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Vishay General Semiconductor - Diodes Division SMAJ48CAHE3_A/H
- Part No.:
- SMAJ48CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48CAHE3_A/H.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:13,328
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Product details
Overview
SMAJ48CAHE3_A/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal and power lines. 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 (10/1000 μs waveform). It is AEC-Q101 qualified and used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial power supplies.
For engineers reviewing the SMAJ48CAHE3_A/H datasheet, SMAJ48CAHE3_A/H pinout, SMAJ48CAHE3_A/H application, or SMAJ48CAHE3_A/H equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM = 1.61), AEC-Q101 qualification, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
The SMAJ48CAHE3_A/H operates as a silicon avalanche diode that enters conduction when reverse voltage exceeds its breakdown threshold, diverting surge current away from protected circuitry. Its bidirectional symmetry enables protection of AC-coupled or differential signal paths without polarity concerns.
It delivers 400 W peak pulse power under standardized 10/1000 μs waveform conditions, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), enabling reliable operation up to +150 °C junction temperature. The device exhibits <1 ns response time and low incremental surge resistance for effective transient suppression.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 48 V nominal systems. |
| VBR (min/max) | 53.3 V / 58.9 V at 1 mA - Confirmed breakdown range ensures consistent turn-on across production lots and temperature. |
| VC @ IPPM | 77.4 V at 5.2 A - Clamping voltage limits downstream component stress during 400 W transient events. |
| PPPM | 400 W (10/1000 μs) - Peak surge energy handling capacity suitable for automotive load-dump and inductive switching events. |
| IFSM | 40 A (8.3 ms half-sine) - Withstands single high-current surges common in motor drive and relay coil snubbing. |
| TJ max | +150 °C - Enables use in under-hood automotive environments and high-temperature industrial enclosures. |
| MSL Level | Level 1 (J-STD-020) - Supports standard reflow profiles without baking; compatible with high-volume SMT assembly. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with matte tin-plated leads. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H); cathode band not marked (bidirectional type).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (one polarity) | Provides symmetrical conduction path in both directions; no polarity marking required for bidirectional operation. |
| Cathode | Transient current exit point (opposite polarity) | Functions identically to Anode due to bidirectional structure; terminals are interchangeable in layout. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics per stress test requirements. |
| 400 W peak pulse power | Handles ISO 7637-2 Pulse 1, 2a, 3a/b and ISO 16750-2 load-dump surges without degradation. |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes overvoltage exposure to protected ICs while maintaining margin above system rail. |
| MSL Level 1 rating | Eliminates pre-bake requirement and supports standard lead-free reflow (260 °C peak), reducing manufacturing cost. |
| Glass passivated junction | Ensures stable leakage performance (<1.0 μA at VWM) and long-term reliability under thermal cycling. |
Applications
| Automotive Power Supply Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 48 V battery-supplied ECUs from load-dump transients up to 60 V and inductive switching spikes. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed at input filter stage to shunt surge energy before DC/DC converter. Use Value: Limits voltage excursion to ≤77.4 V during 400 W transients, preventing damage to downstream 60 V-rated regulators and microcontrollers. |
Use Scenario: Shielding analog output lines of pressure/temperature sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly at connector interface to suppress ESD and cable discharge events. Use Value: Sub-1 ns response and <1.0 μA leakage at 48 V ensure signal integrity preservation and zero impact on 4–20 mA loop accuracy. |
| Telecom DC Power Feeding Protection | Consumer Appliance Motor Drive Snubbing |
|
Use Scenario: Safeguarding PoE-powered equipment inputs against induced surges from nearby AC mains or lightning coupling. IC Role / Device Role / Timing Role: Bidirectional clamping device installed across DC input rails upstream of primary DC/DC stage. Use Value: 400 W rating and 150 °C max junction temperature support sustained operation in enclosed telecom cabinets with limited airflow. |
Use Scenario: Suppressing back-EMF spikes generated by brushed DC motors in smart home appliances (e.g., vacuum cleaners, washing machines). IC Role / Device Role / Timing Role: Mounted across motor terminals to clamp inductive kickback during PWM commutation. Use Value: 40 A non-repetitive surge rating handles repeated motor stall currents; RoHS-compliant and halogen-free (HE3 suffix) meets global eco-regulations. |
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-M3 | Same electrical specs and AEC-Q101 qualification; halogen-free construction instead of standard RoHS. | Preferred where halogen-free compliance is mandated (e.g., EU WEEE, Japanese JIS C 0950). | Select SMAJ48CA-M3 if halogen-free materials are required; otherwise SMAJ48CAHE3_A/H offers identical protection with broader supply chain availability. |
| SMBJ48CAHE3_A/H | Same VWM, VBR, VC; higher 600 W PPPM rating and SMB (DO-214AA) package (larger footprint, lower RθJA). | Better suited for higher-energy transients or thermally constrained layouts requiring lower junction temperature rise. | Choose SMBJ48CAHE3_A/H only when >400 W surge margin is needed or thermal design cannot meet SMA's 120 °C/W RθJA. |
Compared with SMAJ48CA-M3, the SMAJ48CAHE3_A/H provides identical surge protection performance with standard RoHS compliance; compared with SMBJ48CAHE3_A/H, it trades 200 W peak power headroom for 30% smaller PCB area and compatibility with tighter pitch layouts.
