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Taiwan Semiconductor Corporation SMAJ54CAH
- Part No.:
- SMAJ54CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ54CAH.pdf
- Description:
- TVS DIODE 54VWM 87.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,056
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Product details
Overview
SMAJ54CAH from Taiwan Semiconductor is a bidirectional 54V standoff transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, rated for 400W peak pulse power (10/1000μs), clamping to ≤87.1V at 4.6A, and qualified to AEC-Q101 for automotive-grade surge protection in DC/DC converters and power supplies.
For engineers reviewing the SMAJ54CAH datasheet, SMAJ54CAH pinout, SMAJ54CAH application, or SMAJ54CAH equivalent, key selection criteria include bidirectional clamping performance at 54V working voltage, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, moisture sensitivity level 1 handling, and RoHS/halogen-free construction for automotive and industrial PCB designs.
Technical Context
The SMAJ54CAH implements 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 bidirectional configuration enables symmetric clamping in AC-coupled or floating rail applications without polarity constraints.
Designed for 150°C maximum junction temperature operation and rated for 40A non-repetitive forward surge (8.3ms half-sine), it supports robust overvoltage protection in switching mode power supplies and on-board DC/DC converters subject to load dump, inductive switching, and ESD events per IEC 61000-4-2/4-4/4-5.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 54 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR @ IT=1mA | 60.0–66.3 V - Verified breakdown threshold ensuring reliable turn-on during transients |
| VC @ IPPM=4.6A | ≤87.1 V - Clamped voltage under 10/1000μs surge, limiting downstream IC stress |
| PPPM | 400 W - Peak pulse power handling capability with standard 10/1000μs waveform |
| IR @ VWM | ≤1 μA - Ultra-low leakage preserves system efficiency in high-impedance bias networks |
| Package | DO-214AC (SMA) - Surface-mount outline with 0.060g mass, J-STD-002 solderable matte tin leads |
| AEC-Q101 | Qualified - Validated for automotive electronics per stress test requirements including temperature cycling and HTRB |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case meeting UL 94V-0 flammability rating; cathode band denotes polarity for unidirectional variants - SMAJ54CAH is bidirectional and marked with "RE" code; terminals are matte tin-plated, JESD 201 Class 2 whisker compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient conduction path | No polarity dependency - either terminal serves as input/output for surge current in either direction |
| Case | Thermal and mechanical mounting surface | Non-electrical; provides thermal path to PCB copper and mechanical stability during reflow |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables use in AC signal lines or floating rails without orientation constraints or external diode pairing |
| AEC-Q101 qualification | Validates reliability for automotive under-hood and infotainment systems requiring extended temperature and life-cycle validation |
| ISO 7637-2 compliance | Meets automotive electrical disturbance standards for Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) |
| Moisture sensitivity level 1 | Eliminates bake preconditioning prior to SMT assembly - compatible with standard J-STD-020 reflow profiles |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally constrained supply chains |
Applications
| Automotive DC/DC Converters | Industrial SMPS Inputs |
|---|---|
Use Scenario: Protection of 12V/24V automotive DC/DC converter inputs against load dump (ISO 7637-2 Pulse 5a/b) and alternator transients. IC Role / Device Role / Timing Role: Primary bidirectional TVS clamp placed upstream of input filter and controller IC. Use Value: Limits voltage to ≤87.1V during 400W surges, preventing damage to buck controller, gate drivers, and sensing circuitry. |
Use Scenario: Input-side surge suppression in industrial 48V SMPS front-ends exposed to lightning-induced surges and switching noise. IC Role / Device Role / Timing Role: Standoff protector across bulk input capacitors, activated within <1.0ps of overvoltage onset. Use Value: Maintains ≤1μA leakage at 54V, avoiding standby power loss while delivering 400W pulse immunity per IEC 61000-4-5. |
| LED Driver Power Rails | On-Board Battery Management |
Use Scenario: Transient protection for constant-current LED driver ICs in vehicle lighting modules subjected to ESD and cable discharge events. IC Role / Device Role / Timing Role: Secondary-level clamp between input rail and driver IC VDD, sized for localized energy absorption. Use Value: Clamps ESD pulses to <87.1V within picoseconds, preserving driver IC integrity without adding series impedance or delay. |
Use Scenario: Voltage rail protection in battery management systems (BMS) for 48V mild-hybrid architectures during cell balancing and hot-plug events. IC Role / Device Role / Timing Role: Bidirectional clamp across BMS analog front-end supply rails to suppress coupled transients from switching FETs. Use Value: Operates reliably from −55°C to +150°C junction temperature, supporting full automotive thermal envelope without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ54CA | Same DO-214AC package, identical VWM/VC specs, but not AEC-Q101 qualified | Lacks automotive qualification - suitable for industrial/commercial only | Select when AEC-Q101 is not required and cost optimization is prioritized |
| ON Semiconductor 1.5SMC54CA | Higher PPPM = 1500W, larger DO-214AB (SMB) package, VC = 87.1V same | Requires PCB layout change; better for higher-energy transients where space allows | Choose when surge energy exceeds 400W and board real estate permits SMB footprint |
Compared with SMAJ54CAH, Littelfuse SMAJ54CA offers identical electrical performance but no automotive qualification, while ON Semi 1.5SMC54CA delivers triple the pulse power in a larger package - making SMAJ54CAH optimal for space-constrained AEC-Q101-compliant designs needing precise 400W/54V protection.
