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Vishay General Semiconductor - Diodes Division SMAJ48CA-M3/61
- Part No.:
- SMAJ48CA-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48CA-M3/61.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,995
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Product details
Overview
SMAJ48CA-M3/61 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection on signal and power lines. It features a 48 V standoff voltage (VWM), 53.3–58.9 V breakdown voltage (VBR) at 1 mA, 77.4 V maximum clamping voltage (VC) at 5.2 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMAJ48CA-M3/61 datasheet, SMAJ48CA-M3/61 pinout, SMAJ48CA-M3/61 application, or SMAJ48CA-M3/61 equivalent, key selection criteria include bidirectional clamping behavior, MSL Level 1 moisture sensitivity, halogen-free RoHS compliance (M3 suffix), and AEC-Q101 qualification readiness via HM3 variant.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional CA construction, enabling suppression of positive and negative transients without polarity dependency. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1.0 μA at VWM), while the low incremental surge resistance supports rapid energy diversion during ESD or lightning-induced surges.
The device is rated for 150 °C maximum junction temperature and exhibits a typical thermal resistance of 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads. Its 10/1000 μs waveform response delivers repeatable clamping performance up to 0.01% duty cycle, with derating applied above 25 °C ambient per Figure 2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 48 V - Maximum continuous reverse operating voltage before significant conduction begins; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 53.3–58.9 V at 1 mA - Confirmed minimum/maximum voltage at which device enters avalanche breakdown; ensures predictable turn-on across production lot. |
| VC (Clamping Voltage) | 77.4 V at IPPM = 5.2 A - Peak voltage seen across protected circuit during 10/1000 μs surge; directly limits stress on downstream ICs like microcontrollers or CAN transceivers. |
| PPPM (Peak Pulse Power) | 400 W - Energy-handling capability under standardized 10/1000 μs transient; sufficient for ISO 7637-2 Pulse 1/2a/2b and IEC 61000-4-5 Level 3 threats. |
| ID (Reverse Leakage) | <1.0 μA at 48 V - Minimal standby current draw; avoids signal integrity degradation or battery drain in always-on sensor nodes. |
| TJ max. | 150 °C - Enables reliable operation in under-hood automotive environments and industrial enclosures without forced cooling. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm length, 4.50 mm width, and 2.29 mm height; compatible with automated pick-and-place and reflow soldering. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1 compliant (peak reflow ≤ 260 °C). Bidirectional construction means no polarity marking; terminals are symmetrical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient current path (bidirectional) | Either terminal serves as input/output for surge current; no cathode band marking required - simplifies PCB layout and eliminates orientation errors during assembly. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables single-device protection against severe automotive load dump and inductive switching events without cascaded TVS stages. |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes voltage overshoot during clamping - critical for safeguarding 5 V or 3.3 V logic interfaces with tight absolute maximum ratings. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for global OEMs and industrial equipment without compromising surge robustness. |
| MSL Level 1, 260 °C peak reflow | Eliminates pre-baking requirement and supports standard lead-free reflow profiles - reduces manufacturing cost and process complexity. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage parameters across temperature and lifetime, essential for automotive and industrial field reliability. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting analog output lines (e.g., 4–20 mA current loops) and LIN bus interfaces in engine control modules from load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across signal line and ground to shunt transient energy before it reaches precision DAC or op-amp circuitry. Use Value: Prevents latch-up or permanent damage to 12-bit ADC drivers by limiting transient voltage to ≤77.4 V during 100 V/50 ms load dump events. |
Use Scenario: Safeguarding digital input channels on programmable logic controllers exposed to relay coil flyback and motor drive noise in factory automation cabinets. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected between isolated input terminal and system ground to absorb repetitive 600 V/40 A surges from inductive switching. Use Value: Maintains functional safety integrity by ensuring <1 μA leakage at 48 V nominal supply, avoiding false triggering of 24 V DC input detection circuits. |
| Telecom Line Interface | Consumer Appliance Motor Control |
|
Use Scenario: Shielding RS-485 transceiver pins (A/B) in base station backhaul units from induced lightning surges on outdoor cabling. IC Role / Device Role / Timing Role: Differential-mode TVS pair (one per line) referenced to common ground, providing symmetrical clamping for ±15 kV ESD and 1 kV ring wave transients. Use Value: Achieves IEC 61000-4-5 Level 3 compliance (1 kV line-earth) with VC ≤ 77.4 V - preserving signal eye diagram integrity at 10 Mbps data rates. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in smart washing machines and HVAC blowers connected to MCU GPIOs. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp across motor terminals and MCU sense resistors to prevent voltage reversal and gate driver overvoltage. Use Value: Withstands 40 A non-repetitive forward surge (IFSM), enabling direct placement across motor windings without series fusing in Class II appliances. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48CA-E3/61 | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs M3); no AEC-Q101 qualification path. | Preferred for commercial-grade consumer electronics where halogen content is unrestricted and automotive qualification is unnecessary. | Select E3 when cost sensitivity outweighs halogen-free requirement and AEC-Q101 is not mandated. |
| SMAJ48CAHM3_A/H | Identical electrical and mechanical specs; adds AEC-Q101 qualification (HM3 suffix) and 7" tape/reel packaging (H code). | Required for automotive front-end modules, ADAS sensors, or any application requiring certified component reliability per JESD22-A108. | Choose HM3 when automotive qualification, traceable lot control, and smaller reel size are mandatory for Tier 1 supply chain compliance. |
Compared with SMAJ48CA-E3/61, the SMAJ48CA-M3/61 provides halogen-free compliance without sacrificing surge rating or thermal performance; versus SMAJ48CAHM3_A/H, it omits AEC-Q101 validation but retains identical clamping behavior and packaging compatibility - making it ideal for industrial and high-reliability commercial designs needing environmental compliance without automotive certification overhead.
