SI8901B-A01-GS - 10-bit Isolated I2C ADC, 2.5kV | Skyworks
Référence : SI8901B-A01-GS ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $2.73 | $2,73 |
| 10 | $2.55 | $25,50 |
| 100 | $2.2 | $220,00 |
| 500 | $1.95 | $975,00 |
| 1 000 | $1.72 | $1 720,00 |
SI8901B-A01-GS Présentation
An isolated ADC (analog-to-digital converter) is a data-conversion IC that combines a traditional SAR ADC with an integrated digital isolator, replacing discrete optocouplers or digital isolators plus an external ADC. The isolation barrier provides safety-grade galvanic separation between a high-voltage analog domain (such as a 480 VAC mains monitor or a solar-inverter current shunt) and a low-voltage logic domain (such as a 3.3 V MCU). Compared with discrete solutions, an integrated isolated ADC reduces BOM count, eliminates timing-skew between ADC sampling and isolation, and provides certified isolation ratings rather than relying on custom PCB creepage/clearance calculations. The SI8900/1/2 family further extends this concept to UART (Si8900), I2C/SMbus (Si8901), and SPI (Si8902) host interfaces.
Key features include 2.5 kV RMS isolation per UL1577 and VDE/IEC 60747-5-2, 10-bit resolution, three single-ended input channels with on-chip MUX and PGA, internal or external voltage reference, and an I2C/SMbus serial interface. The device operates from a 2.7 V to 5.5 V analog supply and a 3.0 V to 5.5 V digital supply, and includes a built-in supervisory state machine for autonomous monitoring. The wide-body SOIC-16 package provides the creepage and clearance required to sustain the rated isolation voltage.
Typical applications include isolated data-acquisition front ends, AC mains monitors for energy meters, solar-inverter string monitoring, industrial process-control analog inputs, and any high-side current/voltage sensing that must remain galvanically isolated from the host controller. The I2C interface simplifies connection to virtually any modern MCU without dedicated SPI or UART peripherals.
When designing with this part, place 0.1 µF decoupling capacitors close to both the analog (VDDA) and digital (VDDD) supply pins and respect the minimum 8 mm creepage distance on the PCB under the SOIC-16W body. The PGA gain must be configured before ADC conversion starts, and the internal reference is enabled by default; for highest absolute accuracy, an external precision reference may be substituted. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone Skyworks datasheet.
Alternatives de remplacement direct pour SI8901B-A01-GS — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
SI8901B-A01-GSR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SI8900B-A01-GS
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SI8902B-A01-GS
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SI8901B-A01-GS Valeurs maximales et caractéristiques électriques
| Manufacturer | Skyworks Solutions Inc. (formerly Silicon Labs) |
| Part Number | SI8901B-A01-GS |
| Fonction | Isolated monitoring ADC |
| Résolution | 10 bit |
| Architecture | SAR (Successive Approximation) |
| Number of ADC Channels | 1 |
| Number of Analog Inputs | 3 (single-ended, multiplexed) |
| Input Type | Single Ended |
| Data Interface | I2C / SMbus |
| Front End | MUX-PGA-ADC |
| Reference Type | External or Internal (selectable) |
| Analog Supply Voltage | 2.7 V to 5.5 V |
| Digital Supply Voltage | 3.0 V to 5.5 V |
| Isolation Voltage | 2.5 kV RMS (UL1577, VDE/IEC 60747-5-2) |
| Approvals | CSA 5A, IEC 61010, IEC 60601, UL1577, VDE/IEC 60747-5-2 |
| Boîtier | 16-SOIC (wide-body SOIC-16W) |
| Type de montage | Surface Mount |
| Statut RoHS | Compliant (per FindIC datasheet listing) |
Configuration des broches de SI8901B-A01-GS
| Broche 1 | VDDA — Analog high-side supply (2.7 V to 5.5 V) |
| Broche 2 | GNDA — Analog high-side ground |
| Broche 3 | AIN0 — Analog input channel 0 (single-ended) |
| Broche 4 | AIN1 — Analog input channel 1 (single-ended) |
| Broche 5 | AIN2 — Analog input channel 2 (single-ended) |
| Broche 6 | REFin/REFout — External reference input or internal reference output |
| Broche 7 | AGND — Analog high-side ground reference |
| Broche 8 | NC — Not connected (per datasheet) |
| Broche 9 | GNDD — Digital low-side ground |
| Broche 10 | VDDD — Digital low-side supply (3.0 V to 5.5 V) |
| Broche 11 | SCL — I2C/SMbus serial clock |
| Broche 12 | SDA — I2C/SMbus serial data |
| Broche 13 | ADDR — I2C slave address select |
| Broche 14 | INT — Interrupt output (active low) |
| Broche 15 | RST — Reset input (active low) |
| Broche 16 | NC — Not connected (per datasheet) |
Applications typiques
SI8901B-A01-GS convient pour 6 applications: AC Mains Monitor for Energy Meters, Solar Inverter String Monitoring, Isolated Industrial Data Acquisition, Medical Equipment Patient-Isolation Barrier, Power-Delivery System Telemetry, Ground-Loop Elimination in Test & Measurement.
