PCA9614DP - 2ch Differential I2C Bus Buffer | NXP
MPN: PCA9614DP ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.56 | $25.60 |
| 100 | $2.14 | $214.00 |
| 500 | $1.78 | $890.00 |
| 1,000 | $1.49 | $1,490.00 |
PCA9614DP Overview
A differential I2C-bus buffer, sometimes called a dI2C buffer or bus repeater, is an interface IC that converts the single-ended SDA (serial data) and SCL (serial clock) signals of a conventional I2C or SMBus into differential signal pairs. Differential signaling rejects common-mode noise on long cables and across ground offsets, allowing the same I2C protocol transactions to traverse distances and electromagnetic environments where plain I2C wiring would fail. In the interface-IC hierarchy, the PCA9614 belongs to the signal buffer/repeater family, positioned above simple level translators and below full protocol bridges.
Key features include two single-ended-to-differential driver channels for SCL and SDA, full transparency to the SMBus/I2C protocol layer (no protocol awareness or configuration required), multipoint operation that permits multiple buffer nodes on one differential bus, and support for Fast-mode Plus traffic as an active bus buffer and redriver. According to the NXP PCA9614 datasheet, the device consists of two single-ended to differential driver channels for the SCL and SDA lines.
Architecturally, each channel contains a single-ended side connected to the local I2C segment and a differential driver/receiver pair connected to the dI2C cable segment (P and N lines). Because the buffer regenerates drive strength on both sides, it decouples bus capacitance between segments, letting designers add devices or cable length without violating I2C capacitance limits. The dI2C physical layer is fully transparent, so existing I2C masters and slaves need no firmware changes.
Typical applications include industrial sensor networks with long cable runs, remote I2C peripherthe devices in electrically noisy motor-drive cabinets, LED display and lighting control backbones, and server backplane management where SMBus must cross chassis boundaries. In each case the differential layer suppresses ground potential differences and coupled EMI.
A key design consideration is that both ends of a dI2C link require a buffer (for example PCA9614 or the related PCA9615/PCA9617A family members), and the differential pair should be routed as a controlled-impedance twisted pair or tightly coupled PCB traces.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet. Prices shown are as of 2026-10-20.
Drop-in alternatives for PCA9614DP — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PCA9614DP (same form factor and footprint) — differing in Bus Type, Function, Number of Channels, Package, Protocol.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PCA9614DPZ
✅ Drop-In📋 Reference alternative (not in catalog)
PCA9615DPZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.78 / Unit
View Datasheet →PCA9617ADP
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PCA9614DP Specifications
| Function | 2-channel multipoint Fast-mode Plus differential I2C-bus buffer |
| Protocol | SMBus / I2C-bus (dI2C differential physical layer) |
| Number of Channels | 2 (SCL and SDA) |
| Maximum Operating Frequency | 400 kHz |
| Bus Type | Buffer, ReDriver |
| Signaling | Single-ended to differential conversion |
| Protocol Layer Transparency | Transparent to SMBus/I2C protocol layer |
| Package | TSSOP-10 (DP) |
| Mounting Type | Surface Mount |
| Multipoint Support | Yes (multipoint dI2C bus) |
| Typical Applications | Noisy-environment I2C/SMBus extension over cable |
PCA9614DP tssop-10 (dp) Pin Configuration Guide
Pin configuration for PCA9614DP (tssop-10 (dp) package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for PCA9614DP.
Refer to the datasheet for full pin configuration.
Typical Applications
PCA9614DP is suitable for 6 applications: Industrial Sensor Networks, Motor Drive and Power Cabinet Control, LED Display and Lighting Backbones, Server Backplane and Chassis Management, Elevator and Building Automation Wiring, Test and Measurement Instrument Chassis.
