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Taiwan Semiconductor Corporation SMAJ54AH
- Part No.:
- SMAJ54AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ54AH.pdf
- Description:
- TVS DIODE 54VWM 87.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,074
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Product details
Overview
SMAJ54AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for robust overvoltage protection in automotive and industrial DC power rails. It features a 54 V working stand-off voltage (VWM), 60.0–66.3 V breakdown voltage (VBR), 87.1 V clamping voltage (VC) at 4.6 A peak impulse current, and 400 W peak pulse power (10/1000 µs waveform).
For engineers reviewing the SMAJ54AH datasheet, SMAJ54AH pinout, SMAJ54AH application, or SMAJ54AH equivalent, this device is selected for high-reliability 12 V/24 V automotive subsystems, on-board DC/DC converters, and switching mode power supplies where fast response (<1.0 ps), low leakage (<1 µA @ 54 V), and AEC-Q101 qualification are critical.
Technical Context
The SMAJ54AH operates as a unidirectional avalanche diode with glass-passivated junction, enabling sub-nanosecond response to transients while maintaining stable clamping under ISO 7637-2 Pulse 1/2a/2b/3a/3b stress. Its single-die DO-214AC construction supports automated placement and meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity.
It delivers 400 W peak pulse power at TA = 25°C (derated above ambient), with maximum junction temperature of +150°C and operating range from –55°C to +150°C. The device exhibits <1 µA reverse leakage at VWM and clamps to ≤87.1 V at 4.6 A IPPM - critical for protecting downstream MOSFETs and controllers in 48 V nominal systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 54 V - Maximum continuous reverse operating voltage before conduction begins; sets system rail margin for 48 V automotive applications. |
| VBR min/max | 60.0 / 66.3 V @ 1 mA - Confirmed breakdown threshold ensures reliable triggering above normal operating voltage with tight tolerance. |
| VC @ IPPM | 87.1 V @ 4.6 A - Clamping voltage during 10/1000 µs surge defines maximum stress imposed on protected ICs. |
| PPPM | 400 W (10/1000 µs) - Peak surge energy handling capacity compatible with ISO 7637-2 Pulse 5a requirements. |
| IR @ VWM | <1 µA - Ultra-low leakage preserves efficiency in always-on circuits and avoids false triggering. |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline with cathode band marking and 0.060 g mass. |
| TJ max | +150 °C - Enables deployment in under-hood automotive environments without thermal derating penalties. |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case with matte tin-plated leads, polarity indicated by cathode band. Lead finish complies with J-STD-002 solderability; weight ≈ 0.060 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or lower-potential node; conducts during forward surge events (e.g., reverse battery). |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 48 V rail); avalanches into conduction when transient exceeds VBR to shunt energy to ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per JESD47 - enables use in ADAS and body control modules. |
| Clamping voltage ≤87.1 V | Ensures protected 48 V logic-level MOSFETs (e.g., VGS(max) = 100 V) remain within safe operating area during load dump. |
| Response time <1.0 ps | Fast enough to suppress ESD and fast-switching noise before sensitive analog or digital inputs are damaged. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive - supports green manufacturing and export compliance. |
| ISO 7637-2 compliant | Meets Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) - certified for 12 V/24 V vehicle networks. |
Applications
| Automotive Body Control Module | Industrial 48 V DC/DC Converter |
|---|---|
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O against load dump and jump-start surges in door module ECUs. IC Role / Device Role: Unidirectional TVS placed between LIN line and ground to clamp transients up to ±100 V. Use Value: Prevents latch-up or permanent damage to 5 V tolerant transceivers (e.g., TJA1020) during ISO 7637-2 Pulse 5a events. |
Use Scenario: Safeguarding primary-side gate drivers and feedback optocouplers in isolated 48 V → 12 V flyback converters. IC Role / Device Role: Mounted across input bulk capacitor to absorb switch-node ringing and input line surges. Use Value: Limits voltage overshoot to ≤87.1 V, preserving 100 V-rated Si MOSFETs and avoiding secondary-side regulation disruption. |
| LED Headlamp Driver | Telecom Power Interface |
Use Scenario: Shielding constant-current LED driver ICs from alternator ripple and ignition coil coupling in adaptive front lighting systems. IC Role / Device Role: Placed on 48 V supply rail upstream of buck controller to suppress repetitive 100 V/50 ms pulses. Use Value: Maintains <1 µA leakage to avoid standby current penalty while clamping 400 W surges without thermal runaway. |
