AM26C31IDR - Quad RS-422 Diff Line Driver 16-SOIC | Texas Instruments
料号： AM26C31IDR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $1.1 | $1.10 |
| 10 | $0.92 | $9.20 |
| 100 | $0.74 | $74.00 |
| 500 | $0.58 | $290.00 |
| 1,000 | $0.47 | $470.00 |
| 2,500 | $0.39 | $975.00 |
AM26C31IDR 概述
Key features include ±60 mA output drive current on each channel, low supply current of 100 µA typical in disabled state, thermal shutdown protection, and complementary output pairs per driver for flexible termination topologies. The wide -40°C to +85°C industrial operating temperature range suits factory automation, building controls, and process instrumentation environments.
An RS-422 line driver (also called a quadruple differential transmitter) is one of the standard building blocks in the EIA/TIA-422 balanced-voltage digital interface family. It converts a single-ended TTL/CMOS logic input into a differential pair (+Y, -Y) capable of driving long cables with strong common-mode noise rejection. RS-422 sits in a hierarchy of digital interfaces: line driver -> differential transceiver -> serial interface IC -> interface IC -> semiconductor. Compared to single-ended interfaces (RS-232, LVTTL), RS-422 supports multi-drop topologies and longer cable runs, making it the interface of choice for industrial fieldbuses, point-of-sale terminals, and motor-control feedback links.
The AM26C31IDR uses a CMOS process that delivers the same electrical functionality as the classic AM26LS31 bipolar driver with substantially reduced power dissipation. Internal thermal-shutdown circuitry disables the outputs when the die temperature exceeds safe limits, protecting the device against bus contention faults. Each driver has dedicated TTL/CMOS-compatible input plus true and inverted 3-state outputs, allowing half-duplex multi-drop wiring when paired with the companion AM26C32 receiver.
Typical applications include factory-floor RS-422 multidrop networks, CNC machine controller linkages, building-automation HVAC and access-control wiring, and point-to-point serial links to motion encoders. The 16-pin SOIC narrow-body footprint balances ease of hand-soldering in prototypes with high-density routing on production boards.
When designing with the AM26C31IDR, place a 0.1 µF decoupling capacitor within 5 mm of the VCC pin and keep the differential pair traces length-matched to within 5 mm to maintain signal integrity at the maximum 10 Mbps signaling rate. Use a 100 Ω termination resistor across each differential pair at the receiver end to suppress reflections on cables longer than 1 m.
This page synthesizes distributor pricing, drop-in alternatives (same-brand first, then cross-brand), and practical design notes not found on individual DigiKey, Mouser, or Octopart listings - giving an engineer everything needed to select, source, and implement the AM26C31IDR in one place.
直接替换替代料： AM26C31IDR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
AM26C31CDR
✅ 直接替换📋 参考替代料（不在目录中）
AM26C31QDR
✅ 直接替换📋 参考替代料（不在目录中）
AM26C31INSR
✅ 直接替换📋 参考替代料（不在目录中）
MC3487DR2G
✅ 直接替换📋 参考替代料（不在目录中）
DS26C31TM/NOPB
✅ 直接替换📋 参考替代料（不在目录中）
AM26C31IDR 规格参数
| Product Type | Quadruple Differential Line Driver |
| Number of Drivers | 4 |
| Protocol | RS-422 / TIA-EIA-422-B / ITU V.11 |
| Data Rate (max) | 10 Mbps |
| Supply Voltage (Vcc) | 4.5 V to 5.5 V |
| Supply Current (Vcc) - disabled | 100 µA typical |
| Output Drive Current | ±60 mA per channel |
| 输出类型 | Differential, complementary, 3-state |
| 工作温度 | -40 °C to +85 °C |
| Input Logic Compatibility | TTL / CMOS |
| 封装 | 16-pin SOIC (D), narrow body, 1.27 mm pitch |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant (Pb-free) |
| 热关断 | Yes (internal) |
