ISO122JP - Precision 50 kHz Isolation Amplifier | TI
MPN: ISO122JP ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $32.9459 | $32.95 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
ISO122JP Overview
An isolation amplifier is a precision analog signal-conditioning component that transfers a voltage signal across a galvanic isolation barrier while electrically separating input-side and output-side circuits. In the signal-chain hierarchy, the ISO122 belongs to the isolation-amplifier family, instrument-amplifier class, analog front end, and broader semiconductor category. Its built-in matched capacitive barrier supports high-voltage isolation and reduces the need for external isolation-network design.
The ISO122 uses duty-cycle modulation and demodulation to transmit the input signal across a differential capacitive barrier. Key verified specifications include 1500 Vrms high-voltage breakdown rating, 50 kHz bandwidth, 0.020% maximum nonlinearity, and 200 V/°C input-offset-voltage drift. Its power-supply range is 4.5 V to 18 V, while stated quiescent currents are 5 mA on VS1 and ±5.5 mA on VS2.
The device is intended for precision analog measurement and signal conditioning where isolated sensing improves safety or reduces ground-loop effects. The fixed unity-gain architecture simplifies implementation, and the manufacturer states that no external components are required for basic operation. The available package options include plastic DIP and surface-mount configurations, with ISO122JP identified by distributors as an 8-PDIP device.
Typical uses include isolated current measurement, industrial sensor interfaces, medical monitoring, power-conversion feedback, and laboratory instrumentation. The 50 kHz bandwidth supports signals above very-low-frequency sensing but is not intended for high-speed data acquisition. The main design consideration is ensuring the isolation barrier, creepage, clearance, supply bypassing, and input/output grounding meet the safety requirements of the target installation.
This page combines verified manufacturer specifications, distributor product information, and cross-reference findings. Cross-reference results identify related ISO124 devices, but the supplied evidence does not establish a verified pin-to-pin drop-in replacement for ISO122JP; alternatives are therefore limited and clearly qualified.
Drop-in alternatives for ISO122JP — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ISO122JP (same form factor and footprint) — differing in Package, Input Offset Voltage Drift, Gain Configuration, Mounting Type, Maximum Nonlinearity.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ISO122P
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
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View Datasheet →ISO122U
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
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View Datasheet →ISO124P
✅ Drop-In✓ In Stock
$8.75 / Unit
View Datasheet →ISO124U
✅ Drop-In✓ In Stock
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View Datasheet →ISO124UE4
✅ Drop-In📋 Reference alternative (not in catalog)
ISO122JP Maximum Ratings & Electrical Characteristics
| Product Type | Precision isolation amplifier |
| Maximum Nonlinearity | 0.020% |
| Signal Bandwidth | 50 kHz |
| Input Offset Voltage Drift | 200 V/°C |
| Power Supply Range | 4.5 V to 18 V |
| Bipolar Operation | ±10 V |
| VS1 Quiescent Current | 5 mA |
| VS2 Quiescent Current | ±5.5 mA |
| High-Voltage Breakdown Rating | 1500 Vrms |
| Isolation Barrier | Matched differential capacitive barrier; manufacturer sources state 2 pF in the product description |
| Gain Configuration | Fixed unity gain |
| External Components Required | None required for operation |
| Input and Output Isolation | Galvanic isolation between input and output sections |
| Package | 8-PDIP |
| Mounting Type | Through-hole |
| Signal Transmission Method | Duty-cycle modulation and demodulation across the capacitive barrier |
| Manufacturer Product Availability | Available in 16-pin plastic DIP and 28-lead plastic surface-mount package families |
ISO122JP 8-pdip Pin Configuration Guide
Pin configuration for ISO122JP (8-pdip package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for ISO122JP.
Refer to the datasheet for full pin configuration.
Typical Applications
ISO122JP is suitable for 6 applications: Industrial Sensor Signal Conditioning, Isolated Power Conversion Feedback, Medical Monitoring Signal Isolation, Laboratory Instrumentation, Current and Voltage Monitoring, Process-Control Interfaces.
Industrial Sensor Signal Conditioning
ISO122JP fits isolated industrial sensor interfaces when the measured signal is within the device's 50 kHz bandwidth and the design needs a fixed unity-gain signal path. The verified 0.020% maximum nonlinearity helps preserve measurement fidelity, while the isolation barrier separates the sensor-side circuitry from the system ground. Place the device between the protected input and downstream instrumentation, and verify common-mode limits, isolation spacing, and supply bypassing against the TI datasheet.
