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Vishay General Semiconductor - Diodes Division SMAJ110CA-E3/61
- Part No.:
- SMAJ110CA-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ110CA-E3/61.pdf
- Description:
- TVS DIODE 110VWM 177VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,135
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Product details
Overview
SMAJ110CA-E3/61 from Vishay General Semiconductor is a bidirectional surface-mount 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) - deployed to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ110CA-E3/61 datasheet, SMAJ110CA-E3/61 pinout, SMAJ110CA-E3/61 application, or SMAJ110CA-E3/61 equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM ≈ 1.61), AEC-Q101 qualification eligibility (via HE3 suffix variants), thermal resistance (RθJA = 120 °C/W), and compatibility with automated SMT assembly on standard PCB copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 μA leakage at 110 V), but triggers into low-impedance conduction when transient voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable avalanche behavior and fast response (<1 ns), while the bidirectional symmetry enables protection of AC-coupled or differential signal paths without polarity concerns.
The device is rated for repetitive 10/1000 μs surge pulses at 0.01% duty cycle (400 W up to 78 V; derated to 300 W above 78 V), with thermal performance validated on 0.2" × 0.2" copper pads. Junction temperature range spans −55 °C to +150 °C, supporting under-hood automotive and industrial environments where ambient temperatures exceed 85 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 110 V - Maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 122–135 V at 1 mA - Confirmed avalanche initiation range; ensures reliable triggering above system nominal voltage. |
| VC (Clamping Voltage) | 177 V at IPPM = 1.7 A - Peak voltage seen by protected circuit during standardized 10/1000 μs surge; determines downstream component stress. |
| PPPM (Peak Pulse Power) | 400 W (≤78 V), 300 W (>78 V) - Surge energy handling capacity per JEDEC JESD22-A114; defines single-event robustness. |
| ID (Reverse Leakage) | 1.0 μA max at 110 V - Low standby current preserves signal integrity and minimizes power loss in always-on circuits. |
| RθJA | 120 °C/W - Thermal resistance from junction to ambient on minimal pad layout; informs derating requirements at elevated TA. |
| Package | SMA (DO-214AC) - Industry-standard surface-mount outline; compatible with IPC-7351B footprint and reflow profiles (MSL Level 1, 260 °C peak). |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; no polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction terminals | No functional distinction between terminals; either side connects to protected line, other to ground or reference rail. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 Level 3 surges (1 kV/2 Ω) on 12 V–48 V DC rails without external series impedance. |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes overvoltage exposure to downstream ICs - critical for 100 V-rated gate drivers and analog front-ends. |
| Glass passivated junction | Ensures stable, repeatable avalanche characteristics across temperature and lifetime; eliminates parameter drift in harsh environments. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking; reduces manufacturing overhead in high-volume SMT lines. |
| AEC-Q101 qualification path | HE3/HM3 suffix variants meet automotive reliability standards - supports qualification of safety-critical modules without redesign. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protecting 24 V CAN/LIN bus interface pins from load dump and inductive switching transients in door module ECUs. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed between signal line and chassis ground, responding within <1 ns to suppress >100 V spikes. Use Value: Prevents latch-up or gate oxide damage in transceiver ICs (e.g., TJA1042) during 12 V system load dump events (ISO 7637-2 Pulse 5a). |
Use Scenario: Safeguarding 24 V digital input optocoupler inputs against field-wiring induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Primary overvoltage clamp on dry-contact input traces, placed upstream of series current-limiting resistor and opto-LED. Use Value: Maintains input logic state integrity during 1 kV ring-wave transients (IEC 61000-4-12) without false triggering or LED degradation. |
| Telecom Remote Radio Unit (RRU) | Consumer Smart Appliance Motor Driver |
Use Scenario: Clamping RS-485 data lines exposed to lightning-induced surges in outdoor base station backhaul links. IC Role / Device Role / Timing Role: Differential-mode TVS pair (one per line) referenced to common ground, leveraging bidirectional symmetry for AC-coupled signals. Use Value: Limits differential voltage to <354 V (2 × VC) during 10/700 μs telecom surges, preserving ADM3485E transceiver functionality. |
Use Scenario: Protecting half-bridge gate driver supply pins (e.g., IRS2007) from motor commutation spikes in washing machine inverters. IC Role / Device Role / Timing Role: Local clamp on 15 V bootstrap supply rail, placed adjacent to driver IC to minimize loop inductance. Use Value: Suppresses 200 V+ ringing events before they propagate to driver logic, eliminating erratic FET turn-on and shoot-through risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ110A-E3/61 | Unidirectional variant; cathode-marked; VF = 3.5 V at 25 A forward conduction. | Requires polarity-aware placement; unsuitable for AC or differential lines without external biasing. | Select only when protecting DC-only rails with known polarity and need for forward conduction capability. |
| SMBJ110CA-E3/52 | Same VWM/VC specs but in SMB (DO-214AA) package; 600 W PPPM rating; RθJA = 90 °C/W. | Higher power handling and better thermal performance, but 30% larger footprint and higher cost. | Choose when surge threat level exceeds 400 W or board layout allows larger pad area and tighter thermal constraints apply. |
Compared with SMAJ110CA-E3/61, the unidirectional SMAJ110A-E3/61 requires careful polarity alignment and lacks AC-line suitability, while the SMBJ110CA-E3/52 trades compactness for enhanced surge margin and thermal headroom - making SMAJ110CA-E3/61 optimal for space-constrained, bidirectional, medium-energy protection tasks.
