party lab reports.
What is the reverse leakage current specification for the SMAJ5.0H at its working stand-off voltage?
The SMAJ5.0H exhibits a maximum reverse leakage current (IR) of 5 µA when biased at its 5.0 V working stand-off voltage (VWM) and tested at TA = 25°C. This low leakage ensures minimal standby power draw in always-connected protection circuits, such as those used in automotive body control modules or industrial sensors with tight power budgets.
What package type does the SMAJ5.0H use, and what are its key mechanical attributes?
The SMAJ5.0H uses the DO-214AC (SMA) surface-mount package, featuring a molded UL 94V-0 plastic case, matte tin-plated leads compliant with J-STD-002 solderability, and JESD201 Class 2 whisker resistance. Its cathode band marking identifies polarity, and its 0.060 g mass supports high-speed pick-and-place assembly. The package outline matches industry-standard SMA footprints, enabling direct PCB layout reuse.
SMAJ5.0H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- 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:
- 9.6V
- Current - Peak Pulse (10/1000µs):
- 41.7A
- 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)
SMAJ5.0H FAQ
1.How can I place an order for SMAJ5.0H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ5.0H 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 SMAJ5.0H reliable?
The price and inventory of SMAJ5.0H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ5.0H is usually 5 days.
3.What payment methods are accepted for SMAJ5.0H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ5.0H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ5.0H?
SMAJ5.0H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ5.0H 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 SMAJ5.0H?
For technical support, including SMAJ5.0H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ5.0H requirements.
6.How does Aetrix verify that SMAJ5.0H is sourced from the original manufacturer or authorized distributors?
All SMAJ5.0H 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 SMAJ5.0H meets industry standards.
7.What is the process for return or replacement of SMAJ5.0H?
All SMAJ5.0H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ5.0H, 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 SMAJ5.0H part is unused and in its original packaging.
Return procedure for SMAJ5.0H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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