Availability
SMAJ48CA-M3/61 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O protection, telecom line interfaces, and consumer appliance motor control requiring stable component supply and halogen-free compliance.
Supply support for SMAJ48CA-M3/61 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, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness against ESD, EFT, and surge events is non-negotiable.
FAQ
What is the clamping voltage of SMAJ48CA-M3/61 at its rated peak pulse current?
The SMAJ48CA-M3/61 has a maximum clamping voltage (VC) of 77.4 V at 5.2 A peak pulse current (IPPM), measured under the standard 10/1000 μs waveform. This value is guaranteed across temperature and production lots, and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring compatibility with 5 V or 3.3 V logic interfaces downstream of the SMAJ48CA-M3/61.
Is SMAJ48CA-M3/61 suitable for automotive applications?
The SMAJ48CA-M3/61 itself is not AEC-Q101 qualified, but it shares identical electrical and mechanical specifications with the AEC-Q101-qualified SMAJ48CAHM3_A/H variant. Its halogen-free (M3) construction, 150 °C TJ max., and robust 400 W surge rating make it suitable for non-safety-critical automotive subsystems such as body control modules and infotainment power rails - provided full qualification is confirmed per program requirements.
How does the bidirectional design of SMAJ48CA-M3/61 affect PCB layout?
The bidirectional CA configuration of SMAJ48CA-M3/61 eliminates polarity marking - there is no cathode band, and either terminal functions identically. This allows symmetrical placement across differential lines or unidirectional rails without orientation constraints, reducing assembly errors and enabling compact routing in space-constrained layouts like automotive sensor PCBs where SMAJ48CA-M3/61 is commonly deployed.
What is the thermal resistance of SMAJ48CA-M3/61, and how does it impact power dissipation?
SMAJ48CA-M3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads. At its rated 3.3 W steady-state power dissipation (PD), this yields ~396 °C temperature rise - confirming that PD applies only under infinite heatsink conditions. In real-world layouts, derating is required; the SMAJ48CA-M3/61 relies on short-duration surge handling rather than continuous power dissipation.
Does SMAJ48CA-M3/61 meet moisture sensitivity level (MSL) requirements for lead-free reflow?
Yes, SMAJ48CA-M3/61 meets MSL Level 1 per J-STD-020, with a maximum peak reflow temperature of 260 °C. This eliminates the need for baking prior to assembly and supports compatibility with standard lead-free reflow profiles - a key advantage for high-volume manufacturing of industrial controls and automotive ECUs where SMAJ48CA-M3/61 is routinely used for board-level surge protection.
SMAJ48CA-M3/61 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-M3/61 FAQ
1.How can I place an order for SMAJ48CA-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48CA-M3/61 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-M3/61 reliable?
The price and inventory of SMAJ48CA-M3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ48CA-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ48CA-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48CA-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48CA-M3/61?
SMAJ48CA-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48CA-M3/61 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-M3/61?
For technical support, including SMAJ48CA-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48CA-M3/61 requirements.
6.How does Aetrix verify that SMAJ48CA-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ48CA-M3/61 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-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ48CA-M3/61?
All SMAJ48CA-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48CA-M3/61, 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-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ48CA-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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