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Texas Instruments ISO124U/1KE4
- Part No.:
- ISO124U/1KE4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 28-SOIC (0.295", 7.50mm Width), 8 Leads
- Datasheet:
-
ISO124U/1KE4.pdf
- Description:
- 10-V INPUT, PRECISION VOLTAGE SE
- Quantity:
- Payment:
- Shipping:
Inventory:3,380
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Product details
Overview
ISO124U/1KE4 from Texas Instruments is a precision analog isolation amplifier with galvanic isolation via integrated 2-pF differential 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/1KE4 datasheet, ISO124U/1KE4 pinout, ISO124U/1KE4 application, or ISO124U/1KE4 equivalent, this page delivers verified pin functions, real-world isolation performance metrics, supply configuration requirements, and validated alternative options for high-reliability analog signal conditioning in safety-critical industrial systems.
Technical Context
The ISO124U/1KE4 implements duty-cycle modulation-demodulation across an on-package capacitive barrier, transmitting input signals digitally to eliminate barrier-dependent drift and ensure stable gain accuracy. Its modulator integrates VIN/200 kΩ against a switched ±100-µA current source, generating a 500-kHz carrier-modulated waveform.
The demodulator reconstructs the analog output using a feedback integrator with 200-kΩ resistor and sample-and-hold stages to suppress ripple. Input and output sections are laser-trimmed for matching, achieving 0.010% max nonlinearity and 200 µV/°C VOS drift without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 1500 Vrms continuous; 2400 Vrms 100% tested - enables safe operation in Class I, Division 2 hazardous locations and industrial mains-connected sensors. |
| Input/Output Range | ±10 V full-scale - supports bipolar sensor outputs (e.g., thermocouples, RTDs) without level-shifting circuitry. |
| Signal Bandwidth | 50 kHz - preserves dynamic response for motor control feedback, power monitoring, and fast-loop instrumentation. |
| Nonlinearity | 0.010% FSR maximum - ensures <1 mV error over ±10 V span, critical for precision process control calibration. |
| IMR @ 60 Hz | 140 dB - rejects ground potential differences up to 100 V at line frequency, eliminating measurement corruption in noisy plants. |
| Supply Range | ±4.5 V to ±18 V per side - allows flexible dual-rail design with standard ±15 V supplies or low-voltage ±5 V systems. |
| VOS Drift | 200 µV/°C - limits temperature-induced offset shift to <17 mV over –25°C to +85°C operating range. |
Pinout & Package
ISO124U/1KE4 is packaged in a 16-pin plastic DIP (PDIP-16) with body size 17.90 mm × 7.50 mm. The package integrates two matched 1-pF isolation capacitors embedded in the plastic body between input and output die sections.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VS1 | High-side positive analog supply | Provides power to input section; must be decoupled with 1-µF tantalum capacitor near pin 1. |
| –VS1 | High-side negative analog supply | Completes high-side bipolar rail; referenced to Gnd 1, not system ground. |
| 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 | Completes low-side bipolar rail; referenced to Gnd 2, isolated from Gnd 1. |
| +VS2 | Low-side positive analog supply | Provides power to output section; decoupling required at pin 9. |
| Gnd 2 | Low-side ground reference | Return path for VOUT and low-side supplies; electrically isolated from Gnd 1 by >10¹⁴ Ω || 2 pF barrier. |
| VOUT | Low-side analog output | Unity-gain buffered output delivering ±10 V; drives up to ±15 mA into 2-kΩ load. |
| Gnd 1 | High-side ground reference | Return path for VIN and high-side supplies; forms isolation boundary with Gnd 2. |
Key Features
| Feature | Design Value |
|---|---|
| 100% high-voltage breakdown test | Every unit subjected to 2400 Vrms, 60-Hz stress with ≤5-pC partial discharge - guarantees barrier integrity for life-critical isolation. |
| Fixed unity-gain configuration | No external resistors or compensation needed - reduces BOM count and layout sensitivity in field-deployed equipment. |
| Digital modulation architecture | 500-kHz duty-cycle modulation eliminates analog barrier dependency - ensures stable gain and linearity across temperature and lifetime. |
