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Texas Instruments ISO120BG
- Part No.:
- ISO120BG
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 24-CDIP (0.300", 7.62mm), 16 Leads
- Datasheet:
-
ISO120BG.pdf
- Description:
- IC OPAMP ISOLATION 1 CIRC 16CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,373
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Product details
Overview
ISO120BG from Burr-Brown Corporation is a precision isolation amplifier using duty-cycle modulation across a 2pF differential capacitive barrier, delivering 1500Vrms isolation, ±0.01% max nonlinearity, and 60kHz bandwidth (C1=C2=0). It operates from ±4.5V to ±18V supplies, supports bipolar ±10V output, and is used in industrial transducer isolation and 4–20mA loop systems requiring high IMR and stable offset drift.
For engineers reviewing the ISO120BG datasheet, ISO120BG pinout, ISO120BG application, or ISO120BG equivalent, this page provides verified technical context on carrier synchronization, isolation mode rejection (115dB at 60Hz), temperature range (–25°C to +85°C), hermetic 24-pin DIP package, and design-critical parameters including gain error (±0.1% FSR), VOS drift (±150 µV/°C), and C1/C2 capacitor-dependent bandwidth scaling.
Technical Context
The ISO120BG implements a laser-trimmed, dual-section architecture with galvanically isolated input and output stages linked by matched 1pF barrier capacitors. Its duty-cycle modulator integrates VIN/200kΩ against a switched ±100µA current source, generating a triangular waveform whose duty cycle encodes the input voltage.
Demodulation occurs via a differential sense amplifier driving a switched current source around output op-amp A2, with sample-and-hold stages removing ripple. Carrier frequency is user-controllable via external C1/C2 capacitors or an external ±4V sine/triangle signal applied to the Ext Osc pin - enabling synchronized rejection of beat frequencies and AC harmonics in multi-channel systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage Rating | 1500Vrms continuous AC (60Hz); enables safe interface between high-voltage field sensors and low-voltage control logic. |
| Nonlinearity | ±0.01% max FSR (with C1=C2=1000pF); ensures sub-100ppm accuracy for precision bridge and RTD measurements. |
| Input Offset Drift | ±150 µV/°C max (C1=C2=1000pF); maintains calibration stability over industrial temperature range without recalibration. |
| Small-Signal Bandwidth | 6 kHz (C1=C2=1000pF) or 60 kHz (C1=C2=0); selectable trade-off between noise immunity and response speed. |
| Isolation Mode Rejection | 115 dB at 60 Hz (1500Vrms); suppresses ground-loop-induced 50/60Hz interference in motor control and power monitoring. |
| Supply Voltage Range | ±4.5V to ±18V per side; supports flexible system-level power domain partitioning with low quiescent current (±4.0/±5.0 mA). |
| Operating Temperature | –25°C to +85°C (BG grade); qualified for industrial process control environments without derating. |
Pinout & Package
ISO120BG is housed in a 0.3"-wide 24-pin hermetic dual-in-line package (DIP), pin-compatible with ISO120G and ISO120SG variants. The package provides full galvanic isolation between input (Side 1) and output (Side 2) sections, with separate ground, supply, and signal commons.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 (Side 1) |
Signal Com 1, Gnd 1, –VS1, +VS1 | Input-side reference and power: Signal Com 1 serves as high-impedance bias return; Gnd 1 must remain within ±1V of Signal Com 1. |
| 5, 6, 7, 8 (Side 1) |
VIN, Sense, C1L, C1H | VIN accepts ±10V differential input; Sense connects to remote load for IR-drop compensation; C1H/C1L route external modulator capacitor (optional). |
| 9–12, 13–16 (Side 1 & 2) |
Com 2, Gnd 2, –VS2, +VS2 | Output-side isolation boundary: Com 2 and Gnd 2 are electrically isolated from Side 1; –VS2/+VS2 supply output stage. |
| 17–20 (Side 2) |
