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Texas Instruments ISO103B
- Part No.:
- ISO103B
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 24-CDIP (0.600", 15.24mm), 16 Leads
- Datasheet:
-
ISO103B.pdf
- Description:
- IC OPAMP ISOLATION 1 CIRC 16CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,337
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Product details
Overview
ISO103B from Texas Instruments (formerly Burr-Brown) is a single-channel, transformer-coupled isolation amplifier with integrated isolated DC/DC power supply. It provides galvanic signal and power isolation up to 1500Vrms continuous, supports ±10V input range and ±10V output range, delivers ±50mA isolated output current, and operates across –25°C to +85°C for multichannel data acquisition and industrial loop-powered systems.
For engineers reviewing the ISO103B datasheet, ISO103B pinout, ISO103B application, or ISO103B equivalent, key selection considerations include its 20kHz small-signal bandwidth, built-in ±10V to ±18V input / ±50mA output isolated power, multichannel TTL synchronization capability, and side-brazed 24-pin ceramic DIP package rated for 5600Vpk test voltage.
Technical Context
The ISO103B uses a proprietary 800kHz oscillator-driven transformer for isolated power generation and a capacitor-coupled duty-cycle modulated signal path across a ceramic high-voltage barrier. Its internal DC/DC converter supplies ±VCC1 from ±VCC2, with soft-start and short-circuit current limiting on the isolated side.
Signal integrity is maintained via separate Com1/Com2 and Sense terminals to minimize IR drop errors, while Enable and Sync pins support low-power operation and synchronized multichannel deployment. The device implements laser-trimmed transmitter-receiver ICs and matched fringe capacitors for stable gain and offset performance without external calibration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 1500Vrms continuous AC, 5600Vpk 60Hz test - meets UL1244; enables safe interface between high-voltage field sensors and low-voltage control logic |
| Input Voltage Range | ±10V - accommodates standard industrial sensor outputs without external attenuation or amplification |
| Output Voltage Range | ±10V - directly interfaces with ADC inputs or analog controllers requiring bipolar signal levels |
| Isolated Power Output | ±50mA at ±14.25V to ±15.75V - powers external input conditioning circuitry (e.g., RTD bridges, op-amps) on isolated side |
| Small-Signal Bandwidth | 20kHz - supports accurate acquisition of fast transients in motor control feedback or vibration monitoring |
| Initial Gain Error | ±0.08% FSR - ensures <1mV error over ±10V span without trimming, critical for precision measurement systems |
| Nonlinearity | ±0.018% FSR (–10V to +10V) - preserves signal fidelity in closed-loop control where harmonic distortion affects stability |
| Sync Input Frequency | 1.2MHz to 2MHz TTL - enables deterministic timing alignment across ≥20 synchronized ISO103B channels |
Pinout & Package
ISO103B uses a 24-pin double-wide (0.6") side-brazed ceramic DIP (CDIP SB, drawing JVB), designed for high-voltage creepage and long-term reliability in industrial environments. Pin spacing and internal insulation support 1500Vrms continuous barrier rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | +VCC2 / –VCC2 / Gnd2 / Com2 | Primary-side power and reference - dual ground separation minimizes common-mode noise coupling into signal path |
| 9, 10, 11, 12 | VOUT / Sense / Gnd2 / Com2 | Isolated output stage - Sense terminal enables Kelvin sensing to reject load-line IR drop errors |
| 13 | Enable | Active-high TTL control - disables transformer drive while keeping demodulator active to reduce quiescent current in sleep mode |
| 14, 15, 16 | +VCC1 / Sync / –VCC1 | Isolated power outputs and sync input - Sync accepts 1.2–2MHz TTL clock for multichannel carrier phase alignment |
| 21, 22, 23, 24 | VIN / Com1 / Gnd1 / Ps Gnd | Signal input interface - Com1 and Gnd1 are electrically isolated but functionally distinct for optimal grounding topology |
Key Features
| Feature | Design Value |
|---|---|
| Built-in isolated DC/DC power | ±10V to ±18V input → ±14.25V to ±15.75V @ ±50mA output - eliminates need for external isolated supply in 4–20mA loop receivers |
