ISO121G - ±10V Precision Isolated Amplifier | Texas Instruments
Référence : ISO121G ✗ Fin de vie| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $160.4014 | $160,40 |
| 10 | $160.4014 | $1 604,01 |
| 100 | $160.4014 | $16 040,14 |
| 500 | $160.4014 | $80 200,70 |
| 1 000 | $160.4014 | $160 401,40 |
ISO121G Présentation
An isolated amplifier is a signal-conditioning component that transfers a measured voltage across an electrically isolated barrier while preventing direct conductive coupling between the input and output domains. The ISO121G belongs to the broader isolation-amplifier and instrumentation-amplifier hierarchy: it measures a differential voltage, encodes that measurement through a modulated carrier, reconstructs it on the isolated side, and drives a precision output. This makes it useful where a measurement reference must be separated from the control or processing ground.
The ISO121 datasheet highlights a differential capacitive barrier of 2 pF, user control of carrier frequency, and low nonlinear operation of ±0.01% maximum. The search data also identifies the ISO121 as rated for 3500 Vrms partial-discharge testing, high common-mode transient immunity at 60 Hz, and bipolar input operation across a stated 0.3-wide range in the source summary. Exact operating limits, gain settings, supply-current values, and timing parameters must be taken from the complete manufacturer datasheet rather than inferred from search snippets.
The ISO121G is suited to industrial voltage monitoring, isolated process-control interfaces, power-converter feedback, instrumentation, and test systems. The device is a through-hole 16-CDIP part, so its mechanical footprint is appropriate for conventional through-hole PCB layouts rather than compact surface-mount assemblies. The isolated barrier and precision signal path should be treated as a complete analog-measurement subsystem, with attention to input common-mode range, supply sequencing, isolation creepage and clearance, decoupling, grounding, and output loading.
The key design consideration is that isolation does not remove the need for careful analog layout. Keep input traces short, place supply and bypass capacitors near their associated pins, maintain the required barrier spacing, and avoid routing sensitive input nets beneath or beside isolation-related structures. Confirm the complete datasheet limits before selecting resistor values, carrier frequency, output filtering, or external protection components. This page combines distributor availability, manufacturer references, and engineering guidance to support initial design review rather than replacing the official datasheet.
This page also provides procurement context and selection guidance for engineers comparing ISO121G with related isolation-amplifier options. Available distributor pricing and stock can change, so confirm current pricing, lifecycle status, and exact package details before committing a production BOM.
Alternatives de remplacement direct pour ISO121G — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec ISO121G (même facteur de forme et même empreinte) — différant par Carrier Frequency, Product Type, Package, Nonlinearity, Isolation Barrier.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ISO121BG
✅ Remplacement direct✓ En stock
$19.2 / unité
Voir la fiche technique →ISO120BG
✅ Remplacement direct✓ En stock
Contactez-nous pour le prix
Voir la fiche technique →ISO120SG
✅ Remplacement direct✓ En stock
$471.7929 / unité
Voir la fiche technique →ISO121G Valeurs maximales et caractéristiques électriques
| Product Type | Precision isolated amplifier |
| Input Signal Range | ±10 V |
| Isolation Rating | 3500 Vrms partial-discharge tested |
| Differential Capacitive Barrier | 2 pF |
| Nonlinearity | ±0.01% maximum |
| Input Operation | Bipolar operation |
| Carrier Frequency | User controlled |
| Common-Mode Transient Immunity | High at 60 Hz; quantitative value not provided |
| Amplifier Circuit Count | 1 circuit |
| Boîtier | 16-CDIP |
| Type de montage | Through-hole |
| Nombre de broches | 16 pins |
| AEC-Q100 Qualification | Not specified in verified data |
Guide de configuration des broches du ISO121G 16-cdip
Configuration des broches du ISO121G (boîtier 16-cdip). Ce composant analogique comporte des broches d'entrée, de sortie et d'alimentation. Consultez la fiche technique du fabricant pour les configurations des broches d'annulation d'offset, de compensation et d'activation. Idéal pour le conditionnement de signaux et les circuits amplificateurs.
Aucune donnée de brochage détaillée disponible pour ISO121G.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
ISO121G convient pour 6 applications: Isolated Industrial Voltage Sensing, Power-Converter Feedback, Instrumentation and Signal Conditioning, Test and Measurement Systems, Isolated Process-Control Interface, Isolated Data Acquisition.
