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Vishay General Semiconductor - Diodes Division SMAJ48AHE3_A/I
- Part No.:
- SMAJ48AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48AHE3_A/I.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,275
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Product details
Overview
SMAJ48AHE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping fast-rising ESD and surge transients on power and signal 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 (IPPM), 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 SMAJ48AHE3_A/I datasheet, SMAJ48AHE3_A/I pinout, SMAJ48AHE3_A/I application, or SMAJ48AHE3_A/I 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 standard PCB copper pads.
Technical Context
This TVS diode operates as a voltage-clamping protection device triggered by reverse-biased avalanche breakdown above its VWM of 48 V. Its response time is sub-nanosecond, enabling suppression of ESD events per IEC 61000-4-2 (±30 kV contact) and lightning surges per IEC 61000-4-5 (4 kV line-to-line).
The device uses a glass-passivated silicon junction housed in an SMA (DO-214AC) package with matte tin-plated leads, rated for MSL Level 1 per J-STD-020 and qualified to AEC-Q101 for automotive under-hood applications. Thermal resistance is 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working margin for protected circuitry. |
| VBR min/max | 53.3 V / 58.9 V at 1 mA - guaranteed avalanche initiation range; ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 77.4 V at 5.2 A - clamped voltage during 10/1000 μs surge; determines maximum stress imposed on downstream components. |
| PPPM | 400 W - peak pulse power handling with 10/1000 μs waveform; supports robust protection against common industrial and automotive transients. |
| ID @ VWM | 1.0 μA - reverse leakage at rated stand-off voltage; negligible power loss and minimal impact on high-impedance sensor or bias networks. |
| TJ max | +150 °C - maximum junction temperature; enables operation in under-hood automotive environments and sealed industrial enclosures. |
| IFSM | 40 A - non-repetitive forward surge current rating (8.3 ms half-sine); supports limited fault-current tolerance in bidirectional clamp configurations or miswiring scenarios. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, single-ended unidirectional configuration with cathode band marking. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); weight: 0.064 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path); conducts during forward surge events up to 40 A (IFSM). |
| Cathode | Avalanche clamping terminal | Marked with band; connected to protected line (e.g., 48 V rail or signal input); initiates clamping when reverse voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood use including thermal cycling, humidity, and mechanical shock per stress test requirements. |
| Glass passivated junction | Enhances long-term reliability and stability of VBR and leakage under high-temperature/humidity aging conditions. |
| MSL Level 1 | Unlimited floor life at ≤30 °C/85 % RH; compatible with standard reflow profiles up to 260 °C peak without baking. |
| 400 W peak pulse power | Handles repetitive 10/1000 μs surges at 0.01 % duty cycle - sufficient for CAN bus, LIN, and 12 V/24 V power rail protection. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage overshoot during transient events, reducing risk of latch-up or gate oxide damage in protected MOSFETs and ICs. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 48 V battery management system (BMS) inputs and outputs from load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between 48 V rail and ground, activated within <1 ns upon overvoltage detection. Use Value: Limits transient voltage to ≤77.4 V, preventing damage to MCU power supplies and analog front-end ICs rated for 60 V absolute maximum. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop drivers) in PLC modules exposed to field wiring surges. IC Role / Device Role / Timing Role: Standoff-connected TVS on signal line to ground, absorbing induced spikes from relay switching or motor drive noise. Use Value: Maintains signal integrity with only 1.0 μA leakage at 48 V, avoiding offset errors in precision current sources. |
| Telecom DC Power Input Protection | Consumer Device USB/DC Jack Protection |
|
Use Scenario: Securing 48 V PoE+ (IEEE 802.3at) power input stages in network switches and IP cameras against cable-induced surges. IC Role / Device Role / Timing Role: Primary clamping device on DC input before DC-DC converter, sized for 400 W pulse handling per IEEE 61000-4-5 Level 4. Use Value: Enables compliance with IEC 61000-4-5 (4 kV line-to-line) while maintaining low thermal resistance (RθJA = 120 °C/W) on standard PCB layout. |
Use Scenario: Adding surge immunity to 48 V DC input jacks in smart home hubs and security gateways. IC Role / Device Role / Timing Role: Low-profile TVS mounted directly at connector entry point, leveraging SMA footprint for space-constrained designs. Use Value: Supports automated placement and reflow soldering without derating, meeting RoHS and halogen-free requirements via HE3 suffix. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48AHM3_A/I | Halogen-free, RoHS-compliant, AEC-Q101 qualified - identical electrical specs but different material composition. | Required where halogen-free compliance is mandated (e.g., EU public infrastructure projects). | Select SMAJ48AHM3_A/I if halogen-free materials are specified; otherwise SMAJ48AHE3_A/I meets general automotive and industrial requirements. |
| SMAJ48A-E3/5A | Commercial-grade (non-AEC-Q101), same electrical specs, packaged in 13" reel (7500 pcs) with E3 suffix (RoHS, not automotive qualified). | Suitable for cost-sensitive consumer or industrial applications without automotive qualification needs. | Choose SMAJ48A-E3/5A for non-automotive volume production where AEC-Q101 is not required and tape-and-reel logistics favor 13" reels. |
Compared with SMAJ48AHM3_A/I and SMAJ48A-E3/5A, the SMAJ48AHE3_A/I uniquely combines AEC-Q101 qualification with standard RoHS compliance - making it the preferred choice for automotive Tier-1 suppliers needing traceable, qualified TVS devices without halogen-free constraints.
