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Vishay General Semiconductor - Diodes Division SMAJ48C-E3/5A
- Part No.:
- SMAJ48C-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48C-E3/5A.pdf
- Description:
- TVS DIODE 48VWM 85.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,065
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Product details
Overview
SMAJ48C-E3/5A from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping voltage transients on signal or power lines. It features 48 V stand-off voltage (VWM), 85.5 V maximum clamping voltage (VC) at 4.7 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - suitable for protecting sensor interfaces and automotive control modules against ESD and load dump.
For engineers reviewing the SMAJ48C-E3/5A datasheet, SMAJ48C-E3/5A pinout, SMAJ48C-E3/5A application, or SMAJ48C-E3/5A equivalent, key selection criteria include bi-directional surge capability, low leakage (<1 µA at 48 V), RoHS-compliant matte tin terminals, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 5.0 × 5.0 mm copper pads.
Technical Context
This bi-directional TVS operates symmetrically in both polarities, with breakdown voltage (VBR) specified between 53.3 V and 65.1 V at 1 mA test current. Its clamping behavior is characterized by low dynamic impedance, enabling effective suppression of fast transients such as IEC 61000-4-2 ESD (±15 kV air/±8 kV contact) and ISO 7637-2 load dump pulses.
The device uses a glass-passivated silicon junction, rated for operating junction temperatures from –55 °C to +150 °C, and exhibits typical thermal resistance of 120 °C/W (junction-to-ambient) when mounted per recommended pad layout. It meets JESD201 Class 1A whisker resistance and is qualified to RoHS 2002/95/EC and WEEE 2002/96/EC directives.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse working voltage before conduction begins; defines safe operating margin for protected line. |
| VC @ IPPM | 85.5 V at 4.7 A - Clamped voltage during 10/1000 µs surge; limits stress on downstream ICs like microcontrollers or CAN transceivers. |
| PPPM | 400 W - Peak pulse power handling with 10/1000 µs waveform; supports robust protection in industrial and automotive environments. |
| IPPM | 4.7 A - Peak pulse current corresponding to VC; determines minimum trace width and PCB layout robustness required. |
| ID @ VWM | <1 µA - Reverse leakage at stand-off voltage; ensures negligible standby power loss in battery-powered systems. |
| TJ Range | –55 °C to +150 °C - Full operational junction temperature range; validated for under-hood automotive use. |
| Package | DO-214AC (SMA) - Surface-mount package with 5.0 × 5.0 mm thermal pad footprint; compatible with standard reflow profiles up to 260 °C. |
Pinout & Package
DO-214AC (SMA) package: bi-directional device with no polarity marking; symmetrical two-terminal construction. Cathode band absent - terminals are interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (bidirectional) | Surge current path | Both terminals conduct identically during positive or negative transients; no DC bias dependency. |
| Case / Body | Thermal interface | Exposed metal slug provides primary heat dissipation path to PCB copper; requires minimum 5.0 × 5.0 mm pad area per terminal. |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, USB D+/D–) without polarity concerns. |
| Glass-passivated junction | Ensures stable VBR and low leakage over lifetime; resists humidity-induced parameter drift in harsh environments. |
| MSL Level 1 rating | Allows unlimited floor life before reflow; eliminates bake-out requirement and simplifies SMT line logistics. |
| 400 W pulse power (≤78 V) | Meets ISO 7637-2 Pulse 1/2a/5a immunity requirements for 12 V automotive systems without derating. |
| RoHS-compliant matte tin leads | Guarantees solderability per J-STD-002 and JESD22-B102; supports lead-free reflow with zero whisker risk (JESD201 Class 1A). |
Applications
| Automotive Sensor Interface | Industrial RS-485 Bus |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine control units exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bi-directional voltage clamp placed directly at connector entry point to limit transient energy entering MCU ADC inputs. Use Value: Maintains signal integrity below 85.5 V during 100 V/50 ms load dump events, preventing ADC saturation or latch-up. |
Use Scenario: Safeguarding differential data lines in factory automation PLCs subject to inductive switching noise from solenoid valves. IC Role / Device Role / Timing Role: Low-capacitance TVS across A/B lines to absorb common-mode surges while preserving signal rise time. Use Value: Junction capacitance <100 pF at 0 V enables >10 Mbps RS-485 operation without signal distortion. |
| Consumer USB Port Protection | Telecom Power Rail Clamp |
Use Scenario: ESD protection for USB 2.0 upstream ports in set-top boxes subjected to ±8 kV contact discharge per IEC 61000-4-2. IC Role / Device Role / Timing Role: Bi-directional shunt device on VBUS and data lines to divert ESD current away from USB PHY. Use Value: Sub-1 ns response time clamps transients before USB PHY internal protection triggers, reducing failure rate. |
