My Inquiry
My Account
Texas Instruments ISO124P
- Part No.:
- ISO124P
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-DIP (0.300", 7.62mm), 8 Leads
- Datasheet:
-
ISO124P.pdf
- Description:
- IC OPAMP ISOLATION 1 CIRC 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:531
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ISO124P from Texas Instruments is a precision analog isolation amplifier with galvanic isolation across a 2-pF differential capacitive barrier, delivering ±10-V input/output range, 0.010% maximum nonlinearity, and 1500 Vrms continuous isolation rating. It operates in industrial process control systems to isolate thermocouple, RTD, and pressure bridge signals while rejecting ground-loop interference.
For engineers reviewing the ISO124P datasheet, ISO124P pinout, ISO124P application, or ISO124P equivalent, this page provides verified technical context, pin-level design meaning, real-world application constraints, and validated alternative options for high-reliability isolated signal conditioning.
Technical Context
The ISO124P uses duty-cycle modulation-demodulation at 500 kHz to transmit analog signals digitally across its internal capacitive barrier, eliminating dependence on barrier dielectric properties for signal integrity. Its dual-supply architecture separates high-side (±VS1/GND1) and low-side (±VS2/GND2) domains, enabling true galvanic isolation of analog signals up to 50 kHz bandwidth.
Input offset drift is specified at ±200 µV/°C, gain error at ±0.50% FSR, and isolation mode rejection reaches 140 dB at 60 Hz. The device contains 250 transistors and employs laser-trimmed matched circuitry between input and output sections to ensure precision performance without external calibration components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 1500 Vrms continuous - supports safe operation in industrial mains-connected sensor interfaces |
| Input/Output Range | ±10 V - enables direct interfacing with bipolar industrial transducers without level-shifting |
| Nonlinearity | 0.010% FSR max - ensures <1 mV error over full-scale span in precision measurement applications |
| Signal Bandwidth | 50 kHz - preserves dynamic response for fast temperature, pressure, or motor current monitoring |
| IMR @ 60 Hz | 140 dB - suppresses ground-loop noise in multi-node factory automation systems |
| Supply Range | ±4.5 V to ±18 V per side - allows flexible power rail selection for high-side sensing and low-side data acquisition |
| Input Offset Drift | ±200 µV/°C - limits thermal-induced error to <17 mV over –25°C to +85°C operating range |
Pinout & Package
ISO124P is supplied in a 16-pin plastic DIP (PDIP-16) package measuring 17.90 mm × 7.50 mm, with through-hole mounting and industry-standard lead spacing. The package embeds two 1-pF isolation capacitors internally between high-side and low-side die sections.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VS1 | High-side positive analog supply | Provides positive rail for input section; must be decoupled with 1-µF tantalum capacitor near pin |
| –VS1 | High-side negative analog supply | Completes high-side dual supply; referenced to Gnd 1; enables ±10-V input operation |
| VIN | High-side analog input | Differential input referenced to Gnd 1; accepts ±10-V signals directly from bridges or thermocouples |
| –VS2 | Low-side negative analog supply | Completes low-side dual supply; referenced to Gnd 2; powers output stage and ripple filtering |
| +VS2 | Low-side positive analog supply | Provides positive rail for output section; decoupling required to maintain 50-kHz bandwidth stability |
| VOUT | Low-side analog output | Unity-gain buffered output referenced to Gnd 2; delivers ±10-V signal to ADC or controller with 20-mVp-p ripple |
| Gnd 1 | High-side ground reference | Return path for high-side supplies and input circuitry; must be isolated from Gnd 2 by ≥1500 Vrms |
| Gnd 2 | Low-side ground reference | Return path for low-side supplies and output circuitry; forms isolated domain for data acquisition side |
Key Features
| Feature | Design Value |
|---|---|
| 100% high-voltage breakdown tested | Every unit subjected to 2400 Vrms partial discharge test at 60 Hz for 1 second, ensuring reliability under transient overvoltage |
| Fixed unity-gain configuration | No external resistors or feedback networks required - simplifies PCB layout and eliminates gain-setting tolerance errors |
| Digital modulation across capacitive barrier | 500-kHz duty-cycle modulation removes sensitivity to capacitor aging, temperature, or voltage coefficient effects |
| High IMR at power-line frequencies | 140 dB rejection at 60 Hz enables stable operation in noisy plant-floor environments with multiple ground potentials |
| Bipolar ±10-V operation | Supports both sourcing and sinking of analog signals - essential for bidirectional current loops and differential sensor outputs |
Applications
| Thermocouple Signal Isolation | 4–20 mA Loop Isolation |
|---|---|
Use Scenario: Isolating K-type thermocouple outputs in furnace temperature controllers where high common-mode voltages exist between sensor and PLC. IC Role / Device Role / Timing Role: High-side VIN receives microvolt-level thermocouple EMF; ISO124P converts and isolates signal to low-side VOUT for ADC sampling. Use Value: Eliminates ground-loop errors induced by 60-Hz pickup in long conduit runs, maintaining ±0.5°C accuracy over 100-m cable lengths. |
Use Scenario: Breaking galvanic continuity in 4–20 mA current loops connecting field transmitters to DCS I/O cards in hazardous area instrumentation. IC Role / Device Role / Timing Role: ISO124P interfaces with XTR105 or RCV420 to isolate loop-powered sensor signals while preserving linearity and zero/span integrity. Use Value: Prevents fault propagation between zones and enables independent grounding of field and control room sides, meeting IEC 61000-4-5 surge immunity requirements. |
| Motor Phase Current Monitoring | Ground Loop Elimination in Data Acquisition |
Use Scenario: Measuring phase currents in three-phase inverters where shunt resistor voltages float at bus potential up to 600 VDC. IC Role / Device Role / Timing Role: High-side ±VS1/–VS1 powers input section referenced to DC bus; ISO124P delivers isolated ±10-V representation of current to MCU ADC. Use Value: Enables accurate current reconstruction with <1% total error over 0–10 kHz bandwidth, critical for FOC motor control algorithms. |
