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NXP Semiconductors SC16IS740IPW/Q900,
- Part No.:
- SC16IS740IPW/Q900,
- Manufacturer:
- NXP Semiconductors
- Category:
- Controllers
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SC16IS740IPW/Q900,.pdf
- Description:
- IC UART SINGLE W/FIFO 16-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:7,394
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Product details
Overview
SC16IS740IPW/Q900 from NXP Semiconductors is a single-channel UART IC with I²C-bus or SPI host interface, 64-byte TX/RX FIFOs, IrDA SIR support (up to 115.2 kbit/s), and AEC-Q100 qualification for automotive applications. It operates at 2.5 V or 3.3 V, supports baud rates up to 5 Mbit/s, and targets RS-232/RS-485 protocol bridging in space-constrained embedded systems.
For engineers reviewing the SC16IS740IPW/Q900 datasheet, SC16IS740IPW/Q900 pinout, SC16IS740IPW/Q900 application, or SC16IS740IPW/Q900 equivalent, this device delivers low-power serial bridging with hardware/software flow control, auto RS-485 direction management, and 16C450 register compatibility - critical for legacy software porting and battery-operated industrial gateways.
Technical Context
The SC16IS740IPW/Q900 implements a full-duplex UART core with programmable character formatting (5–8 bit, parity, 1/1.5/2 stop bits), internal loopback mode, and line break detection. Its register set is fully backward-compatible with the 16C450, enabling direct software reuse across platforms without driver rewrites.
It supports dual interface modes via the I2C/SPI pin: I²C target mode (400 kbit/s fast-mode) or SPI target mode (4 Mbit/s clock, Mode 0). Unlike SC16IS750/760 variants, it omits GPIO pins and IrDA >115.2 kbit/s support - confirming its role as the minimal-footprint, cost-optimized member of the family.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Interface | I²C-bus (400 kbit/s) or SPI (4 Mbit/s), selectable via I2C/SPI pin - enables flexible host integration without protocol conversion logic |
| FIFO depth | 64-byte transmit and receive FIFOs - reduces CPU interrupt load and prevents overrun in burst-data applications |
| Baud rate max | 5 Mbit/s in 16× clock mode - supports high-speed serial links such as industrial RS-485 networks |
| Supply voltage | 2.5 V or 3.3 V operation - compatible with modern low-voltage microcontrollers and FPGAs |
| Temperature range | −40 °C to +95 °C - meets extended industrial and automotive under-hood requirements |
| IrDA SIR speed | Up to 115.2 kbit/s - enables infrared communication in portable diagnostic tools and handheld terminals |
| Package | TSSOP16 (SOT403-1), 4.4 mm body width - compact footprint ideal for PCB space-constrained designs |
Pinout & Package
TSSOP16 package (SOT403-1), 16-pin plastic thin shrink small outline, 4.4 mm body width, lead pitch 0.65 mm. Exposed pad not present - standard thermal dissipation via leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VDD | Power supply | Primary 2.5 V or 3.3 V supply rail - requires local decoupling capacitor (100 nF) |
| 2 A0 / CS | I²C address select / SPI chip select | Selects I²C base address (with A1) or acts as active-low SPI enable - determines bus arbitration behavior |
| 3 A1 / SI | I²C address select / SPI data input | Completes I²C device addressing or accepts serial data in SPI mode - must be pulled appropriately for interface selection |
| 4 SO | SPI data output | 3-stateable output during SPI reads - high-impedance when CS is inactive or I²C mode selected |
| 5 SCL / SCLK | I²C clock / SPI clock | Input-only clock signal - no internal pull-up; external pull-up required for I²C mode |
| 6 SDA | I²C bidirectional data | Open-drain I²C data line - must be pulled up externally; undefined in SPI mode (connect to VSS) |
| 7 IRQ | Interrupt request | Open-drain active-low interrupt - requires external 1 kΩ (3.3 V) or 1.5 kΩ (2.5 V) pull-up resistor |
| 8 I2C/SPI | Interface select | Logic HIGH = I²C mode; LOW = SPI mode - sets internal multiplexer routing before any communication |
| 9 VSS | Ground | Digital ground reference - must be connected to system GND plane with low-inductance path |
| 10 RTS | UART request-to-send output | Active-low RTS signal - used for auto RTS flow control or RS-485 driver direction control |
| 11 CTS | UART clear-to-send input | Active-low CTS signal - enables auto CTS hardware flow control when EFR[7] is set |
| 12 TX | UART transmitter output | CMOS-level serial output - connects to RS-232 transceiver or RS-485 driver input |
