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NXP Semiconductors PCA9551D,118
- Part No.:
- PCA9551D,118
- Manufacturer:
- NXP Semiconductors
- Category:
- LED Drivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
PCA9551D,118.pdf
- Description:
- IC LED DRIVER PS PWM 25MA 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:484
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Product details
Overview
PCA9551D,118 from NXP Semiconductors is an 8-bit I²C-bus LED blinker with dual programmable blink rates (0.148–38 Hz), 8 open-drain outputs (25 mA per output, 100 mA total), and integrated oscillator-eliminating external timing components. It operates from 2.3 V to 5.5 V and supports SMBus-compatible communication in embedded UI, status indication, and industrial control panels.
For engineers reviewing the PCA9551D,118 datasheet, PCA9551D,118 pinout, PCA9551D,118 application, or PCA9551D,118 equivalent, key selection criteria include I²C address configurability (3 hardware pins → 8 devices/bus), GPIO reuse capability for unused LED drivers, and precise PWM-based blink rate independence from host MCU timing resources.
Technical Context
The PCA9551D,118 implements a dedicated internal oscillator driving two independent prescaler-PWM paths (PSC0/PWM0 and PSC1/PWM1), enabling simultaneous blinking at distinct frequencies and duty cycles. Its register map includes LED selector bits (LS0/LS1) that assign each of eight outputs to static ON/OFF or one of two blink modes-without host intervention after initialization.
I²C interface logic complies with Standard- and Fast-mode specifications (up to 400 kHz), features noise filtering on SCL/SDA, and includes auto-increment addressing for sequential register access. Power-on reset and active-low RESET pin ensure deterministic startup and system-level recovery, while edge-rate control minimizes EMI on open-drain outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Blink frequency range | 0.148 Hz to 38 Hz (6.74 s to 26 ms period); enables slow status indicators and rapid alert signals without MCU timer load. |
| Output sink current | 25 mA per channel, 100 mA total package limit; directly drives standard LEDs without external transistors. |
| Supply voltage range | 2.3 V to 5.5 V; interoperable across 3.3 V and 5 V logic domains in mixed-voltage systems. |
| I²C clock support | 0–400 kHz; compatible with Standard- and Fast-mode I²C buses and SMBus 2.0 timing requirements. |
| Standby current | 1.9–3.0 µA at 5.5 V; suitable for battery-powered applications requiring ultra-low quiescent power. |
| ESD protection | 2000 V HBM, 150 V MM, 1000 V CDM; meets industrial handling robustness standards without external protection. |
| Operating temperature | −40 °C to +85 °C; qualified for industrial and automotive cabin-ambient environments. |
Pinout & Package
PCA9551D,118 is supplied in SO16 (SOT109-1) plastic small outline package: 16-pin, 3.9 mm body width, surface-mount, with standard lead pitch (1.27 mm). Thermal and mechanical data confirm compatibility with IPC-7351B footprint standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Hardware I²C slave address inputs | Set 3-bit device address (000–111); enable up to eight PCA9551D,118 devices on same bus without software address conflict. |
| LED0–LED7 | Open-drain LED driver outputs / GPIOs | Each pin sinks up to 25 mA; configured via LS0/LS1 registers as static output, high-Z input, or blink mode (BLINK0/BLINK1). |
| SCL / SDA | I²C serial clock/data bidirectional lines | Feature internal noise filters; require external pull-up resistors; support repeated START and clock stretching. |
| RESET | Active-low asynchronous reset input | Holding LOW ≥8 ns forces all registers to default state (all outputs HIGH/LED off); requires external pull-up if unused. |
| VDD / VSS | Power supply and ground | VDD accepts 2.3–5.5 V; VSS must be connected to system ground; no internal LDO-supply must be clean and stable. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent blink engines | Separate PSC0/PWM0 and PSC1/PWM1 registers allow concurrent blinking at different frequencies (e.g., heartbeat + alarm) without host CPU involvement. |
| No external timing components | On-chip oscillator eliminates need for crystals, RC networks, or external clocks-reducing BOM count and board space. |
| GPIO reuse capability | Unused LEDn pins function as configurable inputs/outputs via Input register and LSx controls-enabling mixed-signal expansion without extra ICs. |
| I²C auto-increment addressing | Control register AI bit enables sequential read/write across multiple registers with single START condition-reducing bus transaction overhead. |
| Robust power sequencing | Power-on reset triggers at VPOR = 1.7–2.2 V; ensures defined output state (all LEDs OFF) during brown-out or cold start. |
Applications
| Industrial HMI Panels | Consumer Electronics UI |
|---|---|
Use Scenario: Status indication for PLC I/O modules, motor starters, and safety interlock systems with ambient temperature extremes. IC Role / Device Role / Timing Role: LED blinker managing 8 discrete status lights (RUN, FAULT, COMM, etc.) using BLINK0 for steady heartbeat and BLINK1 for fault alerts. Use Value: Offloads MCU timer resources and reduces I²C traffic by >90% versus polled GPIO toggling-improving real-time responsiveness and firmware simplicity. |
Use Scenario: Front-panel LED feedback on smart speakers, set-top boxes, and network routers with multi-color status coding. IC Role / Device Role / Timing Role: Driving RGB indicator LEDs where LED0–LED2 control red/green/blue channels independently, each assigned to BLINK0 or BLINK1 for synchronized pulsing effects. Use Value: Enables smooth visual transitions (e.g., breathing, strobe) without host CPU interrupt servicing-preserving processing bandwidth for audio/video tasks. |
| Automotive Cabin Controls | Medical Device Indicators |
Use Scenario: Backlit button status and warning indicators in infotainment control panels operating at −40 °C to +85 °C. IC Role / Device Role / Timing Role: Managing 6 LED indicators (power, volume, source, mute, Bluetooth, USB) with BLINK0 for power-on sequence and BLINK1 for connection status. Use Value: Meets AEC-Q200-relevant robustness (ESD, thermal, voltage range); eliminates flicker caused by software-timed toggling under variable CPU load. |
