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Vishay General Semiconductor - Diodes Division SMAJ48A-E3/5A
- Part No.:
- SMAJ48A-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48A-E3/5A.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,548
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Product details
Overview
SMAJ48A-E3/5A from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. 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 on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ48A-E3/5A datasheet, SMAJ48A-E3/5A pinout, SMAJ48A-E3/5A application, or SMAJ48A-E3/5A equivalent, key selection criteria include clamping performance under 5.2 A surge, thermal resistance (RθJA = 120 °C/W), RoHS-compliant matte tin plating, and AEC-Q101 qualification eligibility via HE3 suffix variants.
Technical Context
This TVS diode operates as a fast-acting shunt clamp during transient events, leveraging an avalanche breakdown mechanism to limit voltage across protected circuitry. Its unidirectional polarity (cathode-banded) enables integration into DC-biased lines without reverse conduction concerns, and its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and repeatable clamping behavior.
The device is rated for non-repetitive 8.3 ms half-sine surge current up to 40 A (IFSM) and supports operation from –55 °C to +150 °C junction temperature. Mounting on 5.0 mm × 5.0 mm copper pads per terminal is required to sustain full 400 W pulse power capability below 78 V - derated to 300 W above that threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC bias margin. |
| VBR (min/max) | 53.3 V / 58.9 V at 1 mA - Ensures reliable turn-on within defined tolerance band during transients. |
| VC @ IPPM | 77.4 V at 5.2 A - Clamped voltage seen by downstream ICs during 10/1000 μs surge; limits stress on 5 V–48 V systems. |
| PPPM | 400 W - Peak pulse power handling with standard 10/1000 μs waveform; validates protection against IEC 61000-4-5 surges. |
| IFSM | 40 A - Single half-sine surge current rating (8.3 ms); supports motor drive and relay coil switching events. |
| TJ max | +150 °C - Enables use in under-hood automotive and high-temperature industrial enclosures without derating. |
| RθJA | 120 °C/W - Thermal resistance from junction to ambient on standard PCB layout; informs heatsinking requirements. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by molded band on body; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts avalanche current to ground during overvoltage event. |
| Anode (unmarked end) | Reference/return path | Typically tied to system ground or low-impedance return plane; completes clamping current path. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Validates compliance with IEC 61000-4-5 Level 4 surge immunity testing for industrial and automotive applications. |
| 77.4 V clamping voltage at 5.2 A | Provides <30 V overhead margin for 48 V nominal systems, preventing latch-up or damage to downstream 5 V logic rails. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage current across temperature and lifetime, critical for automotive field reliability. |
| MSL Level 1 (260 °C peak reflow) | Supports single-pass lead-free reflow assembly without moisture-related popcorning or delamination risks. |
| AEC-Q101 qualification option (HE3/HM3) | Enables drop-in use in automotive powertrain and body control modules where component-level qualification is mandatory. |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
Use Scenario: Protection of 48 V battery-fed ECU power inputs against load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional shunt clamp placed between VIN and GND, triggered within <1 ns to limit voltage excursions. Use Value: Maintains VC ≤ 77.4 V during 100 V/100 ms load dump events, preserving MCU and CAN transceiver integrity. |
Use Scenario: Shielding analog outputs (e.g., 4–20 mA loops) of pressure/temperature sensors from ESD and inductive coupling. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF) TVS placed at connector interface to divert fast transients before reaching ADC front-end. Use Value: Limits induced voltage spikes to <80 V while adding negligible signal distortion due to minimal junction capacitance. |
| Telecom DC Power Feeds | Consumer Appliance Motor Drivers |
Use Scenario: Surge suppression on -48 V telecom rectifier outputs exposed to lightning-induced surges on outdoor plant wiring. IC Role / Device Role / Timing Role: Primary overvoltage clamp on distributed power bus, coordinated with upstream MOVs for staged protection. Use Value: Handles repetitive 400 W pulses without degradation, supporting Telcordia GR-1089-CORE Level 3 surge requirements. |
Use Scenario: Input rail protection for BLDC motor controllers in washing machines and HVAC systems subject to relay bounce and back-EMF. IC Role / Device Role / Timing Role: Fast-response TVS parallel to bulk input capacitor, clamping 60 V+ flyback spikes from inductive loads. Use Value: Withstands 40 A IFSM, enabling direct placement across H-bridge supply rails without series fusing. |
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-M3/5A | Halogen-free, RoHS-compliant variant with identical electrical specs and SMA package. | No functional difference; selected when halogen-free material compliance is mandated by OEM or regional regulations. | Direct substitution where halogen-free bill-of-materials is required; same thermal and clamping performance. |
| SMAJ48CA-E3/5A | Bidirectional version with symmetric VBR (53.3–58.9 V) and same VC/PPPM; no polarity marking. | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN FD) where reverse polarity transients occur. | Use only when bidirectional clamping is needed; not pin-compatible in unidirectional DC designs due to lack of cathode reference. |
Compared with SMAJ48A-E3/5A, the M3 variant offers identical protection performance with halogen-free construction, while the SMAJ48CA-E3/5A provides symmetrical clamping essential for differential or AC-biased interfaces - neither replaces the original in unidirectional DC applications without circuit review.
