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Vishay General Semiconductor - Diodes Division SMAJ48CAHE3_A/I
- Part No.:
- SMAJ48CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48CAHE3_A/I.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,934
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Product details
Overview
SMAJ48CAHE3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal or power lines. It features 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 - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ48CAHE3_A/I datasheet, SMAJ48CAHE3_A/I pinout, SMAJ48CAHE3_A/I application, or SMAJ48CAHE3_A/I equivalent, key selection criteria include bidirectional surge clamping capability, AEC-Q101 qualification, RoHS-compliant matte tin terminations, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 μA leakage at 48 V), but triggers into low-impedance conduction when transient voltage exceeds VBR, diverting surge current away from downstream circuitry. Its glass-passivated junction ensures stable breakdown and fast response (<1 ns).
The SMAJ48CAHE3_A/I is rated for repetitive 10/1000 μs surges at 0.01% duty cycle (400 W up to 78 V; derated to 300 W above), with thermal resistance RθJA = 120 °C/W and RθJL = 30 °C/W - enabling operation from –55 °C to +150 °C junction temperature in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected line. |
| VBR min/max | 53.3 V / 58.9 V at 1 mA - guaranteed breakdown threshold; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 77.4 V at 5.2 A - clamping voltage under full-rated surge; limits stress on downstream components. |
| PPPM | 400 W (10/1000 μs) - peak transient energy handling capacity; supports robust protection against inductive switching spikes. |
| ID @ VWM | 1.0 μA - ultra-low reverse leakage at stand-off voltage; minimizes standby power loss and signal distortion. |
| TJ max. | +150 °C - maximum junction temperature; enables use in under-hood automotive and high-temperature industrial environments. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD22 standards. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD22-B102; meets UL 94 V-0 flammability rating and MSL level 1 (peak reflow 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; common node for bidirectional conduction path | Connected to protected line; forms symmetrical clamping path with cathode during either polarity surge. |
| Cathode | Current exit terminal in forward bias; common node for bidirectional conduction path | Connected to protected line; enables identical clamping behavior for positive and negative transients. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity constraints. |
| AEC-Q101 qualification | Validated for automotive electronics including engine control units, body modules, and ADAS sensor interfaces. |
| Glass passivated junction | Ensures stable VBR over lifetime and improved resistance to humidity-induced parameter drift. |
| 400 W peak pulse power | Handles typical ISO 7637-2 Pulse 1/2a/5a transients in 12 V automotive systems without degradation. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow profile compatibility without baking preconditioning. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting LIN bus or 12 V supply rail in vehicle body control modules from load dump and inductive kickback. IC Role / Device Role / Timing Role: Shunt TVS diode placed between power rail and ground, triggered within nanoseconds to clamp transients above 48 V. Use Value: Prevents latch-up or permanent damage to microcontrollers and CAN/LIN transceivers during battery disconnection events. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp across signal and return paths, suppressing EFT bursts and electrostatic discharge. Use Value: Maintains signal integrity and avoids false readings caused by >1 kV contact ESD per IEC 61000-4-2 Level 4. |
| Consumer USB Port Surge Suppression | Telecom Ethernet PHY Protection |
Use Scenario: Adding secondary surge protection on VBUS line of USB-C ports in smart home hubs and docking stations. IC Role / Device Role / Timing Role: Secondary clamping device downstream of primary fuse or polymer PTC, activated after upstream current limiting. Use Value: Limits VBUS overshoot to <77.4 V during hot-plug transients, preventing damage to USB PD controllers and port switches. |
Use Scenario: Protecting RJ45 magnetics interface of PoE-powered network switches against lightning-induced surges on data pairs. IC Role / Device Role / Timing Role: Bidirectional TVS array element across differential pair, referenced to chassis ground via low-inductance path. Use Value: Clamps common-mode surges up to 400 W without degrading 100BASE-TX signal integrity or violating IEEE 802.3af timing margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48CA-M3 | Halogen-free, RoHS-compliant, commercial-grade variant; same electrical specs and AEC-Q101 qualification not claimed. | Lacks automotive qualification documentation; suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select SMAJ48CA-M3 when halogen-free compliance is required and automotive qualification is unnecessary. |
| SMBJ48CAHE3_A/I | Same VWM/VBR/VC ratings but in SMB (DO-214AA) package - 25% larger footprint, higher thermal mass, RθJA = 85 °C/W. | Better thermal performance under sustained surge conditions; requires larger PCB area and different pad layout. | Select SMBJ48CAHE3_A/I when higher thermal dissipation or legacy SMB footprint compatibility is prioritized over space-constrained layouts. |
Compared with SMAJ48CAHE3_A/I, SMAJ48CA-M3 omits AEC-Q101 validation and halogen-free status, while SMBJ48CAHE3_A/I trades miniaturization for improved thermal derating - making the original SMAJ48CAHE3_A/I optimal for space-limited automotive modules requiring certified reliability.
