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Vishay General Semiconductor - Diodes Division SMAJ48AHE3/5A
- Part No.:
- SMAJ48AHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48AHE3/5A.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,490
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Product details
Overview
SMAJ48AHE3/5A from Vishay General Semiconductor is a unidirectional surface-mount 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 standoff voltage (VWM), 53.3–58.9 V breakdown range at 1 mA, 77.4 V maximum clamping voltage 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 power supplies.
For engineers reviewing the SMAJ48AHE3/5A datasheet, SMAJ48AHE3/5A pinout, SMAJ48AHE3/5A application, or SMAJ48AHE3/5A equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT assembly on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamping protection device that enters avalanche conduction when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable leakage performance and fast response time (<1 ps), while the SMA package supports high thermal dissipation via low RθJL (30 °C/W) and meets MSL Level 1 reflow requirements up to 260 °C.
The device is rated for non-repetitive 8.3 ms half-sine surge current up to 40 A (IFSM) and exhibits a +0.103 %/°C temperature coefficient of VBR, enabling predictable clamping behavior across -55 to +150 °C operating range. It complies with ANSI/IEEE C62.35 and UL 497B (QVGQ2 recognition).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working margin for 48 V nominal systems. |
| VBR min/max | 53.3 V / 58.9 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on during overvoltage events without premature conduction. |
| VC @ IPPM | 77.4 V at 5.2 A - Clamped voltage under 10/1000 μs surge; limits stress on downstream 60 V-rated components. |
| PPPM | 400 W - Peak pulse power handling capability with standard 10/1000 μs waveform; sufficient for IEC 61000-4-5 Level 3 surges. |
| IFSM | 40 A - Surge current rating for 8.3 ms half-sine wave; supports robust protection against inductive switching transients. |
| TJ max | +150 °C - Maximum junction temperature enabling operation in under-hood automotive and industrial environments. |
| RθJA | 120 °C/W - Thermal resistance from junction to ambient on standard PCB layout; informs derating above 25 °C ambient. |
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 band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse surge return path | Connected to protected line ground or low-side reference; completes clamping loop during transient events. |
| Cathode | Avalanche conduction terminal / High-side connection point | Connected to the line being protected (e.g., 48 V rail); conducts reverse surge current into ground when VWM exceeded. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics requiring reliability under thermal cycling and vibration. |
| Glass passivated junction | Ensures stable reverse leakage (<1 μA at VWM) and long-term parameter stability across temperature and humidity stress. |
| 400 W peak pulse power | Supports IEC 61000-4-5 surge immunity testing at Level 3 (1 kV line-to-ground, 2 kV line-to-line) without degradation. |
| MSL Level 1 moisture sensitivity | Enables direct placement without baking; compatible with standard lead-free reflow profiles up to 260 °C peak. |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes voltage overshoot during clamping, reducing risk of latch-up or damage to 60 V tolerant ICs and gate drivers. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 48 V battery-fed ECUs and ADAS modules from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 48 V supply rail and chassis ground to clamp positive-going surges. Use Value: Limits transient voltage to ≤77.4 V, preventing damage to 60 V-rated DC-DC controllers and CAN transceivers. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) in factory automation PLCs from ESD and cable discharge. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to shunt fast transients before reaching op-amp input stages. Use Value: Sub-nanosecond response clamps ±15 kV ESD (IEC 61000-4-2) to safe levels, preserving signal integrity and ADC accuracy. |
| Telecom DC Power Input Protection | Consumer Device USB-C Power Path |
|
Use Scenario: Safeguarding PoE-powered equipment (e.g., IP cameras) against induced lightning surges on 48 V DC input lines. IC Role / Device Role / Timing Role: Primary clamping device on secondary-side 48 V bus, coordinated with upstream MOVs and fuses. Use Value: Handles repetitive 400 W surges without parametric shift, maintaining protection integrity over 10+ years field life. |
Use Scenario: Protecting USB-C PD controller and buck converter inputs in portable chargers exposed to hot-plug transients. IC Role / Device Role / Timing Role: Unidirectional TVS on VBUS line to suppress overshoot during source-sink handshaking and cable insertion. Use Value: Low capacitance (<100 pF) avoids signal distortion on 3 A/20 V PD negotiation lines while clamping to <80 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48A-E3/5A | Commercial-grade version without AEC-Q101 qualification; identical electrical specs and SMA package. | Approved for industrial/commercial use only; not certified for automotive production. | Select when AEC-Q101 is not required and cost optimization is prioritized. |
| SMAJ48CAHE3/5A | Bidirectional variant with same VWM (48 V), symmetric clamping in both polarities, VBR = 53.3–58.9 V in either direction. | Suitable for AC-coupled or floating signal lines where negative transients must also be suppressed. | Choose for differential data lines, RS-485, or transformer-isolated rails needing bidirectional protection. |
Compared with SMAJ48AHE3/5A, the SMAJ48A-E3/5A offers identical protection performance at lower qualification cost, while SMAJ48CAHE3/5A extends clamping coverage to negative excursions - making the unidirectional AEC-Q101 version optimal for 48 V automotive power rail hardening where polarity is fixed and reliability is mandated.
