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Texas Instruments ISO124U/1K
- Part No.:
- ISO124U/1K
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 28-SOIC (0.295", 7.50mm Width), 8 Leads
- Datasheet:
-
ISO124U/1K.pdf
- Description:
- IC OPAMP ISOLATION 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:346
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Product details
Overview
ISO124U/1K from Texas Instruments is a precision analog isolation amplifier with galvanic isolation via integrated 1-pF capacitive barrier, ±10-V input/output range, 50-kHz signal bandwidth, and 140-dB isolation mode rejection at 60 Hz - used in industrial transducer isolation, 4–20 mA loop interfaces, and ground-loop elimination circuits.
For engineers reviewing the ISO124U/1K datasheet, ISO124U/1K pinout, ISO124U/1K application, or ISO124U/1K equivalent, this page delivers verified specifications, SOIC-28 package details, functional role in high-voltage sensor conditioning, and validated alternative options for isolated analog signal transmission.
Technical Context
The ISO124U/1K implements duty-cycle modulation-demodulation across a differential capacitive barrier, converting analog input to digital pulse train for transmission, then reconstructing analog output with ripple filtering. Its dual-supply architecture separates high-side (±VS1/GND1) and low-side (±VS2/GND2) domains.
It features laser-trimmed circuitry for matched gain and offset between input and output sections, fixed unity gain (1 V/V), and no external components required for basic operation. The 500-kHz internal carrier enables 50-kHz small-signal bandwidth while maintaining <20 mVP-P output ripple.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 1500 VRMS continuous - certified for reinforced insulation in industrial safety-critical systems |
| Input Voltage Range | ±10 V - supports bipolar sensor outputs including thermocouples, RTDs, and bridge transducers |
| Signal Bandwidth | 50 kHz - preserves dynamic response for fast process control signals and motor feedback |
| Nonlinearity | ±0.010% FSR - ensures high-accuracy DC and low-frequency measurements in precision instrumentation |
| IMR @ 60 Hz | 140 dB - rejects common-mode noise from AC mains and variable-frequency drives |
| Supply Range | ±4.5 V to ±18 V per side - allows flexible power design with standard ±15-V rails or lower-voltage operation |
| Input Offset Drift | 200 µV/°C - limits thermal error drift in unregulated environments without active compensation |
Pinout & Package
ISO124U/1K is supplied in a 28-pin SOIC (DVA) package measuring 20.01 mm × 6.61 mm, with gull-wing leads and surface-mount compatibility. Pin functions are electrically isolated between high-side and low-side domains.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VS1 | High-side positive analog supply | Provides +V rail for input section; must be decoupled locally with 1-µF tantalum capacitor |
| –VS1 | High-side negative analog supply | Provides –V rail for input section; referenced to Gnd 1, not shared with output side |
| VIN | High-side analog input | Differential input referenced to Gnd 1; accepts ±10 V with 200-kΩ input resistance |
| –VS2 | Low-side negative analog supply | Provides –V rail for output section; referenced to Gnd 2, independent of high-side ground |
| +VS2 | Low-side positive analog supply | Provides +V rail for output section; powers VOUT stage and internal demodulator |
| VOUT | Low-side analog output | Unity-gain buffered output referenced to Gnd 2; drives ±10 V into ≥2-kΩ load |
| Gnd 1 | High-side ground reference | Return path for input section only; must be isolated from Gnd 2 by ≥1500 VRMS |
| Gnd 2 | Low-side ground reference | Return path for output section only; forms isolated domain with ±VS2 supplies |
Key Features
| Feature | Design Value |
|---|---|
| Digital barrier transmission | 500-kHz duty-cycle modulated signal across 1-pF capacitors - immune to barrier capacitance variation and EMI |
| Laser-trimmed matching | Input/output section trimming ensures <0.5% gain error and <50 mV initial offset - eliminates need for external calibration |
| Fixed unity gain | No external resistors required - simplifies layout and reduces component count in isolated analog channels |
| High dV/dt immunity | Withstands >1000 V/µs common-mode transients - suitable for motor drive and SCR-controlled environments |
| Low quiescent current | ±5.0 mA on VS1 and ±5.5 mA on VS2 - enables efficient operation in power-constrained isolated subsystems |
Applications
| Industrial Transducer Isolation | 4–20 mA Loop Isolation |
|---|---|
|
Use Scenario: Isolating thermocouple, RTD, or pressure bridge outputs in hazardous-area process controllers where ground potential differences exceed 1 V. IC Role / Device Role / Timing Role: Precision analog isolator converting high-side sensor voltage to low-side representation while blocking ground loops and CM noise. Use Value: Enables accurate measurement despite >1000-V isolation barrier and 140-dB IMR at 60 Hz - critical for SIL-2 compliant systems. |
Use Scenario: Breaking ground continuity in 4–20 mA current loops connecting field transmitters to PLC analog inputs in factory automation. IC Role / Device Role / Timing Role: High-fidelity voltage-to-voltage isolator interfacing loop-powered sensors to isolated ADC front-ends. Use Value: Maintains ±0.010% linearity over full temperature range - preserves mA-to-engineering-unit conversion accuracy. |
| Motor & SCR Control Feedback | PC-Based Data Acquisition |
|
Use Scenario: Monitoring phase current or bus voltage in IGBT/SCR-based motor drives where switching noise exceeds 1 kV/µs. IC Role / Device Role / Timing Role: Isolated analog interface capturing high-bandwidth (≤50 kHz) feedback signals across noisy power domains. Use Value: 50-kHz bandwidth and 2 V/µs slew rate support closed-loop current regulation without aliasing or delay-induced instability. |
Use Scenario: Adding isolated analog input channels to USB or PCIe DAQ cards for lab-grade measurement of grounded equipment. IC Role / Device Role / Timing Role: Safety-rated analog isolator enabling direct connection of DUTs with floating grounds to host PC. Use Value: 1500-VRMS isolation rating meets UL 61010-1 requirements for CAT II 300-V measurement categories. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AMC1301DWVR | Delta-sigma modulator output (digital bitstream), requires external ΣΔ filter; 7-kVPK isolation; 200-kHz bandwidth | Targets digital-domain isolation with MCU/FPGA post-processing; not pin-compatible or functionally drop-in | Select when system already includes digital filtering capability and higher bandwidth or reinforced isolation is required. |
| ISO122JP | PDIP-16 package; identical electrical specs but different footprint; 140-dB IMR, ±10-V range, 50-kHz BW | Used where through-hole assembly or legacy board compatibility is mandatory | Choose for manual prototyping or replacement in existing PDIP-based designs - same performance, different mechanical fit. |
Compared with ISO124U/1K, AMC1301DWVR shifts signal processing to the digital domain and raises isolation strength, while ISO122JP retains identical analog behavior in a through-hole package - neither offers pin-to-pin compatibility, but both serve overlapping precision isolation use cases.