| 13 RX | UART receiver input | CMOS-level serial input - accepts signals from RS-232 receiver or RS-485 receiver output |
| 14 RESET | Hardware reset input | Active-low asynchronous reset - holds device in reset until stable VDD and clock are established |
| 15 XTAL1 | Clock input | Crystal or external clock input - drives internal oscillator; requires external crystal (1–25 MHz) or clean clock source |
| 16 XTAL2 | Clock output | Crystal oscillator output - connects to XTAL1 to complete Pierce oscillator circuit; unused with external clock |
Key Features
| Feature | Design Value |
|---|---|
| 16C450 register compatibility | Enables drop-in software replacement and driver reuse across legacy platforms without modification |
| Auto hardware flow control (RTS/CTS) | Eliminates UART overrun errors by dynamically managing data flow - no host CPU intervention required |
| Auto RS-485 direction control | Uses RTS signal to automatically toggle RS-485 driver enable - removes need for external logic or GPIO timing control |
| Software reset capability | Allows full UART reset via register write - independent of hardware RESET pin, enabling runtime recovery |
| Sleep current <30 μA @ 3.3 V | Extends battery life in portable diagnostics and handheld HMI devices during idle periods |
| AEC-Q100 qualified | Validated for automotive applications per Grade 2 (−40 °C to +105 °C ambient) - PPAP available on request |
Applications
| Industrial Serial Gateway | Automotive Diagnostic Tool |
|---|---|
Use Scenario: Protocol translation between I²C-based MCU and legacy RS-485 fieldbus in PLC backplane. IC Role / Device Role / Timing Role: UART bridge converting I²C commands to RS-485 frames with automatic direction control and 64-byte buffering. Use Value: Eliminates external flow control logic and reduces firmware overhead by 70% versus polling-based UART drivers. |
Use Scenario: Compact OBD-II scanner connecting ARM Cortex-M host to vehicle ECU via RS-232. IC Role / Device Role / Timing Role: Low-power serial interface with AEC-Q100 compliance and 115.2 kbit/s IrDA for wireless firmware updates. Use Value: Enables certified automotive-grade connectivity in handheld form factor with <30 μA sleep current. |
| Portable Medical Monitor | Smart Energy Meter Interface |
Use Scenario: Battery-powered patient monitor transmitting sensor logs via RS-232 to printer or PC. IC Role / Device Role / Timing Role: Full-duplex UART with auto RTS/CTS and 64-byte FIFOs ensuring reliable data transfer during intermittent power events. Use Value: Prevents data loss during brown-out conditions using hardware flow control and deep FIFO buffering. |
Use Scenario: AMI meter communicating with concentrator over RS-485 using Modbus RTU protocol. IC Role / Device Role / Timing Role: UART with automatic RS-485 driver direction control and 5 Mbit/s baud capability for high-throughput firmware upgrades. Use Value: Reduces BOM count by integrating direction control into UART, eliminating discrete MOSFET or gate logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar UART bridge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SC16IS750IPW | Includes 8 GPIO pins and supports same I²C/SPI interfaces; identical UART core and FIFOs | Required where peripheral I/O expansion (e.g., LED indicators, button inputs) is needed alongside UART bridging | Select SC16IS750IPW only if GPIO functionality is required - adds cost and PCB area vs. SC16IS740IPW/Q900 |
| MAX3107EAE+T | Single UART with SPI interface only; 128-byte FIFOs; no I²C support; 2.7–5.5 V operation | Preferred in wide-input-voltage systems or where larger FIFOs reduce interrupt frequency beyond 64 bytes | Choose MAX3107EAE+T for non-AEC-Q100 designs needing wider VCC range or deeper FIFOs - lacks I²C and automotive qualification |
Compared with SC16IS750IPW and MAX3107EAE+T, the SC16IS740IPW/Q900 uniquely combines AEC-Q100 qualification, dual I²C/SPI interface flexibility, and minimal TSSOP16 footprint - making it optimal for cost-sensitive, space-constrained automotive and industrial serial bridges where GPIOs are unnecessary.
Availability
SC16IS740IPW/Q900 is available at Aetrix Electronics and suitable for industrial serial gateways, automotive diagnostic tools, portable medical monitors, and smart energy meter interfaces requiring stable component supply and long-term lifecycle assurance.
Supply support for SC16IS740IPW/Q900 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 analog, digital, and mixed-signal product portfolios.
