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Texas Instruments ISO120SG
- Part No.:
- ISO120SG
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 24-CDIP (0.300", 7.62mm), 16 Leads
- Datasheet:
-
ISO120SG.pdf
- Description:
- IC OPAMP ISOLATION 1 CIRC 16CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,903
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Product details
Overview
ISO120SG from Burr-Brown Corporation is a precision isolation amplifier using duty-cycle modulation across a 2pF capacitive barrier, delivering ±10V bipolar output, 0.01% max nonlinearity, and 115dB IMR at 60Hz for high-reliability industrial signal conditioning. It operates over –55°C to +125°C with ±4.5V to ±18V dual supplies and supports synchronized carrier frequency control via Ext Osc pin.
For engineers reviewing the ISO120SG datasheet, ISO120SG pinout, ISO120SG application, or ISO120SG equivalent, this page provides verified technical context, package mapping, real-world use scenarios in ground-loop-critical systems, and validated alternative options - all grounded in the official SBOS158 datasheet and manufacturer specifications.
Technical Context
The ISO120SG implements a laser-trimmed, duty-cycle modulated architecture where input voltage is converted to a triangular waveform with variable duty cycle by an integrator (A1) and 150pF internal capacitor; the modulated signal crosses a hermetic 2pF differential capacitive barrier without analog degradation.
Demodulation on the output side uses a switched current source and feedback through a 200kΩ resistor to reconstruct VIN at Sense/VOUT, with sample-and-hold stages suppressing ripple; external capacitors C1 and C2 allow bandwidth tuning from 6kHz (C1=C2=1000pF) to 60kHz (C1=C2=0), and synchronization to external clocks from 5kHz to 700kHz is supported.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage Rating | 1500Vrms AC continuous - enables safe interface between high-voltage sensor domains and low-voltage control logic |
| Nonlinearity | ±0.01% max - ensures sub-100ppm accuracy in precision transducer signal chains |
| Input Offset Drift | ±150 µV/°C max - maintains calibration stability across full –55°C to +125°C operating range |
| IMR @ 60Hz | 115 dB - rejects common-mode noise from AC mains in industrial monitoring |
| Small-Signal Bandwidth | 60 kHz (C1=C2=0) - supports fast-response closed-loop motor control and power monitoring |
| Supply Range | ±4.5V to ±18V - accommodates legacy ±5V, ±12V, and ±15V system rails without regulation |
| Operating Temp Range | –55°C to +125°C - qualified for aerospace, downhole, and extended-temperature industrial environments |
Pinout & Package
ISO120SG is housed in a 0.3"-wide 24-pin hermetic DIP (package number 225), providing long-term reliability in harsh environments and enabling compatibility with standard DIP sockets and wave-solder processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 9, 10, 11, 12 | Signal Com 2 / Gnd 2 / –VS2 / +VS2 / Ext Osc / +VS1 / Gnd 1 / –VS1 | Power and reference connections for isolated output section (pins 1–4, 9–12) and input section (pins 13–24); Ext Osc enables external clock synchronization |
| 13, 14, 15, 16, 21, 22, 23, 24 | Signal / Com 1 / VIN / Sense / C2L / C2H / C1L / C1H | Input signal path (VIN, Signal, Com 1), output sensing (Sense), and external capacitor nodes (C1H/C1L, C2H/C2L) - guarding these pins is critical for IMR and PSR performance |
| 17, 18, 19, 20 | VOUT / C2H / C2L / C1H | VOUT delivers reconstructed analog output; C1H/C2H are high-impedance summing junctions highly sensitive to EMI - must be guarded to respective Com pins |
Key Features
| Feature | Design Value |
|---|---|
| 100% partial discharge tested | 2500Vrms for 1s at ≤5pC - guarantees dielectric integrity of hermetic barrier for life-critical isolation |
| User-controllable carrier frequency | Configurable from 5kHz to 700kHz via Ext Osc and external C1/C2 - enables noise rejection at specific interference frequencies |
| Bipolar ±10V output | Direct interface with ±10V ADCs, PLC analog inputs, and bipolar op-amp stages without level-shifting |
| Wide supply range | ±4.5V to ±18V operation - eliminates need for dedicated isolated DC/DC converters in multi-rail systems |
| Synchronization capability | Locks to external sine/triangle/square waves - prevents beat frequencies in multi-channel data acquisition |
Applications
| Industrial Process Control | Motor & SCR Control |
|---|---|
Use Scenario: Isolating thermocouple or RTD signals in chemical plant reactor monitoring where ground potentials differ by >1kV between field sensors and DCS cabinets. IC Role / Device Role / Timing Role: Precision signal isolator converting ±10V sensor outputs to clean, ground-referenced analog for 16-bit ADCs while blocking CM noise. Use Value: Maintains 0.01% linearity and 115dB IMR despite 60Hz ground loops and 20kV/µs transients - eliminating measurement drift and false trips. | Use Scenario: Closed-loop current sensing in three-phase VFDs where IGBT switching induces >100Vpk common-mode spikes on shunt resistors. IC Role / Device Role / Timing Role: High-bandwidth (60kHz) isolation amplifier feeding current feedback to PWM controller, rejecting dv/dt-induced errors. Use Value: Enables stable torque control under fast-switching conditions due to 20kV/µs barrier dv/dt rating and 60kHz small-signal bandwidth. |
| Power Monitoring | Biomedical Measurements |
