LT1030CD - Quad RS-232 Line Driver 14-SOIC | Texas Instruments
料号： LT1030CD ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $2.95 | $2.95 |
| 10 | $2.65 | $26.50 |
| 100 | $2.32 | $232.00 |
| 500 | $1.95 | $975.00 |
| 1,000 | $1.62 | $1,620.00 |
LT1030CD 概述
A line driver is a type of interface IC that converts internal logic-level signals (typically 0/5V TTL or 0/3.3V CMOS) into the higher-voltage levels required by transmission standards such as EIA/TIA-232-F (RS-232). Line drivers sit in the signal chain hierarchy between digital logic and physical connectors, and together with line receivers they form transceivers that enable robust serial communication across cables. The LT1030 is a driver-only device, so designers pair it with an external receiver (such as the SN75C189) to complete an RS-232 link.
Key features include ±30V externally-applied voltage tolerance on outputs (with current limiting), 10 mA output drive capability, and outputs that swing within 200 mV of the positive supply and within 1 V of the negative supply to maximize headroom on low-voltage rails. The three-state (open when off) outputs allow several LT1030 devices to be connected in parallel on the same bus for higher drive strength or redundancy.
The LT1030C variant is characterized for operation from 0°C to 70°C, in a plastic SOIC-14 (D) package with NiPdAu lead finish. The device also meets or exceeds the EIA/TIA-232-F specification, and can be used as a micropower interface or level translator in addition to its primary RS-232 driver role.
Typical applications include portable or battery-powered RS-232 links, micro-power serial ports, level translation between logic families, and parallel-bus drivers that share multiple devices on a single bus. When designing, confirm the receiver side of the link is rated for the same ±25V common-mode range required by the standard.
直接替换替代料： LT1030CD ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： LT1030CD （相同外形与封装尺寸） ——差异在于 Package, Function, Supply Voltage Range.
快速对比工具——选择替代料号进行并排对比：
LT1030CDG4
✅ 直接替换📋 参考替代料（不在目录中）
LT1030CDR
✅ 直接替换📋 参考替代料（不在目录中）
MAX202CD
✅ 直接替换✓ 有现货
$1.1781 / 个
查看数据手册 →LT1030CD 规格参数
| 功能 | Line Driver |
| Number of Drivers/Receivers | 4 / 0 |
| Protocol | EIA/TIA-232-F (RS-232) |
| Supply Voltage Range | ±5 V to ±15 V |
| Typical Supply Current | 500 µA |
| Shutdown Supply Current | 0 µA |
| Output Drive Current | 10 mA |
| Externally Applied Output Voltage Tolerance | ±30 V |
| Output Swing (positive rail) | Within 200 mV of V+ |
| Output Swing (negative rail) | Within 1 V of V- |
| 工作温度范围 | 0 °C to 70 °C |
| 封装 | 14-SOIC (D) |
| 引脚数 | 14 |
| 安装类型 | Surface Mount |
| Lead Finish | NiPdAu |
| 输出类型 | 3-State (open when off) |
| RoHS 状态 | Compliant |
LT1030CD 引脚配置
| 引脚 1 | 1A — Driver 1 input |
| 引脚 2 | V+ — Positive supply voltage |
| 引脚 3 | 2A — Driver 2 input |
| 引脚 4 | SHDN — Shutdown control (active high) |
| 引脚 5 | NC — Not connected (per datasheet) |
| 引脚 6 | NC — Not connected (per datasheet) |
| 引脚 7 | GND — Ground |
| 引脚 8 | 4Y — Driver 4 output |
| 引脚 9 | V- — Negative supply voltage |
| 引脚 10 | 3A — Driver 3 input |
| 引脚 11 | 3Y — Driver 3 output |
| 引脚 12 | 4A — Driver 4 input |
| 引脚 13 | 2Y — Driver 2 output |
| 引脚 14 | 1Y — Driver 1 output |
典型应用
LT1030CD 适用于 6 应用s: Battery-Powered RS-232 Serial Port, Level Translator Between Logic Families, Parallel-Bus Driver with Redundancy, Micropower Serial Communication Link, Industrial Control Serial Interface, Test and Measurement Equipment UART Link.
Battery-Powered RS-232 Serial Port
The LT1030CD is well-suited for battery-powered RS-232 ports because it draws only 500 µA typical supply current and can be shut down to zero supply current when the link is idle. Unlike an integrated RS-232 transceiver, the LT1030CD is a driver-only device, so the system designer pairs it with a low-power external receiver (such as the SN75C189) to complete the link. This split architecture lets each half be powered independently, which is critical in portable instruments that must extend battery life. The ±5V to ±15V supply range means the device can be powered directly from a ±12V rail or from a charge-pump-derived rail. Engineers typically use the shutdown (SHDN) pin on pin 4 to gate the supply current during sleep modes.
推荐
Level Translator Between Logic Families
The LT1030CD can serve as a bidirectional level translator between 0/5V TTL logic and the higher-voltage swings required by legacy equipment, because its outputs swing within 200 mV of the positive rail and within 1 V of the negative rail. This makes it ideal for interfacing modern microcontrollers (which use 0/3.3V or 0/5V CMOS levels) to industrial systems that still expect ±12V signaling. The 10 mA output drive current is sufficient for moderate-capacitance cables, and the 3-state outputs allow safe bus-sharing when multiple translators target the same node. Designers should add a pull-up/down on each output to define the idle state when the driver is disabled.
