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STMicroelectronics ST26C32ABTR
- Part No.:
- ST26C32ABTR
- Manufacturer:
- STMicroelectronics
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ST26C32ABTR.pdf
- Description:
- IC TRANSCEIVER 0/4 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:21,501
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Product details
Overview
ST26C32ABTR from STMicroelectronics is a CMOS quad 3-state differential line receiver compliant with RS-422 and RS-423 standards, featuring ±200 mV input sensitivity over ±7 V common-mode range, 19 ns typical propagation delay, 60 mV input hysteresis, and 6 mA output drive capability. It enables robust digital data transmission in industrial serial buses and multi-drop communication systems.
For engineers reviewing the ST26C32ABTR datasheet, ST26C32ABTR pinout, ST26C32ABTR application, or ST26C32ABTR equivalent, key selection criteria include differential input threshold stability across temperature, 3-state bus interface compatibility, enable-controlled channel isolation, and TSSOP16 footprint suitability for high-density PCB layouts.
Technical Context
The ST26C32ABTR implements four independent differential receivers with shared dual-enable control (pins 4 and 12), each supporting balanced RS-422 inputs and unbalanced RS-423 inputs. Its internal pull-up/pull-down resistors suppress floating outputs on unused channels, eliminating external biasing components.
It operates from 4.5 V to 5.5 V supply, delivers 10–20 Mbits/s data rate under 50 pF load, and maintains functional integrity with input common-mode voltage spanning –7 V to +7 V - critical for noise-immune long-line reception in factory automation and motor control networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V logic domains and tolerance against rail droop in noisy industrial environments |
| Input Sensitivity | ±200 mV - guarantees reliable detection of small differential signals even under ±7 V common-mode offset |
| Propagation Delay | 19 ns typical - supports >10 Mbits/s serial data rates with timing margin for synchronous bus arbitration |
| Output Drive | ±6 mA - sufficient to drive 50 pF loads at full speed while maintaining TTL/CMOS logic levels |
| Input Hysteresis | 60 mV - prevents chatter during slow-rising or noisy differential transitions, improving noise immunity |
| Enable Propagation | 13–23 ns (tPZH/tPHZ) - enables precise time-gated receiver activation in time-sliced multiplexed systems |
| Quiescent Current | 16–23 mA - reflects low-power CMOS design suitable for always-on serial monitoring nodes |
Pinout & Package
TSSOP16 package: 5.0 mm × 6.4 mm body, 0.65 mm pitch, 1.2 mm height, lead-free and RoHS-compliant per ECOPACK2 specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 6, 7, 9, 10, 14, 15 | Differential Input Pairs (A1/A2, B1/B2, C1/C2, D1/D2) | Accept balanced RS-422 or single-ended RS-423 signals; internally terminated with hysteresis and common-mode range support |
| 3, 5, 11, 13 | 3-State Outputs (AOUT, BOUT, COUT, DOUT) | Active-high CMOS outputs with ±6 mA drive; enter high-impedance state when respective EN = L |
| 4, 12 | Enable Inputs (EN) | Active-high control lines - both must be high to enable all four receivers; independent gating not supported |
| 8 | GND | Signal and power ground reference for all receiver stages and output drivers |
| 16 | VCC | 5 V supply rail powering all four receivers and output buffers |
Key Features
| Feature | Design Value |
|---|---|
| RS-422/RS-423 Compliance | Fully meets EIA-422B and EIA-423B electrical requirements for differential and unbalanced line reception |
| Zero-Load Input at VCC = 0 V | Inputs present no loading to bus when power is off - enables hot-swap and partial-power-down system architectures |
| Internal Bias Resistors | Pull-up/pull-down network prevents oscillation on unused channels without external components |
| Low-Power CMOS Design | 23 mA max ICC at 5.5 V enables use in thermally constrained enclosures and battery-backed interfaces |
| High Common-Mode Rejection | Operates reliably with ±7 V input common-mode range - essential for ground-loop tolerant fieldbus installations |
Applications
| Industrial PLC Backplane | Factory Automation Serial Bus |
|---|---|
Use Scenario: Multi-node RS-422 daisy-chain on modular I/O rack backplane with shared ground and variable cable lengths. IC Role / Device Role / Timing Role: Differential line receiver converting twisted-pair signals to clean CMOS logic for FPGA or microcontroller input capture. Use Value: ±200 mV sensitivity and 60 mV hysteresis ensure error-free decoding despite induced noise and impedance mismatches up to 100 m. | Use Scenario: Central motion controller communicating with distributed servo drives via point-to-point RS-422 links. IC Role / Device Role / Timing Role: High-speed receiver front-end enabling 15 Mbits/s command stream synchronization with sub-20 ns timing uncertainty. Use Value: 19 ns typical propagation delay and 4 ns rise/fall times preserve signal integrity across 30 m shielded cables. |
| Motor Drive Feedback Interface | Energy Meter Communication Module |
