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Vishay General Semiconductor - Diodes Division SMAJ54AHE3_A/I
- Part No.:
- SMAJ54AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ54AHE3_A/I.pdf
- Description:
- TVS DIODE 54VWM 87.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,434
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Product details
Overview
SMAJ54AHE3_A/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 54 V standoff voltage (VWM), 60.0–66.3 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 (10/1000 μs waveform). It is AEC-Q101 qualified and used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial power rails.
For engineers reviewing the SMAJ54AHE3_A/I datasheet, SMAJ54AHE3_A/I pinout, SMAJ54AHE3_A/I application, or SMAJ54AHE3_A/I equivalent, key selection criteria include its unidirectional polarity, 120 °C/W junction-to-ambient thermal resistance, 150 °C max operating junction temperature, and RoHS-compliant, AEC-Q101-qualified construction for automotive-grade reliability.
Technical Context
This TVS diode operates as a fast-acting shunt clamp during voltage transients, diverting surge current away from protected circuitry once reverse voltage exceeds VBR. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 μA at 54 V), while the SMA package supports automated SMT placement and meets MSL Level 1 reflow requirements (260 °C peak).
The device delivers 400 W peak pulse power up to 78 V and derates to 300 W above that threshold, with a typical clamping ratio (VC/VBR) of ~1.45 and temperature coefficient of +0.104 %/°C - enabling predictable performance across automotive temperature ranges (-55 °C to +150 °C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 54 V - Maximum continuous reverse operating voltage before significant conduction begins |
| VBR (Breakdown Voltage) | 60.0–66.3 V at 1 mA - Confirmed minimum/maximum reverse breakdown threshold under standardized test conditions |
| VC (Clamping Voltage) | 87.1 V at IPPM = 4.6 A - Peak voltage seen across protected circuit during 10/1000 μs surge event |
| PPPM (Peak Pulse Power) | 400 W (≤78 V), 300 W (>78 V) - Surge energy handling capacity per single 10/1000 μs waveform |
| IFSM (Surge Current) | 40 A (8.3 ms half-sine) - Unidirectional forward surge capability for inrush or fault-current events |
| TJ max. | +150 °C - Maximum allowable junction temperature for sustained operation and reliability validation |
| RθJA | 120 °C/W - Thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs board-level thermal design |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by band marking; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line (e.g., power rail); conducts surge current to ground when VREV > VBR |
| Anode (unbanded end) | Reference/return path | Typically tied to system ground or lower-potential reference; completes clamping path during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and body electronics requiring extended temperature and life-cycle reliability |
| 400 W peak pulse power (10/1000 μs) | Enables protection against ISO 7637-2 pulse 1, 2a, 2b, and 5a transients without derating in compact layouts |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving margin for 5 V–60 V logic and power ICs |
| MSL Level 1 moisture sensitivity | Allows standard reflow assembly without dry-pack or baking, reducing manufacturing overhead and risk of popcorning |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage (<1 μA) over lifetime, critical for battery-powered and always-on systems |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Guarding |
|---|---|
Use Scenario: Protecting 12 V/24 V supply inputs in ADAS camera modules and infotainment head units from load dump and alternator ripple. IC Role / Device Role / Timing Role: Shunt-clamp TVS placed between power rail and chassis ground to limit transient excursions below IC absolute maximum ratings. Use Value: Withstands 400 W surges and clamps to ≤87.1 V, preserving integrity of 60 V-rated DC-DC controllers and CAN transceivers downstream. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops) of pressure/temperature sensors in PLC I/O modules. IC Role / Device Role / Timing Role: Bidirectional-capable variant not applicable; this unidirectional SMAJ54AHE3_A/I protects grounded-signal paths where polarity is fixed. Use Value: Sub-1 μA leakage at 54 V prevents signal offset drift; fast response (<1 ns) suppresses ESD and switching noise before it corrupts ADC readings. |
| Consumer Power Adapter Input Stage | Telecom DC Power Feeding Interface |
Use Scenario: Front-end surge suppression in USB-C PD adapters and wireless charging base stations exposed to AC line transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on secondary-side 20 V bus, coordinated with upstream MOV and fuse. Use Value: 87.1 V clamping ensures downstream GaN FETs (VDS = 100 V) operate within safe SOA during 1 kV/0.5 J surges per IEC 61000-4-5. |
Use Scenario: Protection of -48 V DC feeding ports in remote radio heads and small-cell base stations against lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS installed between feed line and return, referenced to system ground to clamp positive-going transients. Use Value: AEC-Q101 qualification and 150 °C TJ rating support outdoor deployment; 120 °C/W RθJA enables thermal management on minimal PCB copper. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ54A-E3/61 | Same electrical specs and SMA package; commercial-grade (non-AEC-Q101), RoHS-compliant only | Lacks automotive qualification; suitable for consumer/industrial designs without AEC compliance mandates | Select when cost sensitivity outweighs automotive qualification requirements and lifecycle assurance is not mandated |
| SMAJ54CAHE3_A/I | Bidirectional version with identical VWM, VBR, and VC; symmetric clamping in both polarities | Required for AC-coupled or floating signal lines where polarity reversal may occur (e.g., RS-485, Ethernet PHY) | Choose only if bidirectional protection is needed; otherwise SMAJ54AHE3_A/I offers tighter leakage and simpler grounding |
Compared with SMAJ54A-E3/61, SMAJ54AHE3_A/I adds AEC-Q101 qualification and traceable automotive sourcing, while SMAJ54CAHE3_A/I trades unidirectional precision for symmetrical clamping - making SMAJ54AHE3_A/I optimal for grounded 54 V DC rails demanding automotive reliability.