Recommended
Isolated Power Conversion Feedback
ISO122JP can condition feedback or monitoring voltages in isolated power-conversion systems where the feedback domain must remain separated from the controller ground. Its 4.5 V to 18 V supply range and 50 kHz bandwidth provide a useful operating envelope for slower control and monitoring signals. The fixed unity-gain configuration simplifies implementation, but the design must account for isolation capacitance, PCB creepage and clearance, and the specific safety standard required by the end product.
Recommended
Medical Monitoring Signal Isolation
ISO122JP is applicable to medical monitoring signal paths when the circuit design meets the applicable isolation, leakage, creepage, clearance, and safety requirements. The precision isolation-amplifier function helps prevent patient-side and host-side circuits from sharing an unintended conductive path, while the 50 kHz bandwidth covers many low-frequency physiological monitoring signals. It is not automatically a medical-certified solution; qualification, protection, electrode design, and compliance testing remain system-level responsibilities.
Recommended
Laboratory Instrumentation
ISO122JP is useful for isolated laboratory front ends measuring low-frequency sensor or process signals, especially where ground-loop reduction is important. Its stated 0.020% maximum nonlinearity and 200 V/°C input-offset-voltage drift provide a defined starting point for precision measurements, while fixed unity gain avoids an external gain-setting network. The user must still select input protection, reference strategy, supply rails, and grounding that preserve the device's specified accuracy and isolation behavior.
Recommended
Current and Voltage Monitoring
ISO122JP can be used in isolated current or voltage monitoring paths for power supplies, inverters, and industrial controllers. The 50 kHz bandwidth supports faster control-loop monitoring than a purely static measurement path while the isolation barrier helps separate high-side or field-side sensing from the controller. Ensure the input signal remains within the absolute maximum and common-mode limits, provide input filtering where needed, and design the PCB to preserve the manufacturer's isolation spacing recommendations.
Recommended
Process-Control Interfaces
ISO122JP supports isolated process-control interfaces where a low-frequency control or measurement signal must cross a high-voltage barrier. The fixed unity-gain arrangement and lack of required external operating components simplify the analog path, while the 4.5 V to 18 V supply range allows integration with conventional control electronics. Use the device only when its 50 kHz bandwidth is adequate for the process dynamics and validate isolation behavior under single-fault conditions in the final equipment.
Recommended
Recommended Products Summary
Engineering reference data for ISO122JP — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ISO122P | ISO122U | ISO124P | ISO124U | ISO124UE4 |
|---|---|---|---|---|---|---|
| Package | 8-PDIP | 8-PDIP candidate; exact package validation required | 8-PDIP candidate; exact package validation required | Related TI package candidate; exact compatibility unavailable | Related TI package candidate; exact compatibility unavailable | Related TI package candidate; exact compatibility unavailable |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Function | Precision isolation amplifier | ISO122-family isolation amplifier | ISO122-family isolation amplifier | Precision isolation amplifier | Precision isolation amplifier | Precision isolation amplifier |
Key Differentiators
- Verified ISO122 precision-performance baseline (vs ISO124P)
- Simple fixed-gain implementation (vs ISO124U)
- Clear isolation and supply specifications (vs ISO124UE4)
Design Notes
Keep the isolation barrier copper and package placement consistent with the TI datasheet and the applicable safety requirements. The 1500 Vrms figure describes the device isolation rating; it does not waive PCB creepage, clearance, insulation, or single-fault requirements. Avoid placing high-voltage conductors beneath or across the isolation gap, and maintain controlled copper and solder-mask spacing around the barrier.
Provide the ISO122JP with the specified 4.5 V to 18 V supply range and place local decoupling close to the supply pins. The device is specified with 5 mA quiescent current on VS1 and ±5.5 mA on VS2, so power-budget calculations should include load current, supply tolerances, startup behavior, and the current required by downstream circuitry. Verify the actual operating supplies against the manufacturer datasheet before finalizing the power tree.
Route the input and output analog signals away from high-current switching nodes and maintain short, controlled return paths. The 50 kHz bandwidth limits useful signal speed, but poor layout can still degrade offset, noise, and isolation performance. Use filtering appropriate to the measured signal, preserve the fixed unity-gain architecture, and validate common-mode and input-voltage limits on the assembled board.
Do not treat the ISO122 isolation barrier as a general-purpose high-voltage power path or assume that any isolation amplifier with a similar description is pin compatible. Confirm the exact 8-PDIP footprint, supply pins, input range, output range, and isolation requirements against the official datasheet. The related ISO124 candidates found in cross-reference searches require direct comparison before substitution.
Compliance Information
The supplied verified data does not explicitly state compliance status for ISO122JP. Do not infer RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status without the exact manufacturer documentation.