Isolated Industrial Voltage Sensing
The ISO121G fits isolated voltage sensing when the sensed signal is within its verified ±10 V input range and the measurement system must be separated from the control or processing ground. Its precision isolated-amplifier architecture is intended to preserve measurement integrity across a barrier, while the 3500 Vrms partial-discharge-tested isolation specification provides a useful basis for high-voltage design review. The circuit should include local input conditioning, supply decoupling, and output filtering selected from the complete manufacturer datasheet.
Recommandé
Power-Converter Feedback
Use ISO121G in power-converter feedback when the feedback voltage falls within the verified ±10 V range and galvanic isolation is required between the power stage and control circuitry. The device’s duty-cycle modulation-demodulation architecture transfers the measurement across the 2 pF differential capacitive barrier, reducing dependence on analog barrier transmission. Designers should account for propagation behavior, carrier-frequency selection, output settling, and the complete electrical limits before closing a power-control loop.
Recommandé
Instrumentation and Signal Conditioning
ISO121G is suitable for instrumentation front ends that must measure bipolar voltages while maintaining an isolated signal path. The verified datasheet summary identifies low nonlinearity of ±0.01% maximum and bipolar operation, making the device relevant to precision measurement rather than ordinary high-voltage switching. Use it with stable supplies, well-defined grounding, input protection, and output buffering as required by the measurement bandwidth and calibration plan.
Recommandé
Test and Measurement Systems
The ISO121G can be used in isolated test fixtures and measurement systems where the input source must remain electrically separated from the instrument ground. Its ±10 V input range covers many external analog measurement signals, and the barrier architecture supports robust signal transfer when common-mode transients are present. Calibration should account for the complete gain, offset, bandwidth, and temperature specifications from the official data, which are not fully exposed in the supplied search snippets.
Recommandé
Isolated Process-Control Interface
ISO121G supports process-control interfaces that need a bipolar voltage transferred across an isolation barrier before conversion or control. Its precision isolation architecture is appropriate when the process ground and controller ground must remain separate, and its verified 3500 Vrms partial-discharge testing is relevant to barrier validation. The implementation must still address isolation creepage, clearance, surge protection, input filtering, and output settling according to the application’s safety and measurement requirements.
Recommandé
Isolated Data Acquisition
ISO121G can be placed between a bipolar sensor or divider network and an isolated data-acquisition front end. The ±10 V input specification gives the analog path a defined signal range, while low nonlinearity and user-controlled carrier frequency support measurement-system planning. Keep the input network close to the device, use low-noise grounding, and confirm output compatibility with the following ADC before layout is released. The complete TI datasheet remains the authority for gain, bandwidth, and timing calculations.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ISO121G — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ISO121BG | ISO120BG | ISO120SG |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 16-CDIP | 16-CDIP | 16-CDIP | 16-CDIP |
| Isolation Architecture | Duty-cycle modulation-demodulation | ISO121-family precision isolation amplifier | ISO120-family precision isolation amplifier | ISO120-family precision isolation amplifier |
Principaux différenciateurs
- Verified ISO121-family input range (vs ISO120BG)
- Higher partial-discharge test rating in the supplied family summary (vs ISO120BG)
- Precision low-cost isolated measurement positioning (vs ISO120SG)
Notes de conception
Treat the isolation barrier as a layout-controlled region. Preserve the manufacturer-specified creepage and clearance between input-side and output-side copper, avoid placing high-voltage or fast-switching traces beneath the barrier, and keep the input return path physically associated with the isolated input domain. The supplied snippets do not provide PCB dimensions or pad geometry, so use the official TI package drawing and application guidance for the final layout.
Keep the ±10 V input network close to ISO121G and minimize loop area before the first filtering or protection node. Place input protection, divider components, and any anti-alias filter according to the signal bandwidth and source impedance rather than only its DC voltage. The verified datasheet summary identifies user-controlled carrier frequency, so carrier selection and filtering must be evaluated together with settling time and required measurement accuracy.
Verify supply voltage, supply-current, sequencing, and output-loading requirements directly from the complete ISO121G datasheet before designing the power rails. Add local decoupling close to the device pins and account for the current drawn by both isolated domains. Because the supplied data does not state the supply range or quiescent current, do not select regulators or bulk capacitors from search-result information alone.
Informations de conformité
The supplied product and distributor snippets do not provide verified RoHS, REACH, lead-free, halogen-free, conflict-minerals, or AEC-Q100 statements. ISO121G is an analog isolation amplifier, so AEC-Q100 is recorded as not applicable rather than inferred.
