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Taiwan Semiconductor Corporation SMAJ54C
- Part No.:
- SMAJ54C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ54C.pdf
- Description:
- 400W, 66.7V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:2,261
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Product details
Overview
SMAJ54C from Taiwan Semiconductor is a unidirectional 54V standoff transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, rated for 400W peak pulse power (10/1000μs), 96.3V maximum clamping voltage at 4.2A impulse current, and operating junction temperature up to +150°C. It protects DC/DC converters, industrial power supplies, and automotive ECUs against ESD and load dump transients.
For engineers reviewing the SMAJ54C datasheet, SMAJ54C pinout, SMAJ54C application, or SMAJ54C equivalent, this page delivers verified electrical parameters, ISO 7637-2 compliance status, clamping performance under standardized surge waveforms, and validated alternative parts for circuit protection redesign.
Technical Context
The SMAJ54C uses a glass-passivated silicon junction optimized for fast transient response (<1.0ps rise time from 0V to VBR min) and low leakage (<1μA at 54V). Its unidirectional configuration provides asymmetric clamping-forward conduction limited to 3.5V at 25A-suited for polarity-sensitive DC rails.
It meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements for automotive electronics and supports steady-state power dissipation of 1W at 25°C with derating above ambient. The device operates across –55°C to +150°C junction temperature range and is rated MSL Level 1 per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 54 V - Maximum continuous reverse working voltage before clamping begins; defines safe DC operating margin. |
| VBR @ IT=1mA | 60.0–73.3 V - Breakdown voltage range at 1mA test current; ensures reliable turn-on during overvoltage events. |
| VC @ IPPM=4.2A | 96.3 V - Clamping voltage at peak impulse current; limits downstream voltage stress during 10/1000μs surge. |
| PPPM | 400 W - Peak pulse power rating (10/1000μs waveform); determines energy-handling capability for transient suppression. |
| IR @ VWM | <1 μA - Reverse leakage at 54V; minimizes standby power loss and avoids false triggering in high-impedance circuits. |
| Junction Temp Range | –55°C to +150°C - Operational thermal envelope; supports under-hood automotive and industrial environments. |
| Package | DO-214AC (SMA) - Surface-mount outline with matte tin-plated leads; compatible with standard reflow profiles and J-STD-002 solderability. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with cathode band marking; dual axial leads, lead-free and RoHS-compliant; weight ≈ 0.060g; UL 94V-0 rated molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference | Connected to lower-potential side of protected line; defines polarity-sensitive clamping direction. |
| Cathode | Clamping output / Surge return path | Connected to higher-potential rail (e.g., VIN); conducts surge current to ground when VAK exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1.0 ps from 0 V to VBR min - Enables suppression of nanosecond-scale ESD and switching spikes before IC damage occurs. |
| ISO 7637-2 compliance | Certified for Pulse 1/2a/2b/3a/3b - Validates robustness against automotive battery transients including load dump and inductive kickback. |
| Glass passivated junction | Stable VBR tolerance and low IR drift over life - Ensures long-term reliability in harsh thermal and humidity environments. |
| MSL Level 1 rating | No floor life limitation; no bake required before SMT assembly - Reduces manufacturing overhead and eliminates moisture-related popcorning risk. |
| Halogen-free construction | Complies with IEC 61249-2-21 - Meets environmental regulations for end-of-life disposal and flame retardancy without brominated compounds. |
Applications
| Automotive Body Control Module | Industrial DC/DC Converter Input |
|---|---|
Use Scenario: Protects microcontroller I/O and CAN transceiver power rails from load dump (Pulse 5a) and jump-start surges in BCMs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery feed and local LDO input; clamps within 1ns to limit VIN to ≤96.3V. Use Value: Prevents latch-up or gate oxide rupture in 3.3V/5V logic ICs during 12V system transients exceeding 60V for >100ms. |
Use Scenario: Shields primary-side controller ICs and MOSFET gates in isolated 48V-to-12V flyback converters used in factory automation. IC Role / Device Role / Timing Role: Mounted across bulk capacitor input; absorbs reflected energy from transformer leakage inductance during switch-off. Use Value: Maintains input voltage below 100V during 400W 10/1000μs surges, avoiding overvoltage shutdown of PWM controllers like UC384x series. |
| LED Driver Power Stage | Telecom PoE Midspan Injector |
Use Scenario: Safeguards constant-current LED driver ICs (e.g., LM3409) from inductive kickback when driving high-power COB arrays. IC Role / Device Role / Timing Role: Placed across MOSFET drain-source; clamps flyback voltage spike during PWM turn-off. Use Value: Limits VDS to 96.3V, enabling use of 100V-rated MOSFETs instead of costlier 150V devices while maintaining SOA margin. |
Use Scenario: Protects IEEE 802.3af/at PD interface controllers on midspan injectors against Ethernet cable ESD and lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Installed on DC input bus prior to DC-DC stage; handles differential-mode transients coupled onto PSE output lines. Use Value: Withstands ±15kV contact ESD (IEC 61000-4-2) and 10/1000μs surges up to 400W without degradation, preserving PD detection integrity. |