| Bipolar ±10-V operation | Supports direct connection to industrial sensors without external level-shifting or biasing networks. |
| 200-µV/°C VOS drift | Minimizes calibration drift in unattended systems; enables 8-hour stability testing without recalibration. |
Applications
| Transducer Isolation | 4–20 mA Loop Isolation |
|---|---|
|
Use Scenario: Isolating millivolt-level outputs from thermocouples, RTDs, or strain gauges in refinery process skids where ground potentials differ by >50 V. IC Role / Device Role / Timing Role: Precision analog isolator converting high-side sensor voltage to low-side ±10 V output while blocking common-mode noise and ground loops. Use Value: Enables accurate temperature/pressure readings despite 140 dB IMR at 60 Hz - eliminating spurious trips in safety instrumented systems (SIS). |
Use Scenario: Breaking ground continuity between field transmitter and DCS cabinet in chemical plant automation, preventing current loop corruption. IC Role / Device Role / Timing Role: Galvanically isolates 4–20 mA loop signals by converting current-derived voltage to isolated analog output for PLC analog inputs. Use Value: Maintains 0.010% nonlinearity across full 16 mA span - preserving 12-bit+ resolution in distributed control systems. |
| Motor & SCR Control Feedback | PC-Based Data Acquisition |
|
Use Scenario: Monitoring phase current or DC bus voltage in variable-frequency drives where switching transients exceed 1 kV/µs. IC Role / Device Role / Timing Role: High-speed isolation amplifier capturing motor current waveforms with 50-kHz bandwidth and 2 V/µs slew rate. Use Value: Withstands >1000 V/µs dV/dt without false triggering - ensuring clean feedback for closed-loop torque control during IGBT commutation. |
Use Scenario: Adding isolated analog input channels to USB or PCIe DAQ cards for lab-grade measurements of mains-referenced sources. IC Role / Device Role / Timing Role: Provides certified 1500 Vrms isolation between user PC and high-voltage test fixtures or power electronics prototypes. Use Value: Eliminates risk of PC damage from accidental probe shorts while maintaining <1 LSB error in 16-bit acquisition systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision isolation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISO122JP | SOIC-28 package; 100-kHz bandwidth; 0.005% nonlinearity; ±18-V supply max | Higher bandwidth and lower nonlinearity, but requires PCB redesign due to 28-pin footprint and different pinout | Select when 100-kHz response or sub-0.005% linearity is required; verify thermal derating for SOIC-28 in convection-cooled enclosures |
| AMC1301DWVR | Reinforced isolation (7000 Vpk); 20-bit resolution; 20-MHz internal clock; current-input (±250-mA) instead of voltage-input | Designed for shunt-based current sensing; requires external precision shunt and op-amp for voltage-to-current conversion | Choose for high-accuracy motor phase current monitoring; avoid if existing design uses voltage-output sensors or lacks shunt layout space |
Compared with ISO124U/1KE4, ISO122JP offers higher bandwidth and tighter linearity in surface-mount form but demands layout changes, while AMC1301DWVR provides reinforced isolation and digital-ready output but shifts signal chain topology from voltage-input to current-input architecture.
Availability
ISO124U/1KE4 is available at Aetrix Electronics and suitable for industrial process control, motor drive feedback, and PC-based data acquisition requiring stable component supply across extended product lifecycles.
Supply support for ISO124U/1KE4 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 specializing in analog and embedded processing technologies, with decades of experience in high-reliability isolation solutions for industrial and automotive markets.
The ISO124 series was designed specifically for precision analog signal isolation in harsh industrial environments - emphasizing long-term stability, certified high-voltage endurance, and minimal external component count for field-deployable instrumentation.
FAQ
What is the isolation voltage rating of the ISO124U/1KE4?