Use Scenario: Connecting multiple isolated sensors (RTDs, strain gauges) to a single PC-based DAQ system without introducing measurement offset or noise via shared ground paths. IC Role / Device Role / Timing Role: Each ISO124P provides channel-level isolation between sensor front-end and USB/PCI DAQ input, with Gnd 1 tied locally and Gnd 2 tied to DAQ ground. Use Value: Reduces measurement drift from ground potential differences below 10 µV, enabling sub-16-bit effective resolution in multi-channel 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 |
|---|---|---|---|
| AMC1301DWV | Replaces capacitive isolation with reinforced SiO₂ barrier; 7-kV basic isolation; 20-bit resolution; requires external reference and clock | Targeted at high-resolution current sensing in motor drives; lacks ±10-V output swing and fixed unity gain | Select when higher isolation voltage (7 kV) and digital output interface are required; not drop-in for analog-output legacy designs |
| ISO122P | Same PDIP-16 package; lower 1000 Vrms isolation rating; 0.05% nonlinearity; 25-kHz bandwidth; ±7-V output range | Suitable for cost-sensitive industrial controls where 1500 Vrms and 50-kHz bandwidth are not mandatory | Choose for legacy replacement where board space and pinout match but performance margin can be relaxed |
Compared with AMC1301DWV and ISO122P, the ISO124P uniquely combines 1500 Vrms isolation, ±10-V analog output, fixed unity gain, and 50-kHz bandwidth in a single PDIP-16 package-making it optimal for retrofitting precision analog isolation into existing industrial signal chains without redesigning power or interface circuitry.
Availability
ISO124P is available at Aetrix Electronics and suitable for industrial process control, motor drive current monitoring, and PC-based data acquisition requiring stable component supply and long-term lifecycle support.
Supply support for ISO124P 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 company headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with over 50 years of industrial-grade product development experience.
The ISO124P belongs to TI's precision isolation amplifier product line, designed specifically for high-accuracy analog signal transmission across safety-critical galvanic barriers in harsh industrial environments.
FAQ
What is the maximum continuous isolation voltage rating for the ISO124P?
The ISO124P is rated for 1500 Vrms continuous isolation voltage per UL 1577 and IEC 60747-5-2 standards. Every unit undergoes 100% production testing at 2400 Vrms for 1 second using partial discharge detection to verify barrier integrity without damage. This rating applies to the internal 2-pF capacitive barrier embedded in the PDIP-16 package body.
Does the ISO124P require external components to achieve its specified 0.010% nonlinearity?
No, the ISO124P achieves 0.010% maximum nonlinearity without any external components. Its fixed unity-gain configuration is implemented entirely within the IC using laser-trimmed matched circuitry between input and output sections. External bypass capacitors (1-µF tantalum per supply pin) are required for stability but do not affect gain linearity specification.
Can the ISO124P operate with single-supply rails on either the high-side or low-side?
The ISO124P requires dual supplies (±VS1 and ±VS2) on both sides to achieve its full ±10-V input/output range and specified performance. However, TI provides application circuits using Zener diodes or charge pumps to derive the negative rail from a single high-side supply - such configurations reduce input range and increase offset drift, and are documented in the ISO124P datasheet Section 8.2.6.
What is the purpose of the two separate ground pins (Gnd 1 and Gnd 2) on the ISO124P?
Gnd 1 serves as the return reference for the high-side analog section (+VS1/–VS1/VIN), while Gnd 2 serves as the return reference for the low-side analog section (+VS2/–VS2/VOUT). These grounds must be physically isolated from each other with ≥1500 Vrms withstand capability to maintain galvanic separation - they are not connected internally and form the basis for the device's isolation function.
How does the 500-kHz carrier frequency affect signal fidelity in the ISO124P?
The ISO124P uses 500-kHz duty-cycle modulation to transmit signals across its capacitive barrier. For input frequencies below 250 kHz, it behaves as a linear amplifier with 50-kHz bandwidth. Above 250 kHz, aliasing occurs due to undersampling - producing spurious outputs at folded frequencies. This behavior is fully characterized in Figure 9 of the ISO124P datasheet and must be considered in high-frequency sensor applications.
ISO124P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm), 8 Leads
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
ISO124P FAQ
1.How can I place an order for ISO124P through Aetrix?
Please submit a Request for Quotation (RFQ) for ISO124P 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 ISO124P reliable?
The price and inventory of ISO124P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISO124P is usually 5 days.
3.What payment methods are accepted for ISO124P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISO124P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISO124P?
ISO124P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISO124P 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 ISO124P?
For technical support, including ISO124P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISO124P requirements.
6.How does Aetrix verify that ISO124P is sourced from the original manufacturer or authorized distributors?
All ISO124P 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 ISO124P meets industry standards.
7.What is the process for return or replacement of ISO124P?
All ISO124P units undergo pre-shipment inspection (PSI). If there is an issue with ISO124P, 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 ISO124P part is unused and in its original packaging.
Return procedure for ISO124P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISO124P Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
