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NXP Semiconductors PCA9551BS,118
- Part No.:
- PCA9551BS,118
- Manufacturer:
- NXP Semiconductors
- Category:
- LED Drivers
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
PCA9551BS,118.pdf
- Description:
- IC LED DRVR PS PWM 25MA 16HVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:11,096
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Product details
Overview
PCA9551BS,118 from NXP Semiconductors is an 8-bit I²C-bus LED blinker with dual programmable blink rates (0.148 Hz to 38 Hz), internal oscillator, and open-drain outputs capable of sinking 25 mA per channel and 100 mA total. It offloads LED timing from the host MCU in embedded control panels, industrial HMIs, and telecom status indicators.
For engineers reviewing the PCA9551BS,118 datasheet, PCA9551BS,118 pinout, PCA9551BS,118 application, or PCA9551BS,118 equivalent, key selection criteria include its HVQFN16 thermal-enhanced package, dual independent PWM blink control, GPIO reuse capability, and I²C/SMBus compatibility with noise filtering and hot-insertion support.
Technical Context
The PCA9551BS,118 integrates a precision internal oscillator (no external components required) 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 either blink rate.
I²C interface logic complies with SMBus specifications, includes input noise filters on SCL/SDA, active-low hardware RESET, Power-On Reset (POR), and edge-rate-controlled outputs. Addressing uses three hardware pins (A0–A2), supporting up to eight devices on one bus.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Blink Rate Range | 0.148 Hz to 38 Hz (6.74 s to 26 ms period); enables slow status indication or rapid fault alerting |
| Output Sink Current | 25 mA per LED output, 100 mA total package limit; supports direct drive of standard LEDs without external drivers |
| Supply Voltage | 2.3 V to 5.5 V; compatible with 3.3 V and 5 V systems, including battery-powered designs |
| I²C Clock Frequency | 0–400 kHz (Fast-mode); interoperable with standard and fast I²C masters without protocol translation |
| Standby Current | 1.9 µA typical at 5.5 V; minimizes power draw in always-on indicator applications |
| ESD Protection | 2000 V HBM, 150 V MM, 1000 V CDM; meets industrial handling requirements without additional protection circuitry |
| Operating Temperature | −40 °C to +85 °C; qualified for industrial and extended-temperature embedded environments |
Pinout & Package
HVQFN16 package: plastic thermal-enhanced very thin quad flat package, 4 × 4 × 0.85 mm body, 16 terminals, exposed thermal pad requiring PCB soldering and thermal vias for optimal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Hardware address inputs | Set slave address (3-bit binary); enable up to eight PCA9551BS,118 devices on same I²C bus |
| LED0–LED7 | Open-drain LED driver outputs | Sink up to 25 mA each; configurable as static outputs or blink at BLINK0/BLINK1 rates via LS registers |
| VDD / VSS | Power supply / ground | VDD = 2.3–5.5 V; VSS connected to both pin 6 and exposed center pad-both must be grounded |
| SCL / SDA | I²C serial clock/data | Compatible with SMBus; include internal noise filters; require external pull-ups |
| RESET | Active-low hardware reset | Asynchronous reset; holds registers in default state (all outputs HIGH/off) until deasserted |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent blink engines | Separate PSC0/PWM0 and PSC1/PWM1 registers allow concurrent blinking at different frequencies and duty cycles |
| GPIO reuse capability | Unused LEDn pins function as general-purpose inputs/outputs with high-impedance mode and read-back via INPUT register |
| No external timing components | Internal oscillator eliminates need for crystals, RC networks, or external clocks-reducing BOM count and layout area |
| Robust I²C interface | Input noise filters, edge-rate control, hot-insertion support, and 400 kHz Fast-mode operation ensure reliable bus communication |
| Thermally optimized HVQFN | Exposed thermal pad and low RθJA enable sustained 100 mA sink current in compact space-constrained designs |
Applications
| Industrial Control Panel Status Indicators | Telecom Equipment Fault Alarms |
|---|---|
Use Scenario: Visual status feedback for PLC I/O modules, relay banks, or safety interlock states in factory automation cabinets. IC Role / Device Role / Timing Role: LED blinker managing 8 discrete status LEDs with independent blink patterns (e.g., steady green = OK, 2 Hz red = warning, 8 Hz red = critical fault). Use Value: Reduces host MCU interrupt load and I²C bus traffic by >90% compared to software-timed GPIO toggling; enables deterministic timing without CPU involvement. | Use Scenario: Chassis-level fault signaling in carrier-grade routers, optical line terminals, and base station controllers. IC Role / Device Role / Timing Role: Dedicated blink controller for front-panel alarm LEDs-blinking at standardized rates (e.g., ETSI-compliant 1 Hz or 4 Hz) per service failure type. Use Value: Guarantees precise, jitter-free blink timing across temperature and voltage; eliminates firmware dependency for compliance-critical timing behavior. |
| Medical Device Power-On Self-Test Indicators | Consumer Appliance UI Feedback |
