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Vishay General Semiconductor - Diodes Division SMAJ48CAHM3/I
- Part No.:
- SMAJ48CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48CAHM3/I.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,464
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Product details
Overview
SMAJ48CAHM3/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust ESD and surge protection on signal/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 (IPPM), and 400 W peak pulse power (10/1000 μs waveform), targeting automotive-grade protection in sensor interfaces and power rails.
For engineers reviewing the SMAJ48CAHM3/I datasheet, SMAJ48CAHM3/I pinout, SMAJ48CAHM3/I application, or SMAJ48CAHM3/I equivalent, this device is evaluated for bidirectional overvoltage clamping in AEC-Q101-compliant automotive subsystems, industrial I/O protection, and high-reliability DC power line safeguarding where low clamping ratio and MSL Level 1 solderability are critical.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or floating signal paths without polarity sensitivity. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at 48 V), while the low incremental surge resistance supports fast energy dissipation during transients.
The device is rated for 150 °C maximum junction temperature and exhibits a typical thermal resistance of 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads. Its 10/1000 μs waveform response delivers repeatable 400 W surge handling up to 78 V, derating to 300 W above that threshold per Vishay's published derating curve.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC/AC signal swing margin. |
| VBR min/max | 53.3 V / 58.9 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on within spec across process variation. |
| VC @ IPPM | 77.4 V at 5.2 A - Clamping voltage under 10/1000 μs surge; determines protected circuit's maximum transient exposure. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak pulse power rating defining single-event surge energy absorption capability. |
| ID @ VWM | ≤1.0 μA - Reverse leakage current at stand-off voltage; critical for low-power sensor and battery-backed circuits. |
| TJ max. | +150 °C - Maximum junction temperature enabling operation in under-hood automotive environments. |
| Package | SMA (DO-214AC) - Surface-mount package with 5.28 mm length, 4.50 mm width, and 2.29 mm height; compatible with automated placement. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1 compliant (peak reflow 260 °C), halogen-free and RoHS-compliant (HM3 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal A | One side of symmetrical PN junction; no polarity marking required for bidirectional operation. |
| Cathode | Terminal K | Other side of symmetrical PN junction; identical electrical behavior to Anode in CA-type devices. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces. |
| 400 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes voltage overshoot during transients, protecting downstream 5 V or 48 V logic and analog ICs. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free reflow assembly without moisture-related popcorn failure. |
| Halogen-free, RoHS-compliant (HM3) | Meets automotive environmental compliance requirements (e.g., ELV, IMDS) and end-of-life recycling mandates. |
Applications
| Automotive Sensor Interface Protection | Industrial CAN Bus Line Protection |
|---|---|
|
Use Scenario: Protecting LIN/CAN transceiver inputs and outputs against load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt surge energy before reaching transceiver pins. Use Value: Maintains signal integrity under 10/1000 μs surges up to 400 W while holding clamped voltage below 78 V, preserving transceiver functional safety limits. |
Use Scenario: Safeguarding differential CAN H/L lines in factory automation controllers exposed to motor switching noise. IC Role / Device Role / Timing Role: Symmetric TVS pair (one per line) providing common-mode and differential-mode transient suppression. Use Value: Enables reliable CAN communication at 1 Mbps with <1.0 μA leakage at 48 V, minimizing bus loading and false dominant detection. |
| 48 V DC Power Rail Protection | Smart Building PoE+ Data Line Guard |
|
Use Scenario: Input-stage surge protection for 48 V telecom rectifiers and server PSUs subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device upstream of DC-DC converters, sized to absorb 400 W pulses without thermal runaway. Use Value: Limits rail voltage excursion to ≤77.4 V during 5.2 A transients, preventing overvoltage shutdown of downstream 50 V-rated MOSFETs and controllers. |
Use Scenario: Protecting Ethernet PHY data pairs (pins 1–2, 3–6) in IEEE 802.3at PoE+ injectors/splitters. IC Role / Device Role / Timing Role: Bidirectional TVS on each differential pair to clamp ESD (IEC 61000-4-2 ±15 kV) and surge (IEC 61000-4-5) events. Use Value: Delivers <1.0 μA leakage at 48 V bias, avoiding PHY bias current errors, while clamping sub-100 ns ESD events to <80 V. |
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/I | Same electrical specs, but RoHS-compliant without halogen-free certification (E3 vs HM3). | Lacks halogen-free compliance required for certain automotive OEMs and EU Tier 1 suppliers. | Select SMAJ48CAHM3/I when halogen-free material declaration (IMDS, PPAP) is mandatory. |
| SMBJ48CAHM3/I | Same VWM/VBR/VC, but SMB (DO-214AA) package: 5.29 mm × 4.60 mm, higher 600 W PPPM rating. | Offers higher surge margin and lower RθJA (90 °C/W), but requires larger PCB footprint. | Choose SMBJ48CAHM3/I for designs needing >400 W headroom or improved thermal performance in confined layouts. |
Compared with SMAJ48CAHE3/I, SMAJ48CAHM3/I adds halogen-free assurance for stringent automotive supply chains; versus SMBJ48CAHM3/I, it trades 200 W pulse power and thermal advantage for space-constrained SMA footprint compatibility.
