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Vishay General Semiconductor - Diodes Division SMAJ54CAHM3_A/I
- Part No.:
- SMAJ54CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ54CAHM3_A/I.pdf
- Description:
- TVS DIODE 54VWM 87.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,465
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Product details
Overview
SMAJ54CAHM3_A/I from Vishay General Semiconductor is a bidirectional 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), 60.0–66.3 V breakdown voltage (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 - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ54CAHM3_A/I datasheet, SMAJ54CAHM3_A/I pinout, SMAJ54CAHM3_A/I application, or SMAJ54CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a silicon avalanche diode optimized for fast-response transient suppression. Its bidirectional architecture enables symmetrical clamping in both polarities without polarity marking, supporting protection of AC-coupled or differential signal paths. The glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and repeatable breakdown behavior across temperature.
Designed for surface-mount use, it leverages the SMA (DO-214AC) package's low profile and J-STD-020 MSL Level 1 rating (260 °C peak reflow). Thermal performance is defined by RθJL = 30 °C/W and RθJA = 120 °C/W, requiring appropriate PCB copper area for sustained 3.3 W power dissipation at TA = 50 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 54 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 60.0 V / 66.3 V at IT = 1 mA - guaranteed avalanche onset range under standardized test conditions |
| VC @ IPPM | 87.1 V at 4.6 A - clamped voltage during 10/1000 μs surge, defining worst-case overvoltage seen by protected circuit |
| PPPM | 400 W - peak pulse power handling with 10/1000 μs waveform, derated above TA = 25 °C per Fig. 2 |
| ID @ VWM | ≤1.0 μA - reverse leakage current at rated standoff voltage, critical for low-power sensor line integrity |
| TJ max | +150 °C - maximum junction temperature, enabling operation in under-hood automotive environments |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 0.208" x 0.157" footprint and matte tin-plated leads |
Pinout & Package
Package: SMA (DO-214AC), molded case with UL 94 V-0 flammability rating; no polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias (unidirectional mode) | Not functional in bidirectional operation; terminals are symmetric and interchangeable |
| Cathode | Current exit terminal in forward bias (unidirectional mode) | Not functional in bidirectional operation; terminals are symmetric and interchangeable |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals or floating lines without polarity concerns |
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces |
| 400 W peak pulse power | Withstands IEC 61000-4-5 surge events up to 4.6 A (10/1000 μs) without degradation |
| MSL Level 1 | Supports lead-free reflow up to 260 °C peak without moisture-induced failure |
| Glass passivated junction | Ensures stable VBR and low leakage over 1000+ thermal cycles and 15-year field life |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ESD in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential or single-ended signal lines upstream of interface ICs. Use Value: Limits transient overvoltage to ≤87.1 V during 10/1000 μs surges, preserving signal integrity and preventing latch-up in downstream ASICs. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to relay coil flyback and motor drive noise. IC Role / Device Role / Timing Role: Parallel-connected TVS across 24 V DC input terminals to shunt inductive energy into ground. Use Value: Absorbs 400 W surge pulses without failure, maintaining system uptime and eliminating need for external snubbers. |
| Consumer Power Adapter Output | Telecom Line Interface |
|
Use Scenario: Secondary-side overvoltage suppression in USB-C PD adapters and AC/DC wall adapters. IC Role / Device Role / Timing Role: Clamping component on regulated 5–20 V output rails to prevent damage during feedback loop faults. Use Value: Responds in <1 ps to transients, limiting output overshoot to safe levels for connected devices like smartphones and laptops. |
Use Scenario: Primary protection for Ethernet PHYs and DSL line drivers against lightning-induced surges on twisted-pair cables. IC Role / Device Role / Timing Role: First-stage TVS on RJ-45 interface, paired with GDT or MOV for multi-level defense. Use Value: Withstands repeated 10/1000 μs surges up to 4.6 A while maintaining <1.0 μA leakage at 54 V, ensuring low standby power loss. |
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_A/I | Same electrical specs; RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification | Approved for commercial/industrial use only; not certified for automotive under-hood deployment | Select when halogen-free content is not required and automotive qualification is unnecessary |
| SMAJ54AHE3_A/I | Unidirectional version; cathode band marked; VF = 3.5 V at 25 A forward conduction | Requires polarity-aware layout; unsuitable for AC or floating signal lines | Choose only for DC-biased circuits where unidirectional clamping suffices and polarity can be controlled |
Compared with SMAJ54CAHM3_A/I, the HE3 variant trades halogen-free compliance and AEC-Q101 qualification for lower cost in non-automotive settings, while the unidirectional SMAJ54AHE3_A/I introduces polarity dependency and forward conduction capability - making it incompatible for bidirectional signal protection without redesign.