AC Mains Monitor for Energy Meters
The SI8901B-A01-GS fits AC mains monitoring in single-phase and polyphase energy meters because its 2.5 kV RMS isolation barrier (UL1577 and VDE/IEC 60747-5-2 certified) safely separates the 230/480 VAC analog domain from the low-voltage MCU and metrology domain. The integrated 10-bit SAR ADC samples three single-ended inputs from voltage dividers and current shunts through the on-chip MUX-PGA, eliminating the external op-amp plus optocoupler chain used in legacy designs. Compared with a discrete ADC plus digital isolator, the SI8901B reduces BOM count and timing skew while delivering a CSA 5A-approved isolation rating that meets IEC 61010 and IEC 60601-style creepage requirements. Designers should keep the analog trace length under 10 mm and respect the SOIC-16W minimum 8 mm creepage to preserve certification.
Recommandé
Solar Inverter String Monitoring
The SI8901B-A01-GS is one of the headline applications in the Skyworks datasheet and is well suited for solar-inverter string monitoring, where each photovoltaic string must be measured at DC bus voltages up to 1000 V while the inverter controller MCU sits on a low-voltage, safety-isolated domain. The 2.5 kV isolation rating provides the reinforced isolation required between the high-side string-voltage divider and the host MCU, while the integrated 3-channel MUX-PGA-ADC digitizes string voltage, string current, and temperature with one IC. The I2C/SMbus interface lets the inverter MCU poll up to multiple isolated ADCs on a shared 2-wire bus, simplifying harness routing inside the inverter. Use the internal reference for cost-optimized monitoring strings, or an external precision reference for highest-accuracy string-current measurements used in MPPT feedback loops.
Recommandé
Isolated Industrial Data Acquisition
The SI8901B-A01-GS is well matched to isolated industrial data-acquisition front ends that read 4-20 mA loop currents, RTD outputs, or thermocouple signals from a high-side analog domain and deliver digitized readings to a factory-floor MCU over an I2C bus. The 2.5 kV RMS isolation protects the controller from ground loops and transient events on the industrial bus, while the integrated PGA provides gain for low-level sensor signals before the 10-bit SAR ADC samples them. Compared with a discrete isolation amplifier plus external ADC solution, the SI8901B reduces PCB area and eliminates the need for an isolated power supply on the sensor side when the host side powers the digital domain. IEC 61010 certification simplifies compliance for industrial control equipment.
Recommandé
Medical Equipment Patient-Isolation Barrier
The SI8901B-A01-GS supports medical equipment patient-isolation barriers where IEC 60601-style isolation is required between patient-connected analog sensors and the host monitoring electronics. Its VDE/IEC 60747-5-2 and IEC 60601 component notices, combined with 2.5 kV RMS reinforced isolation, allow designers to build patient-leakage-current-compliant analog input modules without a discrete isolation amplifier chain. The integrated 10-bit ADC provides sufficient resolution for vital-sign monitoring front ends such as pulse oximetry current sensing or ECG lead-off detection, while the I2C interface reduces the host-side pin count versus SPI or UART alternatives. For higher-resolution patient monitoring (12-bit or 16-bit ECG), pair the SI8901B with a follow-on precision ADC on the host side.
Recommandé
Power-Delivery System Telemetry
The SI8901B-A01-GS is well suited to power-delivery system telemetry, where bus voltages and currents on high-voltage DC rails (48 V telecom buses, 380 V HVDC distribution, or 800 V EV traction buses) must be digitized and reported to a low-voltage controller over an isolated interface. The 2.5 kV isolation barrier eliminates the need for an external digital isolator plus isolated power supply on the high-side domain, while the 3-channel input MUX lets one IC report three telemetry points (rail voltage, rail current, temperature) per monitored rail. The I2C/SMbus interface allows multiple SI8901B devices to share a single 2-wire bus, simplifying harness routing across multi-rail power shelves. Use the internal reference for cost-optimized telemetry and an external precision reference for highest-accuracy current sensing in closed-loop control.