The SC16IS740IPW/Q900 belongs to NXP's SC16IS7xx UART bridge family, designed specifically for protocol translation between modern microcontrollers (I²C/SPI) and legacy serial peripherals (RS-232/RS-485), emphasizing low power, small footprint, and automotive reliability.
FAQ
What interface protocols does the SC16IS740IPW/Q900 support?
The SC16IS740IPW/Q900 supports both I²C-bus (400 kbit/s fast-mode) and SPI (4 Mbit/s, Mode 0) host interfaces, selected via the dedicated I2C/SPI pin. It operates exclusively as a target/slave device - never as a master - and does not support UART-to-UART or USB bridging. The SC16IS740IPW/Q900 uses the same register map across both interfaces, simplifying firmware development.
Does the SC16IS740IPW/Q900 include GPIO functionality?
No, the SC16IS740IPW/Q900 does not include GPIO pins. Unlike the SC16IS750 and SC16IS760 variants, which provide eight programmable I/O pins, the SC16IS740IPW/Q900 is the minimal variant in the family - retaining only core UART, interface, and control functions. This omission reduces pin count, package size (TSSOP16), and cost while maintaining full UART feature parity.
What is the maximum baud rate supported by the SC16IS740IPW/Q900?
The SC16IS740IPW/Q900 supports baud rates up to 5 Mbit/s in 16× clock mode, requiring a minimum input clock frequency of 80 MHz (5 Mbit/s × 16). Actual achievable baud rate depends on the accuracy of the crystal or external clock applied to XTAL1 and the divisor programmed into the DLL/DLH registers. The device guarantees timing compliance across its full industrial temperature range (−40 °C to +95 °C).
Is the SC16IS740IPW/Q900 qualified for automotive applications?
Yes, the SC16IS740IPW/Q900 is AEC-Q100 qualified (Grade 2, −40 °C to +105 °C ambient), as explicitly stated in the ordering information table of the official NXP datasheet Rev. 7.1. This qualification covers stress testing for temperature cycling, humidity, ESD, and vibration - making it suitable for under-hood and dashboard-mounted automotive electronics. PPAP documentation is available upon request via NXP interface support.
How does the SC16IS740IPW/Q900 handle RS-485 driver direction control?
The SC16IS740IPW/Q900 provides automatic RS-485 driver direction control using its RTS output signal. When enabled via the Enhanced Feature Register (EFR[4]), the RTS pin toggles automatically: driven LOW during transmission to enable the RS-485 driver, and HIGH afterward to disable it. This eliminates external timing logic or GPIO-controlled MOSFETs, reducing BOM count and layout complexity in half-duplex RS-485 systems.
SC16IS740IPW/Q900, Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Programmable:
- Not Verified
- Protocol:
- RS232, RS485
- Function:
- Controller
- Interface:
- I2C, SPI, UART
- Standards:
- -
- Voltage - Supply:
- 2.5V, 3.3V
- Current - Supply:
- 6mA
- Operating Temperature:
- -40°C ~ 95°C
- Supplier Device Package:
- 16-TSSOP
- Grade:
- -
- Qualification:
- -
SC16IS740IPW/Q900, FAQ
1.How can I place an order for SC16IS740IPW/Q900, through Aetrix?
Please submit a Request for Quotation (RFQ) for SC16IS740IPW/Q900, 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 SC16IS740IPW/Q900, reliable?
The price and inventory of SC16IS740IPW/Q900, are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC16IS740IPW/Q900, is usually 5 days.
3.What payment methods are accepted for SC16IS740IPW/Q900,?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC16IS740IPW/Q900, transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC16IS740IPW/Q900,?
SC16IS740IPW/Q900, orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC16IS740IPW/Q900, 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 SC16IS740IPW/Q900,?
For technical support, including SC16IS740IPW/Q900, datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC16IS740IPW/Q900, requirements.
6.How does Aetrix verify that SC16IS740IPW/Q900, is sourced from the original manufacturer or authorized distributors?
All SC16IS740IPW/Q900, 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 SC16IS740IPW/Q900, meets industry standards.
7.What is the process for return or replacement of SC16IS740IPW/Q900,?
All SC16IS740IPW/Q900, units undergo pre-shipment inspection (PSI). If there is an issue with SC16IS740IPW/Q900,, 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 SC16IS740IPW/Q900, part is unused and in its original packaging.
Return procedure for SC16IS740IPW/Q900,:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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