Use Scenario: Secondary overvoltage clamp on 48 V telecom power distribution boards during hot-swap or short-circuit recovery. IC Role / Device Role / Timing Role: Fast-acting crowbar element parallel to primary DC-DC converter output capacitor. Use Value: 4.7 A IPPM rating handles 100 µs surges from relay bounce without degradation, extending system uptime. |
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-E3/5A | Identical electrical specs and packaging; CA suffix denotes same bi-directional configuration per Vishay ordering nomenclature. | No functional difference; CA and C suffixes are interchangeable per Vishay Doc. 88390 Rev. 29-Oct-08. | Select SMAJ48CA-E3/5A only if legacy BOM specifies CA; otherwise SMAJ48C-E3/5A is preferred for newer designs. |
| SMCJ48C-E3/57T | Higher 1500 W PPPM, larger DO-214AB (SMC) package, 93.6 V VC at 12.3 A - physically incompatible pinout and thermal profile. | Used where higher surge energy (e.g., ISO 7637-2 Pulse 5b) must be absorbed; requires PCB redesign and increased board area. | Choose SMCJ48C-E3/57T only when 400 W is insufficient; SMAJ48C-E3/5A remains optimal for space-constrained 12 V/24 V control modules. |
Compared with SMAJ48CA-E3/5A (functionally identical) and SMCJ48C-E3/57T (higher-power but non-pin-compatible), SMAJ48C-E3/5A delivers optimal balance of surge rating, compact DO-214AC footprint, and automotive-grade reliability - making it the default choice for cost-sensitive, space-limited protection of 48 V-tolerant interfaces.
Availability
SMAJ48C-E3/5A is available at Aetrix Electronics and suitable for automotive sensor protection, industrial communication bus hardening, and consumer port-level ESD mitigation requiring stable component supply across multi-year production cycles.
Supply support for SMAJ48C-E3/5A 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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SMAJ series targets surface-mount transient suppression in space-constrained, high-volume applications - engineered specifically for robustness against repetitive surges in automotive ECUs and industrial controllers.
FAQ
What is the clamping voltage of SMAJ48C-E3/5A under a 10/1000 µs surge?
The SMAJ48C-E3/5A clamps to a maximum of 85.5 V when subjected to its rated peak pulse current of 4.7 A using the standardized 10/1000 µs waveform. This value is measured per Figure 1 and Table on page 3 of Vishay Document 88390, and defines the upper voltage limit imposed on protected circuitry during transient events.
Is SMAJ48C-E3/5A suitable for automotive applications?
Yes, SMAJ48C-E3/5A is qualified for automotive use per its compliance with AEC-Q101 when ordered with HE3 suffix; however, the E3/5A variant meets RoHS, MSL Level 1, and 150 °C TJ rating - making it suitable for under-dash and cabin modules. For engine bay deployment, verify thermal margin using RθJA = 120 °C/W and ambient derating curves in Figure 2.
How does SMAJ48C-E3/5A differ from SMAJ48A-E3/5A?
SMAJ48C-E3/5A is bi-directional with symmetrical clamping in both polarities, while SMAJ48A-E3/5A is uni-directional and includes a cathode band marking. Their VWM (48 V), VC (77.4 V), and IPPM (5.2 A) differ due to distinct junction design - selecting SMAJ48C-E3/5A avoids polarity-matching errors in AC or floating signal paths.
What is the maximum reverse leakage current for SMAJ48C-E3/5A at 25 °C?
At 25 °C and rated stand-off voltage (VWM = 48 V), the SMAJ48C-E3/5A exhibits a maximum reverse leakage current (ID) of 1.0 µA, as specified in the Electrical Characteristics table on page 3 of Vishay Document 88390. This low leakage ensures minimal power drain in always-on battery systems.
Does SMAJ48C-E3/5A require special PCB layout considerations?
Yes - Vishay specifies mounting on minimum 0.2 × 0.2 inch (5.0 × 5.0 mm) copper pads per terminal to achieve rated 400 W pulse power. Inadequate copper area causes thermal runaway during surge events; the DO-214AC package relies on pad conduction for heat dissipation, not just component body convection.
SMAJ48C-E3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 85.5V
- Current - Peak Pulse (10/1000µs):
- 4.7A
- 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)
SMAJ48C-E3/5A FAQ
1.How can I place an order for SMAJ48C-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48C-E3/5A 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 SMAJ48C-E3/5A reliable?
The price and inventory of SMAJ48C-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ48C-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ48C-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48C-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48C-E3/5A?
SMAJ48C-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48C-E3/5A 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 SMAJ48C-E3/5A?
For technical support, including SMAJ48C-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48C-E3/5A requirements.
6.How does Aetrix verify that SMAJ48C-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ48C-E3/5A 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 SMAJ48C-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ48C-E3/5A?
All SMAJ48C-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48C-E3/5A, 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 SMAJ48C-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ48C-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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