Industrial Sensor Networks
Factories routinely need I2C sensors tens of meters from the controller, across cable trays saturated with motor and relay noise. The PCA9614DP fits this application because its differential dI2C physical layer rejects common-mode noise that corrupts single-ended I2C, and its 400 kHz buffer operation keeps response times fast enough for polling dozens of sensors. In use, a PCA9614DP sits at the controller, converting SDA/SCL to differential pairs that run over twisted-pair cable to remote PCA9614DP nodes, each of which regenerates a clean local single-ended I2C segment. The multipoint capability allows several buffer nodes on one cable, so sensor clusters can be tapped along a single trunk. The trade-off is that each node adds a small propagation delay, so at 400 kHz the total bus length and node count should be validated against timing margins in the NXP datasheet.
Recommended
Motor Drive and Power Cabinet Control
PWM-driven inverters create large ground potential differences and extreme EMI, exactly the environment where single-ended I2C fails within a meter of cable. The PCA9614DP is suited here because its differential receivers tolerate ground offsets between the control chassis and power stages, and the buffered differential layer carries clock and data without regenerating noise spikes. Implementation places the PCA9614DP near the controller and a second unit on the inverter board; the dI2C P/N lines are routed as twisted pair or differential traces between them, while all local I2C to gate-driver controllers or current sensors remains conventional single-ended. The buffer transparently passes SMBus/I2C transactions with no firmware changes. Engineers should ensure the differential pair maintains controlled impedance and keep stubs to local devices short to preserve 400 kHz timing margins.
Recommended
LED Display and Lighting Backbones
Large LED walls and architectural lighting systems spread I2C-controlled driver ICs across panels separated by meters of harness. The PCA9614DP fits because its multipoint differential bus lets one controller trunk serve many panels: each panel carries a PCA9614DP that taps the dI2C cable and recreates a clean local I2C segment for the LED driver chips. Its 400 kHz operation supports the frame refresh rates of typical display update cycles, and protocol transparency means existing panel firmware is untouched. Differential signaling also rejects the switching noise generated by the LED drivers themselves, which frequently corrupts single-ended I2C on shared harnesses. The design consideration is per-node propagation delay at high refresh rates, and the requirement that the differential pair avoid running parallel to high-dv/dt LED power lines to keep coupling within the receiver common-mode range.
Recommended
Server Backplane and Chassis Management
Server and storage systems use SMBus for PSU, fan, and temperature monitoring, but SMBus signals crossing between a management blade and the backplane encounter ground shifts and connector stubs. The PCA9614DP addresses this by converting the management SMBus into a differential dI2C pair across the backplane connector, rejecting the noise coupling typical of high-current 12V rails running alongside. Because it is transparent to the SMBus/I2C protocol layer, IPMI-style management firmware requires no changes, and the buffer function isolates backplane capacitance from the local segment so BMC-side I2C timing stays valid. In multipoint form, one dI2C trunk can serve multiple shelf monitoring nodes. Designers should budget the differential pair's stub length at each connector and verify the 400 kHz timing across the maximum backplane length during system bring-up.
Recommended
Elevator and Building Automation Wiring
Building automation nodes - door controllers, floor indicators, HVAC sensors - are wired with long runs through shafts where lightning-induced surges, ground differences, and fluorescent/inverter noise are common. The PCA9614DP suits this because differential transmission over the dI2C pair tolerates the ground potential differences between floors that would instantly destroy or corrupt single-ended I2C. Each remote node uses a PCA9614DP to regenerate a robust local I2C segment feeding environmental sensors or I/O expanders, and the multipoint bus allows a single trunk cable to serve many floors, cutting harness cost. At 400 kHz, response latency remains negligible for building control polling cycles. The system should still include TVS protection on the differential pair for surge immunity, and keep the pair away from mains wiring per building-code separation rules.