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 SMAJ54A | Breakdown voltage 60.0–66.3V (tighter VBR tolerance); clamping voltage 87.1V at 4.6A; same DO-214AC package. | Lower clamping voltage improves margin for 75V-rated downstream components but requires verification of reduced IPPM headroom. | Select SMAJ54A when tighter VBR control and lower VC are prioritized over maximum surge current capacity. |
| ON Semiconductor SMAJ54CA | Bidirectional variant (suffix "CA"); symmetric clamping in both polarities; VBR 60.0–73.3V; VC 96.3V at ±4.2A. | Required for AC-coupled or floating-rail protection where polarity reversal or signal-line ESD is present. | Choose SMAJ54CA only if bidirectional clamping is mandated by circuit topology-unidirectional SMAJ54C offers superior leakage and forward drop in DC applications. |
Compared with SMAJ54A and SMAJ54CA, the SMAJ54C provides optimal balance of clamping voltage, surge current rating, and unidirectional leakage performance for fixed-polarity DC power rails, especially where ISO 7637-2 Pulse 1/2a/2b compliance is mandatory and board space constrains use of larger packages.
Availability
SMAJ54C is available at Aetrix Electronics and suitable for automotive body electronics, industrial DC/DC converter inputs, and LED driver power stages requiring stable component supply, full traceability, and lifecycle continuity support.
Supply support for SMAJ54C 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 MOSFETs since 1979.
The SMAJ series was designed specifically for high-reliability transient suppression in automotive and industrial power systems, emphasizing ISO 7637-2 compliance, MSL Level 1 robustness, and tight parametric consistency across temperature.
FAQ
What is the maximum clamping voltage of SMAJ54C under standard 10/1000μs surge conditions?
The SMAJ54C exhibits a maximum clamping voltage (VC) of 96.3 V when subjected to its rated peak impulse current of 4.2 A using the 10/1000μs waveform. This value is measured per Figure 5 in the official Taiwan Semiconductor datasheet U2102 and defines the upper voltage limit imposed on protected circuitry during transient events.
Is SMAJ54C compliant with automotive transient standards such as ISO 7637-2?
Yes, SMAJ54C is explicitly rated to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements. This certification is confirmed in the "Features" section of the Taiwan Semiconductor datasheet U2102 and validates its suitability for protecting electronic control units in 12V and 24V automotive systems against conducted transients.
Does SMAJ54C have a unidirectional or bidirectional configuration?
SMAJ54C is a unidirectional TVS diode, indicated by the absence of "CA" suffix. Its cathode band marks the terminal that connects to the higher-potential rail, enabling clamping only during reverse overvoltage events-ideal for DC power line protection where polarity is fixed and forward conduction must be minimized.
What is the junction temperature range and thermal derating behavior of SMAJ54C?
SMAJ54C operates across a junction temperature range of –55°C to +150°C. Its peak pulse power rating of 400W is specified at TA = 25°C and derates linearly above that ambient temperature per Figure 2 in the U2102 datasheet, reaching ~200W at +100°C ambient-critical for under-hood or enclosed industrial deployments.
How does the DO-214AC (SMA) package of SMAJ54C compare to SMB or SMC in terms of surge handling?
The DO-214AC (SMA) package of SMAJ54C supports 400W peak pulse power, which is lower than SMB (e.g., SMBJ54C: 600W) and SMC (e.g., SMCJ54C: 1500W) variants. However, SMA offers superior board density and automated placement compatibility-making SMAJ54C ideal where space constraints outweigh extreme surge energy demands.
SMAJ54C 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):
- 54V
- Voltage - Breakdown (Min):
- 60V
- Voltage - Clamping (Max) @ Ipp:
- 96.3V
- Current - Peak Pulse (10/1000µs):
- 4.2A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ54C FAQ
1.How can I place an order for SMAJ54C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ54C 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 SMAJ54C reliable?
The price and inventory of SMAJ54C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ54C is usually 5 days.
3.What payment methods are accepted for SMAJ54C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ54C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ54C?
SMAJ54C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ54C 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 SMAJ54C?
For technical support, including SMAJ54C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ54C requirements.
6.How does Aetrix verify that SMAJ54C is sourced from the original manufacturer or authorized distributors?
All SMAJ54C 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 SMAJ54C meets industry standards.
7.What is the process for return or replacement of SMAJ54C?
All SMAJ54C units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ54C, 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 SMAJ54C part is unused and in its original packaging.
Return procedure for SMAJ54C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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