| Multichannel TTL synchronization | Sync pin accepts 1.2–2MHz TTL clock - enables phase-coherent sampling across multiple ISO103B units for synchronized data acquisition |
| Separate Com1/Com2 and Sense terminals | Dedicated low-current return paths - reduces measurement error from conductor resistance in long cable runs or noisy plant floors |
| Soft-start and current-limited DC/DC converter | Internal protection against output shorts and inrush - ensures robust startup under variable load conditions without external fusing |
| 100% barrier breakdown tested | 5600Vpk for 10s + 1500Vrms for 60s - guarantees isolation integrity per UL1244, critical for safety-critical industrial equipment |
| Laser-trimmed signal channel | ±0.018% FSR nonlinearity, ±0.08% initial gain error - achieves precision without manual calibration or external trim components |
Applications
| Multichannel Isolated Data Acquisition | Isolated 4–20mA Loop Receiver |
|---|---|
Use Scenario: Simultaneous monitoring of temperature, pressure, and flow signals from multiple field instruments in a PLC rack. IC Role / Device Role / Timing Role: Signal and power isolator - transfers analog sensor outputs across barrier while powering front-end signal conditioning on the field side. Use Value: Enables synchronized sampling of ≥20 channels using shared TTL sync clock, eliminating beat-frequency interference and reducing system-level calibration effort. |
Use Scenario: Receiving and converting 4–20mA current-loop signals from hazardous-area transmitters into clean ±10V analog voltages for controller ADCs. IC Role / Device Role / Timing Role: Isolated loop receiver with auxiliary power - provides galvanic break while delivering ±50mA to power loop-powered sensors or local signal conditioning. Use Value: Eliminates ground loops and common-mode noise in distributed I/O systems, with built-in power removing need for separate isolated DC/DC converters. |
| Motor Control Feedback Isolation | Ground Loop Elimination in Test Equipment |
Use Scenario: Isolating phase current and bus voltage feedback signals in servo drives operating at 400VDC bus voltage. IC Role / Device Role / Timing Role: High-bandwidth analog isolator - maintains 20kHz signal fidelity for real-time current regulation while blocking high dv/dt transients from power stage switching. Use Value: Preserves closed-loop stability by minimizing propagation delay (<75µs settling) and phase shift (<1° at 1kHz), critical for field-oriented control algorithms. |
Use Scenario: Interfacing benchtop DMMs, oscilloscopes, or DAQ systems with devices under test that share different earth grounds. IC Role / Device Role / Timing Role: Precision analog isolator - breaks ground loops without attenuating or distorting low-level mV-level sensor outputs. Use Value: Reduces measurement noise floor by >40dB (130dB IMR at 1500Vrms), enabling accurate µV-level resolution in sensitive metrology applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AMC1301DWVR | Replaces transformer coupling with capacitive isolation; 200kHz bandwidth; ±250mV input range; requires external gain stage | Optimized for current sensing in motor drives; lacks integrated isolated power | Select when higher bandwidth and smaller footprint are prioritized over self-contained power and wide input range |
| ISO224BDWVR | Capacitive isolation; ±12V input range; ±10V output; no integrated isolated power; 100kHz bandwidth | Targets high-fidelity audio and precision instrumentation; requires external isolated supply | Choose for applications needing >10× higher bandwidth and lower THD+N, where external power is already available |
Compared with ISO103B, AMC1301DWVR offers higher bandwidth and smaller size but requires external signal conditioning and power, while ISO224BDWVR delivers superior dynamic performance but lacks on-chip power - making ISO103B uniquely suited for self-contained, wide-input-range isolated measurement where board space and component count are constrained.
Availability
ISO103B is available at Aetrix Electronics and suitable for multichannel data acquisition, isolated 4–20mA loop receivers, and motor control feedback systems requiring stable component supply amid long product lifecycles and industrial environmental stress.