Use Scenario: Front-end protection for PoE-powered remote radio units exposed to induced lightning surges on 48 V DC feed lines. IC Role / Device Role: First-stage TVS on DC input before DC/DC converter and Ethernet PHY. Use Value: Withstands 4.6 A 10/1000 µs impulses per IEC 61000-4-5 Level 3, reducing need for multi-stage protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ54A | Same VWM (54 V), but VBR min/max = 60.0–73.3 V and VC = 96.3 V @ 4.2 A - wider VBR tolerance and higher clamping. | Less precise clamping; suitable where tighter voltage margin is not required. | Select SMAJ54A only if design tolerates ≥96.3 V transient exposure and lower cost is prioritized over clamping performance. |
| SMBJ54A | Same electrical specs but in larger DO-214AA (SMB) package - 1.5× higher thermal mass and 600 W PPPM rating. | Preferred for high-temperature or high-cycle-count environments where PCB space allows. | Choose SMBJ54A when board layout permits larger footprint and enhanced surge endurance beyond 400 W is needed. |
Compared with SMAJ54A, the SMAJ54AH offers tighter VBR (60.0–66.3 V vs. 60.0–73.3 V) and lower clamping (87.1 V vs. 96.3 V), improving protection margin for 48 V systems; versus SMBJ54A, it trades surge rating for compact DO-214AC size - optimal for space-constrained automotive modules.
Availability
SMAJ54AH is available at Aetrix Electronics and suitable for automotive body electronics, industrial 48 V DC/DC converters, and LED lighting systems requiring stable component supply with AEC-Q101 assurance and full traceability.
Supply support for SMAJ54AH 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 developed specifically for AEC-Q101-compliant automotive transient suppression, targeting ISO 7637-2 and ISO 16750-2 compliance in engine control, lighting, and infotainment systems.
FAQ
What is the clamping voltage of SMAJ54AH and how is it measured?
The SMAJ54AH has a maximum clamping voltage (VC) of 87.1 V at 4.6 A peak impulse current, tested using the standardized 10/1000 µs double-exponential waveform per IEC 61000-4-5. This value represents the upper limit of voltage seen by downstream components during a surge event and is guaranteed across temperature and production lots per Taiwan Semiconductor's AEC-Q101 qualification.
Is SMAJ54AH suitable for bidirectional transient protection?
No, SMAJ54AH is a unidirectional TVS diode intended for DC line protection with defined polarity - the cathode must be connected to the protected line and anode to ground. For bidirectional applications such as AC lines or data buses, Taiwan Semiconductor specifies SMAJ54CH or SMAJ54CAH variants, which feature symmetrical breakdown in both directions.
Does SMAJ54AH meet automotive qualification standards?
Yes, SMAJ54AH is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements. Its DO-214AC package also satisfies JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity - all documented in Taiwan Semiconductor's A2102 datasheet revision.
What is the maximum steady-state power dissipation for SMAJ54AH?
The SMAJ54AH has a steady-state power dissipation (PD) rating of 1 W at TA = 25°C, as specified in its Absolute Maximum Ratings table. This value applies to continuous DC reverse bias conditions and does not reflect its 400 W peak pulse capability - thermal design must ensure junction temperature remains ≤150°C under worst-case ambient and power loss conditions.
How does SMAJ54AH differ from SMAJ54H?
SMAJ54AH features tighter breakdown voltage tolerance (60.0–66.3 V) versus SMAJ54H (60.0–73.3 V) and lower clamping voltage (87.1 V vs. 96.3 V), achieved through enhanced process control. Both share identical VWM (54 V), package (DO-214AC), and AEC-Q101 qualification - SMAJ54AH is preferred where precise clamping and reduced voltage overshoot are critical.
SMAJ54AH 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):
- 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)
SMAJ54AH FAQ
1.How can I place an order for SMAJ54AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ54AH 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 SMAJ54AH reliable?
The price and inventory of SMAJ54AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ54AH is usually 5 days.
3.What payment methods are accepted for SMAJ54AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ54AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ54AH?
SMAJ54AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ54AH 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 SMAJ54AH?
For technical support, including SMAJ54AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ54AH requirements.
6.How does Aetrix verify that SMAJ54AH is sourced from the original manufacturer or authorized distributors?
All SMAJ54AH 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 SMAJ54AH meets industry standards.
7.What is the process for return or replacement of SMAJ54AH?
All SMAJ54AH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ54AH, 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 SMAJ54AH part is unused and in its original packaging.
Return procedure for SMAJ54AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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