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Vishay General Semiconductor - Diodes Division SMAJ48CAHM3_A/H
- Part No.:
- SMAJ48CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48CAHM3_A/H.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,552
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Product details
Overview
SMAJ48CAHM3_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 or 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 (IPPM), and 400 W peak pulse power (10/1000 μs waveform), commonly deployed to protect MOSFET gates, sensor interfaces, and automotive control modules.
For engineers reviewing the SMAJ48CAHM3_A/H datasheet, SMAJ48CAHM3_A/H pinout, SMAJ48CAHM3_A/H application, or SMAJ48CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, and compatibility with automated SMT placement on PCBs requiring robust ESD and surge immunity per IEC 61000-4-2/4-5.
Technical Context
This device operates as a voltage-clamping protection element across two terminals, responding within <1 ps to transient overvoltages induced by inductive switching or lightning surges. Its bidirectional symmetry ensures identical clamping behavior in both polarities, eliminating polarity-sensitive layout constraints.
The SMAJ48CAHM3_A/H uses a glass-passivated silicon junction with low incremental surge resistance (typical <0.3 Ω), enabling stable clamping under repetitive 10/1000 μs pulses at 0.01% duty cycle. Thermal resistance is rated at 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), supporting operation up to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe working range for protected circuitry. |
| VBR min/max | 53.3 V / 58.9 V at 1 mA - Confirmed breakdown threshold window; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 77.4 V at 5.2 A - Clamped voltage seen by downstream components during 400 W transient; limits stress on ICs and MOSFETs. |
| PPPM | 400 W (10/1000 μs) - Peak surge energy handling capacity; supports industrial and automotive-level surge immunity standards. |
| ID @ VWM | 1.0 μA - Reverse leakage at stand-off voltage; negligible power loss and minimal impact on high-impedance sensor lines. |
| TJ max. | +150 °C - Maximum junction temperature rating; enables use in under-hood automotive and high-temperature industrial environments. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm × 4.50 mm footprint; compatible with standard reflow profiles and J-STD-020 MSL level 1. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, compliant with UL 94 V-0 flammability rating and JESD 22-B102 solderability requirements. Bidirectional construction means no polarity marking; both terminals are functionally symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals serve identically as clamping nodes; no cathode band marking required for bidirectional operation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control units and ADAS sensors. |
| Halogen-free & RoHS-compliant | Meets JEDEC J-STD-020 MSL level 1 and JESD 201 class 2 whisker resistance - supports green manufacturing and long-term supply chain compliance. |
| 400 W peak pulse power | Handles IEC 61000-4-5 Level 4 (4 kV line-to-line, 2 kV line-to-ground) surges without degradation when mounted on 5.0 mm × 5.0 mm copper pads. |
| Fast response time | <1 ps junction response enables clamping before sensitive CMOS inputs or gate oxides experience damaging overvoltage stress. |
| Low clamping ratio (VC/VBR) | ~1.42 (77.4 V / 54.6 V avg) - tighter clamping margin than standard Zener-based protectors, reducing risk of secondary overstress. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed microcontroller power rails from load-dump transients and alternator ripple in body control modules. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed between VCC and GND, acting as last-line defense against >100 V spikes lasting up to 400 ms. Use Value: Limits rail voltage to ≤77.4 V during 400 W surges, preventing brownout resets and latch-up in automotive-grade MCUs. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loops) of pressure or temperature transmitters from ESD and field-induced surges. IC Role / Device Role / Timing Role: Bidirectional shunt protector across signal pair, absorbing ±8 kV contact ESD per IEC 61000-4-2 without affecting baseline accuracy. Use Value: Maintains sub-μA leakage at 48 V operating point, preserving loop integrity while clamping transients to safe levels for op-amp input stages. |
| Consumer USB Port Surge Suppression | Telecom Ethernet PHY Protection |
|
Use Scenario: Safeguarding USB 2.0 data lines (D+/D−) and VBUS in portable docking stations exposed to hot-plug and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp integrated into common-mode choke filter network upstream of USB transceiver. Use Value: Delivers <1 pF junction capacitance (per fig. 4), ensuring signal integrity up to 480 Mbps while suppressing ±15 kV air-gap ESD. |
Use Scenario: Protecting 10/100BASE-TX Ethernet PHY differential pairs from lightning-induced surges entering via RJ45 connectors in outdoor access points. IC Role / Device Role / Timing Role: Paired SMAJ48CAHM3_A/H devices placed line-to-line and line-to-ground on transformer secondary side. Use Value: Withstands 10/700 μs telecom surges up to 1 kV (IEC 61000-4-5) due to 400 W rating and symmetrical clamping, avoiding data corruption or PHY latch-up. |