Use Scenario: Patient monitor status lights (power, alarm, data link, battery) requiring fail-safe visual feedback in clinical environments. IC Role / Device Role / Timing Role: Providing redundant blink patterns: BLINK0 for normal operation (1 Hz), BLINK1 for critical alarms (4 Hz, 25% duty cycle) per IEC 62304 guidance. Use Value: Guarantees deterministic blink timing even during host MCU resets or firmware updates-ensuring continuous compliance with medical usability standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED blinker applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCA9552DP,118 | 16-bit version with identical blink architecture, same 25 mA/channel, but double the output count and extended address space (4 address pins). | Required when >8 LED indicators or higher channel density is needed per bus segment; shares same register map and timing behavior. | Select PCA9552DP,118 only when expanding beyond 8 outputs-pinout and software are not compatible with PCA9551D,118. |
| PCA9634PW,118 | 8-bit Fast-mode Plus LED controller with per-channel 8-bit PWM dimming (not blink-only), 200 mA package sink, and 126 address options. | Supports color mixing and analog-like brightness control; lacks dedicated blink engine-blinking requires host-driven PWM modulation. | Choose PCA9634PW,118 for RGB lighting or fine-grained intensity control; PCA9551D,118 remains optimal for simple, low-overhead blink-only use cases. |
Compared with PCA9552DP,118 and PCA9634PW,118, the PCA9551D,118 delivers minimal-footprint, zero-software-overhead blinking for fixed-pattern indicators-making it ideal for cost-sensitive, resource-constrained designs where per-channel dimming or >8 outputs are unnecessary.
Availability
PCA9551D,118 is available at Aetrix Electronics and suitable for industrial HMI panels, consumer electronics UI, and automotive cabin controls requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for PCA9551D,118 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications-with broad expertise in I²C peripherals and mixed-signal interface ICs.
The PCA9551D,118 belongs to NXP's legacy I²C LED driver family designed specifically for reducing MCU resource load in status-indication subsystems-prioritizing deterministic timing, low power, and bus efficiency over programmable dimming.
FAQ
What is the maximum sink current per output on the PCA9551D,118?
The PCA9551D,118 supports up to 25 mA sink current per LED output (LED0–LED7), with a total package limit of 100 mA. Exceeding either value risks thermal shutdown or permanent damage. Current must be externally limited via series resistors sized per VDD and LED forward voltage-no internal current regulation is provided.
How do I configure the PCA9551D,118 to blink two LEDs at different rates simultaneously?
To blink two LEDs at different rates, program PSC0/PWM0 for BLINK0 (e.g., 1 Hz, 50% duty) and PSC1/PWM1 for BLINK1 (e.g., 4 Hz, 25% duty), then set their respective LED selector bits (LS0/LS1) to "10" and "11". The PCA9551D,118 executes both blink patterns autonomously-no further I²C commands required after initialization.
Does the PCA9551D,118 require external components for its oscillator?
No-the PCA9551D,118 integrates a precision internal oscillator with no external components required. This eliminates crystal loading, capacitor matching, or RC timing inaccuracies, simplifying layout and improving reliability across temperature and voltage variations.
Can unused LED outputs on the PCA9551D,118 be used as general-purpose I/Os?
Yes-any LEDn pin not assigned to blink or static drive can be reconfigured as GPIO. Set its LSx bit to "01" (high-Z) for input mode (read via INPUT register), or use external pull-up with "00" (LOW) or "10/11" (PWM-controlled) for output. No additional configuration registers are needed.
What happens to PCA9551D,118 outputs during power-on or reset?
During power-on or RESET assertion, all PCA9551D,118 registers initialize to default values: LS0/LS1 = 01 (LEDs OFF), PSC0/PSC1 = 0xFF, PWM0/PWM1 = 0x80. This forces all outputs to high-impedance (LEDs extinguished), ensuring safe, predictable startup without unintended illumination.
PCA9551D,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Power Switch
- Topology:
- -
- Internal Switch(s):
- Yes
- Number of Outputs:
- 8
- Voltage - Supply (Min):
- 2.3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 25mA
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
PCA9551D,118 FAQ
1.How can I place an order for PCA9551D,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9551D,118 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for PCA9551D,118 reliable?
The price and inventory of PCA9551D,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9551D,118 is usually 5 days.
3.What payment methods are accepted for PCA9551D,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9551D,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9551D,118?
PCA9551D,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9551D,118 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for PCA9551D,118?
For technical support, including PCA9551D,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9551D,118 requirements.
6.How does Aetrix verify that PCA9551D,118 is sourced from the original manufacturer or authorized distributors?
All PCA9551D,118 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PCA9551D,118 meets industry standards.
7.What is the process for return or replacement of PCA9551D,118?
All PCA9551D,118 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9551D,118, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The PCA9551D,118 part is unused and in its original packaging.
Return procedure for PCA9551D,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PCA9551D,118 Tags
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BCR402RE6327HTSA1
Infineon Technologies
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Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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Infineon Technologies
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LYT1604D-TL
Power Integrations
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Microchip Technology
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Microchip Technology
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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