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Taiwan Semiconductor Corporation SMAJ54CH
- Part No.:
- SMAJ54CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ54CH.pdf
- Description:
- TVS DIODE 54VWM 96.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,861
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Product details
Overview
SMAJ54CH from Taiwan Semiconductor is a unidirectional 54V standoff, 60V minimum breakdown, 96.3V clamping voltage transient voltage suppressor (TVS) in DO-214AC (SMA) package, rated for 400W peak pulse power (10/1000μs), AEC-Q101 qualified, and designed for automotive and industrial DC/DC converter protection.
For engineers reviewing the SMAJ54CH datasheet, SMAJ54CH pinout, SMAJ54CH application, or SMAJ54CH equivalent, key selection criteria include clamping voltage under 97V at 4.2A peak impulse current, working voltage stability up to 54V, bidirectional capability confirmation (CH suffix denotes bidirectional), and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive transients.
Technical Context
The SMAJ54CH employs a glass-passivated silicon junction optimized for fast response (<1.0ps from 0V to VBR min) and low leakage (<1μA at 54V). Its bidirectional configuration enables symmetric transient suppression across both polarities without external polarity management.
It operates within -55°C to +150°C junction temperature range, supports 40A non-repetitive forward surge (8.3ms half-sine), and maintains clamping performance under derated conditions per Fig.2 - critical for under-hood automotive environments where ambient temperatures exceed 100°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 54 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC bias margin in protected line. |
| VBR @ IT=1mA | 60.0–73.3 V - Breakdown voltage range at 1mA test current; ensures reliable triggering above normal operating voltage. |
| VC @ IPPM=4.2A | 96.3 V - Clamping voltage at 4.2A peak impulse (10/1000μs); limits downstream component stress during ESD/EFT events. |
| PPPM | 400 W - Peak pulse power rating (10/1000μs waveform); sustains high-energy transients without failure. |
| IR @ VWM | <1 μA - Reverse leakage at 54V; minimizes standby power loss and avoids false triggering in low-power systems. |
| TJ max | +150 °C - Maximum junction temperature; enables placement near heat sources in engine control units and power converters. |
Pinout & Package
DO-214AC (SMA) surface-mount package: molded epoxy case meeting UL 94V-0, matte tin-plated leads compliant with J-STD-002 solderability, polarity marked by cathode band (unidirectional interpretation applies only to H-suffix variants; CH denotes bidirectional - no cathode marking required).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (Bidirectional) | Transient conduction path | Identical electrical behavior in both directions; connects across protected line (e.g., CAN_H–CAN_L or supply–return) without polarity sensitivity. |
| Case | Mechanical mounting / thermal path | No internal electrical connection; provides mechanical stability and limited thermal dissipation to PCB copper. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock - required for powertrain and body electronics. |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Guarantees immunity to real-world automotive load dump, inductive switching, and battery disconnect transients per international standard. |
| Moisture Sensitivity Level 1 (J-STD-020) | Zero floor life limitation - can be stored indefinitely and placed directly into reflow without baking. |
| Halogen-free & RoHS-compliant | Meets IEC 61249-2-21 and EU RoHS Directive - supports green manufacturing and end-of-life recycling requirements. |
Applications
| Automotive Power Distribution | Industrial DC/DC Converters |
|---|---|
Use Scenario: Protection of 12V/24V power rails in engine control modules against load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS device placed across input terminals to clamp transients before they reach regulator ICs and microcontrollers. Use Value: Limits voltage excursion to ≤96.3V during 400W pulses, preventing latch-up or overvoltage damage to downstream PMICs and CAN transceivers. | Use Scenario: Input-side surge suppression in isolated 48V-to-12V DC/DC converters used in factory automation controllers. IC Role / Device Role / Timing Role: Primary-line transient absorber positioned upstream of active rectification stage to protect MOSFET gate drivers and feedback optocouplers. Use Value: Withstands 4.2A peak impulse at 54V working voltage while maintaining <1μA leakage - preserves efficiency and avoids false trips during steady-state operation. |
| On-Board Charger Interfaces | LED Driver Power Inputs |