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/H | Same electrical specs and AEC-Q101 qualification, but RoHS-compliant without halogen-free designation (Pb-free, not Br/Cl-free). | Acceptable for commercial/industrial use where halogen-free materials are not mandated by OEM or regional regulations. | Select SMAJ48CAHE3_A/H if halogen content restrictions do not apply and cost optimization is prioritized. |
| SMBJ48CAHM3_A/H | Same VWM, VBR, VC, and AEC-Q101 rating, but in larger SMB (DO-214AA) package with higher thermal mass (RθJA = 80 °C/W vs. 120 °C/W). | Better suited for higher average power dissipation scenarios or less dense board layouts where footprint size permits. | Choose SMBJ48CAHM3_A/H when thermal derating margins are tight or when legacy SMB footprints are already established. |
Compared with SMAJ48CAHE3_A/H, the SMAJ48CAHM3_A/H adds halogen-free compliance without sacrificing performance; versus SMBJ48CAHM3_A/H, it trades thermal efficiency for space-constrained designs where SMA's 5.28 mm × 4.50 mm footprint enables denser routing near IC pins.
Availability
SMAJ48CAHM3_A/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, consumer docking stations, and telecom edge equipment requiring stable component supply with full traceability and lifecycle management.
Supply support for SMAJ48CAHM3_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, precision, and application-specific validation.
The SMAJ series was engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where failure modes must be mitigated without compromising signal fidelity or thermal stability.
FAQ
What does the "HM3" suffix indicate in SMAJ48CAHM3_A/H?
The "HM3" suffix denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Specifically, "H" indicates AEC-Q101 qualification, "M" signifies halogen-free molding compound, and "3" confirms RoHS compliance. This makes SMAJ48CAHM3_A/H suitable for automotive applications requiring strict material compliance and extended reliability validation beyond commercial-grade parts.
Is SMAJ48CAHM3_A/H unidirectional or bidirectional?
SMAJ48CAHM3_A/H is a bidirectional TVS diode, as confirmed by the "CA" suffix in its part number. It provides symmetrical clamping behavior in both polarities, with identical breakdown and clamping characteristics regardless of voltage polarity - ideal for AC-coupled lines, differential signals, or circuits where polarity cannot be guaranteed.
What is the maximum clamping voltage of SMAJ48CAHM3_A/H and under what test condition?
The maximum clamping voltage of SMAJ48CAHM3_A/H is 77.4 V, measured at a peak pulse current (IPPM) of 5.2 A using the standardized 10/1000 μs double-exponential surge waveform. This value represents the worst-case voltage imposed on protected circuitry during a 400 W transient event, ensuring downstream components remain within safe operating limits.
Can SMAJ48CAHM3_A/H replace SMAJ48A in a design?
No - SMAJ48A is unidirectional (anode/cathode marked), while SMAJ48CAHM3_A/H is bidirectional with no polarity marking. Substituting them requires verifying circuit topology: SMAJ48CAHM3_A/H may be used only where bidirectional clamping is acceptable and no DC bias polarity dependency exists. Direct replacement is not recommended without layout and functional validation.
Does SMAJ48CAHM3_A/H meet automotive qualification standards?
Yes - SMAJ48CAHM3_A/H is explicitly AEC-Q101 qualified, as documented in Vishay's ordering information table and product family specifications. This certification covers stress tests including HTGB, H3TRB, TC, and ESD, confirming suitability for automotive powertrain, chassis, and infotainment systems operating in temperature ranges from −55 °C to +150 °C.
SMAJ48CAHM3_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:
- 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/H FAQ
1.How can I place an order for SMAJ48CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48CAHM3_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 SMAJ48CAHM3_A/H reliable?
The price and inventory of SMAJ48CAHM3_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 SMAJ48CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ48CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48CAHM3_A/H?
SMAJ48CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48CAHM3_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 SMAJ48CAHM3_A/H?
For technical support, including SMAJ48CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48CAHM3_A/H requirements.
6.How does Aetrix verify that SMAJ48CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ48CAHM3_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 SMAJ48CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ48CAHM3_A/H?
All SMAJ48CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48CAHM3_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 SMAJ48CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ48CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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