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Vishay General Semiconductor - Diodes Division SMAJ48CAHM3/H
- Part No.:
- SMAJ48CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48CAHM3/H.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,741
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Product details
Overview
SMAJ48CAHM3/H 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, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ48CAHM3/H datasheet, SMAJ48CAHM3/H pinout, SMAJ48CAHM3/H application, or SMAJ48CAHM3/H equivalent, this device is evaluated for ESD and surge immunity in AEC-Q101-compliant automotive subsystems, bidirectional signal line protection, low-capacitance interface safeguarding, and high-reliability industrial I/O conditioning where clamping precision and thermal stability are critical.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering identical clamping behavior during positive and negative transients - essential for protecting AC-coupled or floating signal paths. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1.0 ns), while the MSL Level 1 moisture sensitivity rating supports standard reflow without preconditioning.
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 300 W derated pulse power above 78 V does not apply here; SMAJ48CAHM3/H maintains full 400 W capability per the 10/1000 μs waveform specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 48 V - Maximum continuous reverse operating voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 53.3–58.9 V at 1 mA - Voltage at which device transitions into avalanche conduction; ensures reliable turn-on during overvoltage events. |
| VC (Clamping Voltage) | 77.4 V at IPPM = 5.2 A - Peak voltage seen by protected circuit during 10/1000 μs surge; determines stress level on downstream components. |
| PPPM (Peak Pulse Power) | 400 W - Surge energy handling capacity under standardized 10/1000 μs waveform; validates suitability for IEC 61000-4-5 Level 3/4 threats. |
| ID (Reverse Leakage) | ≤1.0 μA at 48 V - Minimal standby current draw; preserves signal integrity and battery life in always-on systems. |
| TJ max. | 150 °C - Maximum allowable junction temperature; enables operation in under-hood automotive environments and sealed industrial enclosures. |
| Package | SMA (DO-214AC) - Surface-mount outline with 2.54 mm lead pitch; compatible with automated placement and IPC-7351B land patterns. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1, RoHS-compliant and halogen-free (HM3 suffix). Bidirectional configuration has no polarity marking - terminals are symmetrical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction | Either terminal serves as anode or cathode depending on transient polarity; no band marking required. |
| Terminal 1 | Line-side connection | Connected to protected signal or power rail; must be routed with minimal trace inductance for effective clamping. |
| Terminal 2 | Reference-side connection | Tied to local ground or return path; requires low-impedance grounding to sustain clamping performance. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance - suitable for engine control, ADAS, and body electronics. |
| 400 W peak pulse power | Withstands IEC 61000-4-5 combination wave surges up to 400 W without degradation, enabling single-device protection for 12 V/24 V systems. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage overshoot during transients - reduces risk of latch-up or gate oxide damage in connected MOSFETs and ICs. |
| MSL Level 1, 260 °C peak reflow | Eliminates need for moisture-sensitive handling or baking prior to assembly - streamlines SMT production for high-volume automotive modules. |
| Halogen-free & RoHS-compliant (HM3) | Meets automotive OEM environmental requirements and JEDEC J-STD-20/201 standards for long-term solder joint reliability and whisker resistance. |
Applications
| Automotive Power Line Protection | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Protecting 12 V supply inputs in engine control units (ECUs) against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed between battery feed and DC-DC converter input. Use Value: Limits transient voltage to ≤77.4 V, preventing damage to 40 V-rated input stages and maintaining system uptime during cranking events. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops) in pressure/temperature transmitters exposed to field wiring surges. IC Role / Device Role / Timing Role: Bidirectional shunt protector on differential signal pair referenced to chassis ground. Use Value: Clamps ±1 kV EFT bursts without forward conduction, preserving loop accuracy and avoiding false readings during EMC testing. |
| Telecom Interface Port Protection | Consumer USB Data Line Guarding |
Use Scenario: Shielding RS-485 transceiver I/O pins in base station remote units subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly at connector entry point, before ESD diode array. Use Value: Absorbs >30 A surge current while adding <0.5 pF parasitic capacitance - maintains signal integrity up to 10 Mbps. |
Use Scenario: Adding secondary surge resilience to USB 2.0 D+/D− lines in smart home hubs near AC mains-connected peripherals. IC Role / Device Role / Timing Role: Secondary-level TVS complementing integrated USB port ESD protection. Use Value: Extends system-level surge withstand from ±8 kV (IEC 61000-4-2) to ±1 kV (IEC 61000-4-5) without degrading eye diagram or insertion loss. |
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/H | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification. | Acceptable for commercial-automotive hybrids where halogen content is unrestricted. | Select when cost sensitivity outweighs halogen-free requirement and HM3 is unavailable. |
| SMBJ48CAHM3 | Same VWM/VBR/VC ratings but in SMB (DO-214AA) package - 20 % larger footprint and 10 % higher RθJA (130 °C/W). | Better suited for higher-power derating scenarios or legacy layouts with SMB pad stacks. | Choose only if board space allows larger package or thermal margin exceeds 120 °C/W requirement. |
Compared with SMAJ48CAHM3/H, SMAJ48CAHE3/H offers identical protection performance without halogen-free assurance, while SMBJ48CAHM3 trades compactness for slightly reduced thermal efficiency - making SMAJ48CAHM3/H optimal for space-constrained, thermally demanding AEC-Q101 designs.