Use Scenario: Isolating voltage and current sense signals in utility-grade energy meters interfacing 400VAC mains to microcontroller-based metrology ICs. IC Role / Device Role / Timing Role: Galvanic barrier for analog front-end, transmitting scaled AC waveforms while meeting IEC 61000-4-5 surge immunity requirements. Use Value: 1500Vrms isolation rating and 2500Vrms partial discharge test ensure compliance with EN 50160 and UL 508 over product lifetime. | Use Scenario: Right-leg drive circuitry in ECG amplifiers requiring patient-isolated signal paths with ultra-low leakage (<0.5µArms). IC Role / Device Role / Timing Role: Isolation amplifier in feedback loop of driven-right-leg circuit, rejecting 50/60Hz interference while preserving microvolt-level bio-signals. Use Value: 0.18–0.5µArms leakage at 240Vrms and –55°C to +125°C operation support Class III medical device certification and cold-chain transport validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISO120BG | Same core architecture and pinout; rated for –25°C to +85°C only - no extended temperature qualification | Limited to commercial/industrial ambient environments; not suitable for aerospace or downhole use | Select ISO120BG only when full –55°C to +125°C operation is unnecessary and cost optimization is prioritized |
| AMC1301DWVR | Second-generation reinforced isolation amplifier; 7kVrms rating, integrated ±250mV input range, 20MHz bandwidth, but requires external reference and digital filtering | Designed for current sensing in inverters; lacks direct ±10V output and user-synchronizable carrier | Choose AMC1301DWVR for high-speed motor control with integrated delta-sigma conversion - not a drop-in replacement for ISO120SG's analog-output, wide-supply architecture |
Compared with ISO120BG, the ISO120SG adds guaranteed operation down to –55°C and up to +125°C with identical electrical specs; versus AMC1301DWVR, it offers direct ±10V analog output and external clock sync - making it superior for legacy analog signal chains requiring wide temp range and deterministic timing.
Availability
ISO120SG is available at Aetrix Electronics and suitable for industrial process control, motor control, power monitoring, and biomedical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ISO120SG 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
Burr-Brown Corporation was a U.S.-based analog semiconductor pioneer, acquired by Texas Instruments in 2000, known for high-precision signal conditioning ICs with military- and aerospace-grade reliability.
The ISO120/121 family was designed specifically for high-fidelity analog signal isolation in electrically noisy, high-voltage industrial environments - emphasizing long-term stability, hermetic packaging, and immunity to ground-loop-induced errors.
FAQ
What is the maximum continuous isolation voltage rating for ISO120SG?
The ISO120SG has a rated continuous isolation voltage of 1500Vrms at 60Hz and 2121VDC, verified per manufacturer specification and 100% production-tested to 2500Vrms for 1 second with ≤5pC partial discharge. This rating applies across its full –55°C to +125°C operating temperature range and is distinct from the ISO121's 3500Vrms rating.
Does ISO120SG require external components to achieve its 0.01% nonlinearity specification?
Yes - the 0.01% max nonlinearity specification for ISO120SG is guaranteed only when external capacitors C1 and C2 are set to 1000pF each, resulting in a 6kHz bandwidth. With C1=C2=0, bandwidth increases to 60kHz but nonlinearity degrades to ±0.05% max per the SBOS158 datasheet.
Can ISO120SG operate with asymmetric supply voltages such as +15V and –5V?
No - ISO120SG requires symmetrical dual supplies (e.g., ±4.5V, ±12V, ±15V) as specified in the absolute maximum ratings and electrical characteristics tables; asymmetric rails violate the ±18V limit per supply and risk exceeding internal bias constraints, potentially causing gain error or latch-up.
What is the purpose of the C1H and C2H pins on ISO120SG, and why must they be guarded?
C1H and C2H are the high-impedance summing junctions of the internal integrators; coupling AC or DC current into them causes VERROR = IERROR × 200kΩ at the output. Guarding them to their respective Signal Commons (C1L/C2L) prevents EMI-induced degradation of IMR and PSR - a mandatory layout practice confirmed in the ISO120/121 application notes.
How does the ISO120SG handle overload recovery, and what is its typical recovery time?
ISO120SG exhibits overload recovery behavior tied to its settling time: for a 50% output overload with C1=C2=0, recovery takes 150µs (typical), approximately three times the 50µs 0.1% settling time under same conditions. This is documented in Note (3) of the SBOS158 datasheet and reflects the demodulator's inherent response to saturated duty-cycle modulation.
ISO120SG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-CDIP (0.300", 7.62mm), 16 Leads
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- Isolation
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 2V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 60 kHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 10 mV
- Current - Supply:
- 4mA
- Current - Output / Channel:
- 15 mA
- Voltage - Supply Span (Min):
- 9 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-CDIP
ISO120SG FAQ
1.How can I place an order for ISO120SG through Aetrix?
Please submit a Request for Quotation (RFQ) for ISO120SG 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 ISO120SG reliable?
The price and inventory of ISO120SG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISO120SG is usually 5 days.
3.What payment methods are accepted for ISO120SG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISO120SG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISO120SG?
ISO120SG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISO120SG 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 ISO120SG?
For technical support, including ISO120SG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISO120SG requirements.
6.How does Aetrix verify that ISO120SG is sourced from the original manufacturer or authorized distributors?
All ISO120SG 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 ISO120SG meets industry standards.
7.What is the process for return or replacement of ISO120SG?
All ISO120SG units undergo pre-shipment inspection (PSI). If there is an issue with ISO120SG, 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 ISO120SG part is unused and in its original packaging.
Return procedure for ISO120SG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISO120SG Tags
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