Availability
SMAJ48AHE3_A/I is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom DC input surge suppression requiring stable component supply, full traceability, and AEC-Q101 validation.
Supply support for SMAJ48AHE3_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, TVS devices, and optoelectronics with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMAJ series was developed specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness, fast response, and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of SMAJ48AHE3_A/I at its rated peak pulse current?
The SMAJ48AHE3_A/I has a maximum clamping voltage (VC) of 77.4 V at its rated peak pulse current (IPPM) of 5.2 A, measured using the standardized 10/1000 μs double-exponential surge waveform. This value ensures protected circuits remain below critical overvoltage thresholds during transient events. The SMAJ48AHE3_A/I maintains this clamping performance across its full operating temperature range of –55 °C to +150 °C.
Is SMAJ48AHE3_A/I suitable for automotive applications?
Yes, SMAJ48AHE3_A/I is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix indicating RoHS-compliant and AEC-Q101 qualified construction. It meets stress test requirements for temperature cycling, humidity, mechanical shock, and high-temperature operating life - making it appropriate for engine control units, body electronics, and ADAS power domains. The SMAJ48AHE3_A/I is validated for under-hood ambient temperatures up to +125 °C.
What does the "_A/I" suffix mean in SMAJ48AHE3_A/I?
The "_A/I" suffix in SMAJ48AHE3_A/I denotes packaging and reel configuration: "A" indicates the revision code (per Vishay's internal revision tracking), and "I" specifies 13-inch diameter plastic tape-and-reel packaging containing 7500 units. This format aligns with Vishay's ordering convention for high-volume SMT assembly and is compatible with standard pick-and-place equipment. The SMAJ48AHE3_A/I is supplied with MSL Level 1 handling assurance.
How does SMAJ48AHE3_A/I differ from SMAJ48A-E3/5A?
SMAJ48AHE3_A/I is AEC-Q101 qualified and intended for automotive applications, whereas SMAJ48A-E3/5A is commercial-grade with no automotive qualification. Both share identical electrical parameters (VWM = 48 V, VC = 77.4 V, PPPM = 400 W), but only SMAJ48AHE3_A/I undergoes extended reliability testing per AEC-Q101. The SMAJ48AHE3_A/I also uses a different lead finish formulation optimized for automotive thermal cycling endurance.
What is the thermal resistance of SMAJ48AHE3_A/I, and how does it affect PCB layout?
The SMAJ48AHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead resistance (RθJL) of 30 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe operation under repeated surges, PCB layout must provide adequate copper area and avoid thermal bottlenecks. The SMAJ48AHE3_A/I achieves optimal thermal performance with minimum recommended pad dimensions per Vishay's DO-214AC outline drawing.
SMAJ48AHE3_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:
- 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_A/I FAQ
1.How can I place an order for SMAJ48AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48AHE3_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 SMAJ48AHE3_A/I reliable?
The price and inventory of SMAJ48AHE3_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 SMAJ48AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ48AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48AHE3_A/I?
SMAJ48AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48AHE3_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 SMAJ48AHE3_A/I?
For technical support, including SMAJ48AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48AHE3_A/I requirements.
6.How does Aetrix verify that SMAJ48AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ48AHE3_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 SMAJ48AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ48AHE3_A/I?
All SMAJ48AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48AHE3_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 SMAJ48AHE3_A/I part is unused and in its original packaging.
Return procedure for SMAJ48AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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