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Texas Instruments UA9638ACDR
- Part No.:
- UA9638ACDR
- Manufacturer:
- Texas Instruments
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UA9638ACDR.pdf
- Description:
- IC TRANSCEIVER 2/0 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,687
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Product details
Overview
UA9638ACDR from Texas Instruments is a dual high-speed differential line driver compliant with EIA/TIA-422-B, operating from a single 5V supply, driving 50Ω loads at up to 15Mbps, with TTL/CMOS-compatible inputs and output short-circuit protection - used in factory automation data links.
For engineers reviewing the UA9638ACDR datasheet, UA9638ACDR pinout, UA9638ACDR application, or UA9638ACDR equivalent, key selection criteria include differential output voltage magnitude (≥2V), propagation delay (≤20ns), thermal resistance (116.7°C/W for SOIC), and SOIC-8 package compatibility with industrial temperature range (0°C to 70°C).
Technical Context
The UA9638ACDR implements two independent EIA/TIA-422-B-compliant drivers using Schottky-diode-clamped transistors to minimize propagation delay. Each channel accepts single-ended TTL/CMOS inputs and delivers complementary differential outputs (1Y/1Z and 2Y/2Z) with defined common-mode voltage (3V) and differential swing (≥2V).
It operates exclusively from a 4.75V–5.25V supply, supports continuous output current up to ±50mA per channel, and features input clamp diodes and internal short-circuit protection - no enable/disable control or slew-rate adjustment is provided.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75V to 5.25V - ensures stable operation across standard 5V rail tolerances without regulation overhead |
| Differential Output Voltage | ≥2V (min) - meets EIA/TIA-422-B minimum swing for noise-immune long-line transmission |
| Max Data Rate | 15Mbps - enables high-speed serial communication over twisted-pair cabling in industrial networks |
| Propagation Delay | 10ns to 20ns - supports precise timing alignment in synchronous multi-channel systems |
| Output Skew | ≤1ns - maintains inter-channel timing integrity critical for parallel bus or dual-signal applications |
| Thermal Resistance θJA | 116.7°C/W (SOIC-8) - defines maximum power dissipation (464mW at 70°C ambient) without heatsink |
| Operating Temperature | 0°C to 70°C - qualified for commercial/industrial environments excluding extended-temperature use |
Pinout & Package
UA9638ACDR is supplied in an 8-pin SOIC (D) package measuring 4.9mm × 6mm with 1.27mm lead pitch and 1.75mm max height - compatible with standard surface-mount assembly and IPC-7351 land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Power Supply Input | 5V positive rail connection; decoupling capacitor must be placed within 5mm for stability |
| 1A (Pin 2) | Input | Single-ended data input for Channel 1; TTL/CMOS logic levels accepted |
| 2A (Pin 3) | Input | Single-ended data input for Channel 2; electrically isolated from Channel 1 |
| GND (Pin 4) | Ground Reference | Common return path for supply and signal; requires low-inductance PCB connection |
| 2Z (Pin 5) | Output | Inverting differential output for Channel 2; paired with 2Y to form EIA-422 compliant pair |
| 2Y (Pin 6) | Output | Non-inverting differential output for Channel 2; drives one side of twisted-pair load |
| 1Z (Pin 7) | Output | Inverting differential output for Channel 1; referenced to 1Y for differential signaling |
| 1Y (Pin 8) | Output | Non-inverting differential output for Channel 1; provides full swing relative to 1Z |
Key Features
| Feature | Design Value |
|---|---|
| EIA/TIA-422-B Compliance | Guarantees interoperability with industry-standard differential receivers like UA9637A in noise-prone environments |
| 50Ω Load Drive Capability | Enables direct interface to terminated RS-422-style transmission lines without external buffering |
| Input Clamp Diodes | Protects against transient overvoltage on 1A/2A inputs up to −1.2V, reducing need for external TVS |
| Short-Circuit Output Protection | Limits fault current to −50mA to −150mA per output, preventing latch-up during wiring errors |
| SOIC-8 Thermal Performance | 116.7°C/W junction-to-ambient rating allows 464mW max power at 70°C ambient without derating |
Applications
| Factory Automation Data Link | ATM Cash Counter Interface |
|---|---|
Use Scenario: High-noise PLC-to-HMI communication over 30m twisted-pair cabling in manufacturing cells. IC Role / Device Role / Timing Role: Dual-channel differential driver converting TTL-level controller outputs into robust EIA-422 signals. Use Value: 15Mbps capability supports real-time status updates; 1ns skew preserves synchronization between control and feedback channels. | Use Scenario: Secure banknote validation module transmitting sensor data to central processor across chassis boundaries. IC Role / Device Role / Timing Role: Isolates sensitive cash-counting logic from noisy motor drive sections via differential signaling. Use Value: ≥2V differential swing ensures >10dB noise margin against EMI from solenoid actuators and coin transport mechanisms. |
| Smart Grid Substation Comms | AC Servo Motor Feedback Loop |
Use Scenario: IED-to-RTU telemetry link in outdoor substations subject to lightning-induced ground potential rise. IC Role / Device Role / Timing Role: Transmits time-stamped relay status and metering data using balanced differential pairs. Use Value: Common-mode output voltage (3V) and ±0.4V variation enable reliable reception despite ground shifts up to ±2V. | Use Scenario: Encoder position data transmission from servo motor to motion controller in CNC machinery. IC Role / Device Role / Timing Role: Converts quadrature encoder A/B signals into noise-immune differential streams. Use Value: 20ns max transition time preserves edge integrity at 1MHz encoder frequencies, minimizing position jitter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential line driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS9638MX/NOPB | Pin-compatible, identical pinout and electrical specs; same SOIC-8 package and 0°C–70°C range | No functional distinction - direct second-source option with identical timing and drive strength | Select when dual-sourcing is required or TI supply constraints exist |
| SN75ALS191D | Faster switching (12ns typ td), higher VOD (≥2.5V), but requires 4.75V–5.25V supply and lacks input clamp diodes | Better for >20Mbps designs; unsuitable where input overvoltage protection is mandatory | Choose for speed-critical links where external clamping is already implemented |
Compared with DS9638MX/NOPB, UA9638ACDR offers identical functionality and drop-in replacement capability; versus SN75ALS191D, it trades 3ns lower propagation delay for integrated input protection and guaranteed EIA-422-B compliance at 15Mbps.
