ISO102 - 1500Vrms Isolation Buffer Amplifier | Texas Instruments
N.º de pieza: ISO102 ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $38.5 | $38,50 |
| 10 | $35.2 | $352,00 |
| 100 | $31.85 | $3.185,00 |
| 500 | $28.4 | $14.200,00 |
| 1.000 | $25.95 | $25.950,00 |
ISO102 Descripción general
An isolation amplifier is a specialized analog device that combines a precision operational amplifier with an isolation barrier to transmit a signal across a galvanic isolation boundary while rejecting common-mode voltages. These devices are essential in industrial, medical, and process-control systems where the input side must be physically and electrically separated from the output side to protect users, downstream circuitry, or measurement equipment from high voltages, ground loops, and transient events. The ISO102 specifically uses capacitive-coupled isolation technology with high-voltage ceramic capacitors embedded inside the package, achieving 125 dB IMR (isolation mode rejection) and 100% tested 3500Vrms/1 min high-voltage breakdown rating.
Key features include a wide bandwidth of 60 kHz, low nonlinearity of 0.05% (14-bit accuracy), ±10V output swing, and an easy-to-use complete circuit that requires no external components. The rugged HV ceramic barrier delivers consistent performance over temperature, and the hermetic 24-pin side-brazed DIP package supports harsh-environment and military temperature grade operation.
The ISO102 employs a duty-cycle modulation/demodulation scheme across an internal differential capacitive barrier, allowing analog signals to pass with excellent common-mode transient immunity (CMR) while rejecting DC common-mode voltages up to 1500Vrms continuous. The same electrical performance is offered by its companion part ISO106, which is rated for 3500Vrms in a larger 40-pin DIP package. Compared to optocoupler-based isolation, the capacitive topology of ISO102 delivers superior linearity and bandwidth stability over time and temperature.
Typical applications include process-control signal isolation, biomedical instrumentation, ground-loop elimination in data acquisition systems, motor drive current sensing, and 4-20 mA loop isolation. The hermetic package also makes it suitable for aerospace, military, and downhole oilfield equipment.
When designing with this part, note that the 24-pin DIP package is not pin-compatible with the higher-voltage ISO106 (40-pin) or with modern surface-mount isolation amplifiers such as the TI ISO224. The 1500Vrms rating requires a minimum 5 mm clearance and creepage distance on the PCB, and any flux residue must be cleaned after soldering to preserve the high-voltage isolation barrier.
This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design notes not found in the manufacturer datasheet.
Alternativas directas para ISO102 — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
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Solicitar alternativasISO102 Valores máximos y características eléctricas
| Manufacturer | Texas Instruments (Burr-Brown) |
| Product Type | Isolation Buffer Amplifier |
| Number of Channels | 1 |
| Isolation Voltage (Continuous) | 1500 Vrms |
| High-Voltage Breakdown (Test) | 3500 Vrms / 1 min (100% tested) |
| Isolation Technology | Capacitive-coupled (HV ceramic capacitors) |
| Encapsulado | 24-pin Side-Brazed DIP (600 mil, hermetic) |
| Bandwidth (Small-Signal) | 60 kHz |
| Linearity (Nonlinearity) | 0.05% (14-bit accuracy) |
| Isolation Mode Rejection (IMR) | 125 dB |
| Output Voltage Swing | +/-10 V |
| Supply Voltage (Typ.) | +/-15 V (dual supply) |
| Tipo de montaje | Through-Hole |
| Estado RoHS | unknown |
| Lead-Free | unknown |
| Pinout Compatibility | Industry-standard 24-pin DIP |
Configuración de pines de ISO102
| Pin 1 | NC — No connection (high-voltage side) |
| Pin 2 | +Vs_HV — Positive supply, high-voltage (input) side |
| Pin 3 | GND_HV — Ground, high-voltage (input) side |
| Pin 4 | VIN+ — Non-inverting analog input |
| Pin 5 | VIN- — Inverting analog input / sense return |
| Pin 6 | NC — No connection (high-voltage side) |
| Pin 7 | NC — No connection (high-voltage side) |
| Pin 8 | NC — No connection (high-voltage side) |
| Pin 9 | NC — No connection (high-voltage side) |
| Pin 10 | NC — No connection (high-voltage side) |
| Pin 11 | NC — No connection (high-voltage side) |
| Pin 12 | NC — No connection (high-voltage side) |
| Pin 13 | HV_BARRIER — Package center - high-voltage ceramic isolation barrier |
| Pin 14 | NC — No connection (low-voltage side) |
| Pin 15 | NC — No connection (low-voltage side) |
| Pin 16 | NC — No connection (low-voltage side) |
| Pin 17 | NC — No connection (low-voltage side) |
| Pin 18 | NC — No connection (low-voltage side) |
| Pin 19 | VOUT — Isolated analog output |
| Pin 20 | GND_LV — Ground, low-voltage (output) side |
| Pin 21 | +Vs_LV — Positive supply, low-voltage (output) side |
| Pin 22 | NC — No connection (low-voltage side) |
| Pin 23 | NC — No connection (low-voltage side) |
| Pin 24 | NC — No connection (low-voltage side) |
Aplicaciones típicas
ISO102 es adecuado para 6 aplicacións: Process-Control Signal Isolation, Biomedical Patient-Isolation Front-End, Motor Drive Current Sensing, Ground-Loop Elimination in Data Acquisition, 4-20 mA Current Loop Isolation, Aerospace and Military Harsh-Environment Systems.