Availability
SMAJ54CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line protection requiring stable component supply, halogen-free material compliance, and AEC-Q101 validation.
Supply support for SMAJ54CAHM3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade qualification.
The SMAJ series targets high-reliability transient suppression in harsh environments, with design focus on fast response, stable clamping, and robust SMT manufacturability for automotive, industrial, and telecom infrastructure.
FAQ
What is the clamping voltage of SMAJ54CAHM3_A/I at its rated peak pulse current?
The SMAJ54CAHM3_A/I has a maximum clamping voltage (VC) of 87.1 V at its specified peak pulse current (IPPM) of 4.6 A, measured using the standard 10/1000 μs double-exponential waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is confirmed in the Vishay datasheet Document Number 88390, Table on page 2. The SMAJ54CAHM3_A/I maintains this clamping performance across its full operating temperature range of −55 °C to +150 °C.
Is SMAJ54CAHM3_A/I qualified for automotive applications?
Yes, SMAJ54CAHM3_A/I is AEC-Q101 qualified, as indicated by the "HM3" suffix and confirmed in the Vishay ordering information table (page 3, Document Number 88390). This qualification validates its reliability for automotive use cases including engine control, body electronics, and ADAS sensor interfaces. The SMAJ54CAHM3_A/I meets stress tests for temperature cycling, humidity, mechanical shock, and accelerated life under bias - all per AEC-Q101 Rev D requirements.
What does the "HM3" suffix signify in SMAJ54CAHM3_A/I?
The "HM3" suffix in SMAJ54CAHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering nomenclature (page 3, Document Number 88390), "H" indicates AEC-Q101 qualification, "M" specifies halogen-free molding compound, and "3" confirms RoHS compliance. The trailing "_A/I" specifies packaging: "A" is the revision code and "I" denotes 13-inch tape-and-reel delivery with 7500 units per reel.
How does SMAJ54CAHM3_A/I differ from unidirectional SMAJ54A variants?
SMAJ54CAHM3_A/I is bidirectional with symmetrical clamping in both polarities and no polarity marking, whereas SMAJ54A variants are unidirectional with a visible cathode band and forward voltage drop (VF = 3.5 V at 25 A). The SMAJ54CAHM3_A/I supports AC-coupled or floating signal lines, while SMAJ54A requires correct orientation and conducts in forward bias - making them functionally non-interchangeable without layout changes.
What PCB layout guidance applies to SMAJ54CAHM3_A/I for optimal thermal performance?
For optimal thermal performance, SMAJ54CAHM3_A/I should be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the Vishay datasheet (page 1, Note 2). This pad area enables rated 400 W pulse power dissipation and supports the device's RθJA of 120 °C/W. Use short, wide traces to minimize inductance, avoid thermal reliefs on pads, and ensure solder mask defined pads for consistent reflow yield - especially critical for AEC-Q101 reliability validation.
SMAJ54CAHM3_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:
- -
- 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_A/I FAQ
1.How can I place an order for SMAJ54CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ54CAHM3_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 SMAJ54CAHM3_A/I reliable?
The price and inventory of SMAJ54CAHM3_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 SMAJ54CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ54CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ54CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ54CAHM3_A/I?
SMAJ54CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ54CAHM3_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 SMAJ54CAHM3_A/I?
For technical support, including SMAJ54CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ54CAHM3_A/I requirements.
6.How does Aetrix verify that SMAJ54CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ54CAHM3_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 SMAJ54CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ54CAHM3_A/I?
All SMAJ54CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ54CAHM3_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 SMAJ54CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ54CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ54CAHM3_A/I Tags
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