Availability
UA9638ACDR is available at Aetrix Electronics and suitable for factory automation data links, ATM cash counter interfaces, smart grid substation communications, and AC servo motor feedback loops requiring stable component supply across production lifecycles.
Supply support for UA9638ACDR 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The UA9638ACDR belongs to TI's legacy line driver portfolio designed specifically for robust, low-cost EIA/TIA-422-B compliant data transmission in industrial control and instrumentation systems.
FAQ
What is the maximum data rate supported by the UA9638ACDR?
The UA9638ACDR supports up to 15Mbps under standard operating conditions (VCC = 5V, TA = 25°C, RL = 100Ω). This performance is verified in the switching characteristics table (Section 5.6) and confirmed by application examples in factory automation and smart grid telemetry where signal integrity is maintained over twisted-pair cables up to 30 meters. The UA9638ACDR achieves this using Schottky-clamped transistor design to minimize propagation delay.
Does the UA9638ACDR require external components for basic operation?
Yes - the UA9638ACDR requires a 0.1µF ceramic bypass capacitor between VCC (Pin 1) and GND (Pin 4), placed within 5mm of the device, to suppress supply noise and ensure stable high-speed operation. No pull-up/pull-down resistors are needed on inputs (1A/2A) due to TTL/CMOS compatibility, and no termination resistors are integrated - external 100Ω differential termination is recommended at the receiver end per EIA/TIA-422-B.
Is the UA9638ACDR pin-compatible with other TI line drivers?
Yes - the UA9638ACDR shares identical pinout and function mapping with DS9638MX/NOPB, making it a direct second-source replacement. It is not pin-compatible with SN75ALS191D despite similar SOIC-8 packaging, as SN75ALS191D reassigns Pin 4 (GND) and Pin 5 (2Z) functions and lacks input clamp diodes. Always verify pin configuration using Figure 4-1 in the UA9638ACDR datasheet before board reuse.
What thermal considerations apply to the UA9638ACDR in SOIC-8 package?
The UA9638ACDR in SOIC-8 has a junction-to-ambient thermal resistance (θJA) of 116.7°C/W. At maximum rated ambient temperature (70°C), its usable power dissipation is limited to 464mW (per Section 5.2). To stay within safe operating area, keep total supply current below 65mA (ICC max) and avoid sustained short-circuit conditions. PCB copper pour under the exposed pad is not applicable - thermal relief relies on standard SOIC trace routing and board layer stackup.
Can the UA9638ACDR drive unterminated transmission lines?
No - the UA9638ACDR is designed for controlled-impedance differential transmission and requires proper termination to prevent signal reflections. Driving unterminated lines causes overshoot, ringing, and bit errors above ~1Mbps. For 50Ω or 100Ω twisted-pair cabling, place a 100Ω resistor across the differential pair (e.g., between 1Y and 1Z) at the receiver end. The UA9638ACDR's output stage is optimized for loaded conditions, not open-circuit or high-Z loads.
UA9638ACDR 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:
- Driver
- Protocol:
- RS422, RS485
- Number of Drivers/Receivers:
- 2/0
- Duplex:
- -
- Receiver Hysteresis:
- -
- 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
UA9638ACDR FAQ
1.How can I place an order for UA9638ACDR through Aetrix?
Please submit a Request for Quotation (RFQ) for UA9638ACDR 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 UA9638ACDR reliable?
The price and inventory of UA9638ACDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UA9638ACDR is usually 5 days.
3.What payment methods are accepted for UA9638ACDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UA9638ACDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UA9638ACDR?
UA9638ACDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UA9638ACDR 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 UA9638ACDR?
For technical support, including UA9638ACDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UA9638ACDR requirements.
6.How does Aetrix verify that UA9638ACDR is sourced from the original manufacturer or authorized distributors?
All UA9638ACDR 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 UA9638ACDR meets industry standards.
7.What is the process for return or replacement of UA9638ACDR?
All UA9638ACDR units undergo pre-shipment inspection (PSI). If there is an issue with UA9638ACDR, 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 UA9638ACDR part is unused and in its original packaging.
Return procedure for UA9638ACDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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