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Vishay General Semiconductor - Diodes Division SMAJ48A-E3/61
- Part No.:
- SMAJ48A-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48A-E3/61.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ48A-E3/61 from Vishay General Semiconductor is a unidirectional 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 voltage (VBR) at 1 mA, and clamps transients to ≤77.4 V at 5.2 A peak pulse current (IPPM), delivering 400 W peak pulse power (10/1000 μs waveform) on standard PCB pads. It is widely deployed in automotive power supply rails, industrial sensor interfaces, and DC-DC converter input stages.
For engineers reviewing the SMAJ48A-E3/61 datasheet, SMAJ48A-E3/61 pinout, SMAJ48A-E3/61 application, or SMAJ48A-E3/61 equivalent, key selection criteria include its unidirectional polarity, SMA (DO-214AC) surface-mount package, AEC-Q101 qualification eligibility (via HE3 suffix), low clamping ratio (VC/VBR ≈ 1.35), and compliance with UL 497B surge protector standards.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, entering avalanche conduction when reverse voltage exceeds VBR. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at 48 V), while its low incremental surge resistance enables rapid energy dissipation during ESD or lightning-induced transients.
The SMAJ48A-E3/61 is rated for -55 °C to +150 °C operating junction temperature, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead). Its 10/1000 μs waveform rating assumes mounting on 0.2" × 0.2" copper pads - derating applies above 25 °C ambient per Figure 2 in the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before significant leakage; defines upper limit of normal circuit operation. |
| VBR (min/max) | 53.3 V / 58.9 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on margin above VWM. |
| VC @ IPPM | ≤77.4 V at 5.2 A - Clamped voltage seen by protected IC/MOSFET during 400 W transient; determines maximum stress on downstream components. |
| PPPM | 400 W (10/1000 μs) - Peak surge power handling capability; validated with 0.01% duty cycle repetitive testing. |
| IFSM | 40 A - Single half-sine surge current rating (8.3 ms), critical for inductive load switching events in automotive power circuits. |
| TJ max | +150 °C - Maximum junction temperature; supports under-hood automotive and high-temperature industrial 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 placement. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by band marking; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line (e.g., 48 V rail); conducts avalanche current to ground during overvoltage events. |
| Anode (unbanded end) | Reference/ground return path | Typically tied to system ground or low-impedance return plane; completes clamping current path during surge. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 surges without external heat sinking. |
| Low clamping voltage (77.4 V @ 5.2 A) | Provides 29.4 V headroom below typical 100 V automotive load-dump thresholds, safeguarding 60 V-rated MOSFETs and controllers. |
| Glass passivated junction | Ensures stable VBR tolerance (±5%), low leakage (<1 μA), and long-term reliability under thermal cycling. |
| MSL Level 1 (260 °C peak reflow) | Supports lead-free SMT assembly without moisture sensitivity concerns or baking requirements. |
| UL 497B recognized (QVGQ2) | Validates suitability for telecom and industrial signal-line protection where regulatory certification is mandatory. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 48 V battery-fed ECUs against load dump and alternator ripple in commercial vehicles. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between battery rail and DC-DC input stage. Use Value: Limits transient voltage to ≤77.4 V, preventing damage to 60 V input-rated buck controllers and gate drivers. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events in factory automation. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF) TVS shunting transients on 0–10 V or 4–20 mA signal lines. Use Value: Sub-1 ns response time clamps fast ESD pulses before they reach precision ADC front-ends or op-amp buffers. |
| Telecom DC Power Input Protection | Consumer DC Adapter Output Protection |
Use Scenario: Safeguarding PoE-powered equipment inputs against induced surges on outdoor Ethernet cables. IC Role / Device Role / Timing Role: Primary-level TVS on 48 V DC input before isolation transformer or DC-DC stage. Use Value: Withstands 400 W surges per IEEE 802.3bt requirements while maintaining <1 μA leakage at nominal 48 V. |
Use Scenario: Preventing damage to USB-C PD or laptop adapter outputs due to accidental short-circuit transients. IC Role / Device Role / Timing Role: Output-side TVS absorbing inductive kickback from output capacitor ESR during hot-plug events. Use Value: 40 A single-pulse surge rating handles worst-case inrush into shorted loads without degradation. |
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 | Bidirectional variant; symmetric VBR (53.3–58.9 V) in both polarities; same VC, PPPM, and package. | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where polarity reversal may occur. | Select SMAJ48CA-E3/61 only if bidirectional clamping is needed; SMAJ48A-E3/61 is optimal for DC rails with defined polarity. |
| SMBJ48A-E3/52 | Same VWM/VBR/VC specs but in SMB (DO-214AA) package; 400 W rating, higher IPPM (6.4 A), lower RθJA (90 °C/W). | Better thermal performance and surge margin; requires larger PCB footprint (4.58 mm × 3.94 mm vs. SMA's 4.50 mm × 2.29 mm). | Choose SMBJ48A-E3/52 when higher surge endurance or improved thermal management is required; SMAJ48A-E3/61 preferred for space-constrained layouts. |
Compared with SMAJ48CA-E3/61 and SMBJ48A-E3/52, the SMAJ48A-E3/61 offers optimal balance of compact SMA footprint, unidirectional precision, and AEC-Q101-ready RoHS compliance - making it ideal for cost-sensitive, volume automotive and industrial DC protection where polarity is fixed and board area is constrained.
