LDA111S IXYS SEMICONDUCTOR Integrated Circuit (Small Outline Packages) In Stock
IXYS LDA111S is a single-channel Darlington output optocoupler in a small outline package, providing high current transfer ratio and galvanic isolation between input and output circuits. Suitable for motor control, PLC interfaces, and signal isolation up to 5000 V.
- Manufacturer
- IXYS SEMICONDUCTOR
- Package
- Small Outline Packages
- Pin Count
- 6
- Lifecycle
- ACTIVE
- Datasheet
- LDA111S Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.5516(MOQ 1)
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of LDA111S?
- Darlington transistor output delivers high current transfer ratio (CTR) exceeding 300% for driving higher-load circuits
- Single-channel small outline package (SOP) enables compact PCB footprint with standard pick-and-place assembly
- Galvanic isolation between LED input and transistor output provides noise immunity and protects sensitive logic from high-voltage transients
What is LDA111S used for?
The LDA111S is used in industrial automation equipment such as PLCs, motor drives, and relay-replacement circuits where high current gain and isolation are required. Its Darlington output stage allows it to drive loads directly without additional buffer transistors, simplifying design in power supply feedback, gate-drive isolation, and TRIAC trigger circuits. The small outline package makes it suitable for space-constrained control boards in HVAC systems, smart meters, and robotics.
What are the specifications of LDA111S?
| Optoelectronic Device Type | DARLINGTON OUTPUT OPTOCOUPLER |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| HTS Code | 8541.40.80.00 |
Where can I find the LDA111S datasheet?
LDA111S Datasheet DownloadOfficial datasheet from IXYS SEMICONDUCTOR
What are equivalent replacements for LDA111S?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What output configuration does the LDA111S use and how does it affect drive capability?
The LDA111S uses a Darlington transistor output stage, which provides a current transfer ratio (CTR) exceeding 300% at 1 mA input current. This high gain allows the device to directly drive loads up to 150 mA without external buffer transistors, simplifying circuit design.
What isolation voltage does the LDA111S provide and what standards does it meet for industrial safety?
The LDA111S provides galvanic isolation of up to 5000 V RMS between the LED input and the Darlington output. This meets IEC 60747-5-5 reinforced insulation requirements for industrial equipment operating in 300 V AC environments, making it suitable for motor drives and power converters.
How does the LDA111S compare with a single-transistor optocoupler such as the 4N35 in high-gain applications?
Unlike the standard single-transistor 4N35 with CTR around 100% at 10 mA, the LDA111S Darlington configuration achieves CTR above 300% at just 1 mA input, reducing LED drive power by up to 10 times. The trade-off is a slower switching speed of approximately 50 µs versus 5 µs for the 4N35, making LDA111S better suited for DC switching than high-speed logic.
Related Guides
C0402C103K3RACTU Selection Guide: Choosing a 10 nF 0402 MLCC
Select C0402C103K3RACTU by voltage margin, X7R behavior, tolerance, 0402 assembly risk, and qualified alternatives.
Aug 4, 2026
STM32H753VIT6 MCU Selection Guide: Memory, Package, Connectivity, and Security
Choose STM32H753VIT6 by evaluating memory architecture, LQFP-100 pin fit, connectivity, security, power, and sourcing tradeoffs.
Aug 4, 2026
STM32H753VIT6 High-Performance MCU Design Guide
Practical STM32H753VIT6 design guidance for power, clocks, memory, DMA, PCB layout, bring-up, and production recovery.
Aug 3, 2026
STM32H753ZIT6 Selection Guide for High-Performance Embedded Systems
Select the STM32H753ZIT6 by evaluating compute, memory, LQFP144 pinout, power, interfaces, security, and sourcing requirements.
Aug 3, 2026
Why Buy from FindMyChip
About IXYS SEMICONDUCTOR
IXYS SEMICONDUCTOR is a leading electronic component manufacturer. FindMyChip sources IXYS SEMICONDUCTOR ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
More from IXYS SEMICONDUCTOR
CPC1025NTR
Small Outline Packages
Relay or Contactor
IXFH20N100P
Transistor Outline, Vertical
MOSFET (N-Channel)
CLA60MT1200NHB
Transistor Outline, Vertical
Integrated Circuit
IXDN609SI
Small Outline Packages
Integrated Circuit
IXTK120N65X2
Transistor Outline, Vertical
MOSFET (N-Channel)
IXTK102N65X2
Transistor Outline, Vertical
MOSFET (N-Channel)
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $1.1820 | $1.18 |
| 16+ | $0.7092 | $11.35 |
| 72+ | $0.5516 | $39.72 |
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“The anti-counterfeit verification gave us confidence we'd never had with other China suppliers.”
You May Also Like
ACS770ECB-200U-PFF-T
Allegro Microsystems
Integrated Circuit
ACS770KCB-150U-PFF-T
Allegro Microsystems
Integrated Circuit
MC33901WEF
NXP
Integrated Circuit
MC7808BDTRKG
ON Semiconductor
Integrated Circuit
PA94EC
Apex Microtechnology
Integrated Circuit
AP7315-28SR-7
Diodes Inc.
Integrated Circuit
74HCT245D
Nexperia
Integrated Circuit
CY62256VNLL-70ZXCT
Cypress Semiconductor
Integrated Circuit
EPM7032AETC44-4N
Intel
Integrated Circuit
EPM3512AQC208-10N
Intel
Integrated Circuit
EPM3256ATC144-7N
Intel
Integrated Circuit
EPM3256AQC208-7N
Intel
Integrated Circuit
EPM3256AQC208-10N
Intel
Integrated Circuit
EPM3128ATC100-7N
Intel
Integrated Circuit
EPM1270F256C4N
Intel
Integrated Circuit
EPF8282ATC100-4N
Intel
Integrated Circuit
EPF6016QC208-2N
Intel
Integrated Circuit
EPF6016ATC144-3N
Intel
Integrated Circuit
EPF10K30ATC144-3N
Intel
Integrated Circuit
EPC2TI32N
Intel
Integrated Circuit
EPC2LC20
Intel
Integrated Circuit
EP3SL150F1152C4N
Intel
Integrated Circuit
EP2SGX60DF780C5N
Intel
Integrated Circuit
EP2SGX60CF780C5N
Intel
Integrated Circuit