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Texas Instruments ISO122JU
- Part No.:
- ISO122JU
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 28-SOIC (0.295", 7.50mm Width), 8 Leads
- Datasheet:
-
ISO122JU.pdf
- Description:
- IC OPAMP ISOLATION 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:147
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Product details
Overview
ISO122JU from Texas Instruments is a precision isolation amplifier with galvanic barrier isolation, 1500 Vrms rated withstand voltage, 140 dB IMR at 60 Hz, ±10 V output swing, and 50 kHz small-signal bandwidth. It operates across dual ±4.5 V to ±18 V supplies and delivers 0.020% maximum nonlinearity for high-accuracy analog signal transmission in industrial transducer interfaces.
For engineers reviewing the ISO122JU datasheet, ISO122JU pinout, ISO122JU application, or ISO122JU equivalent, this page provides verified technical context, validated pin functions, real-world use cases in thermocouple amplification and 4–20 mA loop isolation, and confirmed alternative options with documented functional differences.
Technical Context
The ISO122JU employs duty-cycle modulation-demodulation across an embedded 2-pF differential capacitive barrier, enabling digital signal transmission without analog degradation from barrier characteristics. Its input section integrates VIN/200 kΩ current against a switched ±100-mA source, generating a 500 kHz carrier-modulated waveform.
The output demodulator reconstructs the analog signal using a sense amplifier, integrator A2, and sample-and-hold stages that suppress inherent 500 kHz ripple (20 mVp-p). Laser-trimmed circuitry ensures matched gain and offset between isolated sections, delivering stable ±200 µV/°C VOS drift and 2 V/µs slew rate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 1500 Vrms continuous - meets reinforced insulation requirements for industrial safety standards |
| Input-to-Output IMR | 140 dB at 60 Hz - rejects common-mode noise from ground loops in motor control or power monitoring |
| Nonlinearity | ±0.020% FSR - enables <1 LSB error in 12-bit system-level accuracy for RTD or pressure bridge interfaces |
| Small-Signal Bandwidth | 50 kHz - supports fast transient response in SCR gate drive feedback or battery stack monitoring |
| Supply Range | ±4.5 V to ±18 V - allows flexible biasing from isolated DC-DC converters or split-rail lab supplies |
| Output Drive | ±15 mA - directly drives 2 kΩ loads or low-pass filter op amps without external buffering |
| Quiescent Current | ±5 mA on VS1, ±5.5 mA on VS2 - enables low-power operation in battery-backed or energy-constrained systems |
Pinout & Package
ISO122JU is packaged in a 28-lead SOIC (DVA package), 20.01 mm × 6.61 mm body size, with creepage and clearance optimized for reinforced isolation. Pin 14 and pin 28 serve as separate ground references for low-side and high-side domains respectively, requiring physical separation on PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | High-side analog input | Accepts ±10 V differential input; internally referenced to GND1; supports overvoltage beyond supply rails via 200 kΩ input impedance |
| VOUT | Low-side analog output | Delivers unity-gain buffered ±10 V output; contains 20 mVp-p 500 kHz ripple requiring optional 2-pole filtering |
| +VS1 / –VS1 | High-side analog supply | Powers input section; ±4.5 V to ±18 V range; requires local 1 µF tantalum bypass near pins 1 and 2 |
| +VS2 / –VS2 | Low-side analog supply | Powers output section; independent of VS1; same voltage range; bypass required at pins 15 and 16 |
| GND1 | High-side ground reference | Pin 28 - return path for VIN and VS1; must be physically isolated from low-side ground plane |
| GND2 | Low-side ground reference | Pin 14 - return path for VOUT and VS2; forms isolated domain with no conductive connection to GND1 |
Key Features
| Feature | Design Value |
|---|---|
| Digital modulation barrier | 2-pF embedded capacitive isolation eliminates analog drift and aging effects seen in optocoupler-based isolators |
| Fixed unity-gain configuration | No external resistors needed - simplifies BOM and layout while guaranteeing gain accuracy within ±0.05% FSR |
| High-voltage reliability test | 100% tested to 2400 Vrms partial discharge limit per VDE0884 - confirms long-term barrier integrity under transient stress |
| Thermal stability | ±200 µV/°C input offset drift - maintains calibration stability across –25°C to +85°C operating range |
| Carrier frequency immunity | 500 kHz internal oscillator - avoids interference with standard 50/60 Hz power line harmonics and switching regulator noise |
Applications
| Transducer Isolation for Industrial Sensors | Ground Loop Elimination in Motor Control |
|---|---|
|
Use Scenario: Isolating millivolt-level outputs from thermocouples, RTDs, or strain gauges in noisy factory environments with multiple earth grounds. IC Role / Device Role / Timing Role: High-side VIN accepts sensor signal; low-side VOUT delivers clean ±10 V output to PLC ADC; galvanic barrier breaks ground loops. Use Value: 140 dB IMR at 60 Hz prevents 50/60 Hz pickup; ±0.020% nonlinearity preserves sensor resolution; ±10 V output matches standard DAQ input ranges. |
Use Scenario: Monitoring phase current or bus voltage in AC motor drives where high dV/dt noise couples into control circuits. IC Role / Device Role / Timing Role: VIN connects to shunt or Hall sensor on inverter side; VOUT feeds isolated current/voltage feedback to PWM controller. Use Value: 1500 Vrms isolation withstands IGBT switching transients; 50 kHz bandwidth captures current harmonics up to 5th order. |
| 4–20 mA Loop Isolation | PC-Based Data Acquisition Front-End |
|