Availability
SMAJ54AHE3_A/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, and telecom power feeding circuits requiring stable component supply with full AEC-Q101 traceability and long-term lifecycle support.
Supply support for SMAJ54AHE3_A/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, MOSFETs, and protection devices with emphasis on high-reliability, automotive-qualified components.
The SMAJ series was developed specifically for surface-mount transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where compact size, repeatable clamping, and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of the SMAJ54AHE3_A/I under a 10/1000 μs surge?
The SMAJ54AHE3_A/I has a maximum clamping voltage (VC) of 87.1 V at a peak pulse current (IPPM) of 4.6 A using the standardized 10/1000 μs waveform. This value is measured per JEDEC standards and reflects worst-case voltage seen by protected circuitry during surge events - critical for ensuring downstream ICs remain within their absolute maximum ratings. The SMAJ54AHE3_A/I maintains this clamping performance across its specified operating temperature range.
Is SMAJ54AHE3_A/I suitable for automotive applications?
Yes, SMAJ54AHE3_A/I is AEC-Q101 qualified, meaning it has passed stress tests for temperature cycling, humidity, mechanical shock, and high-temperature operating life required for automotive electronics. Its construction - including glass-passivated junction, MSL Level 1 packaging, and 150 °C max junction temperature - supports use in engine control units, body control modules, and ADAS subsystems. The "HE3" suffix explicitly denotes AEC-Q101 compliance, distinguishing it from commercial variants like SMAJ54A-E3/61.
How does the SMAJ54AHE3_A/I differ from the bidirectional SMAJ54CAHE3_A/I?
The SMAJ54AHE3_A/I is unidirectional and features a cathode band for polarity-sensitive placement, while SMAJ54CAHE3_A/I is bidirectional with no polarity marking and symmetric clamping in both directions. Electrically, both share identical VWM (54 V), VBR (60.0–66.3 V), and VC (87.1 V), but SMAJ54AHE3_A/I exhibits lower reverse leakage (<1.0 μA vs. ≤2.0 μA for bidirectional types at VWM). Choose SMAJ54AHE3_A/I for grounded DC rails; select SMAJ54CAHE3_A/I only for AC or floating differential lines like RS-485.
What is the thermal resistance of SMAJ54AHE3_A/I, and how does it affect PCB layout?
The SMAJ54AHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard FR-4 PCB with no internal planes. To maintain TJ ≤ 150 °C under worst-case 3.3 W steady-state dissipation, designers must ensure adequate copper area and avoid excessive ambient temperatures. For high-reliability automotive use, thermal vias and ground-plane connections are recommended to reduce effective RθJA.
Does SMAJ54AHE3_A/I meet RoHS and halogen-free requirements?
Yes, SMAJ54AHE3_A/I is RoHS-compliant and manufactured with lead-free, halogen-free molding compound and matte tin-plated leads. The "HE3" suffix confirms compliance with EU RoHS Directive 2011/65/EU and JEDEC JS709E halogen-free standards. It also satisfies JESD 201 Class 2 whisker resistance and UL 94 V-0 flammability rating - making it suitable for environmentally regulated markets including automotive OEMs and industrial safety-certified equipment.
SMAJ54AHE3_A/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:
- 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)
SMAJ54AHE3_A/I FAQ
1.How can I place an order for SMAJ54AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ54AHE3_A/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 SMAJ54AHE3_A/I reliable?
The price and inventory of SMAJ54AHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ54AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ54AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ54AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ54AHE3_A/I?
SMAJ54AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ54AHE3_A/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 SMAJ54AHE3_A/I?
For technical support, including SMAJ54AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ54AHE3_A/I requirements.
6.How does Aetrix verify that SMAJ54AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ54AHE3_A/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 SMAJ54AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ54AHE3_A/I?
All SMAJ54AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ54AHE3_A/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 SMAJ54AHE3_A/I part is unused and in its original packaging.
Return procedure for SMAJ54AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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