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Vishay General Semiconductor - Diodes Division SMAJ48CA-M3/5A
- Part No.:
- SMAJ48CA-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48CA-M3/5A.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,484
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Product details
Overview
SMAJ48CA-M3/5A 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 48 V stand-off voltage (VWM), 53.3–58.9 V breakdown voltage (VBR) at 1 mA, and clamps to ≤77.4 V at 5.2 A peak pulse current under 10/1000 μs waveform - protecting MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ48CA-M3/5A datasheet, SMAJ48CA-M3/5A pinout, SMAJ48CA-M3/5A application, or SMAJ48CA-M3/5A equivalent, key selection criteria include bidirectional clamping capability, 400 W peak pulse power rating (at ≤78 V), low incremental surge resistance, AEC-Q101 qualification eligibility (via HM3 suffix), and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional CA construction, enabling protection of AC-coupled or differential signal lines without polarity concerns. Its glass-passivated junction ensures stable breakdown behavior and fast response (<1 ns) to ESD and lightning-induced surges.
Thermal performance is defined by RθJA = 120 °C/W and RθJL = 30 °C/W, with maximum junction temperature rated at +150 °C. The device sustains 400 W peak pulse power (10/1000 μs) when mounted on 0.2" × 0.2" copper pads - derating linearly above TA = 25 °C per Figure 2 in the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 53.3 V / 58.9 V at IT = 1 mA - guaranteed breakdown range defining turn-on threshold |
| VC @ IPPM | ≤77.4 V at 5.2 A - clamped voltage during 10/1000 μs transient, limiting stress on downstream components |
| PPPM | 400 W - peak pulse power handling capacity for non-repetitive transients up to 0.01% duty cycle |
| ID @ VWM | ≤1.0 μA - ultra-low leakage ensuring minimal standby power loss and signal integrity |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 5.28 mm length and 2.29 mm height |
| Operating TJ | -55 °C to +150 °C - wide temperature range supporting under-hood automotive and industrial environments |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; meets UL 94 V-0, J-STD-002 solderability, and JESD 201 Class 2 whisker resistance. Bidirectional construction means no polarity marking - both terminals are electrically symmetrical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals serve as interchangeable surge current entry/exit points; no cathode band marking required for bidirectional operation |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), or ungrounded power rails without polarity constraints |
| 400 W peak pulse power | Withstands high-energy transients such as ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 4 surges when properly laid out |
| Low clamping ratio (VC/VBR ≈ 1.36) | Minimizes overvoltage overshoot during clamping, reducing risk of latch-up or gate oxide damage in protected MOSFETs/ICs |
| Halogen-free & RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for automotive and industrial OEMs without compromising surge robustness |
| MSL Level 1 (260 °C peak reflow) | Supports lead-free reflow soldering without moisture sensitivity concerns or baking requirements |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 48 V battery-supplied ECUs against load dump and alternator transients. IC Role / Device Role / Timing Role: Primary clamping element placed at power input stage before DC-DC converters and microcontrollers. Use Value: Limits voltage to ≤77.4 V during 400 W surges, preventing damage to 60 V-rated input stages and meeting ISO 16750-2 requirements. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops) in PLC modules exposed to field wiring faults. IC Role / Device Role / Timing Role: Bidirectional shunt clamp across signal pair to suppress common-mode and differential-mode transients. Use Value: Symmetric clamping ensures equal protection regardless of fault polarity; <1 μA leakage preserves loop accuracy. |
| Telecom Data Line Surge Suppression | Consumer Appliance Motor Drive Protection |
|
Use Scenario: Shielding Ethernet PHY interface pins from ESD and induced surges in outdoor network equipment. IC Role / Device Role / Timing Role: Secondary-level TVS placed after common-mode chokes to handle residual differential surges. Use Value: Fast <1 ns response captures ESD events before IC input structures fail; SMA footprint enables dense layout near connectors. |
Use Scenario: Suppressing inductive kickback from brushed DC motors in smart home appliances. IC Role / Device Role / Timing Role: Across motor terminals to clamp flyback voltage spikes generated during PWM switching. Use Value: 400 W rating handles repetitive commutation spikes; bidirectional operation accommodates reversal during braking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48CA-E3/5A | Same electrical specs; RoHS-compliant but contains brominated flame retardants (non-halogen-free) | Acceptable for commercial-grade designs where halogen-free material is not mandated | Select when cost sensitivity outweighs halogen-free requirement and AEC-Q101 is not needed |
| SMAJ48CAHM3_A/I | Identical M3 halogen-free construction; packaged in 13" tape-and-reel (7500 pcs) with AEC-Q101 qualification | Required for automotive Tier 1 supply chains mandating AEC-Q101 and full traceability | Choose for automotive production programs needing qualified parts and larger reels |
Compared with SMAJ48CA-M3/5A, the E3 variant trades halogen-free status for lower unit cost in commercial applications, while the HM3_A/I variant adds AEC-Q101 qualification and larger reel packaging - making it suitable for automotive volume production but less optimal for prototyping or low-volume industrial use.