Availability
SMAJ48A-E3/61 is available at Aetrix Electronics and suitable for automotive power distribution modules, industrial PLC I/O protection, and telecom DC power supplies requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ48A-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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness against ESD, lightning, and load-dump events is non-negotiable.
FAQ
What is the maximum clamping voltage of the SMAJ48A-E3/61 under surge conditions?
The SMAJ48A-E3/61 clamps to a maximum of 77.4 V when subjected to its rated peak pulse current of 5.2 A (10/1000 μs waveform). This value is measured at the device terminals under standardized test conditions with 0.2" × 0.2" copper pads and represents the highest voltage imposed on protected circuitry during a 400 W transient event. The clamping voltage directly determines the safe operating margin for downstream components like MOSFETs or regulators in the SMAJ48A-E3/61-protected circuit.
Is the SMAJ48A-E3/61 suitable for automotive applications requiring AEC-Q101 qualification?
The SMAJ48A-E3/61 itself is the commercial-grade RoHS-compliant version; however, Vishay offers the functionally identical SMAJ48AHE3_A variant (with HE3 suffix) that is fully AEC-Q101 qualified. Both share identical electrical specifications, package, and pinout - the HE3 version adds rigorous stress testing for automotive under-hood use. For production automotive designs, specify SMAJ48AHE3_A; the SMAJ48A-E3/61 remains appropriate for prototyping or non-automotive industrial applications.
How does the SMAJ48A-E3/61 differ from bidirectional TVS diodes like SMAJ48CA-E3/61?
The SMAJ48A-E3/61 is unidirectional and conducts only in reverse bias (cathode positive), making it suitable for DC power rails with fixed polarity. In contrast, SMAJ48CA-E3/61 is bidirectional - it clamps symmetrically in both directions, required for AC signals or floating lines like CAN or RS-485. Both have identical VWM, VBR, and VC magnitudes, but the SMAJ48A-E3/61 exhibits forward voltage drop (~3.5 V at 25 A) while SMAJ48CA-E3/61 does not conduct forward. Select SMAJ48A-E3/61 when polarity is known and stable.
What is the thermal resistance and maximum operating temperature of the SMAJ48A-E3/61?
The SMAJ48A-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead resistance (RθJL) of 30 °C/W, measured on standard 0.2" × 0.2" copper pads. Its maximum operating junction temperature is +150 °C, with storage temperature ranging from -55 °C to +150 °C. Derating of peak pulse power begins above 25 °C ambient, per Figure 2 in the Vishay datasheet - this thermal profile makes the SMAJ48A-E3/61 suitable for under-hood automotive and high-temperature industrial deployments.
Can the SMAJ48A-E3/61 be used in place of older P6KE48A or 1.5KE48A through-hole TVS diodes?
The SMAJ48A-E3/61 provides equivalent electrical protection (same VWM, VBR, VC, and PPPM) as P6KE48A and 1.5KE48A but in a surface-mount SMA package instead of DO-15 or DO-201AD. It offers superior board-space efficiency, automated assembly compatibility, and lower profile. However, direct replacement requires verifying PCB layout (pad dimensions, thermal relief), grounding strategy, and surge energy distribution - the SMAJ48A-E3/61's lower thermal mass demands careful attention to copper pour design to replicate the heat-sinking capability of larger through-hole packages.
SMAJ48A-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:
- 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-E3/61 FAQ
1.How can I place an order for SMAJ48A-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48A-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 SMAJ48A-E3/61 reliable?
The price and inventory of SMAJ48A-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 SMAJ48A-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ48A-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48A-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48A-E3/61?
SMAJ48A-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48A-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 SMAJ48A-E3/61?
For technical support, including SMAJ48A-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48A-E3/61 requirements.
6.How does Aetrix verify that SMAJ48A-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ48A-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 SMAJ48A-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ48A-E3/61?
All SMAJ48A-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48A-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 SMAJ48A-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ48A-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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