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Vishay General Semiconductor - Diodes Division SMAJ48CAHM3_A/I
- Part No.:
- SMAJ48CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48CAHM3_A/I.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,107
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Product details
Overview
SMAJ48CAHM3_A/I from Vishay General Semiconductor is a bidirectional 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 (IPPM), and 400 W peak pulse power rating with 10/1000 μs waveform - ideal for safeguarding automotive sensor signal lines against ESD and load-switching transients.
For engineers reviewing the SMAJ48CAHM3_A/I datasheet, SMAJ48CAHM3_A/I pinout, SMAJ48CAHM3_A/I application, or SMAJ48CAHM3_A/I equivalent, this device is evaluated for bidirectional surge suppression in 12 V/24 V automotive subsystems, industrial I/O interfaces, and telecom line protection where low clamping voltage, fast response (<1 ns), and AEC-Q101 qualification are critical selection criteria.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR min/max (53.3 V / 58.9 V), VC = 77.4 V at IPPM = 5.2 A, and ID ≤ 1.0 μA at VWM = 48 V. Its glass-passivated junction ensures stable leakage and low capacitance (typ. <100 pF at 1 MHz), while thermal resistance RθJA = 120 °C/W supports operation up to TJ = 150 °C.
The device complies with AEC-Q101 stress testing and meets UL 497B recognition (QVGQ2). Its halogen-free, RoHS-compliant HM3 suffix indicates qualification for automotive-grade reliability, with MSL Level 1 moisture sensitivity and 260 °C lead-free reflow compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for 48 V nominal systems. |
| VBR (min/max) | 53.3 V / 58.9 V at IT = 1 mA - Ensures reliable turn-on above system operating voltage with tight tolerance for predictable protection threshold. |
| VC @ IPPM | 77.4 V at 5.2 A - Clamped voltage during 10/1000 μs surge; limits downstream IC stress to safe levels in automotive 12 V/24 V environments. |
| PPPM | 400 W - Peak pulse power handling capability; sustains repetitive 0.01% duty cycle surges per ISO 7637-2 Pulse 1/2/5a without degradation. |
| ID @ VWM | ≤1.0 μA - Ultra-low reverse leakage preserves signal integrity and battery life in always-on automotive modules. |
| TJ max. | +150 °C - Enables deployment in under-hood ECUs and powertrain control units exposed to high ambient temperatures. |
| Package | SMA (DO-214AC) - Surface-mount footprint compatible with automated assembly; 0.208" x 0.157" body with matte tin leads solderable per J-STD-002. |
Pinout & Package
Package: SMA (DO-214AC), bidirectional configuration with no polarity marking - symmetrical terminals suitable for AC-coupled or floating signal lines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; conducts surge current in either direction when voltage exceeds VBR magnitude - eliminates orientation concerns during placement. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment - guarantees reliability under temperature cycling, humidity, and mechanical shock. |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental regulations and enables use in Tier 1 automotive supply chains requiring material compliance documentation (e.g., IEC 61249-2-21). |
| 400 W peak pulse power (10/1000 μs) | Withstands ISO 7637-2 Pulse 5a (50 V, 500 ms) and IEC 61000-4-5 Combination Wave (1 kV/42 Ω) without failure - protects CAN, LIN, and analog sensor inputs. |
| Low clamping ratio (VC/VBR ≈ 1.34) | Minimizes voltage overshoot during transients - critical for protecting 5 V/3.3 V logic interfaces connected to 48 V domains via level-shifting circuits. |
| MSL Level 1, 260 °C reflow | Supports single-pass lead-free assembly without baking or special handling - reduces manufacturing cost and avoids moisture-induced popcorning. |
Applications
| Automotive Sensor Protection | Industrial Analog I/O Protection |
|---|---|
|
Use Scenario: Protecting ABS wheel speed sensor outputs exposed to inductive kickback from solenoid drivers in 24 V chassis systems. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential signal pair (e.g., GMR sensor output) to limit transients to <80 V. Use Value: Prevents latch-up or damage to downstream op-amps and ADCs by clamping ISO 7637-2 Pulse 1 (−100 V, 2 Ω) to 77.4 V at 5.2 A. |
Use Scenario: Safeguarding 4–20 mA current loop transmitter outputs in factory automation PLC modules. IC Role / Device Role / Timing Role: Parallel-connected TVS on loop supply line to absorb lightning-induced surges and relay contact bounce energy. Use Value: Maintains loop integrity during 1 kV/42 Ω IEC 61000-4-5 surges by limiting voltage excursion to 77.4 V - avoids current source saturation or DAC damage. |
| Telecom Line Interface | Consumer Power Adapter ESD Protection |
|
Use Scenario: Shielding RS-485 transceiver bus lines (A/B) in outdoor base station equipment subject to induced lightning surges. IC Role / Device Role / Timing Role: Bidirectional TVS placed between each data line and ground to shunt common-mode transients. Use Value: Achieves >25 kV HBM ESD immunity and clamps 10/1000 μs 1 kV surges to <80 V - preserves signal eye diagram and prevents transceiver latch-up. |
