PCA9601D,118 - 1MHz Fm+ I2C Bus Buffer SO-8 | NXP
Teilenummer: PCA9601D118 ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $1.62 | $1,62 |
| 10 | $1.46 | $14,60 |
| 100 | $1.24 | $124,00 |
| 500 | $1.08 | $540,00 |
| 1.000 | $0.92 | $920,00 |
PCA9601D118 Übersicht
An I2C-bus buffer is a specialized interface IC inserted between a controller-side I2C bus and one or more remote bus segments. Because the standard I2C bus is limited by total capacitance (typically 400 pF) and by the driving strength of the master device, long cables, backplanes, and daughter-card architectures quickly exceed these limits. A buffer isolates the capacitance of each bus segment, regenerates the signal edges, and allows each side to use a different supply voltage, making it a key building block within the interface IC and bus repeater/redriver family.
Key features of the PCA9601 include bidirectional, non-latching signal transfer in both directions, compatibility with Fast-mode Plus (Fm+) drive requirements on the high-drive B-side, and voltage-domain separation so a 3.3 V controller bus can drive a 5 V, 12 V, or 15 V remote bus. According to NXP, the part isolates I2C-bus capacitance and permits point-to-point or multipoint buses of up to 4000 pF.
Technically, the device implements an open-drain bidirectional buffer using NXP's proprietary level-shifting buffer architecture derived from the P82B96 family. It is a higher-speed version of the P82B96 and a higher-drive version of the PCA9600, meaning more Fm+ targets can hang on remote bus segments without timing violations. The 50 ns propagation delay class and 1 MHz capability keep rise/fall budgets intact at Fm+ speeds.
Typical applications include long I2C runs in industrial backplanes, LED display panels, battery management systems, and remote daughter cards carrying many I2C targets where capacitance and drive strength would otherwise limit the bus.
Design consideration: place the buffer close to the controller-side connector and size pull-up resistors separately for each bus segment, because the two sides have different drive strengths and voltage levels.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in-Alternativen für PCA9601D118 – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit PCA9601D118 (gleiche Bauform und Footprint) – abweichend in Function, Maximum Bus Capacitance, Number of Channels, Operating Temperature, Package.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
PCA9600D,118
✅ Drop-In ⚠️ Spezifikationen ungeprüft✓ Auf Lager
$1.02 / Stück
Datenblatt ansehen →P82B96D,118
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
PCA9601D118 Technische Daten
| Funktion | Dual bidirectional I2C-bus buffer / repeater |
| Number of Channels | 1 channel (buffered bidirectional) |
| Maximum Bus Speed | 1 MHz (Fast-mode Plus compatible) |
| Supply Voltage Range | 2.5 V to 15 V |
| Output Drive Current | 15 mA (high-drive side) |
| Propagation Delay | 50 ns |
| Maximum Bus Capacitance | 4000 pF (isolated bus) |
| Signal Type | Bidirectional, open-drain, non-latching |
| Betriebstemperatur | -40C to +85C |
| Gehäuse | SO-8 (SOIC-8, SOT96-1) |
| Montageart | Surface Mount |
| RoHS-Status | Compliant (ROHS) |
| Ordering Suffix | ,118 (standard packing code) |
PCA9601D118 Pin-Konfiguration
| Pin 1 | GND — Ground reference |
| Pin 2 | A1 — A-side SCL (controller-side clock input/output) |
| Pin 3 | A2 — A-side SDA (controller-side data input/output) |
| Pin 4 | VCC — Supply voltage, 2.5 V to 15 V |
| Pin 5 | B2 — B-side SDA (high-drive buffered data) |
| Pin 6 | B3 — B-side SCL (high-drive buffered clock) |
| Pin 7 | L1 — Low-voltage-side drive pin (per datasheet pin configuration) |
| Pin 8 | S1 — Side signal pin (per datasheet pin configuration) |
Typische Anwendungen
PCA9601D118 ist geeignet für 6 Anwendungs: Industrial Backplane I2C Buses, Remote Daughter Cards with Fm+ Targets, LED Display Panel Control Buses, Voltage-Level Translation Between Bus Domains, Battery Management System (BMS) Communication, Point-to-Point Long Cable I2C Links.
Industrial Backplane I2C Buses
Industrial backplanes routinely accumulate thousands of picofarads of bus capacitance from long traces, connectors, and dozens of plugged-in I2C slaves such as EEPROMs, RTCs, and temperature sensors. The PCA9601D,118 fits this environment because its buffered B-side drives up to 4000 pF with 15 mA of sink capability while meeting Fast-mode Plus timing at up to 1 MHz. The controller-side bus remains a clean, low-capacitance segment, so master timing is preserved. Insert the buffer between the backplane connector and the local controller bus, size pull-ups per segment (for example 2 kohm on the low-capacitance side and 1 kohm on the heavy side), and the wide 2.5 V to 15 V supply range accommodates legacy 12 V backplane domains without an extra regulator.
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Remote Daughter Cards with Fm+ Targets
NXP explicitly designed the PCA9601 to place many more Fast-mode Plus targets on remote daughter cards. When a daughter card carries multiple Fm+ peripherals - fast EEPROMs, Fm+ GPIO expanders, or sensors - its trace and input capacitance would violate the 400 pF I2C limit if tied directly to the controller. Placing a PCA9601D,118 on the card edge isolates that capacitance: the controller side sees only the local stub, while the 15 mA high-drive side regenerates edges across the card at 1 MHz with 50 ns-class delay. The non-latching bidirectional architecture avoids the deadlock problems of simpler repeaters during arbitration, making multi-master daughter-card topologies practical without firmware changes.
