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Vishay General Semiconductor - Diodes Division SMAJ110A-E3/5A
- Part No.:
- SMAJ110A-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ110A-E3/5A.pdf
- Description:
- TVS DIODE 110VWM 177VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,090
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Product details
Overview
SMAJ110A-E3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. It features a 110 V stand-off voltage (VWM), 122–135 V breakdown voltage (VBR) at 1 mA test current, 177 V maximum clamping voltage (VC) at 1.7 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 μs waveform.
For engineers reviewing the SMAJ110A-E3/5A datasheet, SMAJ110A-E3/5A pinout, SMAJ110A-E3/5A application, or SMAJ110A-E3/5A equivalent, key selection criteria include clamping performance under 1.7 A surge, thermal resistance (RθJA = 120 °C/W), unidirectional polarity marking, RoHS-compliant matte tin plating, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR (122–135 V), it avalanches to divert transient energy away from downstream circuitry. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at VWM).
The device is rated for non-repetitive 10/1000 μs surges up to 400 W (derated to 300 W above 78 V), with fast response time (<1.0 ns) and low incremental surge resistance - critical for protecting MOSFET gates, IC power rails, and sensor signal lines in automotive and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 110 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working margin. |
| VBR (min/max) | 122 V / 135 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during transients. |
| VC @ IPPM | 177 V at 1.7 A - Clamped voltage seen by protected circuit during full-rated surge; determines residual stress on downstream components. |
| PPPM | 400 W (10/1000 μs) - Peak transient energy handling capacity; derates to 300 W above 78 V per datasheet fig. 2. |
| ID @ VWM | ≤1.0 μA - Reverse leakage at stand-off voltage; low value minimizes standby power loss and avoids false triggering. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; dictates power derating above 25 °C ambient. |
| Polarity | Unidirectional - Cathode marked by band; blocks forward conduction, clamps only in reverse overvoltage events. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity indicated by cathode band on unidirectional types.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to system ground or lower-potential rail; completes clamping loop during reverse overvoltage. |
| Cathode | Protected line connection / transient sink | Connected to line being protected (e.g., 110 V supply rail); avalanche conduction occurs from cathode to anode when V > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV line-to-earth) on 110 V systems without derating. |
| Glass passivated chip junction | Ensures stable VBR tolerance (±5%), low leakage (<1 μA), and long-term reliability under thermal cycling. |
| MSL Level 1 (J-STD-020), 260 °C peak reflow | Supports lead-free reflow assembly without moisture-induced popcorning; no pre-bake required. |
| RoHS-compliant, matte tin plating | Guarantees solderability and intermetallic formation control per J-STD-002; eliminates lead-based contamination risk. |
| Low profile SMA package | 0.208" × 0.157" footprint enables high-density PCB layout while maintaining 120 °C/W thermal resistance on minimal copper area. |
Applications
| Industrial Motor Drive Power Supply | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Protecting 110 V DC bus rails in servo amplifier power stages from inductive kickback during IGBT switching. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed across input capacitor to clamp flyback spikes before they reach DC-DC converters. Use Value: Limits transient overshoot to ≤177 V, preventing overvoltage damage to 200 V-rated electrolytic capacitors and gate drivers. |
Use Scenario: Safeguarding LIN bus transceivers and microcontroller I/O pins against load dump and jump-start surges in BCM modules. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V supply line upstream of LDO regulators, triggered only during >122 V events. Use Value: Maintains <1.0 μA leakage at 12 V nominal, avoiding regulator quiescent current degradation while clamping 177 V peaks. |
| Telecom AC/DC Front-End Rectifier | Industrial Sensor Signal Conditioning |
|
Use Scenario: Clamping rectified 110 V AC line surges before bulk capacitor and PFC controller in telecom power supplies. IC Role / Device Role / Timing Role: Primary-level transient suppressor mounted directly at bridge rectifier output, absorbing 10/1000 μs line surges. Use Value: Withstands 400 W pulses without degradation, enabling compliance with EN 61000-4-5 (4 kV) without series impedance. |
Use Scenario: Protecting analog front-end inputs of 4–20 mA current-loop sensors exposed to field wiring transients in factory automation. IC Role / Device Role / Timing Role: Low-leakage TVS on sensor output line, placed after current-limiting resistor to avoid loading error. Use Value: 1.0 μA max leakage at 110 V standoff preserves <0.01% full-scale accuracy in precision current measurement circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ110A-M3/5A | Halogen-free, RoHS-compliant variant; identical electrical specs and package. | No functional difference; selected where halogen-free material compliance is mandated (e.g., EU public infrastructure projects). | Direct substitution if halogen-free certification is required; same thermal and clamping performance. |
| SMCJ110A-E3/57T | Higher-power SMC (DO-214AB) package: 1500 W PPPM, RθJA = 35 °C/W, same VWM/VBR/VC ratings. | Used where higher surge repetition rate or sustained power dissipation is needed; requires larger PCB footprint. | Choose when system-level surge testing exceeds 400 W single-event limits or thermal management demands lower RθJA. |
Compared with SMAJ110A-E3/5A, the M3 variant offers identical protection performance with halogen-free construction, while the SMCJ110A-E3/57T provides 3.75× higher pulse power in a larger package - enabling extended surge endurance or improved thermal headroom in high-temperature enclosures.