推荐
Parallel-Bus Driver with Redundancy
Because the LT1030CD outputs are three-state (open when off) and can be externally forced to ±30V without damage, several LT1030CD devices can have their outputs wired in parallel on a shared bus to provide redundant drive paths for fault-tolerant systems. The on-chip current limiter protects each output when it is forced outside its normal swing range, which is important when multiple drivers are temporarily enabled together. This topology is common in industrial backplane designs and safety-critical communication buses where a single driver failure must not bring down the bus. Only one driver should be enabled at a time; the rest remain in the high-impedance state via the SHDN pin.
推荐
Micropower Serial Communication Link
The LT1030CD meets or exceeds the EIA/TIA-232-F specification while consuming only 500 µA of supply current, which makes it ideal for micropower serial links in remote sensor nodes and instrumentation. The driver-only architecture lets the designer place the receiver on the far side of a digital isolator (such as the ISO7221) for galvanic isolation, which is critical in medical and industrial systems where ground loops are a concern. The ±5V to ±15V supply range supports both low-voltage battery systems and standard ±12V industrial supplies. Designers should add 0.1 µF bypass capacitors near each supply pin to suppress switching transients in long-cable applications.
推荐
Industrial Control Serial Interface
In industrial control systems, the LT1030CD provides a robust RS-232 driver that can withstand ±30V externally applied voltages, which is important when long cables pick up ESD or transient surges. The 14-SOIC (D) package is footprint-compatible with many standard RS-232 transceivers, allowing PCB reuse across product variants. The 0°C to 70°C commercial temperature range is sufficient for indoor cabinet installations, but the wider 10 mA drive current ensures the signal can reach receivers 50+ meters away without booster circuitry. The SHDN pin supports power-down sequencing required by deterministic industrial control loops.
推荐
Test and Measurement Equipment UART Link
Bench-top test and measurement instruments often use the LT1030CD to provide a service-port RS-232 interface that is isolated from the main analog front-end. The driver-only architecture lets the test engineer connect the link to a USB-to-serial adapter on the host PC side while keeping the instrument ground reference clean. The 500 µA supply current is negligible compared to the instrument's main power budget, and the shutdown feature allows the UART to be powered down during precision measurements to avoid any digital noise coupling into the analog path. The standard 14-SOIC (D) footprint simplifies PCB layout and keeps the BOM cost low for low-volume test equipment.
推荐
推荐产品汇总
工程参考数据： LT1030CD ——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 | LT1030CDG4 | LT1030CDR | MAX202CD | MAX232D |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 14-SOIC (D) | 14-SOIC (D) - same | 14-SOIC (D) - same | 14-SOIC (D) - same | 14-SOIC (D) - same |
| Function | Quad RS-232 Line Driver (4/0) | Quad RS-232 Line Driver (4/0) | Quad RS-232 Line Driver (4/0) | RS-232 Transceiver (2/2) | RS-232 Transceiver (2/2) |
| Supply Voltage | ±5V to ±15V | ±5V to ±15V | ±5V to ±15V | 4.5V to 5.5V single supply | 4.5V to 5.5V single supply |
| Supply Current | 500 µA typical | 500 µA typical | 500 µA typical | 8 mA typical | 8 mA typical |
| Shutdown Current | 0 µA | 0 µA | 0 µA | 1 µA | 1 µA |
| Output Tolerance | ±30 V | ±30 V | ±30 V | ±25 V | ±25 V |
| Output Drive Current | 10 mA | 10 mA | 10 mA | 20 mA | 20 mA |
| Operating Temperature | 0°C to 70°C | 0°C to 70°C | 0°C to 70°C | 0°C to 70°C | 0°C to 70°C |
关键差异点
- Driver-only architecture with shutdown （对比 MAX202CD)
- Lower supply current consumption （对比 MAX232D)
- Higher output voltage tolerance （对比 MAX232D)
设计说明
Place 0.1 µF ceramic bypass capacitors as close as possible to the V+ (pin 2) and V- (pin 9) supply pins, with a larger 1 µF to 10 µF bulk capacitor on each rail. The ±15V supply range means a regulated bipolar supply is needed; if only a single 5V rail is available, use a charge-pump inverter or upgrade to a single-supply transceiver like the MAX232D. The shutdown (SHDN) pin on pin 4 reduces supply current to zero when asserted high; pull it to ground through a 100 kΩ resistor when unused to prevent floating-input oscillation.
The LT1030CD is a driver-only device - it has 0 receivers. Connecting it directly to a serial port without a companion receiver (such as the SN75C189 or SN75189) will yield a non-functional link. Also note that the V+ and V- pins require external capacitors in some applications; consult the datasheet application circuit for the exact values. The 0°C to 70°C commercial temperature range is narrower than industrial-grade alternatives, so verify ambient temperature in the final enclosure before selection.
The 14-SOIC (D) package has a standard 1.27 mm pin pitch and is footprint-compatible with most 14-pin SOIC RS-232 transceivers including the MAX202CD, MAX232D, and ADM202. Route the four driver outputs (pins 8, 11, 13, 14) as short and direct as possible to minimize capacitive loading, and place the bypass capacitors on the same side of the board as the IC. For parallel-bus applications where multiple LT1030CD outputs are tied together, ensure that only one device's SHDN pin is asserted low at any time to avoid contention.
合规信息
RoHS compliant per TI product page. Lead-free NiPdAu finish. Not AEC-Q100 qualified - this is a commercial-grade part. The LT1030CDG4 suffix indicates the green/RoHS-compliant assembly process.