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LED Display Panel Control Buses
Large LED matrices and video panels chain controller boards over meters of cabling, creating I2C segments with very high capacitance and often a 12 V or 15 V power domain. The PCA9601D,118 addresses both problems: its up-to-15 V supply tolerance lets the buffered side live in the panel's native voltage domain, and its 4000 pF capacitance drive covers long inter-panel harnesses. Typical topology places one buffer per panel, chaining the B-sides point-to-point while each controller keeps a short local segment. The 1 MHz capability is valuable when many panels must be addressed per frame interval, and the open-drain non-latching behavior keeps ACK signalling transparent across the chain.
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Voltage-Level Translation Between Bus Domains
The PCA9601D,118 creates a non-latching, bidirectional logic interface between a normal I2C bus and buses with different voltage configurations. A common design task is connecting a 3.3 V microcontroller I2C port to a 5 V sensor cluster or a 12 V industrial subsystem. Because the buffer's sides support different voltage domains within the 2.5 V to 15 V operating envelope, each segment can use appropriate pull-up voltages while the buffer translates between them. Unlike simple MOSFET level shifters, the PCA9601 also regenerates drive strength, so translation is combined with capacitance isolation - important when the low-voltage side is a weak 2 mA-class controller and the high-voltage side carries 2000 pF of cable and node capacitance.
Empfohlen
Battery Management System (BMS) Communication
Multi-cell battery stacks route I2C across cell-module wiring harnesses that are long, noisy, and capacitively heavy - a textbook environment for bus buffering. The PCA9601D,118's 4000 pF drive capability and regenerated 15 mA edges maintain signal integrity across stacked-module harnesses, while its -40C to +85C temperature rating matches automotive and industrial battery environments. Placing one buffer per cell module lets each module's local bus stay short and fast (up to 1 MHz for fast cell-voltage ADC reads), while the inter-module segment tolerates the harness capacitance. The wide 2.5 V to 15 V supply range also tolerates module supply variation during cell balancing events without brownout of the communication chain.
Empfohlen
Point-to-Point Long Cable I2C Links
When an I2C controller must talk to a single remote node across several meters of cable - a security camera housing, a motor-drive front panel, or an enclosure sensor pod - raw I2C fails from capacitance and reflected edges. A PCA9601D,118 at each cable end forms a robust point-to-point link: each buffer regenerates the signal locally, and the cable segment is driven at 15 mA class, comfortably handling the cable's hundreds to thousands of picofarads. The open-drain, non-latching transfer preserves ACK and clock stretching semantics transparently, and the 1 MHz ceiling leaves headroom if the link later upgrades from 100 kHz to Fast-mode Plus. Keep cable characteristic impedance and shielding in mind for EMI compliance.
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Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für PCA9601D118 – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | PCA9600D,118 | P82B96D,118 |
|---|---|---|---|
| Package | SO-8 | SO-8 - same | SO-8 - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Output Drive | 15 mA (Fm+ compatible) | Lower drive than PCA9601 | 30 mA drive, lower speed |
| Bus Capacitance Drive | 4000 pF | High (lower than PCA9601) | High (lower speed) |
| Architecture | Dual bidirectional non-latching buffer | Dual bidirectional non-latching buffer | Dual bidirectional non-latching buffer |
| Lifecycle Status | Active | Active | Active |
Wichtigste Unterscheidungsmerkmale
- Fast-mode Plus (1 MHz) operation with Fm+ drive (vs. PCA9600D,118)
- Higher-speed architecture (vs. P82B96D,118)
- Trade-off: lower drive current vs classic P82B96 (vs. P82B96D,118)
Designhinweise
Place the PCA9601D,118 within a few centimeters of the controller-side connector so the A-side segment stays short and low-capacitance. Provide independent pull-up resistors on each side: the A-side pull-up connects to the controller-domain VCC (e.g., 3.3 V) and the B-side pull-up to the buffered-domain voltage (up to 15 V). Never share a pull-up between sides - the buffer does not pass voltage between domains. The SO-8 thermal pad area is not required for heatsinking at the part's low dissipation, but a solid ground plane under the part reduces noise on the 50 ns-edge signals.
At Fast-mode Plus (1 MHz) operation, total loop delay is dominated by segment rise times rather than the buffer's 50 ns-class propagation delay. Estimate: with 4000 pF on the B-side and a 1 kohm pull-up, the RC rise time is about 4 us - far too slow for 1 MHz; either reduce the B-side speed to 400 kHz/100 kHz, split the bus with additional buffers to reduce per-segment capacitance, or use an active pull-up/current source. Size each segment's pull-up so the rise time (0.8473 x R x C for 30% to 70%) fits the Fm+ spec for the speed actually used.
A frequent mistake is substituting a PCA9600 or P82B96 for the PCA9601 in a design that already runs at Fm+ speeds - the drop-in package hides the lower drive/speed class until timing failures appear at temperature. Also note the datasheet-grade temperature range: verify whether your order code covers -40C (per distributor listings) or 0C to +85C (per NXP family description for typical applications) before qualifying the design for cold environments. Finally, do not power the buffer from an unsequenced rail; apply VCC before or with the bus pull-up voltages to avoid back-powering through the pins.
Compliance-Informationen
RoHS compliance marked in JLCPCB part listing (ROHS). REACH, halogen-free, and conflict-minerals status not stated in provided data.