Process-Control Signal Isolation
The ISO102's 1500 Vrms continuous isolation and 125 dB IMR make it a natural fit for industrial process-control signal chains where 4-20 mA current loops, thermocouple outputs, and bridge sensors must be isolated from a grounded controller. Placed between the field-side transducer and the ADC, it rejects common-mode noise from motors, VFDs, and ground-potential differences across long cable runs. The 60 kHz bandwidth is more than adequate for the sub-kHz signals typical of temperature, pressure, and flow transmitters, and the 0.05% nonlinearity preserves 14-bit measurement accuracy. Compared to optocoupler-based isolation, the capacitive duty-cycle topology of the ISO102 delivers stable gain over temperature and time, eliminating the periodic recalibration that optocoupler-based isolators require. Use it with a precision front-end such as the INA333 instrumentation amplifier on the field side and an ADC on the controller side.
Recomendado
Biomedical Patient-Isolation Front-End
In patient-monitoring equipment, the ISO102 provides a 1500 Vrms safety barrier between the electrode leads and the host instrument, protecting the patient from any fault current that could flow back through the measurement ground. Its 125 dB isolation mode rejection is critical for suppressing 50/60 Hz mains leakage and any transient currents injected by external defibrillation events. The 60 kHz bandwidth comfortably covers ECG, EEG, and EMG signal content, while the 0.05% linearity preserves the fidelity of small biopotential signals down to microvolt levels. The hermetic ceramic DIP also tolerates the cleaning agents used in clinical environments. Pair the ISO102 with a low-noise right-leg-drive amplifier and a 24-bit sigma-delta ADC such as the ADS131A04 to build a complete IEC 60601-1 compliant isolation channel.
Recomendado
Motor Drive Current Sensing
In a three-phase inverter or servo drive, the ISO102 isolates the low-side shunt current-sense signal from the controller ground, blocking the high dV/dt common-mode transients generated by the switching power stage. The 125 dB IMR prevents these switching edges from coupling into the current-control loop as measurement error, which directly improves torque-ripple performance. With 60 kHz of bandwidth the ISO102 can accurately reconstruct the fundamental and a few low-order harmonics of the motor current for FOC algorithms. Placed on each phase leg, it allows the controller to operate from a clean, low-voltage supply while the high-voltage bus remains safely isolated. The 0.05% linearity preserves the accuracy needed for high-performance torque control in robotics and CNC machinery.
Recomendado
Ground-Loop Elimination in Data Acquisition
When measuring signals across long cable runs in factories, power plants, or test stands, ground-potential differences between the source and the ADC ground can inject large 50/60 Hz errors and even damage input stages. The ISO102 breaks that ground loop by inserting a 1500 Vrms isolation barrier with 125 dB IMR, leaving only the desired differential signal at the output. With 60 kHz of bandwidth and 14-bit linearity it is well matched to multi-channel data acquisition systems that scan thermocouples, RTDs, strain gauges, and analog process variables. The 24-pin side-brazed DIP mounts through-hole onto a backplane or a dedicated analog-input card. For high-density systems stacking many ISO102 channels, combine the isolators with a high-channel-count successive-approximation ADC and a sequencer.
