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Vishay General Semiconductor - Diodes Division SMAJ54CAHM3/I
- Part No.:
- SMAJ54CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ54CAHM3/I.pdf
- Description:
- TVS DIODE 54VWM 87.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,157
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Product details
Overview
SMAJ54CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal or power 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 with 10/1000 μs waveform.
For engineers reviewing the SMAJ54CAHM3/I datasheet, SMAJ54CAHM3/I pinout, SMAJ54CAHM3/I application, or SMAJ54CAHM3/I equivalent, this device is selected for robust ESD and surge protection in automotive sensor interfaces, industrial I/O modules, and telecom line receivers where bidirectional clamping, AEC-Q101 qualification, and low-profile SMT placement are required.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or differential signal paths without polarity concerns. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at 54 V), while the low incremental surge resistance supports fast transient response under high-current surges.
The device is rated for 150 °C maximum junction temperature and meets MSL Level 1 per J-STD-020 with 260 °C lead-free reflow compatibility. Its thermal resistance (RθJA = 120 °C/W) reflects standard PCB pad layout performance, and it is halogen-free and RoHS-compliant per HM3 suffix designation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 54 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR (min/max) | 60.0 V / 66.3 V at 1 mA - Verified breakdown threshold range; ensures reliable turn-on during overvoltage events. |
| VC @ IPPM | 87.1 V at 4.6 A - Clamped voltage during 10/1000 μs surge; determines worst-case stress on downstream components. |
| PPPM | 400 W - Peak pulse power handling capability; enables suppression of high-energy transients like ISO 7637-2 Pulse 1/2a/5a. |
| IPPM | 4.6 A - Peak surge current supported at rated clamping voltage; correlates directly with system-level surge test compliance. |
| Junction Temp Range | –55 °C to +150 °C - Specifies full operational envelope for automotive under-hood and industrial environments. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including HTOL, TC, UHAST, and ESD testing per AEC specification. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); cathode band absent per bidirectional design.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (either direction) | One terminal of symmetrical PN junction; accepts surge current regardless of polarity during clamping event. |
| Anode | Transient current exit (either direction) | Same physical terminal functions as return path when opposite polarity surge occurs; enables true bidirectional operation. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), or ungrounded sensor outputs without polarity constraints. |
| 400 W peak pulse power | Supports IEC 61000-4-5 Level 4 (4 kV line-to-line) and ISO 7637-2 Pulse 5a (75 V/300 ms) in properly designed layouts. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including engine control units, ADAS sensors, and body electronics requiring long-term field reliability. |
| Halogen-free & RoHS-compliant | Fulfills environmental compliance requirements for EU, China RoHS, and automotive OEM sustainability mandates. |
| MSL Level 1, 260 °C reflow | Permits standard lead-free SMT assembly without moisture sensitivity concerns or baking preconditioning. |
Applications
| Automotive Sensor Interface | Industrial Analog I/O Module |
|---|---|
|
Use Scenario: Protecting LIN bus or analog output pins of pressure/temperature sensors in engine bay or chassis modules exposed to load dump and inductive switching noise. IC Role / Device Role / Timing Role: Bidirectional transient clamp placed between sensor output and microcontroller ADC input or LIN transceiver. Use Value: Limits induced surges to ≤87.1 V, preventing latch-up or damage to 5 V or 3.3 V interface ICs while maintaining signal integrity below 54 V normal operation. |
Use Scenario: Safeguarding 4–20 mA current loop inputs and ±10 V analog inputs in PLC analog input cards subjected to field wiring faults and EFT bursts. IC Role / Device Role / Timing Role: Primary front-end TVS across input terminals, coordinated with series impedance and filtering for IEC 61000-4-4/4-5 compliance. Use Value: Absorbs up to 400 W transient energy without degradation, ensuring uninterrupted operation during factory floor surge events. |
| Telecom Line Receiver | Consumer USB Port Protection |
|
Use Scenario: Shielding RS-232/RS-485 transceivers in base station backhaul equipment from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Differential-mode TVS pair (one per line) placed immediately at connector entry point before signal conditioning. Use Value: Symmetrical clamping maintains common-mode rejection ratio (CMRR) while limiting differential overvoltage to safe levels for transceiver ICs. |
Use Scenario: Adding secondary surge protection on VBUS and D+/D− lines of USB 2.0 ports in smart home hubs after primary polymer PTC and ESD array. IC Role / Device Role / Timing Role: High-energy backup suppressor handling rare but destructive 10/1000 μs surges that exceed ESD diode ratings. Use Value: Extends system-level surge immunity beyond IEC 61000-4-5 Level 2 (1 kV line-earth), supporting CE certification with margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ54CAHE3/I | Same electrical specs, but RoHS-compliant commercial grade (not halogen-free); lacks AEC-Q101 qualification. | Suitable for non-automotive industrial or consumer use where halogen-free requirement or automotive qualification is not mandated. | Select SMAJ54CAHE3/I only if AEC-Q101 and halogen-free compliance are unnecessary; otherwise SMAJ54CAHM3/I is preferred. |
| SMBJ54CAHM3/I | Same VWM/VC, but SMB (DO-214AA) package: 5.3 mm × 4.1 mm footprint, higher PPPM = 600 W, RθJA = 100 °C/W. | Better suited for higher-power surge environments or designs with thermal margin constraints; requires larger PCB area. | Choose SMBJ54CAHM3/I when >400 W surge handling or improved thermal performance is needed; SMAJ54CAHM3/I fits tighter layouts. |
Compared with SMAJ54CAHE3/I, SMAJ54CAHM3/I adds halogen-free and AEC-Q101 assurance for automotive use; versus SMBJ54CAHM3/I, it trades 200 W lower pulse power for 30% smaller footprint and identical mounting compatibility in space-constrained modules.
