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Vishay General Semiconductor - Diodes Division SMAJ48CA-E3/61
- Part No.:
- SMAJ48CA-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48CA-E3/61.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,228
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Product details
Overview
SMAJ48CA-E3/61 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 48 V stand-off 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 protection and industrial I/O interfaces.
For engineers reviewing the SMAJ48CA-E3/61 datasheet, SMAJ48CA-E3/61 pinout, SMAJ48CA-E3/61 application, or SMAJ48CA-E3/61 equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification eligibility (via HE3 suffix variants), low incremental surge resistance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional CA construction, enabling protection of AC-coupled or floating signal paths without polarity concerns. Its glass-passivated junction ensures stable breakdown behavior and fast response time (<1 ns), while the SMA package supports high thermal dissipation via low RθJL (30 °C/W) and meets MSL Level 1 reflow requirements (peak 260 °C).
The device delivers 400 W peak pulse power up to 78 V; above that threshold, derated to 300 W per specification. Clamping performance is validated under standardized 10/1000 μs surge waveforms with ≤50 ms pulse test duration, and leakage remains ≤1.0 μA at VWM - critical for low-power sensor front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 48 V nominal systems. |
| VBR min/max | 53.3 V / 58.9 V at 1 mA - Confirmed breakdown range ensures reliable turn-on during transients without premature conduction. |
| VC @ IPPM | 77.4 V at 5.2 A - Clamping voltage limits downstream IC stress during 10/1000 μs surges; enables robust protection of 48 V rail components. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak surge energy handling capacity determines survivability against ISO 7637-2 Pulse 1/2a/5a events. |
| ID @ VWM | ≤1.0 μA - Ultra-low leakage preserves battery life and signal integrity in always-on sensor nodes and low-current control circuits. |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and industrial enclosures with elevated ambient temperatures. |
| Package | SMA (DO-214AC) - Surface-mount outline with 0.208" × 0.157" footprint; compatible with standard pick-and-place and reflow processes. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, MSL Level 1 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked end) | Not applicable - bidirectional device | No polarity marking; terminals are functionally identical; either lead may connect to protected line or ground reference. |
| Anode (unmarked end) | Not applicable - bidirectional device | Same as cathode; symmetrical structure eliminates orientation constraints during PCB layout and assembly. |
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 planning. |
| 400 W peak pulse power | Withstands automotive load-dump and inductive switching surges per ISO 7637-2 without degradation when mounted on 5 mm × 5 mm copper pads. |
| Glass-passivated junction | Ensures stable VBR over temperature and lifetime, minimizing parameter drift in harsh industrial or automotive environments. |
| AEC-Q101 qualification path | HE3/HM3 suffix variants are qualified for automotive applications; E3/61 version shares identical die and construction for design continuity. |
| Low-profile SMT package | SMA footprint allows high-density placement near connectors or ICs, reducing trace inductance and improving transient suppression efficacy. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ESD in engine control modules. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between signal line and chassis ground, responding within <1 ns to limit transient excursions. Use Value: Prevents latch-up or permanent damage to 48 V-rated sensor interface ICs by clamping surges to ≤77.4 V while maintaining <1 μA leakage at 48 V. |
Use Scenario: Safeguarding digital input channels on programmable logic controllers exposed to relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Parallel-connected TVS across input terminals to shunt induced transients before they reach optocoupler or microcontroller input pins. Use Value: Enables reliable operation in factory automation environments where repetitive 400 W surges occur, supported by 150 °C junction rating and 30 °C/W junction-to-lead thermal resistance. |
| Telecom Power Rail Protection | Consumer Device USB Port Protection |
Use Scenario: Securing 48 V phantom power lines in VoIP phones and PoE-powered equipment against lightning-induced surges on Ethernet cables. IC Role / Device Role / Timing Role: Primary clamping device on DC input rail upstream of DC-DC converters, coordinated with upstream fuses or PTCs. Use Value: Maintains system uptime by absorbing 10/1000 μs transients up to 5.2 A without failure, verified per ANSI/IEEE C62.35 standards. |
Use Scenario: Adding secondary-level surge immunity to USB Type-C ports in smart home hubs handling external 48 V PoE accessories. IC Role / Device Role / Timing Role: Low-capacitance (typ. <100 pF at 0 V) bidirectional clamp across VBUS and GND to suppress ESD and conducted noise. Use Value: Preserves USB 2.0 signal integrity while providing ±15 kV contact ESD protection, enabled by fast response and symmetrical clamping behavior. |
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-E3/61 | Unidirectional variant; cathode-marked; VF = 3.5 V at 25 A forward current. | Requires correct polarity placement; unsuitable for AC or floating lines. | Select only when protecting DC rails with known polarity and where forward conduction must be minimized. |
| SMBJ48CA-E3/52 | Same VWM/VBR/VC specs but in larger SMB (DO-214AA) package; 600 W PPPM rating. | Higher power handling but 30 % larger footprint; requires revised pad layout. | Choose when higher surge margin is needed and board space permits larger package; not drop-in compatible. |
Compared with SMAJ48CA-E3/61, the unidirectional SMAJ48A-E3/61 demands strict polarity alignment and lacks AC-line suitability, while the SMBJ48CA-E3/52 offers greater surge capacity at the cost of PCB area and layout change - making SMAJ48CA-E3/61 optimal for space-constrained bidirectional 48 V protection.
