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Texas Instruments UA9637ACDR
- Part No.:
- UA9637ACDR
- Manufacturer:
- Texas Instruments
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UA9637ACDR.pdf
- Description:
- IC TRANSCEIVER 0/2 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:9,414
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Product details
Overview
UA9637ACDR from Texas Instruments is a dual differential line receiver compliant with EIA/TIA-422-B, EIA/TIA-423-B, ITU V.10, and V.11 standards; operates from a single 5V ±5% supply; features TTL-compatible outputs, ±7V common-mode input range, and 25ns typical propagation delay; used in factory automation and motor drive interfaces.
For engineers reviewing the UA9637ACDR datasheet, UA9637ACDR pinout, UA9637ACDR application, or UA9637ACDR equivalent, this page delivers verified electrical specs, SOIC-8 package details, functional pin roles, real-world implementation context, and two validated alternative receivers for industrial serial interface design.
Technical Context
The UA9637ACDR implements two independent Schottky-clamped differential receivers with hysteresis (70mV), enabling robust noise immunity in electrically noisy environments. Each channel accepts either single-ended or differential inputs and delivers TTL-level outputs without external pull-ups.
It supports wide common-mode voltage operation (±7V) and maintains defined logic states across VID thresholds of −0.4V (VIT−) and +0.4V (VIT+), with indeterminate output only within the narrow −0.01V to +0.01V transition band per functional table.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75V to 5.25V - ensures stable TTL-level output swing and timing performance under standard 5V rail tolerances |
| Common-Mode Input Range | ±7V - enables direct interfacing with long-line RS-422/RS-423 transceivers and industrial field wiring |
| Propagation Delay | 13–25ns - supports data rates up to ~30 Mbps in point-to-point links with tight timing budgets |
| Input Hysteresis | 70mV - suppresses false triggering from EMI-induced input noise on unterminated or stubbed lines |
| Output Drive | 20mA sink / 1mA source - directly drives TTL loads and standard logic inputs without buffering |
| Operating Temperature | 0°C to 70°C - qualified for commercial-industrial ambient conditions in factory-floor control systems |
| Input Impedance | ≥1.1kΩ - minimizes loading on upstream differential drivers while maintaining signal integrity |
Pinout & Package
UA9637ACDR is supplied in an 8-pin SOIC (D) package measuring 4.9mm × 6mm with 1.27mm lead pitch and 1.75mm max height; RoHS-compliant, NIPDAU finish, MSL Level-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Positive Supply | 5V ±5% power input; decoupling capacitor must be placed within 10mm for stable high-speed operation |
| 1OUT | Channel 1 Output | TTL-compatible single-ended output; sinks 20mA or sources 1mA at defined VOH/VOL levels |
| 2OUT | Channel 2 Output | Independent TTL output; electrically isolated from 1OUT-no crosstalk in shared load scenarios |
| GND | Ground Reference | Signal and power return path; must connect to low-impedance system ground plane near device |
| 2IN− / 2IN+ | Channel 2 Differential Inputs | Inverting/non-inverting inputs for second receiver; accept ±15V differential and ±7V common-mode voltages |
| 1IN− / 1IN+ | Channel 1 Differential Inputs | First receiver pair; identical electrical characteristics to 2IN−/2IN+; supports independent line termination |
Key Features
| Feature | Design Value |
|---|---|
| EIA/TIA-422-B & 423-B Compliance | Fully meets ANSI standard electrical interface requirements for balanced differential receivers in industrial networks |
| Single 5V Operation | Eliminates need for dual-rail supplies; simplifies power architecture in PLC I/O modules and servo controllers |
| High Input Impedance | Reduces current draw from upstream drivers-critical for multi-drop bus topologies with >10 receivers |
| TTL-Compatible Outputs | Directly interfaces with 74LS, 74HC, and microcontroller GPIO without level-shifting or pull-up resistors |
| Schottky Circuitry | Enables fast switching (25ns typ.) and prevents saturation delay-essential for high-throughput motion control loops |
Applications
| Factory Automation Interface | AC Motor Drive Feedback |
|---|---|
|
Use Scenario: Receiving encoder quadrature signals and digital I/O status from remote I/O racks over twisted-pair cabling in noisy plant environments. IC Role / Device Role / Timing Role: Dual differential line receiver converting balanced RS-422 signals into TTL logic levels for PLC CPU input capture. Use Value: ±7V common-mode range rejects ground-loop noise; 70mV hysteresis prevents chatter on slow-rising encoder edges. |
Use Scenario: Isolating and conditioning position feedback and fault signals from AC inverter drives connected via industrial fieldbus. IC Role / Device Role / Timing Role: Signal-level translator between high-voltage motor control boards and low-voltage logic subsystems. Use Value: 25ns propagation delay preserves timing alignment in closed-loop torque control; SOIC-8 footprint fits compact drive PCB layouts. |
| Servo System Command Link | Legacy Industrial Bus Receiver |
|
Use Scenario: Decoding command pulses and direction signals sent from motion controller to servo amplifier over differential pair wiring. IC Role / Device Role / Timing Role: High-speed differential receiver ensuring deterministic edge detection for precise position tracking. Use Value: TTL outputs drive FPGA input registers directly; 20mA sink capability handles capacitive loads up to 30pF without degradation. |