Recommended
Test and Measurement Instrument Chassis
Modular instruments stack multiple measurement boards in one chassis where each module's switching regulators inject noise onto shared harnesses. The PCA9614DP is a good fit for the internal control bus because it isolates each module's I2C segment from the noisy trunk: the differential dI2C pair between backplane and module ignores the common-mode switching noise, and the buffer regenerates edges so bus capacitance from long backplane traces does not degrade timing. Its 400 kHz operation covers typical configuration and telemetry traffic, and protocol transparency means the same master firmware drives mixed module types without bridges. In multipoint mode the trunk can address all slots on one cable pair. Designers should place the buffer close to the module connector and add standard 100 nF plus bulk decoupling at each VCC pin per the NXP datasheet recommendations.
Recommended
Recommended Products Summary
Engineering reference data for PCA9614DP — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PCA9614DPZ | PCA9615DP | PCA9617ADP |
|---|---|---|---|---|
| Package | TSSOP-10 (DP) | TSSOP-10 (DP) - same | TSSOP-10 (DP) - same | TSSOP-10 (DP) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Topology | Multipoint dI2C bus | Multipoint dI2C bus | Point-to-point dI2C | Hot-pluggable dI2C segment |
| Channels | 2 (SCL, SDA) | 2 (SCL, SDA) | 2 (SCL, SDA) | 2 (SCL, SDA) |
| Protocol Transparency | Yes (I2C/SMBus transparent) | Yes | Yes | Yes |
| Hot-Plug / Isolation Feature | No | No | No | Yes (enable-controlled isolation) |
Key Differentiators
- True multipoint multi-drop differential bus (vs PCA9615DP)
- Lower cost, simpler system for non-hot-plug links (vs PCA9617ADP)
- Lead-free sourcing flexibility via PCA9614DPZ (vs PCA9614DPZ)
Design Notes
Route the dI2C differential P/N pairs as a tightly coupled twisted pair (cable) or 100-ohm differential PCB traces. Keep every single-ended I2C stub at each buffer node as short as possible - ideally under 10 cm - because stubs add capacitance to the local segment and erode Fast-mode timing margins. Avoid routing the differential pair parallel to high-dv/dt lines such as LED power rails or motor phase outputs; even though the receiver rejects common-mode noise, excessive coupled differential-mode noise can still violate the receiver threshold budget described in the NXP PCA9614 datasheet.
A dI2C link requires a differential buffer at BOTH ends - the PCA9614DP at the master side and another at the far node. A single-ended I2C device wired directly onto the differential P/N lines will not communicate and may be damaged. Also verify that every node on a multipoint bus is a multipoint-capable part (PCA9614, not a point-to-point variant); mixing topologies can cause bus contention on the differential pair. Finally, confirm the exact maximum data rate for your supply voltage and temperature in the datasheet, since the distributor 400 kHz figure should be validated against your timing conditions.
Place 100 nF ceramic decoupling capacitors within 2-3 mm of each VCC pin on both the A-side and B-side supply domains, with a 4.7-10 uF bulk capacitor per board, as standard NXP interface-IC layout practice. If the part supports separate A-side and B-side grounds or supplies, join them at a single star point near the IC to minimize ground loop current through the buffer. Provide accessible test points on the single-ended SDA/SCL side rather than on the fast differential pairs, since probing differential lines disturbs them; this simplifies bring-up debugging on the local I2C segment.
When several PCA9614DP nodes share one multipoint cable, treat the topology as a linear daisy chain or short stubs from a trunk rather than a long star, mirroring standard differential-bus (RS-485 style) wiring discipline. Equal-length differential routing on the PCB preserves skew balance; length-match the P and N traces within a few millimeters. Where the dI2C pair crosses chassis boundaries, consider common-mode choke or TVS diodes rated for the environment - a recommended practice for industrial and building-automation installations subject to surge events.
Compliance Information
The retrieved web data did not include explicit RoHS/REACH statements for the PCA9614DP. The lead-free Z-suffix variant (PCA9614DPZ) is stocked at DigiKey; consult the NXP product page environmental quality section for definitive compliance data.