Use Scenario: Transient protection on AC/DC adapter output lines feeding vehicle on-board chargers (OBC) with CAN communication interfaces. IC Role / Device Role / Timing Role: Bidirectional clamping element across CAN bus lines (CAN_H/CAN_L) and auxiliary 12V supply to absorb coupled noise from power switching. Use Value: Fast <1.0ps response ensures clamping initiates before sensitive CAN PHY ICs experience overvoltage - critical for error-free communication during EFT bursts. | Use Scenario: Input protection for constant-current LED drivers in streetlighting systems exposed to lightning-induced surges on 230VAC-derived DC rails. IC Role / Device Role / Timing Role: Secondary-stage TVS after bulk rectification and before buck controller IC to limit voltage spikes from line transients. Use Value: 96.3V clamping at 4.2A prevents overvoltage stress on driver ICs rated for 100V absolute maximum - extends field lifetime in outdoor deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ54CA | Same DO-214AC package, identical VWM/VC specs (54V/96.3V), but rated for 300W above 78V - full 400W rating confirmed only to 78V; IR = 1μA @ VWM. | Validated for ISO 7637-2 Pulse 1/2a/2b/3a/3b, but AEC-Q101 qualification not explicitly stated in public datasheet. | Select when cost or lead time favors Littelfuse, and AEC-Q101 is not contractually mandated. |
| ON Semiconductor 1.5SMC54CA | Higher package thermal resistance (DO-214AB vs DO-214AC), larger footprint, 1500W peak power rating but lower clamping ratio (VC/VBR ≈ 1.65 vs 1.60 for SMAJ54CH); VC = 93.6V @ 16.6A. | Designed for higher-energy transients but less suitable for space-constrained automotive PCBs due to larger SMC package. | Choose for industrial applications requiring higher single-pulse energy handling and where board area permits larger SMC outline. |
Compared with SMAJ54CH, SMAJ54CA offers identical electrical specs but lacks published AEC-Q101 evidence, while 1.5SMC54CA delivers higher pulse energy tolerance at the cost of board space and thermal performance - making SMAJ54CH optimal for AEC-Q101–mandated, space-limited automotive DC/DC inputs.
Availability
SMAJ54CH is available at Aetrix Electronics and suitable for automotive power distribution, industrial DC/DC converters, and on-board charger interfaces requiring stable component supply, AEC-Q101 assurance, and ISO 7637-2 compliance.
Supply support for SMAJ54CH 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, serving global automotive, industrial, and consumer markets since 1979.
The SMAJ series is part of TSC's AEC-Q101–qualified TVS portfolio engineered specifically for robust transient immunity in harsh automotive environments - emphasizing fast response, low leakage, and standardized ISO 7637-2 pulse survivability.
FAQ
Is SMAJ54CH unidirectional or bidirectional?
SMAJ54CH is a bidirectional TVS diode. The "CH" suffix explicitly denotes bidirectional configuration per Taiwan Semiconductor's ordering nomenclature - meaning it provides symmetrical clamping for both positive and negative transients without polarity dependence. This differs from "H"-suffix variants (e.g., SMAJ54H), which are unidirectional and require correct anode/cathode orientation.
What is the clamping voltage of SMAJ54CH at its rated peak pulse current?
The clamping voltage of SMAJ54CH is 96.3 V measured at 4.2 A peak impulse current using the standard 10/1000μs waveform. This value is specified in the Electrical Specifications table on page 3 of the official Taiwan Semiconductor datasheet (Version A2102) and represents the maximum voltage seen across the device during transient suppression.
Does SMAJ54CH meet AEC-Q101 reliability standards?
Yes, SMAJ54CH is explicitly AEC-Q101 qualified. This is stated in the FEATURES section of the datasheet and confirmed in the Mechanical Data and Ordering Information pages. AEC-Q101 validation covers stress tests including temperature cycling, high-temperature operating life, and ESD - essential for automotive under-hood deployment.
Can SMAJ54CH be used in place of SMAJ54AH?
No - SMAJ54CH and SMAJ54AH are functionally distinct. SMAJ54AH is a unidirectional device with 66.3V max VBR and 87.1V VC, while SMAJ54CH is bidirectional with 73.3V max VBR and 96.3V VC. Substituting one for the other risks incorrect polarity handling or inadequate clamping margin. Always verify directionality and exact parameter values before replacement.
What packaging and reel quantity does SMAJ54CH ship in?
SMAJ54CH ships in DO-214AC (SMA) package on tape-and-reel format with 7,500 units per reel, as specified in the Ordering Information section of the Taiwan Semiconductor datasheet. The tape meets EIA-481 standards and is compatible with standard SMT pick-and-place equipment.
SMAJ54CH 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ54CH FAQ
1.How can I place an order for SMAJ54CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ54CH 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 SMAJ54CH reliable?
The price and inventory of SMAJ54CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ54CH is usually 5 days.
3.What payment methods are accepted for SMAJ54CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ54CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ54CH?
SMAJ54CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ54CH 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 SMAJ54CH?
For technical support, including SMAJ54CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ54CH requirements.
6.How does Aetrix verify that SMAJ54CH is sourced from the original manufacturer or authorized distributors?
All SMAJ54CH 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 SMAJ54CH meets industry standards.
7.What is the process for return or replacement of SMAJ54CH?
All SMAJ54CH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ54CH, 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 SMAJ54CH part is unused and in its original packaging.
Return procedure for SMAJ54CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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