Availability
SMAJ48A-E3/5A is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, telecom power feeds, and consumer appliance motor drivers requiring stable component supply and consistent surge immunity performance.
Supply support for SMAJ48A-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 diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific optimization.
The SMAJ series delivers standardized, high-power TVS protection for harsh-environment applications - engineered for rapid response, stable clamping, and compatibility with automated SMT assembly in automotive and industrial markets.
FAQ
What is the clamping voltage of the SMAJ48A-E3/5A under a 10/1000 μs surge?
The SMAJ48A-E3/5A exhibits a maximum clamping voltage (VC) of 77.4 V at 5.2 A peak pulse current with a 10/1000 μs waveform. This value is measured per standard test conditions and defines the upper voltage limit imposed on protected circuitry during transient events. The SMAJ48A-E3/5A maintains this clamping performance consistently across its specified operating temperature range and is validated using Vishay's published test methodology in Document Number 88390.
Is the SMAJ48A-E3/5A suitable for automotive applications?
The SMAJ48A-E3/5A itself is commercial-grade, but Vishay offers AEC-Q101 qualified versions under the HE3 and HM3 suffixes (e.g., SMAJ48AHE3_A/I). While the SMAJ48A-E3/5A shares identical electrical characteristics and package, it lacks formal automotive qualification. For production automotive use, engineers must specify the HE3/HM3 variant; the SMAJ48A-E3/5A remains appropriate for prototyping, industrial, or non-safety-critical automotive subsystems.
What is the meaning of the "E3/5A" suffix in SMAJ48A-E3/5A?
The "E3" denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads, while "5A" specifies the packaging format: 7500 units per 13-inch plastic tape-and-reel. This differs from "E3/61", which uses 7-inch reels with 1800 units. Both share identical electrical and thermal specifications; the suffix solely identifies environmental compliance and logistics configuration - the SMAJ48A-E3/5A is fully interchangeable electrically with other E3-packaged variants.
How does the SMAJ48A-E3/5A compare to SMAJ48CA-E3/5A?
The SMAJ48A-E3/5A is unidirectional with cathode identification, whereas the SMAJ48CA-E3/5A is bidirectional and polarity-agnostic. Both share identical VWM (48 V), VBR, VC, and PPPM, but the CA version clamps equally in both directions - making it suitable for AC or differential lines like RS-485. The SMAJ48A-E3/5A cannot substitute for the CA variant in bidirectional applications without redesign, as its cathode orientation enforces DC-biased operation.
What PCB layout guidance applies to the SMAJ48A-E3/5A for optimal thermal performance?
To achieve rated 400 W peak pulse power, the SMAJ48A-E3/5A must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, per Vishay's recommended pad layout. Smaller pads increase thermal resistance and reduce surge capability. Trace width and internal copper layers should minimize impedance to ground; thermal vias under pads improve heat dissipation. The SMAJ48A-E3/5A's RθJA of 120 °C/W assumes this baseline layout - deviations require derating per Figure 2 in Document 88390.
SMAJ48A-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:
- 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-E3/5A FAQ
1.How can I place an order for SMAJ48A-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48A-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 SMAJ48A-E3/5A reliable?
The price and inventory of SMAJ48A-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 SMAJ48A-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ48A-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48A-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48A-E3/5A?
SMAJ48A-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48A-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 SMAJ48A-E3/5A?
For technical support, including SMAJ48A-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48A-E3/5A requirements.
6.How does Aetrix verify that SMAJ48A-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ48A-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 SMAJ48A-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ48A-E3/5A?
All SMAJ48A-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48A-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 SMAJ48A-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ48A-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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