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Vishay General Semiconductor - Diodes Division SMAJ54AHM3/H
- Part No.:
- SMAJ54AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ54AHM3/H.pdf
- Description:
- TVS DIODE 54VWM 87.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,188
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Product details
Overview
SMAJ54AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection of sensitive electronics. 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). It is widely deployed in automotive power line and sensor interface protection.
For engineers reviewing the SMAJ54AHM3/H datasheet, SMAJ54AHM3/H pinout, SMAJ54AHM3/H application, or SMAJ54AHM3/H equivalent, key selection considerations include its AEC-Q101 qualification, halogen-free RoHS-compliant HM3 suffix, 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 protector that remains high-impedance below VWM = 54 V and transitions to low-impedance conduction above VBR (min 60 V) to clamp transients. Its glass-passivated junction ensures stable leakage (<1 μA at VWM) and repeatable breakdown behavior across temperature (−55 °C to +150 °C).
The device delivers 400 W peak pulse power handling up to 78 V, derating to 300 W above that threshold, with thermal resistance RθJA = 120 °C/W on standard 0.2" × 0.2" copper pads. Its 10/1000 μs response time and low incremental surge resistance enable effective suppression of ESD, lightning-induced surges, and inductive switching spikes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 54 V - Maximum continuous reverse operating voltage before significant leakage begins; defines safe operating margin for 48 V automotive systems. |
| VBR (min/max) | 60.0 V / 66.3 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on during transient events without premature conduction. |
| VC @ IPPM | 87.1 V at 4.6 A - Clamped voltage seen by protected circuit during 10/1000 μs surge; limits stress on downstream ICs and MOSFETs. |
| PPPM | 400 W - Peak pulse power capability with 10/1000 μs waveform; supports IEC 61000-4-5 Level 4 surge immunity testing. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); validates robustness against load dump events. |
| TJ max | +150 °C - Maximum junction temperature enabling operation in under-hood automotive environments. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 5.28 mm length, 4.50 mm width, and 2.29 mm height; compatible with automated pick-and-place. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1 (260 °C peak reflow), polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or common return path; forms current path during reverse-biased clamping. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., battery rail or signal trace); carries surge current into the device during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance - required for engine control, body electronics, and ADAS modules. |
| Halogen-free & RoHS-compliant (HM3) | Meets JESD201 Class 2 whisker resistance and UL 94 V-0 flammability; supports green manufacturing and end-of-life compliance. |
| 400 W peak pulse power (≤78 V) | Enables single-device protection against ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 Combination Wave surges without external series impedance. |
| Fast response time & low VC/VBR ratio | Clamps within picoseconds with VC/VBR ≈ 1.45 - minimizes let-through energy and protects fast-switching MOSFET gates and microcontroller I/O pins. |
| Glass passivated junction | Ensures stable leakage (<1 μA at VWM) and consistent VBR over lifetime, critical for long-term field reliability in industrial and automotive applications. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V/48 V battery rails and alternator outputs from load dump, jump-start, and ISO 7637-2 transients. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between power rail and chassis ground to clamp positive-going surges. Use Value: Limits peak voltage to ≤87.1 V during 4.6 A surge, preventing damage to PMICs, CAN transceivers, and MCU power domains. |
Use Scenario: Safeguarding analog and digital sensor outputs (e.g., pressure, temperature, position) connected to microcontrollers in harsh factory environments. IC Role / Device Role / Timing Role: Point-of-entry TVS on signal lines to absorb ESD (IEC 61000-4-2 ±8 kV contact) and inductive kickback from solenoid drivers. Use Value: Sub-100 ns response and <1 μA leakage preserve signal integrity while enabling direct connection to 3.3 V/5 V ADC inputs without attenuation. |
| Telecom DC Power Input Protection | Consumer Device USB/DC Jack Protection |
|
Use Scenario: Securing −48 V telecom power feeds against lightning-induced surges and hot-swap transients in base station equipment. IC Role / Device Role / Timing Role: Reverse-polarity configured TVS on negative supply rail to suppress negative-going transients while blocking normal operating current. Use Value: Withstands 40 A non-repetitive forward surge (IFSM), supporting robust front-end protection in distributed power architectures. |
Use Scenario: Adding surge resilience to USB-C PD adapters, wall chargers, and portable electronics DC input jacks exposed to user-handling ESD and cable coupling. IC Role / Device Role / Timing Role: Primary-level TVS mounted adjacent to connector to divert >90% of 10/1000 μs surge energy before it reaches internal DC-DC converters. Use Value: 400 W rating and 87.1 V clamping allow compact placement without heatsinking, reducing BOM count versus multi-stage protection schemes. |