Use Scenario: Converting isolated 4–20 mA process signals to 0–5 V for microcontroller ADCs in hazardous-area instrumentation. IC Role / Device Role / Timing Role: High-side powered by loop supply; VIN receives conditioned current signal; VOUT drives precision voltage buffer. Use Value: Bipolar ±10 V output accommodates zero-suppressed or reverse-acting loops; ±4.5 V min supply enables operation from 12 V loop sources. |
Use Scenario: Adding isolated analog inputs to USB or PCIe DAQ cards used in lab testing of power electronics or automotive ECUs. IC Role / Device Role / Timing Role: VIN interfaces with DUT under test; VOUT connects to card's ADC stage; dual supply domains prevent PC ground contamination. Use Value: 50 kHz bandwidth supports dynamic characterization of switching waveforms; 0.020% nonlinearity ensures traceable measurement accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISO124JU | Wider supply range (±4.5 V to ±22 V), higher 200 kHz bandwidth, but 0.05% nonlinearity and 1000 Vrms rating | Better suited for high-speed motor control feedback; less suitable for precision sensor conditioning where 140 dB IMR is critical | Select ISO124JU only when bandwidth >100 kHz is required and IMR >130 dB is acceptable |
| AMC1301DWVR | Reinforced isolation (7000 Vpk), 20 MHz bandwidth, but delta-sigma modulator output requiring external digital filter | Requires MCU or FPGA for decimation; not pin-compatible; targets modern digital acquisition over legacy analog systems | Choose AMC1301DWVR for new designs needing high CMTI (>100 kV/µs) and digital interface; avoid for drop-in analog replacement |
Compared with ISO122JU, ISO124JU trades precision and IMR for speed and supply flexibility, while AMC1301DWVR replaces analog output with digital bitstream - making ISO122JU uniquely suited for legacy analog signal chains requiring plug-and-play isolation without firmware changes.
Availability
ISO122JU is available at Aetrix Electronics and suitable for industrial process control, motor and SCR control, and PC-based data acquisition requiring stable component supply across extended product lifecycles.
Supply support for ISO122JU 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 expertise in precision signal chain and isolation solutions.
The ISO122JU belongs to TI's precision isolation amplifier product line, designed specifically for high-accuracy analog signal transmission across galvanic barriers in industrial automation, energy metering, and test equipment.
FAQ
What is the maximum continuous isolation voltage rating for ISO122JU?
The ISO122JU is rated for 1500 Vrms continuous isolation voltage per UL1577 and IEC60747-5-2 standards. It undergoes 100% production testing at 2400 Vrms for partial discharge, ensuring robust barrier integrity under transient overvoltage conditions without degradation.
Does ISO122JU require external components for basic operation?
No, ISO122JU operates in fixed unity-gain configuration with no external gain-setting resistors required. However, 1 µF tantalum bypass capacitors are mandatory on all four supply pins (+VS1, –VS1, +VS2, –VS2) placed adjacent to the device to suppress 500 kHz carrier feedthrough and ensure stable modulation-demodulation.
Can ISO122JU interface directly with a 4–20 mA current loop?
Yes, ISO122JU can interface with 4–20 mA loops using a precision shunt resistor (e.g., 250 Ω) on the high-side to convert current to 1–5 V, which falls within its ±10 V input range. The device's ±4.5 V minimum supply allows operation from common 12–24 V loop power supplies without additional regulation.
What is the purpose of separate GND1 and GND2 pins on ISO122JU?
GND1 (pin 28) serves as the high-side ground reference for VIN and VS1, while GND2 (pin 14) is the low-side ground for VOUT and VS2. These pins define two electrically isolated ground domains - maintaining galvanic separation requires physical PCB separation and no copper pours or vias bridging between them.
How does ISO122JU handle input signals above 250 kHz?
ISO122JU uses 500 kHz duty-cycle modulation, so input frequencies above 250 kHz exhibit aliasing behavior per Nyquist theory. The output generates lower-frequency replicas (e.g., 800 kHz IMV produces 200 kHz spurious content), as shown in Figure 9 of the SBOS160A datasheet - limiting usable bandwidth to 250 kHz for distortion-free operation.
ISO122JU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width), 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ISO122JU FAQ
1.How can I place an order for ISO122JU through Aetrix?
Please submit a Request for Quotation (RFQ) for ISO122JU 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 reliable?
The price and inventory of ISO122JU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISO122JU is usually 5 days.
3.What payment methods are accepted for ISO122JU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISO122JU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISO122JU?
ISO122JU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISO122JU 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?
For technical support, including ISO122JU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISO122JU requirements.
6.How does Aetrix verify that ISO122JU is sourced from the original manufacturer or authorized distributors?
All ISO122JU 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 meets industry standards.
7.What is the process for return or replacement of ISO122JU?
All ISO122JU units undergo pre-shipment inspection (PSI). If there is an issue with ISO122JU, 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 part is unused and in its original packaging.
Return procedure for ISO122JU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISO122JU Tags
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