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Vishay General Semiconductor - Diodes Division SMAJ110CAHM3/I
- Part No.:
- SMAJ110CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ110CAHM3/I.pdf
- Description:
- TVS DIODE 110VWM 177VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,097
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Product details
Overview
SMAJ110CAHM3/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal and power lines. It features a 110 V stand-off voltage (VWM), 122–135 V breakdown voltage (VBR) at 1 mA, 177 V maximum clamping voltage (VC) at 1.7 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform), targeting protection of MOSFETs, ICs, and sensor interfaces in automotive and industrial systems.
For engineers reviewing the SMAJ110CAHM3/I datasheet, SMAJ110CAHM3/I pinout, SMAJ110CAHM3/I application, or SMAJ110CAHM3/I equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), junction temperature range (−55 to +150 °C), and halogen-free RoHS-compliant construction per JESD201 Class 2 whisker testing.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR min/max (122–135 V), VC (177 V), and IPPM (1.7 A) in either direction. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1.0 ps), enabling suppression of ESD, lightning-induced surges, and inductive switching spikes before sensitive downstream circuitry is damaged.
The device is rated for 3.3 W steady-state power dissipation at TA = 50 °C and exhibits a low incremental surge resistance, critical for maintaining tight clamping under high-current transients. Its MSL Level 1 rating (peak reflow ≤260 °C) and matte tin-plated leads support robust automated SMT assembly without solderability degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 110 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 12 V–48 V bus protection. |
| VBR (min/max) | 122 V / 135 V at IT = 1 mA - Confirmed breakdown threshold ensuring reliable turn-on during overvoltage events. |
| VC @ IPPM | 177 V at IPPM = 1.7 A - Clamped voltage seen by protected circuit during 10/1000 μs surge; limits stress on downstream components. |
| PPPM | 400 W (≤78 V); 300 W (>78 V) - Peak pulse power handling capability with standard 10/1000 μs waveform per IEC 61000-4-5. |
| TJ max. | +150 °C - Maximum junction temperature enabling operation in under-hood automotive or industrial ambient environments. |
| RθJA | 120 °C/W - Thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs heatsinking requirements. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per AEC specification. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, MSL Level 1, 260 °C peak reflow. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H). Cathode band absent - bidirectional symmetry eliminates polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (positive polarity) | Accepts surge current during positive half-cycle; connects to line being protected. |
| Cathode | Transient current entry point (negative polarity) | Accepts surge current during negative half-cycle; symmetrical with Anode for bidirectional clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both directions enables single-device protection of AC-coupled or floating signal lines. |
| 400 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 12 V–48 V rails when properly laid out with 0.2" × 0.2" copper pads. |
| AEC-Q101 qualification | Validated for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. |
| Halogen-free & RoHS | HM3 suffix denotes halogen-free molding compound and RoHS compliance, meeting automotive OEM material restrictions. |
| Low leakage & fast response | <1.0 μA ID at 110 V and sub-nanosecond response ensure minimal system loading and effective ESD/lighning suppression. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between connector and transceiver IC input pins. Use Value: Limits transient voltage to ≤177 V during 10/1000 μs surges, preventing latch-up or gate oxide damage in 3.3 V/5 V interface ICs. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers against field-wiring induced transients and relay coil flyback. IC Role / Device Role / Timing Role: Parallel-connected TVS on 24 V DC input terminals, shunting surge energy to ground before reaching optocoupler or MCU GPIO. Use Value: Withstands repetitive 400 W pulses at 0.01% duty cycle, enabling long-term reliability in factory automation environments. |
| Telecom Power Rail Protection | Consumer Device USB/DisplayPort ESD Guard |
|
Use Scenario: Clamping 48 V PoE (Power over Ethernet) data line surges in network switches and IP cameras. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential pairs or between power rail and ground near RJ45 magnetics. Use Value: 122–135 V VBR aligns with IEEE 802.3af/at voltage margins; 177 V VC ensures PHY ICs remain within absolute maximum ratings. |
Use Scenario: Secondary-level ESD protection on high-speed interfaces (USB 2.0, HDMI, DisplayPort) in laptops and monitors. IC Role / Device Role / Timing Role: Low-capacitance TVS (CJ ≈ 50 pF typical at 0 V) placed inline with signal traces before connector. Use Value: Sub-nanosecond response and <1.0 μA leakage preserve signal integrity while passing IEC 61000-4-2 ±15 kV contact discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ110CAHE3/I | Same electrical specs; RoHS-compliant but not halogen-free; AEC-Q101 qualified; HE3 suffix. | Preferred where halogen content is unrestricted but automotive qualification is required. | Select SMAJ110CAHE3/I if halogen-free requirement is waived and cost sensitivity favors commercial-grade variant. |
| SMBJ110CAHM3/I | Same VWM/VBR/VC, but SMB (DO-214AA) package: 5.3 mm × 4.1 mm footprint, higher RθJA (100 °C/W), 600 W PPPM rating. | Better suited for higher-power surges where board space allows larger package and thermal relief. | Choose SMBJ110CAHM3/I when 600 W surge handling is needed and PCB layout accommodates larger SMB outline. |
Compared with SMAJ110CAHM3/I, SMAJ110CAHE3/I offers identical protection performance without halogen-free constraint, while SMBJ110CAHM3/I trades smaller footprint for higher pulse power and lower thermal resistance-enabling design flexibility based on space, power, and material compliance priorities.