Availability
ISO124U/1K is available at Aetrix Electronics and suitable for industrial process control, motor control feedback, and PC-based data acquisition requiring stable component supply and long-term lifecycle assurance.
Supply support for ISO124U/1K 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
Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and industrial-grade performance.
The ISO124 product line was designed specifically for high-accuracy analog signal isolation in harsh industrial environments - targeting transducer conditioning, ground-loop elimination, and safety-isolated measurement systems.
FAQ
What is the isolation voltage rating of the ISO124U/1K?
The ISO124U/1K is rated for 1500 VRMS continuous isolation voltage and 100% tested to 2400 VRMS at 60 Hz with ≤5 pC partial discharge. This rating applies across the internal capacitive barrier and complies with reinforced insulation requirements for industrial safety standards. The ISO124U/1K maintains this rating under full operating temperature range (–25°C to +85°C) and lifetime stress conditions.
Does the ISO124U/1K require external components for basic operation?
No, the ISO124U/1K operates with fixed unity gain and requires no external resistors or capacitors for core functionality. Only local 1-µF tantalum bypass capacitors on each supply pin (+VS1, –VS1, +VS2, –VS2) are mandatory for stability and noise suppression. All trimming, modulation, and demodulation circuitry is integrated - making the ISO124U/1K a true single-chip isolated amplifier solution.
What is the maximum signal bandwidth supported by the ISO124U/1K?
The ISO124U/1K provides a small-signal bandwidth of 50 kHz, defined as the –3-dB point for sinusoidal input. This bandwidth supports fast transient capture in motor control, power monitoring, and real-time process control. Input signals above 250 kHz exhibit aliasing due to the 500-kHz internal carrier frequency, so anti-aliasing filtering is recommended for wideband applications.
Can the ISO124U/1K operate from single-supply rails on either side?
The ISO124U/1K requires dual ± supplies on both high-side (±VS1) and low-side (±VS2) domains. However, single-supply operation is achievable using external circuitry: a Zener diode or charge pump can generate the negative rail on the high side, as documented in TI's "Single-Supply Operation of Isolation Amplifiers" application note. The ISO124U/1K itself does not support true single-supply configuration internally.
How does the ISO124U/1K handle common-mode transients?
The ISO124U/1K achieves high common-mode transient immunity via its digital modulation architecture and matched capacitive barrier. It withstands dV/dt up to 1000 V/µs without false triggering; beyond that, sense amplifier misfires may occur. Its 140-dB IMR at 60 Hz and >1014 Ω || 2 pF barrier impedance ensure minimal coupling of fast transients - critical in SCR/motor-drive environments where ISO124U/1K is routinely deployed.
ISO124U/1K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width), 8 Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Isolation
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 2V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 50 kHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 20 mV
- Current - Supply:
- 5mA
- Current - Output / Channel:
- 15 mA
- Voltage - Supply Span (Min):
- 9 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -25°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ISO124U/1K FAQ
1.How can I place an order for ISO124U/1K through Aetrix?
Please submit a Request for Quotation (RFQ) for ISO124U/1K 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 ISO124U/1K reliable?
The price and inventory of ISO124U/1K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISO124U/1K is usually 5 days.
3.What payment methods are accepted for ISO124U/1K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISO124U/1K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISO124U/1K?
ISO124U/1K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISO124U/1K 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 ISO124U/1K?
For technical support, including ISO124U/1K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISO124U/1K requirements.
6.How does Aetrix verify that ISO124U/1K is sourced from the original manufacturer or authorized distributors?
All ISO124U/1K 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 ISO124U/1K meets industry standards.
7.What is the process for return or replacement of ISO124U/1K?
All ISO124U/1K units undergo pre-shipment inspection (PSI). If there is an issue with ISO124U/1K, 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 ISO124U/1K part is unused and in its original packaging.
Return procedure for ISO124U/1K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISO124U/1K Tags
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