Availability
SMAJ48CAHE3_A/H is available at Aetrix Electronics and suitable for automotive ECU designs, industrial sensor interfaces, telecom power feeding circuits, and consumer appliance motor drives requiring stable component supply and AEC-Q101 assurance.
Supply support for SMAJ48CAHE3_A/H 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 automotive-grade validation.
The SMAJ series is engineered for robust transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where high surge immunity and long-term stability are critical.
FAQ
What is the clamping voltage of the SMAJ48CAHE3_A/H at its rated peak pulse current?
The SMAJ48CAHE3_A/H has a maximum clamping voltage (VC) of 77.4 V at 5.2 A peak pulse current (IPPM), measured under the standard 10/1000 μs waveform. This value is confirmed in the Vishay datasheet Document Number 88390, page 2, and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ48CAHE3_A/H maintains this clamping performance across its full operating temperature range.
Is the SMAJ48CAHE3_A/H suitable for automotive applications?
Yes, the SMAJ48CAHE3_A/H is AEC-Q101 qualified, as explicitly stated in the Vishay datasheet (page 2, Notes section). This certification validates its reliability under automotive stress conditions including temperature cycling, humidity bias, and mechanical shock. The SMAJ48CAHE3_A/H is commonly deployed in engine control units, body control modules, and ADAS power supplies where transient immunity and long-term stability are mandatory.
What does the "HE3" suffix indicate in SMAJ48CAHE3_A/H?
The "HE3" suffix denotes RoHS-compliant construction with AEC-Q101 qualification, per Vishay's ordering nomenclature (page 3, Ordering Information). "H" identifies the tape-and-reel packaging option (7″ diameter, 1800 units/reel), while "E3" specifies the RoHS-compliant finish. The "_A/H" revision code indicates the specific manufacturing lot and process revision per Vishay's internal tracking. The SMAJ48CAHE3_A/H thus combines environmental compliance, automotive qualification, and standardized SMT packaging.
How does the bidirectional configuration of SMAJ48CAHE3_A/H affect its circuit implementation?
The SMAJ48CAHE3_A/H is bidirectional, meaning it functions identically in both polarities-no cathode marking is present, and either terminal may serve as anode or cathode depending on transient polarity. This eliminates orientation constraints during PCB layout and enables protection of AC-coupled signals, differential buses (e.g., CAN, RS-485), or ungrounded power rails. Unlike unidirectional variants, the SMAJ48CAHE3_A/H requires no polarity-aware placement, simplifying assembly and reducing risk of misorientation.
What is the thermal resistance of the SMAJ48CAHE3_A/H, and how does it impact PCB layout?
The SMAJ48CAHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead resistance (RθJL) of 30 °C/W, per the Vishay datasheet (page 3, Thermal Characteristics). To maintain safe junction temperatures, the device must be mounted on minimum recommended 0.2″ × 0.2″ (5.0 mm × 5.0 mm) copper pads per terminal. Reducing pad size or omitting thermal vias increases RθJA, risking thermal runaway during repetitive surges. The SMAJ48CAHE3_A/H's thermal profile directly dictates copper area and via count in production layouts.
SMAJ48CAHE3_A/H 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/H FAQ
1.How can I place an order for SMAJ48CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48CAHE3_A/H 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/H reliable?
The price and inventory of SMAJ48CAHE3_A/H 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/H is usually 5 days.
3.What payment methods are accepted for SMAJ48CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48CAHE3_A/H?
SMAJ48CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48CAHE3_A/H 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/H?
For technical support, including SMAJ48CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48CAHE3_A/H requirements.
6.How does Aetrix verify that SMAJ48CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ48CAHE3_A/H 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/H meets industry standards.
7.What is the process for return or replacement of SMAJ48CAHE3_A/H?
All SMAJ48CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48CAHE3_A/H, 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/H part is unused and in its original packaging.
Return procedure for SMAJ48CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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