Availability
SMAJ48CAHM3/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, telecom data ports, and consumer USB peripheral protection requiring stable component supply across multi-year production cycles.
Supply support for SMAJ48CAHM3/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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was engineered for high-speed, high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure modes must be mitigated without compromising signal fidelity or thermal headroom.
FAQ
What is the clamping voltage of SMAJ48CAHM3/H at its rated peak pulse current?
The SMAJ48CAHM3/H has a maximum clamping voltage (VC) of 77.4 V at its specified peak pulse current (IPPM) of 5.2 A under the 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024, ensuring predictable overvoltage limiting during surge events in automotive and industrial circuits using the SMAJ48CAHM3/H.
Is SMAJ48CAHM3/H qualified for automotive use?
Yes, SMAJ48CAHM3/H is AEC-Q101 qualified, as indicated by the "HM3" suffix and documented in Vishay's ordering information and thermal characteristics tables. It undergoes rigorous stress testing including temperature cycling, high-temperature reverse bias, and surge endurance - making it suitable for under-hood and chassis-mounted applications where the SMAJ48CAHM3/H provides certified transient protection.
How does the bidirectional design of SMAJ48CAHM3/H affect its PCB layout?
The bidirectional nature of SMAJ48CAHM3/H eliminates polarity concerns: no cathode band marking is present, and either terminal may connect to line or reference. Layout requires symmetric, low-inductance routing to both terminals - especially critical for high-frequency surge suppression - and adherence to the recommended 0.2" × 0.2" copper pad per terminal to maintain thermal and electrical performance specified for the SMAJ48CAHM3/H.
What is the maximum operating temperature for SMAJ48CAHM3/H?
The SMAJ48CAHM3/H has a maximum junction temperature (TJ max.) of +150 °C, validated per JEDEC standards and listed in the "Maximum Ratings" table of its datasheet. This rating enables reliable operation in high-ambient environments such as engine compartments or enclosed industrial drives, provided board-level thermal design sustains junction temperature below this limit for the SMAJ48CAHM3/H.
Does SMAJ48CAHM3/H meet RoHS and halogen-free requirements?
Yes, the "HM3" suffix in SMAJ48CAHM3/H explicitly denotes halogen-free, RoHS-compliant construction per Vishay's material categorization documentation (www.vishay.com/doc?99912). It satisfies automotive OEM environmental mandates and passes JEDEC J-STD-20 reflow and JESD22-B102 solderability tests - confirming compliance status for the SMAJ48CAHM3/H without requiring additional certification review.
SMAJ48CAHM3/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:
- 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/H FAQ
1.How can I place an order for SMAJ48CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48CAHM3/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 SMAJ48CAHM3/H reliable?
The price and inventory of SMAJ48CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ48CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ48CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48CAHM3/H?
SMAJ48CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48CAHM3/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 SMAJ48CAHM3/H?
For technical support, including SMAJ48CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48CAHM3/H requirements.
6.How does Aetrix verify that SMAJ48CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ48CAHM3/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 SMAJ48CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ48CAHM3/H?
All SMAJ48CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48CAHM3/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 SMAJ48CAHM3/H part is unused and in its original packaging.
Return procedure for SMAJ48CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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