The ISO124U/1KE4 has a continuous isolation voltage rating of 1500 Vrms at 60 Hz, with 100% production testing at 2400 Vrms for 1 second and ≤5-pC partial discharge. This meets UL 1577 and IEC 60747-5-2 standards for reinforced insulation in industrial equipment, enabling safe interface between mains-referenced sensors and low-voltage control systems.
Does the ISO124U/1KE4 require external components for basic operation?
No, the ISO124U/1KE4 operates in fixed unity-gain configuration with no external resistors or capacitors required for core functionality. Only 1-µF tantalum bypass capacitors on each supply pin (+VS1, –VS1, +VS2, –VS2) are mandatory per TI's layout guidelines. All trimming, modulation, and demodulation circuitry is fully integrated within the ISO124U/1KE4 die and package.
Can the ISO124U/1KE4 operate from single-supply rails on either side?
The ISO124U/1KE4 requires dual-supply operation on both high-side (±VS1) and low-side (±VS2) - it does not support true single-supply operation. However, TI provides application circuits using Zener diodes or charge pumps (e.g., Figure 21 in SBOS074E) to derive the negative rail from a single positive supply on the high-voltage side, maintaining ±10-V input/output compliance.
What is the maximum signal frequency the ISO124U/1KE4 can accurately reproduce?
The ISO124U/1KE4 has a small-signal bandwidth of 50 kHz, meaning it maintains ≤3-dB gain flatness up to that frequency. Input signals above 250 kHz exhibit aliasing due to its 500-kHz carrier-based modulation architecture - so for faithful reproduction, signals must remain below 50 kHz; anti-alias filtering is recommended for broadband inputs.
How does the ISO124U/1KE4 handle high dV/dt transients across the isolation barrier?
The ISO124U/1KE4 tolerates dV/dt up to ~1000 V/µs before sense amplifier false triggering occurs. Above this threshold, spurious output errors may appear. Reducing supply voltages below ±15 V lowers effective dV/dt, improving immunity. Its digital modulation architecture inherently provides superior transient immunity compared to optocoupler-based isolators, especially against fast EFT bursts.
ISO124U/1KE4 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:
- Single-Ended
- Slew Rate:
- 2V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 50 kHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 20 mV
- Current - Supply:
- 5.5mA
- Current - Output / Channel:
- 15 mA
- Voltage - Supply Span (Min):
- 9 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -25°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ISO124U/1KE4 FAQ
1.How can I place an order for ISO124U/1KE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ISO124U/1KE4 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/1KE4 reliable?
The price and inventory of ISO124U/1KE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISO124U/1KE4 is usually 5 days.
3.What payment methods are accepted for ISO124U/1KE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISO124U/1KE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISO124U/1KE4?
ISO124U/1KE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISO124U/1KE4 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/1KE4?
For technical support, including ISO124U/1KE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISO124U/1KE4 requirements.
6.How does Aetrix verify that ISO124U/1KE4 is sourced from the original manufacturer or authorized distributors?
All ISO124U/1KE4 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/1KE4 meets industry standards.
7.What is the process for return or replacement of ISO124U/1KE4?
All ISO124U/1KE4 units undergo pre-shipment inspection (PSI). If there is an issue with ISO124U/1KE4, 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/1KE4 part is unused and in its original packaging.
Return procedure for ISO124U/1KE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISO124U/1KE4 Tags
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LM358DT
STMicroelectronics
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LM358DR
Texas Instruments
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LM2904DR
Texas Instruments
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LM358ADR
Texas Instruments
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LM2904DGKR
Texas Instruments
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LM324DR
Texas Instruments
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MCP6006T-E/OT
Microchip Technology
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MCP6006UT-E/OT
Microchip Technology
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LM324PWR
Texas Instruments
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LM2902PWR
Texas Instruments
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LM2902DR
Texas Instruments
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LM358P
Texas Instruments
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