| Enable / Shutdown Pin | Yes (active-high EN per channel pair) |
AM26C31IDR 引脚配置
| 引脚 1 | 1A — Driver 1 input (TTL/CMOS) |
| 引脚 2 | 1Y — Driver 1 non-inverting output |
| 引脚 3 | 1Z — Driver 1 inverting output |
| 引脚 4 | EN1,2 — Enable for drivers 1 and 2 (active-high) |
| 引脚 5 | GND — Ground |
| 引脚 6 | 2Z — Driver 2 inverting output |
| 引脚 7 | 2Y — Driver 2 non-inverting output |
| 引脚 8 | 2A — Driver 2 input (TTL/CMOS) |
| 引脚 9 | 3A — Driver 3 input (TTL/CMOS) |
| 引脚 10 | 3Y — Driver 3 non-inverting output |
| 引脚 11 | 3Z — Driver 3 inverting output |
| 引脚 12 | GND — Ground |
| 引脚 13 | EN3,4 — Enable for drivers 3 and 4 (active-high) |
| 引脚 14 | 4Z — Driver 4 inverting output |
| 引脚 15 | 4Y — Driver 4 non-inverting output |
| 引脚 16 | VCC — Supply voltage (4.5 V to 5.5 V) |
典型应用
AM26C31IDR 适用于 6 应用s: Factory Automation RS-422 Fieldbus, Building Automation / HVAC Wiring, CNC Machine Controller Link, Point-of-Sale Terminal Networking, Encoder and Resolver Feedback Wiring, Industrial Sensor and Load-Cell Digitizer Link.
Factory Automation RS-422 Fieldbus
The AM26C31IDR drives four channels of TIA/EIA-422-B differential signaling used to interconnect PLCs, motor drives, and remote I/O blocks across a factory floor. Its ±60 mA drive current lets it source or sink the full RS-422 minimum of ±20 mA even into cables up to 1200 m, while the complementary outputs support both point-to-point and multi-drop topologies common in industrial fieldbus wiring. With industrial-grade -40 °C to +85 °C operation and TTL-compatible inputs, the device interfaces directly to 5 V microcontroller GPIO without level shifters, simplifying the BOM and lowering per-node cost in multi-drop PLC networks.
推荐
Building Automation / HVAC Wiring
The AM26C31IDR is well suited to BACnet MS-TP and proprietary RS-422 multidrop networks found in HVAC controls, access-control panels, and elevator controllers. Four drivers per package minimize PCB area and BOM cost versus discrete-driver alternatives, and the 10 Mbps ceiling comfortably covers the 115.2 kbps to 1 Mbps MS-TP baud rates used in commercial-building protocols. The CMOS low-power design (100 µA disabled current) keeps standby consumption low across the hundreds of nodes often installed in a single building automation panel array, simplifying thermal and power-supply design.
推荐
CNC Machine Controller Link
In CNC tooling machines the AM26C31IDR drives the RS-422 differential link between the motion controller and remote servo amplifiers or absolute encoder feedback units. The complementary outputs and 3-state control let the controller share the bus across multiple axes with controlled contention handling, while the 10 Mbps bandwidth accommodates real-time encoder streams and high-resolution position feedback. Internal thermal-shutdown protection prevents driver damage during cable faults that frequently occur in machine-shop environments, and the wide industrial temperature range survives the elevated ambient temperatures inside an enclosure.
推荐
Point-of-Sale Terminal Networking
The AM26C31IDR enables long-distance, noise-resistant serial connections between POS terminals, receipt printers, and back-office server cages in retail environments. RS-422 differential signaling withstands the high levels of EMI generated by neon lighting, electronic cash drawers, and switching power supplies found in retail floors, providing far better error-free range than single-ended RS-232. The 16-SOIC narrow-body package supports hand-rework and is suitable for the moderate production volumes of POS equipment. The 5 V single-supply design simplifies integration with retail-grade 5 V microcontroller subsystems without auxiliary rails.