Supply support for ISO103B 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 (TI) is a global semiconductor leader specializing in analog and embedded processing technologies, with deep heritage in precision signal chain solutions dating to Burr-Brown's acquisition in 2000.
The ISO103B belongs to TI's legacy isolation amplifier portfolio, engineered specifically for industrial process control and test equipment demanding simultaneous signal and power isolation in a single compact package.
FAQ
What is the maximum continuous isolation voltage rating for ISO103B?
The ISO103B is rated for 1500Vrms continuous AC isolation voltage at 60Hz, verified by 100% UL1244-compliant testing. This rating applies across its full operating temperature range of –25°C to +85°C and ensures reliable operation in industrial environments with high common-mode transients. The ISO103B also withstands 5600Vpk for 10 seconds during production screening.
Does ISO103B provide isolated power, and what are its output capabilities?
Yes, ISO103B integrates a transformer-coupled DC/DC converter that generates isolated ±VCC1 supplies. At ±15V output, it delivers ±50mA balanced load current with ±14.25V to ±15.75V regulation. Ripple is 5mVp-p with 1µF external capacitance, and line regulation is 1.12V/V - enabling direct powering of external op-amps, RTD bridges, or sensor signal conditioners on the isolated side.
How does the Sync pin function in ISO103B, and what frequency range is supported?
The Sync pin (Pin 15) accepts a TTL-level clock signal between 1.2MHz and 2MHz to synchronize the internal 800kHz carrier across multiple ISO103B units. This eliminates beat-frequency interference in multichannel systems. When unused, Sync must be grounded. The ISO103B supports >20 synchronized channels using a single PWS750-1 oscillator, provided total sync node capacitance remains below 1000pF.
Can ISO103B operate without external passive components like inductors or capacitors?
Yes, ISO103B can operate without external L or C components for basic functionality: pins 1–4 and 14–16 each contain internal 0.1µF bypass capacitors. However, for low-noise applications or loads exceeding ±15mA, TI recommends adding an LC filter (e.g., 10µH + 1µF) on the ±VCC1 outputs to suppress 800kHz ripple and improve regulation - especially when powering external circuitry.
What is the small-signal bandwidth and settling time specification for ISO103B?
The ISO103B has a 20kHz small-signal bandwidth and achieves 0.1% settling in 75µs for a ±10V step input. Its slew rate is 1.5V/µs, and gain flatness is maintained within ±0.1dB up to 10kHz. These characteristics make ISO103B suitable for dynamic measurements in motor control feedback, vibration analysis, and real-time process monitoring where fidelity at frequencies up to 20kHz is required.
ISO103B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-CDIP (0.600", 15.24mm), 16 Leads
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- Isolation
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1.5V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 20 kHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 20 mV
- Current - Supply:
- 90mA
- Current - Output / Channel:
- 15 mA
- Voltage - Supply Span (Min):
- 20 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -25°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-CDIP
ISO103B FAQ
1.How can I place an order for ISO103B through Aetrix?
Please submit a Request for Quotation (RFQ) for ISO103B 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 ISO103B reliable?
The price and inventory of ISO103B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISO103B is usually 5 days.
3.What payment methods are accepted for ISO103B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISO103B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISO103B?
ISO103B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISO103B 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 ISO103B?
For technical support, including ISO103B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISO103B requirements.
6.How does Aetrix verify that ISO103B is sourced from the original manufacturer or authorized distributors?
All ISO103B 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 ISO103B meets industry standards.
7.What is the process for return or replacement of ISO103B?
All ISO103B units undergo pre-shipment inspection (PSI). If there is an issue with ISO103B, 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 ISO103B part is unused and in its original packaging.
Return procedure for ISO103B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISO103B Tags
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LM358DT
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LM358DR
Texas Instruments
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LM2904DR
Texas Instruments
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LM358ADR
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MCP6006T-E/OT
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MCP6006UT-E/OT
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LM324PWR
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LM2902PWR
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LM2902DR
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LM358P
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