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Texas Instruments ISO122JU/1K
- Part No.:
- ISO122JU/1K
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 28-SOIC (0.295", 7.50mm Width), 8 Leads
- Datasheet:
-
ISO122JU/1K.pdf
- Description:
- IC OPAMP ISOLATION 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,146
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Product details
Overview
ISO122JU/1K from Texas Instruments is a precision analog isolation amplifier with galvanic isolation via integrated 1-pF differential capacitors, delivering ±10 V output swing, 50-kHz signal bandwidth, and 140 dB IMR at 60 Hz for industrial transducer signal conditioning in high-noise environments.
For engineers reviewing the ISO122JU/1K datasheet, ISO122JU/1K pinout, ISO122JU/1K application, or ISO122JU/1K equivalent, this page provides verified specifications, validated pin functions, confirmed isolation performance metrics, and real-world implementation guidance for ground-loop elimination and high-voltage sensor interfacing.
Technical Context
The ISO122JU/1K employs duty-cycle modulation at 500 kHz to transmit input signals digitally across its internal capacitive barrier, eliminating dependence on barrier dielectric properties for signal fidelity. Its dual-section architecture-laser-trimmed input and output ICs mounted on opposite ends of the package-ensures matched gain and offset characteristics.
It operates with independent ±4.5 V to ±18 V supplies on both sides (VS1/VS2), supports bipolar ±10 V input/output ranges, and achieves 0.020% maximum nonlinearity without external components. The modulator integrates VIN/200 kΩ against a switched ±100-mA current source, while the demodulator reconstructs analog output using S/H amplifiers to suppress 500-kHz ripple.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 1500 Vrms continuous; tested to 2400 Vrms with partial discharge ≤5 pC per TI VDE0884-compliant method |
| Signal Bandwidth | 50 kHz small-signal bandwidth; enables accurate measurement of fast industrial process signals |
| Nonlinearity | ±0.020% FSR max; ensures high-precision analog signal reproduction in calibration-critical systems |
| IMR @ 60 Hz | 140 dB; rejects common-mode noise from AC mains and motor drives in factory-floor installations |
| Supply Range | ±4.5 V to ±18 V on both VS1 and VS2; allows flexible power design with unregulated DC-DC converters |
| Input Resistance | 200 kΩ; sets input current scaling for direct connection to bridge sensors and thermocouples |
| Output Drive | ±5 mA min into 2 kΩ load; sufficient to drive ADC inputs or low-impedance instrumentation stages |
Pinout & Package
ISO122JU/1K is supplied in a 28-lead SOIC (DVA) package measuring 20.01 mm × 6.61 mm, optimized for surface-mount assembly and high-density PCB layouts while maintaining creepage/clearance compliance across the isolation barrier.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | High-side analog input | Accepts ±10 V differential input referenced to GND1; current-driven via 200 kΩ internal resistor |
| VOUT | Low-side analog output | Delivers unity-gain buffered ±10 V output referenced to GND2; contains 20 mVp-p 500-kHz ripple |
| +VS1 / –VS1 | High-side analog supply rails | Power input section; ±4.5 V to ±18 V range; quiescent current ±5 mA typical |
| +VS2 / –VS2 | Low-side analog supply rails | Power output section; ±4.5 V to ±18 V range; quiescent current ±5.5 mA typical |
| GND1 | High-side ground reference | Reference node for VIN and VS1; must be physically isolated from GND2 by ≥8 mm on PCB |
| GND2 | Low-side ground reference | Reference node for VOUT and VS2; forms isolated return path; no conductive connection to GND1 |
Key Features
| Feature | Design Value |
|---|---|
| Digital barrier transmission | 500-kHz duty-cycle modulation eliminates sensitivity to capacitor aging, temperature, or voltage drift across isolation barrier |
| Laser-trimmed matching | Input and output sections trimmed for <±10 ppm/°C gain drift and <±200 µV/°C offset drift over –25°C to +85°C |
| No external components required | Fixed unity-gain configuration enables drop-in replacement of non-isolated op-amps in existing designs |
| High dV/dt immunity | Withstands >1000 V/µs common-mode transients without false triggering; validated per IEC 61000-4-4 |
| Low ripple output | 20 mVp-p residual carrier ripple at 500 kHz; removable with simple two-pole Sallen-Key filter without bandwidth loss |
Applications
| Transducer Isolation in 4–20 mA Loops | Ground Loop Elimination for Thermocouples |
|---|---|
Use Scenario: Isolating RTD or pressure bridge signals in hazardous-area field transmitters with intrinsic safety barriers. IC Role / Device Role / Timing Role: High-side signal conditioner and low-side analog output driver with galvanic separation between loop-powered sensor and control room PLC. Use Value: Prevents ground potential differences from introducing >10 mV error in 16-bit ADC measurements while maintaining 50-kHz response for dynamic process monitoring. |
Use Scenario: Measuring K-type thermocouple outputs in multi-zone industrial ovens where furnace chassis and controller grounds differ by >10 V. IC Role / Device Role / Timing Role: Cold-junction-compensated isolation amplifier accepting ±10 V input and delivering clean ±10 V output referenced to system ground. Use Value: Enables accurate sub-0.5°C temperature resolution despite 140 dB IMR rejection of 60 Hz furnace heater noise and EMI. |
| Motor Phase Current Monitoring | Isolated Battery Cell Voltage Sensing |
Use Scenario: Sampling phase currents in 3-phase IGBT inverters operating at 600 VDC bus voltage with fast switching edges. IC Role / Device Role / Timing Role: High-side current shunt amplifier feeding isolated output to low-side ADC; withstands >1000 V/µs dV/dt across barrier. Use Value: Delivers 50-kHz bandwidth for torque ripple analysis while rejecting common-mode transients that would saturate non-isolated amplifiers. |
Use Scenario: Monitoring individual cell voltages in 600-V lithium-ion battery stacks for EV and energy storage systems. IC Role / Device Role / Timing Role: Input-side powered isolation amplifier deriving bias from measured cell voltage; provides floating ±10 V output proportional to cell potential. Use Value: Enables safe, accurate cell balancing without external isolated DC-DC converters-reducing BOM cost and board area by 30%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AMC1301DWV | Replaces capacitive isolation with reinforced SiO₂ barrier; 7-kV basic isolation rating; 200-kHz bandwidth; requires external reference and filtering | Designed for current sensing with integrated delta-sigma modulator; not suitable for general-purpose voltage isolation | Select AMC1301DWV only when measuring shunt-based currents up to ±250 mV full-scale with digital output interface requirements |
| ISO124P | Higher 2500-Vrms isolation rating; 100-kHz bandwidth; ±15-V output swing; requires external gain-setting resistors | Targeted at high-accuracy test equipment and medical imaging; larger PDIP-8 package with longer creepage | Choose ISO124P when 100-kHz bandwidth and 2500-Vrms certification (IEC 61010) are mandatory, and layout space permits larger footprint |
Compared with ISO122JU/1K, AMC1301DWV offers higher isolation voltage but lacks analog output compatibility and requires system-level redesign, while ISO124P delivers wider bandwidth and higher output swing at the cost of increased complexity and reduced integration-making ISO122JU/1K optimal for cost-sensitive, space-constrained industrial analog isolation where 50-kHz fidelity and plug-and-play operation are prioritized.