Recommandé
Ground-Loop Elimination in Test & Measurement
The SI8901B-A01-GS is well matched to test and measurement front ends where ground loops between a floating sensor (such as a current probe or high-side shunt) and the bench oscilloscope or data logger would otherwise inject measurement error. Its 2.5 kV RMS isolation breaks the ground loop entirely, while the integrated 10-bit SAR ADC and PGA condition and digitize the sensor signal before transmission over I2C to the bench instrument. Compared with discrete analog isolation amplifiers, the SI8901B provides tighter timing correlation between ADC sampling and isolation, improving phase-noise and harmonic-distortion measurements on power-electronics waveforms. Designers should reserve at least 8 mm PCB creepage under the SOIC-16W body and add a guard trace tied to the analog-side ground to preserve isolation under humidity.
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Récapitulatif des produits recommandés
Données de référence d'ingénierie pour SI8901B-A01-GS — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | SI8901B-A01-GSR | SI8900B-A01-GS | SI8902B-A01-GS |
|---|---|---|---|---|
| Package | SOIC-16W (wide-body) | SOIC-16W (wide-body) - same | SOIC-16W (wide-body) - same | SOIC-16W (wide-body) - same |
| Brand | Skyworks Solutions | Skyworks Solutions - same | Skyworks Solutions - same | Skyworks Solutions - same |
| Resolution | 10 bit | 10 bit | 10 bit | 10 bit |
| Host Interface | I2C / SMbus | I2C / SMbus | UART | SPI |
| Number of Analog Inputs | 3 single-ended | 3 single-ended | 3 single-ended | 3 single-ended |
| Isolation Voltage | 2.5 kV RMS | 2.5 kV RMS | 2.5 kV RMS | 2.5 kV RMS |
| Analog Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Digital Supply Voltage | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V |
| Reference Type | Internal or External | Internal or External | Internal or External | Internal or External |
Principaux différenciateurs
- Integrated 2.5 kV isolation barrier plus 10-bit ADC plus MUX-PGA in a single IC (vs Discrete isolation amplifier + external 10-bit ADC + optocoupler chain)
- Pin-compatible family covers UART, I2C, and SPI host interfaces (vs Single-interface competitors with no family option)
- Certified to UL1577, VDE/IEC 60747-5-2, IEC 61010, IEC 60601, and CSA 5A (vs Competitors certified to only UL1577 or VDE basic isolation)
Notes de conception
The wide-body SOIC-16W package must be laid out with a minimum 8 mm of creepage distance between the analog (high-side) and digital (low-side) pins on the PCB top layer to preserve the 2.5 kV isolation rating. Do not run any digital-side traces, vias, or copper pours under the package body, and avoid soldermask-only openings that would reduce surface creepage under humidity. A guard trace tied to the analog-side ground, routed between the high-side copper and the package body, further improves performance in humid or polluted environments.
Place 0.1 uF X7R ceramic decoupling capacitors within 2 mm of the VDDA (pin 1) and VDDD (pin 10) supply pins, with a 10 uF bulk capacitor on each rail near the IC. The two supplies are isolated from each other internally, so each requires a local decoupling network; sharing a bulk capacitor across the isolation barrier violates creepage and degrades ADC noise performance. Power-up sequencing is not required because both rails can be brought up in any order.
Route the analog input traces (AIN0-AIN2) as differential pairs with the analog ground GNDA, keep them under 10 mm, and avoid running them parallel to digital I2C traces (SCL, SDA) on adjacent layers. The on-chip MUX-PGA-ADC front end samples each input in turn; for best 10-bit accuracy, allow at least 1 us settling time after switching channels before starting a conversion. The internal reference (REFout) should be bypassed with a 0.1 uF capacitor to AGND; if an external reference is used, drive REFin from a low-noise, low-drift source such as a 2.5 V REF3025.
Do not exceed the maximum analog input voltage of VDDA + 0.3 V on any AINx pin, or the input ESD diodes will forward-conduct and corrupt the conversion result. The I2C slave address is set by the ADDR pin; leaving it floating selects the default address, while tying it to VDDD or GND selects alternate addresses - consult the Si8900/1/2 datasheet for the exact address map when sharing the bus with multiple isolated ADCs. The RST pin must be held low for at least 1 us after VDDD stabilizes to guarantee a clean start-up.
Informations de conformité
RoHS compliance and lead-free confirmed by FindIC datasheet listing; AEC-Q100 not applicable to this isolated ADC (intended for industrial, energy, and medical isolation use, not automotive). Component-level safety certifications: UL1577, VDE/IEC 60747-5-2, IEC 61010, IEC 60601, CSA 5A per Si8900/1/2 datasheet and DigChip feature listing.