Availability
SMAJ54CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O hardening, and telecom line receiver designs requiring stable component supply, AEC-Q101 validation, and halogen-free compliance.
Supply support for SMAJ54CAHM3/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMAJ series is engineered for high-reliability transient suppression in automotive, industrial, and communications systems, balancing compact size, surge robustness, and qualification rigor.
FAQ
What is the clamping voltage of SMAJ54CAHM3/I at its rated peak pulse current?
The SMAJ54CAHM3/I has a maximum clamping voltage (VC) of 87.1 V at its rated peak pulse current (IPPM) of 4.6 A under a 10/1000 μs waveform. This value is measured per standard test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ54CAHM3/I maintains this clamping performance across its qualified operating temperature range.
Is SMAJ54CAHM3/I suitable for automotive applications?
Yes, SMAJ54CAHM3/I is AEC-Q101 qualified and specifically designated for automotive use via the HM3 suffix. It undergoes rigorous stress testing including high-temperature operating life, temperature cycling, and ESD verification. The SMAJ54CAHM3/I is commonly deployed in engine control, body electronics, and ADAS sensor modules where reliability under harsh thermal and electrical conditions is mandatory.
How does the bidirectional design of SMAJ54CAHM3/I affect its circuit placement?
The bidirectional design of SMAJ54CAHM3/I eliminates polarity sensitivity, allowing it to be placed across any two nodes requiring symmetrical overvoltage protection-such as differential signal pairs (RS-485), AC-coupled lines, or ungrounded sensor outputs-without regard to anode/cathode orientation. Unlike unidirectional TVS diodes, SMAJ54CAHM3/I has no marking band and functions identically in either direction, simplifying layout and reducing BOM complexity.
What is the standoff voltage rating for SMAJ54CAHM3/I, and why is it important?
The standoff voltage (VWM) of SMAJ54CAHM3/I is 54 V, representing the maximum continuous reverse voltage the device can block without entering conduction. This parameter ensures the SMAJ54CAHM3/I remains inactive during normal operation, avoiding leakage-related errors or power loss, while still triggering promptly when transients exceed the breakdown threshold. It directly determines compatibility with 48 V automotive systems and industrial 4–20 mA loops.
Does SMAJ54CAHM3/I require special PCB layout considerations for optimal surge performance?
Yes-optimal surge performance for SMAJ54CAHM3/I requires short, low-inductance traces between the device and protected node, with minimum 5.0 mm × 5.0 mm copper pads per terminal as specified in the Vishay datasheet. Thermal relief and ground plane connectivity significantly impact its ability to sustain repetitive surges. The SMAJ54CAHM3/I's RθJA of 120 °C/W assumes this recommended pad layout; deviating reduces power handling and may cause thermal runaway under sustained stress.
SMAJ54CAHM3/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:
- -
- 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:
- 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)
SMAJ54CAHM3/I FAQ
1.How can I place an order for SMAJ54CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ54CAHM3/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 SMAJ54CAHM3/I reliable?
The price and inventory of SMAJ54CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ54CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMAJ54CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ54CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ54CAHM3/I?
SMAJ54CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ54CAHM3/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 SMAJ54CAHM3/I?
For technical support, including SMAJ54CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ54CAHM3/I requirements.
6.How does Aetrix verify that SMAJ54CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ54CAHM3/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 SMAJ54CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMAJ54CAHM3/I?
All SMAJ54CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ54CAHM3/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 SMAJ54CAHM3/I part is unused and in its original packaging.
Return procedure for SMAJ54CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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