Availability
SMAJ48CA-E3/61 is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, telecom power supplies, and consumer PoE accessories requiring stable component supply and RoHS-compliant manufacturing.
Supply support for SMAJ48CA-E3/61 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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series targets board-level transient protection in automotive, industrial, and communications systems, delivering standardized TVS performance in compact surface-mount packages for high-volume automated assembly.
FAQ
What is the clamping voltage of SMAJ48CA-E3/61 under a 10/1000 μs surge?
The SMAJ48CA-E3/61 clamps to a maximum of 77.4 V when subjected to its rated peak pulse current of 5.2 A with a 10/1000 μs waveform. This value is measured per standard test conditions (TA = 25 °C, mounted on 0.2" × 0.2" copper pads) and defines the upper voltage limit imposed on protected circuitry during transient events. The SMAJ48CA-E3/61 maintains this clamping performance consistently across its operational temperature range.
Is SMAJ48CA-E3/61 suitable for automotive applications?
SMAJ48CA-E3/61 uses the same die and construction as AEC-Q101-qualified variants (e.g., SMAJ48CAHE3_A); while the E3/61 suffix denotes commercial-grade RoHS compliance, its electrical and thermal specifications - including 150 °C TJ max, glass-passivated junction, and MSL Level 1 rating - fully align with automotive environmental requirements. For certified use, specify HE3-suffix parts; SMAJ48CA-E3/61 serves as a direct design-in precursor.
How does the bidirectional design of SMAJ48CA-E3/61 affect PCB layout?
The SMAJ48CA-E3/61 has no polarity marking and functions identically in both directions, eliminating orientation constraints during placement. Engineers can route either terminal to the protected line and the other to ground without functional impact - simplifying layout, reducing assembly errors, and enabling reuse across differential or floating interfaces. This symmetry is confirmed in Vishay's documentation for all CA-suffix SMAJ devices.
What is the maximum leakage current of SMAJ48CA-E3/61 at its stand-off voltage?
At its 48 V stand-off voltage (VWM), the SMAJ48CA-E3/61 exhibits a maximum reverse leakage current (ID) of 1.0 μA at 25 °C. This ultra-low leakage ensures minimal power loss in battery-backed or energy-sensitive systems and prevents false triggering in high-impedance sensing circuits. The SMAJ48CA-E3/61 maintains this specification across its full operating temperature range per datasheet testing.
Does SMAJ48CA-E3/61 require heatsinking for 400 W surge handling?
No external heatsink is required for single-event 400 W surge handling, as the SMAJ48CA-E3/61 relies on short-duration thermal mass rather than steady-state dissipation. Its 120 °C/W junction-to-ambient thermal resistance applies to DC conditions; transient energy is absorbed within the silicon junction during the sub-millisecond pulse. Mounting on minimum 0.2" × 0.2" copper pads per Vishay's recommendation ensures adequate heat spreading for repetitive surges.
SMAJ48CA-E3/61 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-E3/61 FAQ
1.How can I place an order for SMAJ48CA-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48CA-E3/61 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-E3/61 reliable?
The price and inventory of SMAJ48CA-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ48CA-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ48CA-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48CA-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48CA-E3/61?
SMAJ48CA-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48CA-E3/61 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-E3/61?
For technical support, including SMAJ48CA-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48CA-E3/61 requirements.
6.How does Aetrix verify that SMAJ48CA-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ48CA-E3/61 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-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ48CA-E3/61?
All SMAJ48CA-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48CA-E3/61, 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-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ48CA-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ48CA-E3/61 Tags
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