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Vishay General Semiconductor - Diodes Division SMAJ48A-M3/5A
- Part No.:
- SMAJ48A-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48A-M3/5A.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ48A-M3/5A 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 48 V standoff voltage (VWM), 53.3–58.9 V breakdown range at 1 mA, clamps transients to ≤77.4 V at 5.2 A peak pulse current, and delivers 400 W peak pulse power (10/1000 μs waveform) - ideal for safeguarding MOSFETs, ICs, and sensor signal lines in industrial power supplies and automotive control modules.
For engineers reviewing the SMAJ48A-M3/5A datasheet, SMAJ48A-M3/5A pinout, SMAJ48A-M3/5A application, or SMAJ48A-M3/5A equivalent, key selection criteria include its unidirectional polarity, SMA (DO-214AC) package compatibility with automated placement, AEC-Q101 qualification eligibility (via HM3 suffix), low 0.103 %/°C VBR temperature coefficient, and compliance with UL 497B surge protector classification.
Technical Context
This TVS diode operates as a clamping device that remains high-impedance below 48 V and rapidly transitions to low-impedance conduction above its 53.3–58.9 V breakdown threshold, limiting transient energy to protected circuits. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and repeatable clamping performance under repetitive surges.
Rated for -55 °C to +150 °C junction operation, it exhibits 120 °C/W junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads and supports 40 A non-repetitive forward surge current (8.3 ms half-sine), making it suitable for both DC rail and signal-line protection where fast response (<1 ns) and low incremental surge resistance are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC bias margin. |
| VBR (min/max) | 53.3 V / 58.9 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on during transients without premature conduction. |
| VC @ IPPM | ≤77.4 V at 5.2 A - Clamping voltage under 400 W 10/1000 μs surge; determines maximum stress on downstream components. |
| PPPM | 400 W - Peak pulse power handling capability; enables protection against IEC 61000-4-5 Level 3/4 surges when properly mounted. |
| IFSM | 40 A - Single half-sine surge rating (8.3 ms); supports motor drive and relay coil suppression applications. |
| TJ max | +150 °C - Maximum junction temperature; allows operation in under-hood automotive or high-ambient industrial environments. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 0.208" length and matte tin-plated leads compliant with J-STD-002 solderability. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with glass-passivated chip junction, UL 94 V-0 rated compound, cathode indicated by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to circuit ground or lower-potential node; defines current path during clamping. |
| Cathode | Reverse-biased terminal (marked with band) | Connected to protected line (e.g., 48 V rail); conducts avalanche current when transient exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against lightning-induced surges and inductive switching spikes in 48 V systems. |
| Low 0.103 %/°C VBR tempco | Minimizes drift in clamping threshold across automotive (-40 °C to +125 °C) and industrial temperature ranges. |
| MSL Level 1 (260 °C reflow) | Supports lead-free SMT assembly without moisture sensitivity concerns or pre-bake requirements. |
| Halogen-free, RoHS-compliant (M3 suffix) | Fulfills environmental compliance mandates for export to EU, China, and other regulated markets. |
| AEC-Q101 qualification path (HM3 variant) | Provides documented reliability pathway for automotive body electronics and powertrain auxiliary circuits. |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Protecting 48 V DC input rails in programmable logic controllers (PLCs) and motor drives from load dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between input rail and chassis ground to shunt transient energy before it reaches DC-DC converters or microcontrollers. Use Value: Limits voltage excursion to ≤77.4 V during 400 W surges, preventing latch-up or gate oxide damage in downstream 60 V-rated MOSFETs and regulators. |
Use Scenario: Safeguarding LIN bus transceivers and window lift motor drivers in BCMs exposed to battery voltage transients. IC Role / Device Role / Timing Role: Standoff-rated TVS on 48 V supply line upstream of local regulators, activated within <1 ns to suppress ISO 7637-2 Pulse 1/2a/5a events. Use Value: Maintains system uptime by preventing reset faults or permanent damage during cold-crank or alternator load dump conditions. |
| Telecom Remote Radio Unit (RRU) | Consumer Smart Home Hub Power Input |
|
Use Scenario: Shielding 48 V PoE++ (IEEE 802.3bt) inputs in outdoor RRU enclosures from lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: First-stage clamping device in multi-tier protection scheme, coordinated with GDT and MOV to handle high-energy threats. Use Value: Absorbs initial 400 W surge energy while preserving low-capacitance signal integrity for RF front-end components. |
Use Scenario: Securing USB-C PD 48 V input on smart home hubs against ESD and accidental AC adapter misconnection. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power rail, sized to survive repeated 8 kV contact ESD per IEC 61000-4-2 without degradation. Use Value: Eliminates field returns due to power-related failures while meeting UL 62368-1 surge immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48A-E3/5A | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs M3). | Preferred for commercial-grade applications where halogen-free material is not mandated. | Select E3 for cost-sensitive non-automotive designs; M3 required for halogen-free compliance programs. |
| SMBJ48A-M3 | Higher 600 W PPPM, larger SMB (DO-214AA) package, same VWM/VC ratings. | Better suited for higher-energy threats (e.g., IEC 61000-4-5 Level 4) where board space permits larger footprint. | Choose SMBJ48A-M3 when surge threat level exceeds 400 W or thermal dissipation requires lower RθJA. |
Compared with SMAJ48A-M3/5A, the E3 variant offers identical protection performance at lower material cost but lacks halogen-free certification, while the SMBJ48A-M3 provides 50 % higher surge capacity in a physically larger package - enabling design flexibility for varying threat severity and layout constraints.