Availability
SMAJ110CA-E3/61 is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, telecom infrastructure interfaces, and consumer appliance motor control systems requiring stable component supply and RoHS-compliant sourcing.
Supply support for SMAJ110CA-E3/61 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, power efficiency, and automotive-grade qualification.
The SMAJ series targets cost-sensitive, high-volume transient suppression needs in automotive, industrial, and communications equipment - delivering standardized TVS performance in compact, automated-assembly-ready packages.
FAQ
What is the maximum clamping voltage of SMAJ110CA-E3/61 under a 10/1000 μs surge?
The SMAJ110CA-E3/61 exhibits a maximum clamping voltage (VC) of 177 V when subjected to its rated peak pulse current of 1.7 A using the standardized 10/1000 μs waveform. This value is measured per JEDEC JESD22-A114 and defines the upper voltage limit imposed on protected circuitry during transient events. The clamping performance remains consistent across its operating temperature range (−55 °C to +150 °C), making SMAJ110CA-E3/61 suitable for under-hood and industrial environments where thermal stability is critical.
Is SMAJ110CA-E3/61 suitable for protecting bidirectional communication lines like RS-485?
Yes, SMAJ110CA-E3/61 is explicitly designed for bidirectional applications, as indicated by the "CA" suffix and confirmed in Vishay's documentation stating "Electrical characteristics apply in both directions." Its symmetrical breakdown behavior allows placement across differential pairs (e.g., RS-485 A/B lines) without polarity concerns, and its 177 V clamping voltage ensures compliance with IEC 61000-4-5 surge immunity requirements for telecom interfaces. No additional biasing or external components are needed to enable bidirectional operation of SMAJ110CA-E3/61.
Does SMAJ110CA-E3/61 meet automotive qualification standards?
The base SMAJ110CA-E3/61 is RoHS-compliant and commercial-grade; however, Vishay offers AEC-Q101 qualified versions under the HE3 and HM3 suffixes (e.g., SMAJ110CAHE3_A). These variants undergo extended stress testing including temperature cycling, humidity bias HAST, and ESD per AEC-Q101 Rev D. While SMAJ110CA-E3/61 itself is not AEC-Q101 certified, its design foundation and qualification pathway make it a direct drop-in candidate for automotive designs transitioning to qualified parts - provided layout, thermal, and test plans align with automotive requirements.
What is the thermal resistance and how does it affect PCB layout for SMAJ110CA-E3/61?
SMAJ110CA-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on the minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes no internal layer copper or thermal vias. To maintain safe junction temperatures under repetitive surges, designers should avoid excessive trace length between SMAJ110CA-E3/61 and ground planes, consider adding thermal vias beneath pads, and verify derating curves in Figure 2 of the datasheet. Exceeding TJ(max) = 150 °C risks parametric shift and reduced surge endurance.
How does the leakage current of SMAJ110CA-E3/61 impact low-power sensor circuits?
SMAJ110CA-E3/61 specifies a maximum reverse leakage current (ID) of 1.0 μA at its full stand-off voltage of 110 V, measured at 25 °C. At lower voltages - such as 24 V or 48 V typical in sensor supply rails - leakage drops exponentially and remains well below 100 nA. This ultra-low standby current ensures negligible loading on precision voltage references, battery-backed real-time clocks, or high-impedance analog sensor outputs, preserving accuracy and extending operational life in always-on IoT and industrial monitoring nodes using SMAJ110CA-E3/61.
SMAJ110CA-E3/61 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):
- 110V
- Voltage - Breakdown (Min):
- 122V
- Voltage - Clamping (Max) @ Ipp:
- 177V
- Current - Peak Pulse (10/1000µs):
- 1.7A
- Power - Peak Pulse:
- 300W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ110CA-E3/61 FAQ
1.How can I place an order for SMAJ110CA-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ110CA-E3/61 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 SMAJ110CA-E3/61 reliable?
The price and inventory of SMAJ110CA-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ110CA-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ110CA-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ110CA-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ110CA-E3/61?
SMAJ110CA-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ110CA-E3/61 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 SMAJ110CA-E3/61?
For technical support, including SMAJ110CA-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ110CA-E3/61 requirements.
6.How does Aetrix verify that SMAJ110CA-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ110CA-E3/61 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 SMAJ110CA-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ110CA-E3/61?
All SMAJ110CA-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ110CA-E3/61, 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 SMAJ110CA-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ110CA-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ110CA-E3/61 Tags
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