Use Scenario: Adding secondary surge protection on DC output rails of USB-C PD adapters after primary MOV/clamp stage. IC Role / Device Role / Timing Role: Final-stage TVS on +20 V PD output to suppress residual switching noise and ESD events before connector. Use Value: Limits voltage spikes to 77.4 V during 8 kV contact discharge - protects connected devices' USB-PD controllers and port power switches. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48CAHE3_A/I | Same electrical specs (VWM = 48 V, VC = 77.4 V), but RoHS-compliant commercial grade (not AEC-Q101 qualified); uses standard tin plating instead of halogen-free formulation. | Lacks automotive qualification - suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select when cost sensitivity outweighs automotive reliability requirements and halogen-free materials are not required. |
| SMBJ48CAHM3_A/I | Same VWM/VC specs but in larger SMB (DO-214AA) package; higher PPPM = 600 W, lower RθJA = 80 °C/W, and IPPM = 7.7 A. | Better thermal performance and surge margin - used where board space allows and higher energy transients are expected. | Choose when system-level surge testing exceeds 400 W or sustained ambient temperatures exceed 125 °C. |
Compared with SMAJ48CAHM3_A/I, SMAJ48CAHE3_A/I offers identical protection performance without automotive qualification, while SMBJ48CAHM3_A/I delivers higher surge capacity and improved thermal dissipation at the cost of larger PCB footprint - enabling tiered design choices based on reliability, thermal, and space constraints.
Availability
SMAJ48CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial analog I/O safeguarding, and telecom line interface hardening requiring stable component supply, AEC-Q101 traceability, and halogen-free compliance.
Supply support for SMAJ48CAHM3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific optimization.
The SMAJ series targets high-reliability transient suppression in automotive, industrial, and telecom infrastructure - engineered for fast response, low clamping, and robustness under harsh environmental stress.
FAQ
What is the clamping voltage of SMAJ48CAHM3_A/I at its rated peak pulse current?
The SMAJ48CAHM3_A/I has a maximum clamping voltage (VC) of 77.4 V at its specified 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 voltage thresholds during transient events, and it is guaranteed across the full operating temperature range of −55 °C to +150 °C. The SMAJ48CAHM3_A/I maintains this clamping performance consistently due to its glass-passivated junction and low dynamic impedance.
Is SMAJ48CAHM3_A/I qualified for automotive applications?
Yes, SMAJ48CAHM3_A/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet 88390 (Revision 09-Jan-2024). This qualification covers stress tests including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing - making SMAJ48CAHM3_A/I suitable for under-hood and safety-critical automotive subsystems such as body control modules and ADAS sensor interfaces.
What does the 'HM3' suffix indicate in SMAJ48CAHM3_A/I?
The 'HM3' suffix in SMAJ48CAHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification - distinguishing it from commercial-grade 'E3' or non-halogen-free 'HE3' variants. It specifies matte tin-plated leads compliant with J-STD-002, MSL Level 1 rating for 260 °C lead-free reflow, and adherence to JESD201 Class 2 whisker resistance. This suffix directly identifies the part's suitability for automotive production and environmentally regulated markets.
How does SMAJ48CAHM3_A/I differ from unidirectional SMAJ48A variants?
SMAJ48CAHM3_A/I is bidirectional, meaning it provides symmetrical clamping in both polarities with identical VBR (53.3–58.9 V) and VC (77.4 V) characteristics, whereas unidirectional SMAJ48A has a cathode band and only clamps in reverse bias. This makes SMAJ48CAHM3_A/I ideal for AC-coupled or floating signal paths like RS-485 buses or differential sensor outputs, eliminating polarity concerns during PCB layout and assembly - unlike SMAJ48A, which requires correct orientation relative to ground.
What is the maximum operating junction temperature for SMAJ48CAHM3_A/I?
The maximum operating junction temperature (TJ max.) for SMAJ48CAHM3_A/I is +150 °C, as specified in the Absolute Maximum Ratings table of Vishay's datasheet 88390. This rating enables reliable operation in high-ambient environments such as engine compartments or industrial motor drives. Derating curves in Figure 2 confirm that the device retains ≥80% of its 400 W peak pulse power capability even at TJ = 125 °C, supporting robust thermal design in compact enclosures.
SMAJ48CAHM3_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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ48CAHM3_A/I FAQ
1.How can I place an order for SMAJ48CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48CAHM3_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 SMAJ48CAHM3_A/I reliable?
The price and inventory of SMAJ48CAHM3_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 SMAJ48CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ48CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48CAHM3_A/I?
SMAJ48CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48CAHM3_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 SMAJ48CAHM3_A/I?
For technical support, including SMAJ48CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48CAHM3_A/I requirements.
6.How does Aetrix verify that SMAJ48CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ48CAHM3_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 SMAJ48CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ48CAHM3_A/I?
All SMAJ48CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48CAHM3_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 SMAJ48CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ48CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ48CAHM3_A/I Tags
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