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Vishay General Semiconductor - Diodes Division SMAJ54AHM3/I
- Part No.:
- SMAJ54AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ54AHM3/I.pdf
- Description:
- TVS DIODE 54VWM 87.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,635
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Product details
Overview
SMAJ54AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 54 V standoff voltage (VWM), 60–66.3 V breakdown range (VBR at 1 mA), 87.1 V maximum clamping voltage (VC) at 4.6 A peak pulse current, and 400 W peak pulse power rating (10/1000 μs waveform), making it suitable for automotive power rail and industrial sensor interface protection.
For engineers reviewing the SMAJ54AHM3/I datasheet, SMAJ54AHM3/I pinout, SMAJ54AHM3/I application, or SMAJ54AHM3/I equivalent, key selection criteria include its AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, SMA (DO-214AC) package with cathode band marking, and verified clamping performance under repetitive surge conditions per IEC 61000-4-5.
Technical Context
This TVS diode operates as a fast-acting shunt clamp during voltage transients, diverting surge energy to ground before downstream ICs or MOSFETs are damaged. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1 μA at 54 V), while its 120 °C/W junction-to-ambient thermal resistance requires appropriate PCB copper pad area (0.2" × 0.2") for sustained 3.3 W power dissipation.
The device responds in <1 ps to ESD and lightning-induced surges, with a low incremental surge resistance that maintains tight clamping across its 4.6 A rated peak pulse current. Its unidirectional polarity-marked by a cathode band-enables integration into DC-biased circuits such as 48 V automotive control modules and industrial PLC input stages without reverse conduction concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 54 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for protected circuit's normal DC bias. |
| VBR (min/max) | 60.0 V / 66.3 V at 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on above system operating voltage with margin. |
| VC @ IPPM | 87.1 V at 4.6 A - Clamped voltage during 10/1000 μs surge; defines worst-case stress on downstream components. |
| PPPM | 400 W - Peak pulse power handling capability; validated for 0.01% duty cycle surges per JEDEC standards. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); supports inrush and fault-current events in power rails. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments and sealed industrial enclosures. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm length, 4.50 mm width, and 2.29 mm height; compatible with standard SMT reflow profiles (MSL Level 1, 260 °C peak). |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1 compliant, 0.2" × 0.2" copper pad layout recommended per datasheet Fig. 6.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to protected line's lower-potential side (e.g., GND or return path); must be routed with low-inductance trace. |
| Cathode (banded end) | Reverse-biased terminal | Connected to protected line's higher-potential side (e.g., +54 V rail); clamping occurs when voltage exceeds VBR relative to anode. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS power supplies per stress test requirements. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and JESD201 Class 2 whisker resistance; suitable for green manufacturing and export compliance. |
| 400 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth) without degradation when mounted per recommended pad layout. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage overshoot during transients, reducing risk of latch-up or gate oxide damage in protected MOSFETs and microcontrollers. |
| Glass passivated junction | Ensures stable VBR over temperature (-55 °C to +150 °C) and long-term reliability in high-humidity industrial environments. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting 48 V battery-fed ECUs against load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Shunt-clamp TVS placed between power rail and chassis ground to limit voltage excursions to ≤87.1 V. Use Value: Prevents permanent damage to CAN transceivers and MCU power domains during ISO 16750-2 pulse 5a/b events. | Use Scenario: Safeguarding analog inputs of industrial pressure sensors exposed to motor switching noise. IC Role / Device Role / Timing Role: Unidirectional clamp on 24 V supply line upstream of op-amp front-end, referenced to local ground. Use Value: Maintains signal integrity by suppressing 1 kV/μs fast transients before they couple into ADC reference paths. |
| Telecom DC Power Input | Consumer USB-C Power Delivery |
Use Scenario: Secondary-side overvoltage protection in telecom base station DC-DC converters. IC Role / Device Role / Timing Role: Standoff-rated TVS on +54 V output rail, absorbing coupled surges from AC mains input stage. Use Value: Enables compliance with GR-1089-CORE immunity requirements without adding bulkier MOV-based solutions. | Use Scenario: Input-stage surge suppression for USB-C PD controllers handling up to 48 V negotiation. IC Role / Device Role / Timing Role: Unidirectional clamp between VBUS and GND, activated only during positive overvoltage faults. Use Value: Survives repeated 10/1000 μs surges up to 400 W while maintaining <1 μA leakage at 54 V standby. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ54AHE3/I | Same electrical specs but RoHS-compliant (non-halogen-free) and commercial-grade; lacks AEC-Q101 qualification. | Approved for non-automotive industrial use only; not certified for automotive production programs. | Select when halogen-free content is not required and automotive qualification is unnecessary. |
| SMBJ54A-M3/5A | Higher 600 W PPPM, SMB (DO-214AA) package (larger footprint, 30% higher thermal mass), same VWM/VC. | Better suited for high-energy surge environments (e.g., outdoor telecom cabinets) where board space permits larger package. | Choose when enhanced surge margin is needed and PCB layout allows SMB footprint. |
Compared with SMAJ54AHM3/I, SMAJ54AHE3/I offers identical clamping and standoff performance but omits halogen-free and automotive qualifications, while SMBJ54A-M3/5A trades compactness for higher pulse power and thermal robustness-making SMAJ54AHM3/I optimal for space-constrained AEC-Q101-compliant designs.