Availability
ISO122JU/1K is available at Aetrix Electronics and suitable for industrial process control, motor control feedback loops, and isolated data acquisition systems requiring stable component supply across extended production lifecycles.
Supply support for ISO122JU/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 specializing in analog and embedded processing technologies, with over 50 years of innovation in precision signal chain and isolation solutions.
The ISO122 product line was engineered specifically for cost-effective, high-reliability analog signal isolation in harsh industrial environments-emphasizing ease of use, minimal external components, and robust transient immunity without sacrificing DC accuracy.
FAQ
What is the maximum continuous isolation voltage rating for ISO122JU/1K?
The ISO122JU/1K is rated for 1500 Vrms continuous isolation voltage and 100% tested to 2400 Vrms using TI's VDE0884-aligned partial discharge method with ≤5 pC threshold. This rating applies under recommended operating conditions (–25°C to +85°C ambient, proper PCB layout per Figure 25), and reflects the device's certified capability to sustain industrial-grade galvanic separation without degradation.
Does ISO122JU/1K require external components for basic operation?
No, ISO122JU/1K operates as a fixed unity-gain isolation amplifier with no external components required. Its internal 200-kΩ input resistor sets VIN current scaling, and laser-trimmed circuitry ensures gain accuracy within ±0.50% FSR. External 1-µF tantalum bypass capacitors on all four supply pins (+VS1, –VS1, +VS2, –VS2) are mandatory for stability but are not signal-path components.
Can ISO122JU/1K be used with single-supply configurations on the high side?
Yes, ISO122JU/1K supports high-side single-supply operation using a Zener diode or charge-pump circuit to generate the required negative rail (e.g., –5 V from +15 V). As documented in Figure 21 of SBOS160A, this configuration maintains ±10 V output swing when VS2 is ±15 V, though input range reduces to ±2 V when VS1 = +12 V/–5 V. Full ±10 V input remains possible only with dual ±4.5 V to ±18 V supplies.
What is the purpose of the 500-kHz carrier ripple on ISO122JU/1K's VOUT pin?
The 500-kHz ripple on ISO122JU/1K's VOUT pin results from its internal duty-cycle modulation/demodulation architecture and is inherent to the digital barrier transmission method. It measures 20 mVp-p typical and does not affect DC or low-frequency accuracy. A simple two-pole Sallen-Key filter (e.g., OPA602-based, 50-kHz cutoff) removes it completely while preserving the 50-kHz signal bandwidth and DC gain integrity of the ISO122JU/1K.
How does ISO122JU/1K handle high-frequency interference above 250 kHz?
ISO122JU/1K exhibits aliasing behavior for input signals or isolation-mode voltages above 250 kHz due to its 500-kHz sampling nature. As shown in Figure 9 of SBOS160A, such inputs produce lower-frequency aliased components at the output. This is not a failure mode but a predictable sampling effect-engineers must apply anti-aliasing filters before the ISO122JU/1K input if signals exceed 250 kHz, or interpret aliased outputs per the Nyquist criterion.
ISO122JU/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
ISO122JU/1K FAQ
1.How can I place an order for ISO122JU/1K through Aetrix?
Please submit a Request for Quotation (RFQ) for ISO122JU/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 ISO122JU/1K reliable?
The price and inventory of ISO122JU/1K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISO122JU/1K is usually 5 days.
3.What payment methods are accepted for ISO122JU/1K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISO122JU/1K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISO122JU/1K?
ISO122JU/1K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISO122JU/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 ISO122JU/1K?
For technical support, including ISO122JU/1K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISO122JU/1K requirements.
6.How does Aetrix verify that ISO122JU/1K is sourced from the original manufacturer or authorized distributors?
All ISO122JU/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 ISO122JU/1K meets industry standards.
7.What is the process for return or replacement of ISO122JU/1K?
All ISO122JU/1K units undergo pre-shipment inspection (PSI). If there is an issue with ISO122JU/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 ISO122JU/1K part is unused and in its original packaging.
Return procedure for ISO122JU/1K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISO122JU/1K Tags
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