Use Scenario: Multi-stage boot indicator during POST sequence in diagnostic imaging or patient monitor systems. IC Role / Device Role / Timing Role: Drives sequential LED activation (e.g., LED0–LED3 lit in order, then all blink at 0.5 Hz upon completion) using pre-programmed register states. Use Value: Provides fail-safe visual diagnostics independent of main application processor; POR and RESET ensure consistent startup behavior after brownouts. | Use Scenario: Mode-selection and cycle-progress feedback in smart washing machines, ovens, or HVAC remotes. IC Role / Device Role / Timing Role: Controls backlight dimming (via PWM0 duty cycle) and status LED pulsing (via BLINK1) using same I²C transaction set. Use Value: Enables rich UI effects (e.g., breathing pulse, heartbeat blink) with zero MCU timer resource usage-extending battery life in portable variants. |
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 HVQFN24 package; higher channel count but larger footprint | Required when >8 LED channels needed; shares same register map and I²C protocol | Select PCA9552DP,118 only if system requires ≥9 independently controlled LEDs; otherwise PCA9551BS,118 offers optimal size/cost balance. |
| PCA9634PW,118 | Fast-mode Plus I²C (1 MHz), individual 8-bit PWM per channel, 200 mA package sink, 126 address options | Needed for RGB color mixing, global dimming, or higher bus throughput; not drop-in due to different register structure | Choose PCA9634PW,118 when precise per-channel brightness control or faster bus response is mandatory; PCA9551BS,118 remains preferred for simple blink-only use cases. |
Compared with PCA9552DP,118 and PCA9634PW,118, the PCA9551BS,118 delivers minimal-footprint, low-power blink functionality with deterministic timing-making it ideal for cost-sensitive, space-constrained applications where 8 channels and dual-rate blinking suffice without advanced PWM features.
Availability
PCA9551BS,118 is available at Aetrix Electronics and suitable for industrial control panels, telecom equipment alarms, medical device self-test indicators, and consumer appliance UIs requiring stable component supply and long-term manufacturability.
Supply support for PCA9551BS,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.
The PCA9551BS,118 belongs to NXP's I²C-bus peripheral family designed specifically to reduce host processor overhead in LED-driven user interfaces and status monitoring systems.
FAQ
What is the primary function of the PCA9551BS,118?
The PCA9551BS,118 is an 8-bit I²C-bus LED blinker that autonomously controls LED on/off and blinking using two independent programmable rates-eliminating the need for host MCU timer resources or repeated I²C commands. Its core function is deterministic, low-overhead LED timing in embedded systems.
Does the PCA9551BS,118 require external components for oscillator operation?
No-the PCA9551BS,118 contains a fully integrated internal oscillator with no external crystal, resistor, or capacitor required. This simplifies design, reduces BOM cost, and improves reliability compared to discrete timing solutions. All blink timing is derived from this on-chip oscillator.
Can unused LED outputs on the PCA9551BS,118 be used as general-purpose I/Os?
Yes-any LEDn pin not assigned to blink or static LED control can be configured as a general-purpose input or output. As input, set to high-impedance and read via the INPUT register; as output, drive LOW or HIGH-impedance with external pull-up, supporting button sensing or signal buffering without additional ICs.
What is the maximum sink current per output and total for the PCA9551BS,118?
The PCA9551BS,118 supports up to 25 mA sink current per LED output (LED0–LED7) and a maximum total package sink current of 100 mA. Exceeding 100 mA aggregate may cause thermal shutdown or parametric shift; design must ensure sum of active outputs stays within this limit.
How does the PCA9551BS,118 handle power-up and reset conditions?
The PCA9551BS,118 incorporates both Power-On Reset (POR) and active-low hardware RESET. POR initializes all registers to default states (outputs HIGH/off) when VDD crosses VPOR (~1.7–2.2 V). External RESET pin assertion forces immediate reinitialization-critical for deterministic recovery after brownouts or system faults.
PCA9551BS,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 16-VQFN Exposed Pad
- 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-HVQFN (4x4)
PCA9551BS,118 FAQ
1.How can I place an order for PCA9551BS,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9551BS,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 PCA9551BS,118 reliable?
The price and inventory of PCA9551BS,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9551BS,118 is usually 5 days.
3.What payment methods are accepted for PCA9551BS,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9551BS,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9551BS,118?
PCA9551BS,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9551BS,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 PCA9551BS,118?
For technical support, including PCA9551BS,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9551BS,118 requirements.
6.How does Aetrix verify that PCA9551BS,118 is sourced from the original manufacturer or authorized distributors?
All PCA9551BS,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 PCA9551BS,118 meets industry standards.
7.What is the process for return or replacement of PCA9551BS,118?
All PCA9551BS,118 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9551BS,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 PCA9551BS,118 part is unused and in its original packaging.
Return procedure for PCA9551BS,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PCA9551BS,118 Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
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