Use Scenario: Isolated encoder signal conditioning where differential A/B/Z tracks are received across galvanic barriers. IC Role / Device Role / Timing Role: Robust differential receiver handling ±7 V common-mode offsets induced by motor switching transients. Use Value: ±7 V common-mode range and internal hysteresis eliminate false edge detection during high-dv/dt events near inverters. | Use Scenario: AMR/AMI meter using RS-423-compatible optical port for utility-side firmware updates and diagnostics. IC Role / Device Role / Timing Role: Single-ended line receiver interfacing legacy optical head with microcontroller UART input. Use Value: RS-423 compliance and 0.8 V/2.0 V enable thresholds ensure interoperability with low-power IRDA-style transceivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad differential receiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN65LBC174APWR | Higher supply range (4.75–5.25 V), lower hysteresis (35 mV), no internal bias resistors | Requires external termination; less tolerant of slow edges and EMI in unshielded environments | Preferred where tighter supply regulation exists and board space allows discrete biasing |
| MAX3082ESA+ | Lower quiescent current (1.2 mA), no dual-enable architecture, single EN pin only | Lacks independent channel enable grouping; unsuitable for synchronized multi-receiver gating | Chosen for ultra-low-power remote sensors but incompatible with ST26C32ABTR's dual-EN timing control |
Compared with SN65LBC174APWR and MAX3082ESA+, the ST26C32ABTR uniquely combines dual-enable control, internal biasing, and ±200 mV sensitivity - making it optimal for deterministic multi-channel enable sequencing in industrial backplanes.
Availability
ST26C32ABTR is available at Aetrix Electronics and suitable for industrial PLC backplanes, factory automation serial buses, motor drive feedback interfaces, and energy meter communication modules requiring stable component supply across extended temperature ranges.
Supply support for ST26C32ABTR 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 analog, MCU, power, and sensor solutions for automotive, industrial, and consumer markets.
The ST26C32ABTR belongs to ST's industrial interface IC portfolio, engineered specifically for noise-immune, high-reliability differential data reception in harsh electromagnetic environments such as factory floors and power distribution systems.
FAQ
Can ST26C32ABTR operate with a 3.3 V supply?
No. The ST26C32ABTR is specified for 4.5 V to 5.5 V operation only. At 3.3 V, input thresholds, output drive strength, and propagation delay fall outside guaranteed limits per Table 5 and Table 6 of the datasheet. Use ST3485 or MAX3485 for true 3.3 V RS-485/RS-422 receivers.
What is the function of pins 4 and 12 labeled "EN"?
Pins 4 and 12 are identical active-high enable inputs tied together internally. Both must be driven high (≥2.0 V) to activate all four receivers; pulling either low disables all outputs into high-impedance state. They are not independent channel controls.
Does ST26C32ABTR support RS-485 half-duplex bus operation?
No. The ST26C32ABTR is a receiver-only device with no driver functionality or DE/RE control logic. It supports RS-422/RS-423 reception only. For RS-485 transceivers, consider ST3485 or SP3485.
How does the internal hysteresis improve noise immunity?
The 60 mV input hysteresis creates distinct turn-on and turn-off thresholds, preventing multiple output transitions during slow or noisy differential signal crossings. This eliminates false triggering on EMI-induced ringing or ground bounce in long-cable industrial deployments.
ST26C32ABTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Receiver
- Protocol:
- RS422, RS423
- Number of Drivers/Receivers:
- 0/4
- Duplex:
- -
- Receiver Hysteresis:
- 60 mV
- Data Rate:
- 20Mbps
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
ST26C32ABTR FAQ
1.How can I place an order for ST26C32ABTR through Aetrix?
Please submit a Request for Quotation (RFQ) for ST26C32ABTR 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 ST26C32ABTR reliable?
The price and inventory of ST26C32ABTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST26C32ABTR is usually 5 days.
3.What payment methods are accepted for ST26C32ABTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST26C32ABTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST26C32ABTR?
ST26C32ABTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST26C32ABTR 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 ST26C32ABTR?
For technical support, including ST26C32ABTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST26C32ABTR requirements.
6.How does Aetrix verify that ST26C32ABTR is sourced from the original manufacturer or authorized distributors?
All ST26C32ABTR 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 ST26C32ABTR meets industry standards.
7.What is the process for return or replacement of ST26C32ABTR?
All ST26C32ABTR units undergo pre-shipment inspection (PSI). If there is an issue with ST26C32ABTR, 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 ST26C32ABTR part is unused and in its original packaging.
Return procedure for ST26C32ABTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ST26C32ABTR Tags
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