Availability
SMAJ48CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial CAN bus safeguarding, and 48 V DC power rail surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SMAJ48CAHM3/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 automotive qualification.
The SMAJ series is engineered specifically for high-speed transient suppression in harsh environments, supporting AEC-Q101 compliance and industrial surge immunity standards like IEC 61000-4-5.
FAQ
What is the clamping voltage of SMAJ48CAHM3/I at its rated peak pulse current?
The SMAJ48CAHM3/I has a maximum clamping voltage (VC) of 77.4 V at 5.2 A peak pulse current (IPPM) under the standardized 10/1000 μs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The clamping performance is guaranteed across the full operating temperature range of −55 °C to +150 °C, making SMAJ48CAHM3/I suitable for under-hood automotive use.
Is SMAJ48CAHM3/I certified for automotive applications?
Yes, SMAJ48CAHM3/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3_X" (where "X" denotes revision). This qualification covers stress tests including HTGB, AC/DC life test, temperature cycling, and mechanical shock-validating reliability for automotive powertrain, chassis, and body electronics. The "HM3" designation also certifies halogen-free and RoHS compliance, meeting OEM material disclosure requirements.
How does the bidirectional design of SMAJ48CAHM3/I affect its circuit implementation?
The bidirectional structure of SMAJ48CAHM3/I eliminates polarity concerns during PCB layout-no cathode band marking is present, and either terminal may connect to either side of a differential or floating line. This simplifies protection of AC-coupled interfaces (e.g., RS-485, CAN, audio lines) and enables single-device solutions for symmetric surge threats. Unlike unidirectional variants, SMAJ48CAHM3/I conducts identically in both directions above VBR, ensuring balanced clamping on positive and negative transients.
What is the maximum reverse leakage current specified for SMAJ48CAHM3/I at its stand-off voltage?
SMAJ48CAHM3/I specifies a maximum reverse leakage current (ID) of 1.0 μA at its 48 V stand-off voltage (VWM), tested at 25 °C. This ultra-low leakage preserves signal integrity in high-impedance sensor front-ends and battery-powered nodes. Leakage remains ≤5.0 μA up to +85 °C and ≤20 μA at +125 °C per Vishay's derating curves-critical for maintaining accuracy in precision analog measurement systems using SMAJ48CAHM3/I.
Can SMAJ48CAHM3/I be used in lead-free reflow processes?
Yes, SMAJ48CAHM3/I is rated MSL Level 1 per J-STD-020 and supports peak reflow temperatures up to 260 °C, fully compatible with standard lead-free (SnAgCu) soldering profiles. Its matte tin-plated leads meet J-STD-002 and JESD22-B102 solderability requirements, and the molding compound achieves UL 94 V-0 flammability rating. No pre-baking is required prior to reflow, streamlining manufacturing for high-volume automotive and industrial PCB assembly using SMAJ48CAHM3/I.
SMAJ48CAHM3/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:
- Discontinued at Digi-Key
- 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/I FAQ
1.How can I place an order for SMAJ48CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48CAHM3/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/I reliable?
The price and inventory of SMAJ48CAHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMAJ48CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48CAHM3/I?
SMAJ48CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48CAHM3/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/I?
For technical support, including SMAJ48CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48CAHM3/I requirements.
6.How does Aetrix verify that SMAJ48CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ48CAHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMAJ48CAHM3/I?
All SMAJ48CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48CAHM3/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/I part is unused and in its original packaging.
Return procedure for SMAJ48CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ48CAHM3/I Tags
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