Availability
SMAJ110A-E3/5A is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom power supplies, and sensor interface circuits requiring stable component supply with full RoHS compliance and automated placement support.
Supply support for SMAJ110A-E3/5A 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, efficiency, and application-specific optimization.
The SMAJ series is engineered for surface-mount transient suppression in space-constrained, high-reliability applications - delivering precise clamping, low leakage, and AEC-Q101 qualification options for automotive and industrial use.
FAQ
What is the maximum clamping voltage of the SMAJ110A-E3/5A under rated surge conditions?
The SMAJ110A-E3/5A exhibits a maximum clamping voltage (VC) of 177 V when subjected to its rated peak pulse current (IPPM) of 1.7 A using the 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 standards and represents the highest voltage imposed on the protected circuit during full-surge event - critical for ensuring downstream components remain within their absolute maximum ratings.
Does the SMAJ110A-E3/5A meet automotive qualification standards?
The base SMAJ110A-E3/5A is commercial-grade and RoHS-compliant but not AEC-Q101 qualified. However, Vishay offers the automotive variant SMAJ110AHE3_A/I (with HE3 suffix), which carries full AEC-Q101 qualification for temperature cycling, humidity, and surge robustness - essential for under-hood and chassis-mounted applications where the SMAJ110A-E3/5A alone would not be approved.
How does the thermal resistance of the SMAJ110A-E3/5A affect its power derating?
The SMAJ110A-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W on standard 0.2" × 0.2" copper pads. At 75 °C ambient, its power dissipation must be derated from 3.3 W (at 50 °C) to approximately 1.9 W to maintain TJ ≤ 150 °C - directly impacting sustained surge repetition rate and long-term reliability in enclosed industrial enclosures.
Can the SMAJ110A-E3/5A be used in bidirectional protection circuits?
No - the SMAJ110A-E3/5A is strictly unidirectional, indicated by the "A" suffix and cathode band marking. For bidirectional operation, the SMAJ110CA variant must be used, which provides symmetrical clamping in both polarities and omits the polarity band. Substituting SMAJ110A-E3/5A in a bidirectional design risks forward conduction and failure during negative transients.
What is the reverse leakage current specification for the SMAJ110A-E3/5A at its stand-off voltage?
The SMAJ110A-E3/5A specifies a maximum reverse leakage current (ID) of 1.0 μA at its 110 V stand-off voltage (VWM), measured at 25 °C. This ultra-low leakage ensures minimal power loss in always-on 110 V monitoring circuits and prevents false triggering or bias shift in high-impedance sensor interfaces where even nanoamp-level currents impact accuracy.
SMAJ110A-E3/5A 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ110A-E3/5A FAQ
1.How can I place an order for SMAJ110A-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ110A-E3/5A 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 SMAJ110A-E3/5A reliable?
The price and inventory of SMAJ110A-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ110A-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ110A-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ110A-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ110A-E3/5A?
SMAJ110A-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ110A-E3/5A 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 SMAJ110A-E3/5A?
For technical support, including SMAJ110A-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ110A-E3/5A requirements.
6.How does Aetrix verify that SMAJ110A-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ110A-E3/5A 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 SMAJ110A-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ110A-E3/5A?
All SMAJ110A-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ110A-E3/5A, 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 SMAJ110A-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ110A-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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