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Home > Products > Integrated Circuits (ICs) > Interface > Drivers, Receivers, Transceivers

STMicroelectronics ST26C31BDR

Name: ST26C31BDR
Brand: STMicroelectronics
SKU: ST26C31BDR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ST26C31BDR

Manufacturer:: STMicroelectronics

Category:: Drivers, Receivers, Transceivers

Package:: 16-SOIC (0.154", 3.90mm Width)

Datasheet:: ST26C31BDR.pdf

Description:: IC TRANSCEIVER 4/0 16SO

Quantity:: RFQ Add To RFQ list

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Inventory:45,613

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Product details

Overview

ST26C31BDR from STMicroelectronics is a quad 3-state differential line driver compliant with EIA RS-422, operating from a single 5 V supply, featuring 6 ns typical propagation delay, 0.5 ns typical output skew, and TTL/CMOS input compatibility for balanced digital data transmission in industrial serial interfaces.

For engineers reviewing the ST26C31BDR datasheet, ST26C31BDR pinout, ST26C31BDR application, or ST26C31BDR equivalent, key selection criteria include RS-422 differential drive capability, 3-state bus interface support, low quiescent current (200–500 µA), and SO-16 package suitability for high-density PCB layouts.

Technical Context

The ST26C31BDR implements four independent differential drivers with shared enable logic per pair (pins 4 & 12), each translating TTL/CMOS inputs into RS-422-compliant differential outputs (AOUT/AOUT, BOUT/BOUT, etc.). All outputs feature diode-based ESD protection to V_CC and ground.

It operates within 4.5–5.5 V supply range and -40°C to +85°C ambient, with guaranteed differential output voltage ≥2 V (min) into 100 Ω load and common-mode output voltage between 1.8–3 V - meeting RS-422 common-mode tolerance and noise immunity requirements.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.5–5.5 V - ensures compatibility with standard 5 V logic systems and margin against rail droop.
Propagation Delay	2–11 ns (typ 6 ns) - enables reliable operation up to ~80 Mbps in point-to-point RS-422 links.
Output Skew	0.5–2 ns (typ 0.5 ns) - minimizes timing mismatch between complementary outputs, critical for signal integrity.
Differential Output Voltage	2–3.1 V (min 2 V) - meets RS-422 minimum differential swing for robust noise rejection (>200 mV margin).
Quiescent Supply Current	200–500 µA - supports low-power system standby modes without disabling transceivers.
3-State Leakage	±0.5 µA (typ) - prevents bus contention and signal corruption when outputs are disabled.
Power-Off Leakage	±100 µA at V_CC = 0 V - allows safe hot-plug or partial power-down without loading downstream lines.

Pinout & Package

ST26C31BDR is housed in a 16-pin SOIC (SO-16) surface-mount package with 1.27 mm pitch, JEDEC MS-012AC compliant, RoHS-compliant and ECOPACK® certified.

Pin/Terminal	Circuit Role	Design Meaning
1, 7, 9, 15	AIN / BIN / CIN / DIN	TTL/CMOS-compatible digital inputs driving respective differential channels.
2–3, 5–6, 10–11, 13–14	AOUT/AOUT / BOUT/BOUT / COUT/COUT / DOUT/DOUT	Complementary RS-422 differential outputs; require 100 Ω termination across pair.
4, 12	EN	Active-high enable control per channel pair; drives all four outputs into high-impedance when low.
8	GND	System ground reference for all I/O and supply return paths.
16	V_CC	Single 5 V supply powering internal CMOS logic and output stage biasing.

Key Features

Feature	Design Value
RS-422 Compliance	Fully meets EIA-422 electrical specifications including differential swing, common-mode range, and loading behavior.
Bus-Friendly 3-State Outputs	Independent EN pins per pair allow selective channel disabling without affecting other drivers on shared bus lines.
Zero-Voltage Line Isolation	Outputs remain high-impedance even when V_CC = 0 V, preventing back-driving of powered-down systems.
ESD Protection	Integrated diodes to V_CC and GND provide ±2 kV HBM ESD robustness per IEC 61000-4-2 Level 2.

Applications

Industrial PLC Backplane

Point-to-Point Serial Link

Use Scenario: Transmitting synchronized I/O status between CPU and remote I/O modules over 10–30 m twisted-pair cabling in noisy factory environments.

IC Role / Device Role / Timing Role: Differential line driver converting parallel controller outputs into noise-immune RS-422 signals for long-haul transmission.

Use Value: 2 V min differential swing and 0.5 ns skew ensure bit-error-free communication at 10 Mbps under 2 kV EFT interference.

Use Scenario: Interfacing an FPGA UART peripheral to a remote sensor node via shielded twisted pair in building automation systems.

IC Role / Device Role / Timing Role: Level-shifting and driving isolated RS-422 physical layer from 3.3 V or 5 V logic domain.

Use Value: TTL-compatible inputs eliminate need for external level shifters; 6 ns propagation delay preserves timing margins in full-duplex designs.