Availability
SMAJ48A-M3/5A is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, telecom remote radio units, and consumer smart home hubs requiring stable component supply with full traceability and lifecycle management.
Supply support for SMAJ48A-M3/5A 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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was engineered for high-reliability transient suppression in space-constrained surface-mount applications, targeting automotive, industrial, and telecom sectors where consistent clamping performance and AEC-Q101 readiness are essential.
FAQ
What is the maximum clamping voltage of the SMAJ48A-M3/5A under a 400 W surge?
The SMAJ48A-M3/5A clamps to a maximum of 77.4 V at its rated peak pulse current of 5.2 A (10/1000 μs waveform). This value is measured and guaranteed per the Vishay datasheet (Document Number: 88390, Rev. 09-Jan-2024) and defines the upper voltage limit imposed on protected circuitry during transient events. The SMAJ48A-M3/5A maintains this clamping performance across its specified operating temperature range.
Is the SMAJ48A-M3/5A suitable for automotive applications?
The SMAJ48A-M3/5A itself is commercial-grade, but the HM3 variant (e.g., SMAJ48AHM3_A/I) is AEC-Q101 qualified for automotive use. The M3 suffix indicates halogen-free, RoHS-compliant construction, and the underlying SMAJ platform supports automotive qualification paths. For production automotive designs, specify the HM3 version of SMAJ48A-M3/5A to ensure compliance with AEC-Q101 stress testing requirements.
What does the "/5A" in SMAJ48A-M3/5A indicate?
The "/5A" denotes the preferred packaging configuration: 13-inch diameter plastic tape and reel containing 7500 units. This contrasts with "/61", which specifies a 7-inch reel with 1800 units. The "5A" code aligns with Vishay's ordering nomenclature for high-volume SMT assembly and is independent of electrical specifications - the SMAJ48A-M3/5A and SMAJ48A-M3/61 share identical electrical and thermal characteristics.
How does the SMAJ48A-M3/5A compare to bidirectional TVS diodes like SMAJ48CA?
The SMAJ48A-M3/5A is unidirectional and intended for DC line protection with defined polarity (cathode marked), whereas SMAJ48CA is bidirectional and used in AC or floating signal lines. Their standoff (48 V), breakdown (53.3–58.9 V), and clamping (77.4 V) voltages are identical, but SMAJ48A-M3/5A supports forward conduction and is optimized for single-polarity rails. Select SMAJ48A-M3/5A for 48 V DC inputs; choose SMAJ48CA only when symmetrical surge suppression on differential or AC-coupled paths is required.
What is the thermal resistance of the SMAJ48A-M3/5A, and how does it affect layout?
The SMAJ48A-M3/5A 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 minimum recommended pad layout per Vishay's datasheet. To maintain safe junction temperatures under repetitive surges, PCB layout must provide adequate copper area and avoid excessive trace length - undersized pads will elevate RθJA and risk thermal runaway. The SMAJ48A-M3/5A also exhibits 30 °C/W junction-to-lead resistance, supporting localized heat sinking via wide traces.
SMAJ48A-M3/5A 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):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 5.2A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ48A-M3/5A FAQ
1.How can I place an order for SMAJ48A-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48A-M3/5A 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 SMAJ48A-M3/5A reliable?
The price and inventory of SMAJ48A-M3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ48A-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ48A-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48A-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48A-M3/5A?
SMAJ48A-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48A-M3/5A 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 SMAJ48A-M3/5A?
For technical support, including SMAJ48A-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48A-M3/5A requirements.
6.How does Aetrix verify that SMAJ48A-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ48A-M3/5A 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 SMAJ48A-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ48A-M3/5A?
All SMAJ48A-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48A-M3/5A, 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 SMAJ48A-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ48A-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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