VOUT, C2L, C2H, Ext Osc | VOUT delivers ±10V analog output; C2L/C2H connect external demodulator capacitor; Ext Osc accepts ±4V sync signal for carrier locking. |
| 21–24 (Side 2) |
C2H, C2L, C1H, C1L | Duplicate terminals for layout symmetry; C2H/C2L must be guarded to Com 2 to preserve IMR; C1H/C1L similarly guarded to Com 1. |
Key Features
| Feature | Design Value |
|---|---|
| 100% partial discharge tested | 2500Vrms for 1s (≤5pC), ensuring long-term reliability of hermetic capacitive barrier under transient stress. |
| User-controlled carrier frequency | Free-running at ~500kHz or externally synchronized from 5kHz–700kHz via Ext Osc pin, enabling harmonic nulling in noisy systems. |
| Bipolar ±10V output | Supports direct interfacing with legacy industrial ADCs and analog controllers without level-shifting circuitry. |
| Low VOS drift (±150 µV/°C) | Enables uncalibrated operation over full –25°C to +85°C range in thermocouple and pressure bridge isolators. |
| Synchronization capability | Accepts ±3V–±5V sine/triangle or 25%–75% duty-cycle square wave directly; optional conditioning circuit extends to 10%–90% duty cycle. |
Applications
| Industrial Transducer Isolation | 4–20mA Loop Isolation |
|---|---|
Use Scenario: Isolating thermocouple, RTD, or strain gauge signals in chemical plant sensor networks where ground potentials differ by >100V. IC Role / Device Role / Timing Role: Precision analog signal coupler transmitting DC–6kHz sensor outputs across 1500Vrms barrier while rejecting common-mode noise. Use Value: Eliminates measurement errors from ground loops and enables single-point grounding of distributed I/O systems. |
Use Scenario: Converting 0–5V PLC outputs to isolated 4–20mA current loops driving remote actuators in hazardous areas. IC Role / Device Role / Timing Role: Input-side voltage-to-current conversion reference; output-side current loop driver interface with ±10V compliance. Use Value: Maintains <±0.01% linearity over temperature, ensuring traceable calibration in safety-critical flow metering. |
| Motor & SCR Control Feedback | Power Monitoring Systems |
Use Scenario: Isolating phase current feedback from high-dv/dt IGBT gate drivers in variable-frequency drives. IC Role / Device Role / Timing Role: High-IMR (115dB @ 60Hz) analog isolator capturing motor winding current with minimal offset drift. Use Value: Prevents false overcurrent trips caused by switching noise coupling into control logic through shared grounds. |
Use Scenario: Measuring AC line voltage/current in smart breakers and energy meters with Class I insulation requirements. IC Role / Device Role / Timing Role: Primary-side sensing front-end converting ±10V scaled inputs to isolated output for metrology ADCs. Use Value: Delivers certified 1500Vrms isolation and <150µV/°C VOS drift, meeting IEC 61000-4-5 surge immunity and long-term accuracy specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISO121BG | 3500Vrms isolation rating; 40-pin DIP package; higher θJA (25°C/W vs 40°C/W) | Required for medical or utility-grade systems needing >2500Vrms working voltage; larger footprint limits PCB density | Select ISO121BG only when 3500Vrms certification is mandated; ISO120BG suffices for standard industrial 1500Vrms applications. |
| AMC1301DWVR | Reinforced isolation (7000VPK); 8-pin SOIC; sigma-delta modulation; 20MHz bandwidth but fixed 8x gain | Targets modern digital power supplies and inverters with integrated ADC interfaces; lacks user-synchronizable carrier | Choose AMC1301DWVR for space-constrained designs needing digital output compatibility; ISO120BG remains preferred for analog-output legacy systems requiring adjustable bandwidth. |
Compared with ISO121BG and AMC1301DWVR, the ISO120BG offers optimal balance of proven hermetic reliability, analog output flexibility, and cost-effective 1500Vrms isolation in a compact 24-pin DIP - making it the standard choice for retrofitting analog industrial instrumentation without redesigning signal chains.