Multidrop Data Bus

Test Equipment Interface

Use Scenario: Driving multiple RS-422 receivers from a single master controller in semiconductor ATE rack systems.

IC Role / Device Role / Timing Role: Quad driver enabling simultaneous transmission to four independent receiver branches with matched timing.

Use Value: Per-pair EN control allows dynamic bus arbitration; 0.5 ns skew maintains inter-channel synchronization across 4 channels.

Use Scenario: Integrating legacy GPIB or RS-232 instruments into modern PXI chassis using RS-422 bridging modules.

IC Role / Device Role / Timing Role: Reliable physical layer driver for SCPI command streams requiring deterministic latency and error resilience.

Use Value: Low quiescent current (200 µA) reduces thermal load in densely packed test enclosures; SO-16 footprint eases rework and layout.

Equivalent & Alternatives

The following parts are listed as comparable options for similar differential line driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN65LVD11DR	Lower supply range (3–3.6 V), higher speed (250 Mbps), no TTL input compatibility.	Designed for LVDS, not RS-422; requires external level translation for TTL inputs.	Select only if migrating to 3.3 V systems and LVDS signaling; not drop-in for ST26C31BDR's 5 V/RS-422 use case.
MAX3080CSA+	Higher ESD rating (±15 kV), integrated fail-safe biasing, but 10 ns max propagation delay.	Includes RS-485 half-duplex support and open-circuit detection; more complex control interface.	Prefer when system-level fault tolerance (fail-safe, hot-swap) is required beyond basic RS-422 drive.

Compared with SN65LVD11DR and MAX3080CSA+, the ST26C31BDR uniquely balances 5 V TTL compatibility, RS-422 compliance, low skew, and minimal quiescent power - making it optimal for cost-sensitive, noise-prone industrial serial backplanes where 5 V infrastructure dominates.

Availability

ST26C31BDR is available at Aetrix Electronics and suitable for industrial PLC backplanes, point-to-point serial links, and multidrop data buses requiring stable component supply, long-term manufacturability, and RoHS-compliant SO-16 packaging.

Supply support for ST26C31BDR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, analog ICs, power management devices, and discrete components for industrial, automotive, and consumer markets.

The ST26C31BDR belongs to ST's legacy RS-422/RS-485 interface portfolio, engineered specifically for robust, low-power differential data transmission in electrically noisy industrial control and instrumentation systems.

FAQ

What is the maximum data rate supported by ST26C31BDR?

The ST26C31BDR supports reliable operation up to approximately 80 Mbps, derived from its 2 ns minimum propagation delay and 0.5 ns typical output skew - enabling clean eye diagrams at 10–20 Mbps in real-world 100 Ω terminated lines with 10–30 m cable runs. Higher rates depend on layout, termination, and noise conditions.

Can ST26C31BDR drive RS-485 networks?

No - ST26C31BDR is an RS-422 driver only: it provides four unidirectional differential outputs without built-in receiver or tri-state control for half-duplex RS-485 bus sharing. It lacks the DE/RE control logic and fail-safe biasing required for RS-485 compliance, though its outputs meet RS-485 voltage thresholds when used in point-to-point mode.

Does ST26C31BDR require external pull-up/pull-down resistors on inputs?

No - the ST26C31BDR inputs are TTL-compatible with defined VIH (≥2 V) and VIL (≤0.8 V) thresholds and ≤1 µA input current; they do not float and require no external biasing unless interfacing with open-drain or high-impedance sources. Unused inputs should be tied to V_CC or GND for noise immunity.

Is the SO-16 package of ST26C31BDR lead-free and RoHS compliant?

Yes - ST26C31BDR uses an ECOPACK®-certified SO-16 package with lead-free second-level interconnect, compliant with RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level MSL3. The inner box label confirms lead-free marking per JEDEC Standard JESD97.

ST26C31BDR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 16-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Driver

Protocol:: RS422, RS485

Number of Drivers/Receivers:: 4/0

Duplex:: -

Receiver Hysteresis:: -

Data Rate:: -

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SO

ST26C31BDR FAQ

1.How can I place an order for ST26C31BDR through Aetrix?

Please submit a Request for Quotation (RFQ) for ST26C31BDR 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 ST26C31BDR reliable?

The price and inventory of ST26C31BDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST26C31BDR is usually 5 days.

3.What payment methods are accepted for ST26C31BDR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST26C31BDR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ST26C31BDR?

ST26C31BDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ST26C31BDR 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 ST26C31BDR?

For technical support, including ST26C31BDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST26C31BDR requirements.

6.How does Aetrix verify that ST26C31BDR is sourced from the original manufacturer or authorized distributors?

All ST26C31BDR 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 ST26C31BDR meets industry standards.

7.What is the process for return or replacement of ST26C31BDR?

All ST26C31BDR units undergo pre-shipment inspection (PSI). If there is an issue with ST26C31BDR, 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 ST26C31BDR part is unused and in its original packaging.

Return procedure for ST26C31BDR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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