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/H | Same electrical specs and package, but RoHS-compliant commercial grade (E3) without halogen-free certification or AEC-Q101 qualification. | Limited to non-automotive industrial or consumer use where halogen-free and automotive qualification are not mandated. | Select SMAJ54AHE3/H only when AEC-Q101 and halogen-free requirements are waived and cost optimization is prioritized. |
| SMBJ54A-H | Same VWM/VBR/VC, but SMB (DO-214AA) package - 30% larger footprint and higher PPPM (600 W), with RθJA = 85 °C/W. | Better thermal performance and higher surge margin, but requires PCB layout change due to larger pad dimensions and lead spacing. | Choose SMBJ54A-H when system-level surge testing exceeds 400 W or board space allows larger package for enhanced margin. |
Compared with SMAJ54AHM3/H, SMAJ54AHE3/H lacks AEC-Q101 validation and halogen-free status, limiting automotive use, while SMBJ54A-H offers higher surge capacity in a physically larger package - making SMAJ54AHM3/H the optimal balance of automotive compliance, compact size, and verified 400 W protection for space-constrained ECUs and sensor nodes.
Availability
SMAJ54AHM3/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and telecom power input protection requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ54AHM3/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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific performance.
The SMAJ series was engineered specifically for high-reliability transient suppression in automotive, industrial, and communications infrastructure - delivering standardized surge robustness in compact surface-mount packages with AEC-Q101 and RoHS options.
FAQ
What is the clamping voltage of SMAJ54AHM3/H and how is it measured?
The SMAJ54AHM3/H has a maximum clamping voltage (VC) of 87.1 V at 4.6 A peak pulse current (IPPM), tested with a 10/1000 μs waveform per IEC 61000-4-5. This value represents the upper voltage limit imposed on the protected circuit during a standardized surge event, directly measured across the device terminals under specified test conditions - a critical parameter for ensuring downstream components remain within their absolute maximum ratings.
Is SMAJ54AHM3/H qualified for automotive applications?
Yes, SMAJ54AHM3/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet 88390. This qualification covers stress tests including temperature cycling, high-temperature reverse bias (HTRB), and surge endurance - validating its suitability for under-hood and chassis-mounted automotive electronics such as body control modules, ADAS sensors, and infotainment power supplies.
What does the "HM3" suffix mean in SMAJ54AHM3/H?
The "HM3" suffix in SMAJ54AHM3/H indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It denotes matte tin-plated leads meeting J-STD-002 and JESD22-B102 solderability standards, JESD201 Class 2 whisker resistance, and UL 94 V-0 flammability rating - distinguishing it from E3 (RoHS only) and HE3 (AEC-Q101 + RoHS, not halogen-free) variants.
Can SMAJ54AHM3/H be used for bidirectional transient protection?
No, SMAJ54AHM3/H is a unidirectional TVS diode, as indicated by the "A" (not "CA") suffix and cathode band marking. For bidirectional protection, Vishay specifies part numbers ending in "CA" (e.g., SMAJ54CA). Using SMAJ54AHM3/H on AC-coupled or symmetrical signal lines would result in forward conduction during negative transients, potentially damaging the device or failing to protect the circuit.
What is the thermal resistance of SMAJ54AHM3/H and how does it affect layout?
SMAJ54AHM3/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. This value assumes minimal PCB copper; designers must allocate adequate copper area and consider airflow to avoid exceeding the +150 °C maximum junction temperature during repetitive surge events - especially important in enclosed automotive enclosures or high-density industrial modules.
SMAJ54AHM3/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:
- 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/H FAQ
1.How can I place an order for SMAJ54AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ54AHM3/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/H reliable?
The price and inventory of SMAJ54AHM3/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/H is usually 5 days.
3.What payment methods are accepted for SMAJ54AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ54AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ54AHM3/H?
SMAJ54AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ54AHM3/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/H?
For technical support, including SMAJ54AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ54AHM3/H requirements.
6.How does Aetrix verify that SMAJ54AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ54AHM3/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/H meets industry standards.
7.What is the process for return or replacement of SMAJ54AHM3/H?
All SMAJ54AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ54AHM3/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/H part is unused and in its original packaging.
Return procedure for SMAJ54AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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