Availability
SMAJ48AHE3/5A is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom DC power input protection requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ48AHE3/5A 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, rectifiers, MOSFETs, and protection devices with emphasis on reliability and application-specific validation.
The SMAJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where AEC-Q101 compliance and repeatable clamping performance are critical.
FAQ
What is the clamping voltage of SMAJ48AHE3/5A at its rated peak pulse current?
The SMAJ48AHE3/5A has a maximum clamping voltage (VC) of 77.4 V at 5.2 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and ensures downstream 60 V-rated components remain within safe operating limits during surge events. The SMAJ48AHE3/5A maintains this clamping performance across its full operating temperature range.
Is SMAJ48AHE3/5A suitable for automotive applications?
Yes, SMAJ48AHE3/5A is AEC-Q101 qualified and specifically intended for automotive use, including engine control units, body electronics, and ADAS modules. Its construction - glass-passivated junction, MSL Level 1 rating, and operation from -55 to +150 °C - meets stringent automotive reliability requirements. The "HE3" suffix explicitly denotes AEC-Q101 qualification, distinguishing it from commercial-grade variants like SMAJ48A-E3/5A.
What is the standoff voltage (VWM) and why is it important for SMAJ48AHE3/5A?
The standoff voltage (VWM) of SMAJ48AHE3/5A is 48 V - the maximum continuous reverse voltage the device can withstand without entering avalanche conduction. This parameter ensures the SMAJ48AHE3/5A remains non-conductive during normal 48 V system operation, minimizing leakage current (<1 μA) and avoiding unnecessary power loss or false triggering. It directly determines compatibility with nominal 48 V power architectures.
How does the thermal resistance of SMAJ48AHE3/5A affect its power handling?
SMAJ48AHE3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W on standard PCB layout (0.2" × 0.2" copper pads). This means each watt of steady-state power raises junction temperature by 120 °C above ambient - limiting continuous dissipation to ~3.3 W. However, its 400 W peak pulse rating applies only to short-duration transients (≤1000 μs), where thermal mass prevents immediate overheating. Derating curves in the datasheet guide safe repetitive surge usage.
What packaging and reel options are available for SMAJ48AHE3/5A?
SMAJ48AHE3/5A is supplied in 13" diameter plastic tape and reel format with a base quantity of 7500 pieces per reel (package code "5A"). It uses industry-standard 8 mm tape width and EIA-481-compliant embossed carrier tape. The device is RoHS-compliant, halogen-free, and qualified to JESD 201 Class 2 for whisker resistance - ensuring compatibility with high-volume SMT assembly lines and long-term storage stability.
SMAJ48AHE3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ48AHE3/5A FAQ
1.How can I place an order for SMAJ48AHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48AHE3/5A 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 SMAJ48AHE3/5A reliable?
The price and inventory of SMAJ48AHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ48AHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ48AHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48AHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48AHE3/5A?
SMAJ48AHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48AHE3/5A 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 SMAJ48AHE3/5A?
For technical support, including SMAJ48AHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48AHE3/5A requirements.
6.How does Aetrix verify that SMAJ48AHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ48AHE3/5A 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 SMAJ48AHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ48AHE3/5A?
All SMAJ48AHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48AHE3/5A, 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 SMAJ48AHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ48AHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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