Availability
SMAJ54CAH is available at Aetrix Electronics and suitable for automotive DC/DC converters, industrial SMPS inputs, and LED driver power rails requiring stable component supply with full traceability and lifecycle support.
Supply support for SMAJ54CAH 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, and rectifiers with global distribution and AEC-Q101 validation capabilities.
The SMAJ series was developed specifically for automotive and industrial transient suppression, emphasizing AEC-Q101 reliability, ISO 7637-2 compliance, and surface-mount compatibility in compact DO-214AC packaging.
FAQ
What does the "CAH" suffix indicate in SMAJ54CAH?
The "CAH" suffix in SMAJ54CAH denotes a bidirectional configuration ("C") with tightened breakdown voltage tolerance ("A") and halogen-free construction ("H"). Unlike unidirectional "AH" variants, SMAJ54CAH provides symmetrical clamping in both polarities - critical for AC-coupled or floating-rail protection without polarity-sensitive placement.
Is SMAJ54CAH qualified for automotive applications?
Yes, SMAJ54CAH is AEC-Q101 qualified per the official Taiwan Semiconductor datasheet (Version A2102). This certification covers temperature cycling, high-temperature reverse bias, and humidity testing - validating its suitability for under-hood and infotainment systems where reliability across −40°C to +125°C ambient is mandatory.
What is the maximum clamping voltage of SMAJ54CAH under surge conditions?
The maximum clamping voltage of SMAJ54CAH is 87.1 V at a peak pulse current (IPPM) of 4.6 A with a 10/1000μs waveform. This value is guaranteed per the datasheet's Electrical Specifications table and ensures downstream components see voltage limited well below destructive thresholds during standardized surge events.
Does SMAJ54CAH meet ISO 7637-2 requirements?
Yes, SMAJ54CAH meets ISO 7637-2 for automotive transient immunity, explicitly covering Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling). This compliance is stated in the Features section and validated through device-level testing per the standard's waveform definitions.
What is the moisture sensitivity level (MSL) of SMAJ54CAH?
SMAJ54CAH has a moisture sensitivity level (MSL) of 1 per J-STD-020, meaning it can be stored indefinitely at ≤30°C/60% RH and requires no baking prior to reflow soldering. This simplifies manufacturing logistics and eliminates yield risk from popcorning during standard lead-free reflow profiles.
SMAJ54CAH 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:
- 87.1V
- Current - Peak Pulse (10/1000µs):
- 4.6A
- 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)
SMAJ54CAH FAQ
1.How can I place an order for SMAJ54CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ54CAH 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 SMAJ54CAH reliable?
The price and inventory of SMAJ54CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ54CAH is usually 5 days.
3.What payment methods are accepted for SMAJ54CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ54CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ54CAH?
SMAJ54CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ54CAH 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 SMAJ54CAH?
For technical support, including SMAJ54CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ54CAH requirements.
6.How does Aetrix verify that SMAJ54CAH is sourced from the original manufacturer or authorized distributors?
All SMAJ54CAH 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 SMAJ54CAH meets industry standards.
7.What is the process for return or replacement of SMAJ54CAH?
All SMAJ54CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ54CAH, 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 SMAJ54CAH part is unused and in its original packaging.
Return procedure for SMAJ54CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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