Use Scenario: Replacing obsolete line receivers in legacy CNC machine tool controllers using EIA-423 analog signaling. IC Role / Device Role / Timing Role: Drop-in functional replacement for DS9637A in existing schematics and PCB footprints. Use Value: Pin-compatible with National Semiconductor DS9637A; same SOIC-8 layout and thermal profile (RθJA = 116.7°C/W). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual differential receiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN65LBC175DR | 3.3V-only supply; higher ESD rating (±15kV HBM); 30ns max tPHL/tPLH | Requires level-shifting when interfacing with 5V logic; better suited for modern low-voltage industrial gateways | Select when upgrading to 3.3V systems or requiring enhanced ESD robustness beyond UA9637ACDR's specification |
| DS9637AMX | Same 5V operation and pinout; wider temp range (−40°C to 85°C); higher ICC (65mA max) | Supports extended temperature deployment in uncontrolled enclosures; higher supply current impacts thermal budget | Choose for harsher ambient conditions where UA9637ACDR's 0°C–70°C range is insufficient |
Compared with SN65LBC175DR and DS9637AMX, the UA9637ACDR offers optimal balance of 5V compatibility, proven industrial reliability, and cost-effective SOIC-8 packaging-making it ideal for retrofitting legacy 5V motion control and factory automation hardware without board redesign.
Availability
UA9637ACDR is available at Aetrix Electronics and suitable for factory automation, AC motor drives, and servo system designs requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant sourcing.
Supply support for UA9637ACDR 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies for industrial, automotive, and communications markets.
The UA9637ACDR belongs to TI's legacy industrial interface portfolio, designed specifically for robust, low-cost differential signal reception in factory-floor control systems and motor drive applications.
FAQ
What standards does the UA9637ACDR comply with?
The UA9637ACDR meets or exceeds ANSI/EIA/TIA-422-B and EIA/TIA-423-B standards, as well as ITU Recommendations V.10 and V.11. These define electrical characteristics for balanced differential receivers used in industrial serial communication. Compliance is verified per TI's SLLS111C datasheet test conditions and applies directly to the UA9637ACDR in both SOIC and PDIP packages.
Can the UA9637ACDR operate from a 3.3V supply?
No-the UA9637ACDR is specified only for 4.75V to 5.25V operation. Attempting to power the UA9637ACDR from 3.3V will result in undefined output behavior, failure to meet VOH/VOL specifications, and potential violation of absolute maximum ratings. For 3.3V systems, consider TI's SN65LBC175DR as a documented alternative.
Is the UA9637ACDR pin-compatible with the DS9637A?
Yes-the UA9637ACDR is explicitly designed to be interchangeable with National Semiconductor's DS9637A. Both share identical pin configuration (SOIC-8 or PDIP-8), function mapping, and recommended operating conditions. TI confirms this interchangeability in the device description and features list of the UA9637ACDR datasheet.
What is the maximum differential input voltage the UA9637ACDR can withstand?
The UA9637ACDR supports a differential input voltage (VID) range of ±15V, as stated in its Absolute Maximum Ratings table. This allows safe operation with large signal swings encountered in long-cable industrial installations-even when transient surges occur-without damage to internal Schottky circuitry.
Does the UA9637ACDR require external pull-up resistors on its outputs?
No-the UA9637ACDR provides TTL-compatible outputs with active pull-up capability (VOH ≥ 2.5V at –1mA) and strong pull-down (VOL ≤ 0.35V at 20mA). External pull-ups are unnecessary and may interfere with guaranteed VOL performance. The UA9637ACDR drives standard TTL loads directly.
UA9637ACDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Receiver
- Protocol:
- RS422, RS423
- Number of Drivers/Receivers:
- 0/2
- Duplex:
- -
- Receiver Hysteresis:
- 70 mV
- Data Rate:
- -
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
UA9637ACDR FAQ
1.How can I place an order for UA9637ACDR through Aetrix?
Please submit a Request for Quotation (RFQ) for UA9637ACDR 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 UA9637ACDR reliable?
The price and inventory of UA9637ACDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UA9637ACDR is usually 5 days.
3.What payment methods are accepted for UA9637ACDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UA9637ACDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UA9637ACDR?
UA9637ACDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UA9637ACDR 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 UA9637ACDR?
For technical support, including UA9637ACDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UA9637ACDR requirements.
6.How does Aetrix verify that UA9637ACDR is sourced from the original manufacturer or authorized distributors?
All UA9637ACDR 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 UA9637ACDR meets industry standards.
7.What is the process for return or replacement of UA9637ACDR?
All UA9637ACDR units undergo pre-shipment inspection (PSI). If there is an issue with UA9637ACDR, 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 UA9637ACDR part is unused and in its original packaging.
Return procedure for UA9637ACDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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