推荐
Encoder and Resolver Feedback Wiring
Servo and stepper drive systems use the AM26C31IDR to transmit encoder quadrature, index, and serial-position data over differential pairs with strong noise immunity - critical in drives co-located with high-current PWM power stages. The 4 drivers per IC cover A, B, Z index, and serial encoder clock/data lines in a single 16-SOIC, and the 10 Mbps rate exceeds the bandwidth of all common industrial serial encoder protocols (Tamagawa, EnDat, SSI up to 5 MHz). Industrial -40 to +85 °C operation survives cabinet temperatures near drives, while the 3-state enable supports point-to-multi-point commissioning tooling.
推荐
Industrial Sensor and Load-Cell Digitizer Link
Weigh scales, pressure transmitters, and high-precision load-cell digitizers use the AM26C31IDR to drive RS-422 links back to a remote PLC or display instrument, exploiting the strong common-mode rejection to reject ground-shift noise across long cable runs. The 5 V operation interfaces cleanly to common 24-bit sigma-delta ADC front ends used in precision weighing, and the multi-driver package consolidates four channels into one chip for compact panel-mount instruments. CMOS power economy scales well in battery-backed weigh stations or remote solar-powered instrumentation where quiescent draw matters.
推荐
推荐产品汇总
工程参考数据： AM26C31IDR ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | AM26C31CDR | AM26C31QDR | AM26C31INSR | MC3487DR2G | DS26C31TM/NOPB |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | onsemi | Texas Instruments |
| Package | 16-SOIC (D) | 16-SOIC (D) - same | 16-SOIC (D) - same | 16-SOIC (NS) - same | 16-SOIC (D) - same | 16-SOIC (D) - same |
| Operating Temperature | -40 °C to +85 °C | 0 °C to +70 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.75 V to 5.25 V | 4.5 V to 5.5 V |
| Output Drive Current | ±60 mA | ±60 mA | ±60 mA | ±60 mA | ±48 mA | ±60 mA |
| Protocol | RS-422 / TIA-EIA-422-B | RS-422 / TIA-EIA-422-B | RS-422 / TIA-EIA-422-B | RS-422 / TIA-EIA-422-B | RS-422 / RS-423 | RS-422 / TIA-EIA-422-B |
| Lifecycle Status | active | last_time_buy | active | active | active | active |
关键差异点
- CMOS low-power design over legacy bipolar LS （对比 AM26LS31CDR)
- Quad driver in 16-SOIC saves PCB area （对比 MC3487DR2G (onsemi))
- Active in TI portfolio with broad distribution （对比 AM26C31CDR)
设计说明
Place a 0.1 µF X7R ceramic decoupling capacitor within 5 mm of pin 16 (VCC) and a bulk 4.7-10 µF tantalum or ceramic capacitor on the same VCC node. Connect pin 5 (GND) and pin 12 (GND) directly to the ground plane with two short vias each. Both ground pins must be electrically tied on the PCB - leaving one floating can cause output distortion at high data rates.
Route each differential pair (+Y/-Y) length-matched to within 5 mm to maintain signal integrity at the maximum 10 Mbps signaling rate. Keep characteristic impedance at 100 Ω differential by using a 4-6 mil microstrip separated by 8-10 mil over a solid ground plane. Place a 100 Ω termination resistor across each differential pair at the receiver end of cables longer than 1 m to suppress reflections. Avoid routing differential pairs near switching converters or digital clocks; the AM26C31IDR has good common-mode rejection but radiated EMI from 10 Mbps edges can couple into nearby traces.
Do not exceed the VCC supply range of 4.5 V to 5.5 V - operation outside this window can cause output-driver shoot-through and permanent damage. Tie unused driver inputs to VCC or GND through 1 kΩ resistors rather than leaving them floating to prevent unwanted output toggling. The enable pins (EN1,2 and EN3,4) must be driven to a logic level rather than left floating for the same reason. For cables longer than 1200 m, derate the data rate linearly or add repeaters, since TIA/EIA-422-B limits total cable length to that figure at any signaling rate. Estimated rise time of driver outputs is approximately 5 ns; pair with an AM26C32IDR receiver rated for the same edge speed to avoid duty-cycle distortion.
合规信息
RoHS compliant and Pb-free per TI AM26C31 product page. Halogen-free per TI material declaration. Not AEC-Q100 qualified - not intended for automotive applications.