Availability
ISO120BG is available at Aetrix Electronics and suitable for industrial process control, motor drive feedback, and power monitoring applications requiring stable component supply, long-lifecycle support, and guaranteed hermetic packaging integrity.
Supply support for ISO120BG 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, renowned for high-precision isolation, data acquisition, and signal conditioning ICs.
The ISO120/121 family was designed specifically for high-reliability analog signal isolation in harsh industrial environments, emphasizing laser-trimmed matching, hermetic barrier integrity, and immunity to ground noise and transients.
FAQ
What is the maximum continuous isolation voltage rating for ISO120BG?
The ISO120BG is rated for 1500Vrms continuous AC isolation at 60Hz, with a corresponding 2121V DC rating. This rating is validated by 100% production partial discharge testing at 2500Vrms for 1 second (≤5pC), confirming barrier integrity under transient stress conditions typical in industrial power systems.
Can ISO120BG operate with asymmetric supply voltages on Side 1 and Side 2?
Yes, ISO120BG supports independent supply configurations: VS1 and VS2 may each be set between ±4.5V and ±18V, allowing asymmetric operation such as +15V/–5V on Side 1 and +12V/–12V on Side 2. However, input voltage range remains limited to ±10V regardless of supply asymmetry, and quiescent current scales with absolute supply magnitude on each side.
How does external capacitor selection affect ISO120BG bandwidth and stability?
External capacitors C1 and C2 directly set ISO120BG's small-signal bandwidth: with C1=C2=0, bandwidth reaches 60kHz; with C1=C2=1000pF, it drops to 6kHz. C2 must exceed 0.8×C1 for stability - e.g., C1=1000pF requires C2≥800pF. Larger C2 values further reduce bandwidth but improve ripple suppression and IMR at low frequencies.
Does ISO120BG require external components to achieve its specified 0.01% nonlinearity?
Yes - the ±0.01% max nonlinearity specification for ISO120BG is guaranteed only when external capacitors C1 and C2 are both set to 1000pF. Without them (C1=C2=0), nonlinearity degrades to ±0.05% max. The capacitors stabilize the internal integrator and demodulator time constants, reducing harmonic distortion and duty-cycle encoding errors.
What is the purpose of the C1H and C2H pins on ISO120BG, and how should they be routed?
C1H and C2H are high-impedance summing junction nodes for the input and output integrators. They are extremely sensitive to noise coupling: 1µA of injected current produces 200mV of output error. These pins must be guarded to their respective Signal Commons (Com 1 or Com 2) using dedicated low-impedance traces, and shielded from adjacent clock or power lines to maintain specified IMR and PSR performance.
ISO120BG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-CDIP (0.300", 7.62mm), 16 Leads
- Packaging:
- Tube
- 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:
- 5 mV
- Current - Supply:
- 4mA
- 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:
- 16-CDIP
ISO120BG FAQ
1.How can I place an order for ISO120BG through Aetrix?
Please submit a Request for Quotation (RFQ) for ISO120BG 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 ISO120BG reliable?
The price and inventory of ISO120BG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISO120BG is usually 5 days.
3.What payment methods are accepted for ISO120BG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISO120BG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISO120BG?
ISO120BG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISO120BG 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 ISO120BG?
For technical support, including ISO120BG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISO120BG requirements.
6.How does Aetrix verify that ISO120BG is sourced from the original manufacturer or authorized distributors?
All ISO120BG 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 ISO120BG meets industry standards.
7.What is the process for return or replacement of ISO120BG?
All ISO120BG units undergo pre-shipment inspection (PSI). If there is an issue with ISO120BG, 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 ISO120BG part is unused and in its original packaging.
Return procedure for ISO120BG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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