Availability
SMAJ110CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom PoE ports, and consumer high-speed data line protection requiring stable component supply and full traceability.
Supply support for SMAJ110CAHM3/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, efficiency, and application-specific optimization.
The SMAJ series was engineered for high-reliability transient suppression in space-constrained, high-surge environments-including automotive, industrial, and telecom infrastructure-balancing low profile, AEC-Q101 validation, and precise clamping accuracy.
FAQ
What does the "HM3" suffix mean in SMAJ110CAHM3/I?
The HM3 suffix in SMAJ110CAHM3/I indicates halogen-free, RoHS-compliant construction with matte tin-plated leads, JESD201 Class 2 whisker resistance, and AEC-Q101 qualification. It distinguishes this variant from non-halogen-free (HE3) or commercial-only (E3/M3) versions, confirming compliance with strict automotive material standards.
Is SMAJ110CAHM3/I suitable for protecting 48 V automotive power rails?
Yes, SMAJ110CAHM3/I is suitable for 48 V automotive power rail protection. Its 110 V stand-off voltage provides adequate margin above 48 V nominal, and its 177 V clamping voltage ensures downstream 100 V-rated MOSFETs and regulators remain within safe operating limits during ISO 7637-2 pulse 5a/b events.
How does SMAJ110CAHM3/I differ from unidirectional SMAJ110A variants?
SMAJ110CAHM3/I is bidirectional with symmetrical clamping in both polarities and no cathode band marking, whereas unidirectional SMAJ110A has polarity-sensitive operation, a visible cathode band, and only clamps reverse-voltage transients. The "CA" suffix explicitly denotes bidirectional functionality required for AC or floating-line protection.
What is the maximum allowable PCB pad size for optimal thermal performance of SMAJ110CAHM3/I?
For optimal thermal performance, SMAJ110CAHM3/I should be mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the Vishay datasheet. Larger pads improve heat dissipation but do not alter the rated 120 °C/W RθJA; exceeding this size yields diminishing returns without internal thermal vias.
Does SMAJ110CAHM3/I meet IEC 61000-4-2 and IEC 61000-4-5 immunity standards?
SMAJ110CAHM3/I is designed to support system-level compliance with IEC 61000-4-2 (ESD) and IEC 61000-4-5 (surge) when implemented per layout guidelines. Its 177 V clamping voltage and 1.7 A IPPM enable protection against ±15 kV contact discharge and 4 kV/2 Ω surge waveforms-verified in reference designs using this exact device.
SMAJ110CAHM3/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):
- 110V
- Voltage - Breakdown (Min):
- 122V
- Voltage - Clamping (Max) @ Ipp:
- 177V
- Current - Peak Pulse (10/1000µs):
- 1.7A
- 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)
SMAJ110CAHM3/I FAQ
1.How can I place an order for SMAJ110CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ110CAHM3/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 SMAJ110CAHM3/I reliable?
The price and inventory of SMAJ110CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ110CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMAJ110CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ110CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ110CAHM3/I?
SMAJ110CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ110CAHM3/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 SMAJ110CAHM3/I?
For technical support, including SMAJ110CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ110CAHM3/I requirements.
6.How does Aetrix verify that SMAJ110CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ110CAHM3/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 SMAJ110CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMAJ110CAHM3/I?
All SMAJ110CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ110CAHM3/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 SMAJ110CAHM3/I part is unused and in its original packaging.
Return procedure for SMAJ110CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ110CAHM3/I Tags
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Toshiba Semiconductor and Storage
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