Availability
SMAJ54AHM3/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom power supply designs requiring stable component supply with full traceability and lifecycle management.
Supply support for SMAJ54AHM3/I 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, and protection devices with emphasis on reliability, precision, and automotive-grade validation.
The SMAJ series was engineered specifically for high-reliability transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where consistent clamping and long-term stability are critical.
FAQ
What is the maximum clamping voltage of the SMAJ54AHM3/I under a 10/1000 μs surge?
The SMAJ54AHM3/I has a maximum clamping voltage (VC) of 87.1 V at its rated peak pulse current of 4.6 A under a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 test conditions and defines the upper voltage limit imposed on protected circuitry during standardized surge events. The SMAJ54AHM3/I maintains this clamping performance across its specified operating temperature range.
Is the SMAJ54AHM3/I qualified for automotive applications?
Yes, the SMAJ54AHM3/I is AEC-Q101 qualified, as indicated by the "HM3" suffix (halogen-free, RoHS-compliant, and AEC-Q101 qualified). It has passed stress tests including high-temperature operating life, temperature cycling, and surge robustness required for automotive powertrain and body electronics. The SMAJ54AHM3/I is approved for use in engine control units, ADAS modules, and infotainment power supplies.
What does the "HM3" suffix mean in SMAJ54AHM3/I?
The "HM3" suffix in SMAJ54AHM3/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from commercial-grade versions (e.g., "E3") and confirms compliance with automotive reliability standards, JESD201 Class 2 whisker resistance, and UL 94 V-0 flammability rating. The SMAJ54AHM3/I is supplied in 13" tape-and-reel (I-pack) format with 7500 units per reel.
How does the SMAJ54AHM3/I compare to bidirectional TVS diodes like SMAJ54CA?
The SMAJ54AHM3/I is unidirectional and intended for DC-biased lines where reverse conduction must be blocked; SMAJ54CA is bidirectional and used in AC-coupled or floating signal paths. Their VWM and VC values differ: SMAJ54CA has symmetric clamping in both directions, while SMAJ54AHM3/I clamps only on positive transients relative to its cathode. The SMAJ54AHM3/I includes a visible cathode band for polarity identification, unlike the unmarked SMAJ54CA.
What PCB layout guidance applies to the SMAJ54AHM3/I for optimal surge performance?
For optimal surge performance, the SMAJ54AHM3/I must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in Vishay Document 88390. Short, wide traces to ground and protected line minimize inductance; placement should be within 2 mm of the connector or IC being protected. Thermal relief patterns are discouraged-the SMAJ54AHM3/I relies on direct copper area for heat dissipation during repetitive pulses.
SMAJ54AHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ54AHM3/I FAQ
1.How can I place an order for SMAJ54AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ54AHM3/I 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 SMAJ54AHM3/I reliable?
The price and inventory of SMAJ54AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ54AHM3/I is usually 5 days.
3.What payment methods are accepted for SMAJ54AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ54AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ54AHM3/I?
SMAJ54AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ54AHM3/I 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 SMAJ54AHM3/I?
For technical support, including SMAJ54AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ54AHM3/I requirements.
6.How does Aetrix verify that SMAJ54AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ54AHM3/I 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 SMAJ54AHM3/I meets industry standards.
7.What is the process for return or replacement of SMAJ54AHM3/I?
All SMAJ54AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ54AHM3/I, 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 SMAJ54AHM3/I part is unused and in its original packaging.
Return procedure for SMAJ54AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ54AHM3/I Tags
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