Availability
SMAJ48CAHE3_A/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, and telecom power interface designs requiring stable component supply, AEC-Q101 traceability, and consistent surge immunity performance.
Supply support for SMAJ48CAHE3_A/I 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 is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and communications systems where robustness against ESD, EFT, and surge events is critical.
FAQ
What does the "CA" suffix indicate in SMAJ48CAHE3_A/I?
The "CA" suffix denotes a bidirectional configuration: SMAJ48CAHE3_A/I conducts and clamps symmetrically for both positive and negative voltage transients, unlike unidirectional "A" variants that only protect against reverse-polarity surges. This makes SMAJ48CAHE3_A/I ideal for AC-coupled lines, differential buses, or floating grounds where polarity is undefined.
Is SMAJ48CAHE3_A/I suitable for protecting a 48 V DC power rail?
No - SMAJ48CAHE3_A/I is not recommended for direct 48 V DC rail protection because its 48 V stand-off voltage (VWM) leaves no safety margin; transients near nominal voltage may cause premature conduction. For 48 V systems, select a part with VWM ≥ 58 V (e.g., SMAJ58CAHE3_A/I) to ensure reliable blocking during normal operation while retaining clamping at ~93.6 V.
How does the HE3 suffix affect the specifications of SMAJ48CAHE3_A/I?
The "HE3" suffix indicates RoHS-compliant construction with AEC-Q101 qualification - confirming that SMAJ48CAHE3_A/I meets automotive reliability standards including temperature cycling, high-temperature reverse bias, and ESD testing. It does not alter electrical parameters but adds traceability, material compliance, and qualification documentation required for Tier 1 automotive supply chains.
What is the maximum PCB copper pad size recommended for SMAJ48CAHE3_A/I thermal performance?
Vishay specifies 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for rated 400 W peak pulse power. Using smaller pads reduces thermal dissipation capability and may cause derating - for example, SMAJ48CAHE3_A/I delivers only ~300 W at 78 V and above unless mounted on the specified pad area. Thermal performance must be validated per actual board stack-up and airflow.
Can SMAJ48CAHE3_A/I replace SMAJ43CAHE3_A/I in an existing design?
Yes, with functional verification - SMAJ48CAHE3_A/I has higher VWM (48 V vs. 43 V) and VBR (53.3–58.9 V vs. 47.8–52.8 V), resulting in later clamping onset and higher VC (77.4 V vs. 69.4 V). This increases margin against nuisance tripping but raises peak stress on downstream components; confirm protected ICs tolerate the higher clamping voltage before substitution.
SMAJ48CAHE3_A/I 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ48CAHE3_A/I FAQ
1.How can I place an order for SMAJ48CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48CAHE3_A/I 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 SMAJ48CAHE3_A/I reliable?
The price and inventory of SMAJ48CAHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ48CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ48CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48CAHE3_A/I?
SMAJ48CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48CAHE3_A/I 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 SMAJ48CAHE3_A/I?
For technical support, including SMAJ48CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48CAHE3_A/I requirements.
6.How does Aetrix verify that SMAJ48CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ48CAHE3_A/I 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 SMAJ48CAHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ48CAHE3_A/I?
All SMAJ48CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48CAHE3_A/I, 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 SMAJ48CAHE3_A/I part is unused and in its original packaging.
Return procedure for SMAJ48CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ48CAHE3_A/I Tags
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