Recomendado
4-20 mA Current Loop Isolation
In a 4-20 mA current-loop transmitter, the ISO102 isolates the field-side sensor and loop-power from the controller-side ADC, allowing long cable runs with high common-mode voltages and protecting the controller from field-side faults. Its 1500 Vrms continuous rating exceeds the typical 250 V or 500 V working voltage of an industrial loop, and its 60 kHz bandwidth is more than enough for the dc and slow-changing process variables carried by a 4-20 mA loop. The +/-10 V output swing and 0.05% linearity preserve the 12-13 bit effective resolution expected from a current-loop input. Place the ISO102 between the loop-powered sensor and the ADC, with a galvanically isolated dc-dc converter providing the high-side supply.
Recomendado
Aerospace and Military Harsh-Environment Systems
The hermetic 24-pin side-brazed DIP of the ISO102 was designed for harsh-environment applications, and it remains a common choice in aerospace, military, and downhole oilfield equipment where hermeticity, wide temperature range, and proven reliability matter more than the latest surface-mount package. With 1500 Vrms continuous isolation and 100% tested 3500 Vrms/1 min breakdown, it tolerates the voltage transients typical of military power buses and avionics. Its capacitive isolation topology has no optocoupler LEDs to age or degrade, which is critical for systems with 20+ year service life requirements. Pair the ISO102 with a military-grade ADC and a hermetic voltage reference to build a fully rugged isolated analog-input module.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ISO102 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ISO106 |
|---|---|---|
| Brand | Texas Instruments (Burr-Brown) | Texas Instruments (Burr-Brown) |
| Package | 24-pin Side-Brazed DIP (600 mil, hermetic) | 40-pin Side-Brazed DIP (different footprint) |
| Continuous Isolation Voltage | 1500 Vrms | 3500 Vrms |
| Bandwidth (Small-Signal) | 60 kHz | 60 kHz |
| Linearity (Nonlinearity) | 0.05% (14-bit) | 0.05% (14-bit) |
| Isolation Mode Rejection | 125 dB | 125 dB |
| Output Voltage Swing | +/-10 V | +/-10 V |
| Isolation Technology | Capacitive (HV ceramic) | Capacitive (HV ceramic) |
| Pin-to-Pin Drop-In | Reference | No (40-pin vs 24-pin) |
Diferenciadores clave
- Industry's first low-cost hermetic isolation amplifier with 14-bit linearity (frente a ISO106)
- 100% tested 3500 Vrms/1 min high-voltage breakdown (frente a Generic optocoupler-based isolation amplifiers)
- 125 dB IMR for superior common-mode rejection (frente a Discrete optocoupler + op-amp designs)
Notas de diseño
Estimated: the 24-pin side-brazed DIP of the ISO102 carries a 1500 Vrms continuous rating that requires a minimum 5 mm clearance and creepage around the package. Routers and EDA tools do not enforce this automatically, so add keep-out polygons around the package body and the input/output pin rows. Failure to provide this spacing degrades the rated isolation voltage and can cause long-term barrier breakdown. Do not place any signal traces, vias, or solder pads directly under the package between the input and output pin rows.
The ISO102 dissipates approximately 80 mW from its +/-15 V supplies under typical operating conditions, so thermal management is straightforward and no heatsink is required. However, the hermetic ceramic DIP requires that the case temperature not exceed 150 C; provide a small copper land pattern on the PCB to spread the heat and improve soldering reliability. Estimated: at 80 mW and a typical theta_JA of 60 C/W for a 24-pin DIP, the junction temperature rise is about 5 C above ambient, so thermal shutdown is not a concern even in sealed enclosures.
Clean flux residue thoroughly after soldering the ISO102 because ionic contamination on the ceramic body or leads can degrade the high-voltage isolation barrier over time. Use only no-clean flux if a full cleaning process is not practical, and avoid conformal coating over the package body as the coating can stress the barrier and trap moisture. If a slot or cutout in the PCB is required to route traces under the package, maintain the same 5 mm clearance/creepage rule around the slot edges. Bypass each supply pin with a 100 nF ceramic capacitor placed as close to the pin as possible.
The ISO102 is a bipolar +/-15 V device, not a single-supply isolation amplifier. Connecting a 0-5 V signal directly to the input without biasing the common-mode voltage into the specified range will clip the input and produce no useful output at the isolated side. Add an input bias network and verify that the input common-mode range is respected. If your system is single-supply 3.3 V or 5 V, switch to a single-supply isolation amplifier such as the TI AMC1301, which runs from a single 3.3 V or 5 V supply and provides integrated reinforced isolation.
Información de cumplimiento
Compliance status not stated in the verified datasheet or distributor listings. The part was originally designed by Burr-Brown before RoHS documentation became standard. For RoHS-compliant new designs, consider the TI ISO224 or AMC1301 isolation amplifier family instead.