Availability
SMAJ48CA-M3/5A is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor module development, and telecom infrastructure projects requiring stable component supply with consistent M3 halogen-free compliance and commercial-grade reliability.
Supply support for SMAJ48CA-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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was developed for robust, surface-mount transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where compact size, high surge immunity, and long-term stability are critical.
FAQ
What is the clamping voltage of SMAJ48CA-M3/5A at its rated peak pulse current?
The SMAJ48CA-M3/5A clamps to a maximum of 77.4 V when subjected to its specified peak pulse current of 5.2 A under the standard 10/1000 μs waveform. This value is measured at the device terminals and defines the upper voltage limit imposed on protected circuitry during surge events - a critical parameter for ensuring downstream ICs and MOSFETs remain within safe operating voltage margins. The SMAJ48CA-M3/5A achieves this with a clamping ratio of approximately 1.36 relative to its minimum breakdown voltage.
Is SMAJ48CA-M3/5A suitable for automotive applications requiring AEC-Q101 qualification?
The SMAJ48CA-M3/5A itself is not AEC-Q101 qualified; however, Vishay offers the functionally identical SMAJ48CAHM3_A/I variant with full AEC-Q101 qualification, same M3 halogen-free construction, and identical electrical specifications. For automotive production, designers must specify the HM3_A/I suffix to ensure qualification compliance - the SMAJ48CA-M3/5A remains appropriate for commercial and industrial applications where AEC-Q101 is not mandated.
How does the bidirectional nature of SMAJ48CA-M3/5A affect its placement in circuit design?
Because SMAJ48CA-M3/5A is bidirectional, it has no polarity marking and can be placed across any two nodes requiring symmetrical overvoltage protection - such as differential signal pairs (RS-485, CAN), AC power inputs, or ungrounded DC rails. Unlike unidirectional TVS diodes, it eliminates orientation errors during assembly and avoids the need for dual-diode configurations. This simplifies layout and reduces BOM count while maintaining full protection in both voltage polarities - a key advantage reflected in the SMAJ48CA-M3/5A's design.
What is the thermal resistance profile of SMAJ48CA-M3/5A, and how does it impact PCB layout?
The SMAJ48CA-M3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W when mounted on the recommended 0.2" × 0.2" copper pads per terminal. To maintain safe junction temperatures under repeated surges, PCB layout must provide adequate copper area and minimize trace length between the SMAJ48CA-M3/5A and ground/power planes. Insufficient copper will cause premature thermal derating - directly impacting the SMAJ48CA-M3/5A's ability to sustain its rated 400 W pulse power.
Does SMAJ48CA-M3/5A meet lead-free reflow requirements, and what is its MSL rating?
Yes, SMAJ48CA-M3/5A meets lead-free reflow requirements with an MSL Level 1 rating per J-STD-020, allowing peak reflow temperatures up to 260 °C without preconditioning or baking. Its matte tin-plated leads comply with J-STD-002 and JESD 22-B102 solderability standards, and the molding compound satisfies UL 94 V-0 flammability. This makes the SMAJ48CA-M3/5A compatible with standard high-volume SMT assembly lines - a key enabler for reliable, scalable manufacturing of the SMAJ48CA-M3/5A.
SMAJ48CA-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:
- -
- Bidirectional Channels:
- 1
- 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)
SMAJ48CA-M3/5A FAQ
1.How can I place an order for SMAJ48CA-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48CA-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 SMAJ48CA-M3/5A reliable?
The price and inventory of SMAJ48CA-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 SMAJ48CA-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ48CA-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48CA-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48CA-M3/5A?
SMAJ48CA-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48CA-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 SMAJ48CA-M3/5A?
For technical support, including SMAJ48CA-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48CA-M3/5A requirements.
6.How does Aetrix verify that SMAJ48CA-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ48CA-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 SMAJ48CA-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ48CA-M3/5A?
All SMAJ48CA-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48CA-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 SMAJ48CA-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ48CA-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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