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Vishay General Semiconductor - Diodes Division SMAJ54AHM3_A/H
- Part No.:
- SMAJ54AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ54AHM3_A/H.pdf
- Description:
- TVS DIODE 54VWM 87.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,205
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Product details
Overview
SMAJ54AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on 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 (10/1000 μs waveform), targeting protection of MOSFETs, ICs, and sensor interfaces in automotive and industrial systems.
For engineers reviewing the SMAJ54AHM3_A/H datasheet, SMAJ54AHM3_A/H pinout, SMAJ54AHM3_A/H application, or SMAJ54AHM3_A/H equivalent, this device delivers verified AEC-Q101 qualification, halogen-free RoHS compliance, MSL Level 1 moisture sensitivity, and low incremental surge resistance - critical for high-reliability transient suppression in 12 V/24 V automotive subsystems and industrial control I/O stages.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, leveraging a glass-passivated silicon junction for fast response (<1 ps) and stable breakdown behavior. Its thermal design relies on RθJA = 120 °C/W (on 0.2" × 0.2" copper pads) and RθJL = 30 °C/W, enabling effective dissipation of 400 W non-repetitive pulses without thermal runaway under defined mounting conditions.
The SMAJ54AHM3_A/H meets ANSI/IEEE C62.35 surge standards and supports repetitive surge duty cycles up to 0.01 %, with derating above TA = 25 °C per Fig. 2. It exhibits a +0.104 %/°C temperature coefficient of VBR, ensuring predictable clamping voltage drift across its -55 °C to +150 °C operating junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 54 V - Maximum continuous reverse working voltage before leakage exceeds 1 μA; defines safe operating margin below clamping threshold. |
| VBR (min/max) | 60.0 V / 66.3 V at 1 mA - Confirmed breakdown range ensures reliable turn-on during overvoltage events without premature conduction. |
| VC @ IPPM | 87.1 V at 4.6 A - Clamping voltage under 10/1000 μs surge; limits downstream component stress to sub-90 V during 400 W transients. |
| PPPM | 400 W - Peak pulse power rating (10/1000 μs); enables robust protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 surges. |
| IFSM | 40 A - Peak forward surge current (8.3 ms half-sine); supports unidirectional inrush and fault-current handling in DC power rails. |
| TJ max | +150 °C - Maximum junction temperature; allows operation in under-hood automotive environments and sealed industrial enclosures. |
| Package | SMA (DO-214AC) - Surface-mount outline with 0.208" length, 0.157" width, and 0.090" height; compatible with standard SMT reflow (260 °C peak). |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, and cathode band marking for unidirectional polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / low-side connection | Connected to ground or lower-potential rail; forms current path during reverse-biased clamping. |
| Cathode | Reverse voltage sensing / high-side connection | Connected to protected line (e.g., 12 V supply or CAN-H); conducts when Vin > VBR to shunt surge energy. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for engine control, ADAS, and body electronics. |
| Halogen-free & RoHS-compliant | Meets JEDEC J-STD-020 MSL Level 1 and JESD201 Class 2 whisker resistance - ensures long-term solder joint integrity in lead-free assembly. |
| 400 W peak pulse power | Clamps 10/1000 μs transients up to 4.6 A while holding VC ≤ 87.1 V - protects 54 V-rated components without overstressing gate oxides or logic inputs. |
| Low incremental surge resistance | Minimizes VC – VBR differential (≤27.1 V), reducing let-through energy and improving system-level surge immunity margin. |
| Glass passivated junction | Provides stable leakage (<1 μA at VWM) and repeatable breakdown characteristics across lifetime and temperature extremes. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppressing load-dump and alternator ripple transients on 12 V/24 V battery-fed ECUs and lighting modules. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between power input and ground, responding within picoseconds to limit voltage excursions. Use Value: Maintains VC ≤ 87.1 V during 400 W surges, preventing latch-up or permanent damage to 60 V-rated DC-DC controllers and microcontrollers. |
Use Scenario: Shielding analog and digital sensor outputs (e.g., pressure, temperature, position) from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF typical at 0 V) TVS mounted directly at connector entry point to minimize stub inductance. Use Value: Limits induced voltage to <87.1 V during ±8 kV contact ESD (IEC 61000-4-2), preserving ADC reference stability and signal integrity in 16-bit sensor front-ends. |
| Motor Drive Gate Protection | Telecom Line Interface Protection |
Use Scenario: Protecting high-side N-channel MOSFET gates from inductive kickback during PWM switching in BLDC drivers. IC Role / Device Role / Timing Role: Fast-clamping unidirectional TVS connected between gate and source, triggered by dV/dt exceeding VBR. Use Value: Clamps gate-source voltage to ≤87.1 V within <1 ps, avoiding oxide breakdown in 60 V-rated logic-level MOSFETs used in 48 V motor control stages. |
Use Scenario: Guarding RS-485/RS-422 transceiver I/O pins against lightning-induced surges on outdoor telecom/data lines. IC Role / Device Role / Timing Role: Standoff-rated TVS (VWM = 54 V) placed on differential pair lines to clamp common-mode transients without affecting signal swing. Use Value: Withstands 400 W 10/1000 μs surges per IEC 61000-4-5 Level 3, enabling compliance in base station backhaul and remote terminal unit (RTU) designs. |
