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PCA9544ADW
Texas Instruments
IC INTERFACE SPECIALIZED 20SOIC
65805 Pcs New Original In Stock
Translating Switch Interface 20-SOIC
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5.0 / 5.0
- (45 Ratings)
PCA9544ADW
Product Overview
1740407
DiGi Electronics Part Number
PCA9544ADW-DGManufacturer
Texas Instruments
PCA9544ADW
Description
IC INTERFACE SPECIALIZED 20SOICInventory
65805 Pcs New Original In Stock
Translating Switch Interface 20-SOIC
Quantity
Minimum 1
Minimum 1
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PCA9544ADW Technical Specifications
Category
Interface, Specialized
Packaging
Tube
Series
-
Product Status
Last Time Buy
Applications
Translating Switch
Interface
I2C, SMBus
Voltage - Supply
2.3V ~ 5.5V
Package / Case
20-SOIC (0.295", 7.50mm Width)
Supplier Device Package
20-SOIC
Mounting Type
Surface Mount
Base Product Number
PCA9544
Datasheet & Documents
HTML Datasheet
PCA9544ADW-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
PCA9544ADW-DG
PCA9544ADWG4
PCA9544ADWG4-DG
2156-PCA9544ADW
TEXTISPCA9544ADW
296-33502-5
Standard Package
25
Alternative Parts
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MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
December 02, 2025
長期間使用していますが、製品の品質は一貫して高いままです。スタッフもとても親切です。
December 02, 2025
Their products show a high level of quality, making them trustworthy and dependable.
December 02, 2025
The company's prices make high-quality technology accessible to more people.
December 02, 2025
DiGi Electronics consistently delivers reliable products that meet our business needs.
December 02, 2025
The site prioritizes user safety, with visible security badges and encrypted pages.
December 02, 2025
Customer support was patient and helpful even when I had multiple questions.
December 02, 2025
Their quick dispatch process truly speeds up my projects—highly reliable.
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Frequently Asked Questions (FAQ)
Can the PCA9544ADW be safely used in a mixed-voltage I2C system where one downstream device operates at 1.8V and others at 3.3V, given its translating switch functionality?
The PCA9544ADW supports voltage translation between its upstream and downstream channels, but it does not actively level-shift signals—it relies on pull-up resistors tied to the respective supply voltages of each segment. For reliable operation with a 1.8V device, ensure that the downstream pull-ups are connected to 1.8V and the upstream to 3.3V (or 5V), and verify that the 1.8V device tolerates the higher voltage during high-state signaling. Since the PCA9544ADW has no internal level shifting, signal integrity depends heavily on proper resistor selection and bus capacitance management; consider adding a dedicated bidirectional level translator (e.g., TXB0104) if timing or noise margins are marginal.
What are the key risks when replacing the PCA9544ADW with the TCA9544APWR in an existing design, especially regarding pin compatibility and electrical behavior?
While the TCA9544APWR is a direct functional substitute from a different manufacturer (Texas Instruments vs. former NXP, now part of Nexperia), subtle differences exist: the TCA9544APWR specifies slightly tighter timing parameters and may exhibit marginally different leakage currents. Both are 20-SOIC pin-compatible, but verify that your PCB layout accommodates minor mechanical tolerances. More critically, the TCA9544APWR has a different moisture sensitivity level (MSL 3 vs. MSL 1 for PCA9544ADW), requiring stricter handling and baking protocols if stored long-term. Always revalidate I2C rise times and interrupt response under worst-case load conditions after substitution.
How should I handle bus contention and fault recovery when using the PCA9544ADW in a multi-master I2C environment with occasional hot-plugging of slave devices?
The PCA9544ADW lacks built-in hot-swap protection or automatic bus recovery, so hot-plugging downstream devices can cause latch-up or signal contention. To mitigate this, implement series current-limiting resistors (100–470Ω) on SDA/SCL lines to each downstream channel and ensure all devices share a common ground reference before connection. Additionally, use the PCA9544ADW’s channel disable feature during insertion/removal via software control of the ENABLE pin or I2C command. Monitor for stuck-low conditions and include a watchdog or periodic bus reset routine in firmware to recover from faults without power cycling.
Given that the PCA9544ADW is in Last Time Buy status, what long-term reliability and sourcing strategies should I adopt for high-volume production designs?
Since the PCA9544ADW is no longer recommended for new designs (Last Time Buy), relying on it for future production poses significant supply chain risk. Secure sufficient inventory only if your product lifecycle is short (<2 years). For long-term designs, migrate to the TCA9544APWR—TI’s actively supported equivalent—or evaluate alternatives like the PCA9546APW (4-channel, same family) or CA91L862A-50IEV for enhanced features. Perform full electrical and thermal characterization of any replacement, including ESD performance and long-term drift under humidity, as MSL and packaging changes can affect field reliability over time.
What layout and decoupling practices are critical to ensure stable operation of the PCA9544ADW in high-noise industrial environments with long I2C traces?
In noisy environments, poor layout can cause false channel switching or communication errors with the PCA9544ADW. Place a 0.1µF ceramic decoupling capacitor as close as possible to the VCC pin, and avoid routing I2C lines parallel to high-speed digital or power traces. Use grounded guard traces around SDA/SCL lines if trace length exceeds 10 cm, and terminate with appropriately sized pull-ups (typically 2.2kΩ to 4.7kΩ) based on total bus capacitance. Ensure the ground plane under the PCA9544ADW is solid and connected to the system ground with minimal impedance—floating or noisy grounds can corrupt the internal logic state, especially during voltage transients.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
PCA9544ADW CAD Models
Texas Instruments PCA9544ADW PCB symbols & footprints
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