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_A/H | Same electrical specs and package; RoHS-compliant but not halogen-free; uses standard tin plating instead of halogen-free formulation. | Approved for commercial/industrial use only; not qualified to AEC-Q101; unsuitable for automotive under-hood deployment. | Select when halogen-free requirement is waived and cost optimization is prioritized over automotive qualification. |
| SMAJ54A-QH | Identical VWM, VBR, VC, and PPPM; AEC-Q101 qualified; halogen-free; differs only in tape-and-reel packaging (7" vs. 13" reel). | No functional or application difference; identical performance and qualification; intended for same automotive and industrial use cases. | Choose based on production line feeder compatibility - SMAJ54AHM3_A/H uses 7" reel (1800 pcs), SMAJ54A-QH uses 13" reel (7500 pcs). |
Compared with SMAJ54AHE3_A/H, SMAJ54AHM3_A/H adds halogen-free compliance and AEC-Q101 qualification without sacrificing clamping performance; versus SMAJ54A-QH, it shares full functional equivalence but differs only in reel size and ordering code - making it ideal for high-volume automotive SMT lines requiring traceable, eco-compliant components.
Availability
SMAJ54AHM3_A/H is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, and telecom line surge suppression requiring stable component supply, AEC-Q101 validation, and halogen-free manufacturing compliance.
Supply support for SMAJ54AHM3_A/H 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 reliability, efficiency, and application-specific optimization.
The SMAJ series was engineered for high-energy transient suppression in space-constrained surface-mount applications, targeting automotive, industrial, and telecom systems where robustness, fast response, and standardized qualification are mandatory.
FAQ
What is the maximum clamping voltage of the SMAJ54AHM3_A/H under a 10/1000 μs surge?
The SMAJ54AHM3_A/H has a maximum clamping voltage (VC) of 87.1 V at 4.6 A peak pulse current (IPPM) under a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024, Document Number 88390. The clamping performance ensures downstream components see less than 87.1 V during standardized surge events, supporting robust design margins for 60 V-rated ICs and MOSFETs.
Is SMAJ54AHM3_A/H qualified for automotive applications?
Yes, SMAJ54AHM3_A/H is AEC-Q101 qualified, as indicated by the "HM3" suffix and confirmed in the Vishay datasheet's Mechanical Data section. It undergoes stress testing for temperature cycling, high-temperature reverse bias (HTRB), and ESD per AEC-Q101 requirements, making it suitable for under-hood and chassis-mounted automotive electronics including body control modules, lighting drivers, and ADAS sensor interfaces.
What does the "HM3" suffix mean in SMAJ54AHM3_A/H?
The "HM3" suffix in SMAJ54AHM3_A/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering information table, HM3 parts use halogen-free molding compound and matte tin-plated leads meeting JESD201 Class 2 whisker resistance, distinguishing them from E3 (RoHS only) and HE3 (AEC-Q101 but not halogen-free) variants. The "_A/H" indicates 7" tape-and-reel packaging (1800 units).
Can SMAJ54AHM3_A/H be used in bidirectional configurations?
No, SMAJ54AHM3_A/H is a unidirectional TVS diode, as confirmed by its part number structure (no "CA" suffix) and the "UNI" designation in the Electrical Characteristics table. Bidirectional versions carry the "CA" suffix (e.g., SMAJ54CA). Using SMAJ54AHM3_A/H in bidirectional circuits would result in forward conduction on one polarity, causing failure; always select SMAJ54CA or equivalent for AC or dual-polarity protection.
What is the thermal resistance of SMAJ54AHM3_A/H, and how does it affect layout?
SMAJ54AHM3_A/H 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, and RθJL = 30 °C/W junction-to-lead. To maintain safe operation under 400 W surges, PCB layout must provide minimum recommended pad area and avoid excessive trace impedance; insufficient copper reduces heat dissipation and risks thermal runaway during repetitive transients.
SMAJ54AHM3_A/H 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:
- 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_A/H FAQ
1.How can I place an order for SMAJ54AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ54AHM3_A/H 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_A/H reliable?
The price and inventory of SMAJ54AHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ54AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ54AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ54AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ54AHM3_A/H?
SMAJ54AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ54AHM3_A/H 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_A/H?
For technical support, including SMAJ54AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ54AHM3_A/H requirements.
6.How does Aetrix verify that SMAJ54AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ54AHM3_A/H 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_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ54AHM3_A/H?
All SMAJ54AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ54AHM3_A/H, 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_A/H part is unused and in its original packaging.
Return procedure for SMAJ54AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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