LM239D - Quad Open-Collector Comparator, 14-SOIC | Texas Instruments
料号： LM239D ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.2948 | $0.29 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
LM239D 概述
What is a voltage comparator? A comparator is an analog interface IC that compares two input voltages and changes its output state according to their relationship. The LM239 belongs to the comparator hierarchy: voltage comparator → differential comparator → quad analog comparator → semiconductor. Each channel is independent, allowing one package to perform four separate sensing or threshold decisions. An open-collector output can sink current while remaining electrically disconnected from the positive supply, requiring an external pull-up when a logic-high output is needed.
Key verified features include single or split-supply operation, low input bias current of 25 nA typical, and low input offset current of ±5.0 nA typical. The device supports TTL, MOS, CMOS, DTL, and ECL-compatible outputs. The manufacturer’s related LM239 family page identifies the B-version family as a drop-in replacement for LM239, LM339, and LM2901 families, while also noting improved offset voltage, supply current, propagation delay, and ESD performance for the B versions.
The LM239D is appropriate for industrial threshold detection, battery monitoring, sensor signal conditioning, window comparators, control loops, and embedded logic interfaces. In a single-supply circuit, the common-mode input range includes ground, which is useful for low-voltage sensing. In split-supply operation, the differential input range can extend up to the maximum-rated supply span, but the complete electrical limits must be taken from the manufacturer datasheet before final design sign-off.
The principal design consideration is output polarity and pull-up implementation. Because the outputs are open collector, four external or shared pull-up networks may be required, and their resistor values determine rise time, power dissipation, and compatibility with downstream logic. Input protection, supply bypassing, and unused-channel handling should also follow the datasheet guidance. This page combines verified product specifications, sourcing information, application guidance, and explicitly qualified replacement analysis for LM239D engineers.
直接替换替代料： LM239D ——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： LM239D （相同外形与封装尺寸） ——差异在于 Response Time, Package, Common-Mode Input Range, Input Bias Current, Input Offset Voltage.
快速对比工具——选择替代料号进行并排对比：
LM339B
✅ 直接替换📋 参考替代料（不在目录中）
LM2901B
✅ 直接替换📋 参考替代料（不在目录中）
LM339D
✅ 直接替换✓ 有现货
联系询价
查看数据手册 →LM2901D
✅ 直接替换📋 参考替代料（不在目录中）
LM239D 最大额定值与电气特性
| Comparator Type | Quad precision differential voltage comparator |
| Number of Channels | 4 independent channels |
| 电源电压 | ±15 V or 30 V |
| 输出类型 | Open-collector |
| Input Bias Current | 25 nA typical |
| Input Offset Current | ±5.0 nA typical |
| Input Offset Voltage | 2 mV maximum for LM239A family variants; LM239D-specific value not supplied |
| Response Time | 1.3 µs typical |
| Common-Mode Input Range | Includes ground |
| Differential Input Range | Equal to maximum-rated supply voltage |
| Output Compatibility | TTL, MOS, CMOS, DTL, and ECL compatible |
| 封装 | 14-pin SOIC |
| 安装类型 | Surface mount |
| Automotive Application | Intended for consumer, automotive, and industrial electronic applications |
| ESD Rating | 2 kV HBM for related LM339B and LM2901B family versions; LM239D-specific rating not supplied |
LM239D 引脚配置
| 引脚 1 | [DATA_NEEDED: pin name] — Exact LM239D pin name is not supplied in the verified data |
| 引脚 2 | [DATA_NEEDED: pin name] — Exact LM239D pin name is not supplied in the verified data |
| 引脚 3 | [DATA_NEEDED: pin name] — Exact LM239D pin name is not supplied in the verified data |
| 引脚 4 | [DATA_NEEDED: pin name] — Exact LM239D pin name is not supplied in the verified data |
| 引脚 5 | [DATA_NEEDED: pin name] — Exact LM239D pin name is not supplied in the verified data |
| 引脚 6 | [DATA_NEEDED: pin name] — Exact LM239D pin name is not supplied in the verified data |
| 引脚 7 | [DATA_NEEDED: pin name] — Exact LM239D pin name is not supplied in the verified data |
| 引脚 8 | [DATA_NEEDED: pin name] — Exact LM239D pin name is not supplied in the verified data |
| 引脚 9 | [DATA_NEEDED: pin name] — Exact LM239D pin name is not supplied in the verified data |
| 引脚 10 | [DATA_NEEDED: pin name] — Exact LM239D pin name is not supplied in the verified data |
| 引脚 11 | [DATA_NEEDED: pin name] — Exact LM239D pin name is not supplied in the verified data |
| 引脚 12 | [DATA_NEEDED: pin name] — Exact LM239D pin name is not supplied in the verified data |
| 引脚 13 | [DATA_NEEDED: pin name] — Exact LM239D pin name is not supplied in the verified data |
| 引脚 14 | [DATA_NEEDED: pin name] — Exact LM239D pin name is not supplied in the verified data |
典型应用
LM239D 适用于 6 应用s: Industrial Threshold Detection, Battery Voltage Monitoring, Sensor Signal Conditioning, Window and Over/Under Voltage Comparators, Consumer Equipment Control, Automotive and Industrial Low-Level Sensing.
Industrial Threshold Detection
The LM239D fits industrial threshold-detection circuits because it provides four independent comparator channels, 25 nA typical input bias current, and a common-mode input range that includes ground. Use one channel to monitor a sensor or divided supply rail against a reference and use the open-collector output to drive a relay, PLC input, or logic gate through a pull-up. The 1.3 µs typical response is suitable for ordinary sensing thresholds, while the open-collector interface avoids actively driving the field-side signal. Verify industrial temperature, noise, and supply requirements against the exact ordering code.
推荐
Battery Voltage Monitoring
The LM239D can compare divided battery voltages with a reference in single-supply systems, using the ground-referenced common-mode capability for low-voltage sensing. Its four channels allow several battery or rail thresholds to be supervised without requiring four separate packages. The open-collector outputs are useful for wired-alarm or enable signaling because each output can sink current and share a suitably chosen pull-up arrangement. Designers should calculate divider values, account for input bias current of 25 nA typical, and confirm the device’s exact supply and common-mode limits.
推荐
Sensor Signal Conditioning
The LM239D is suitable for conditioning high-impedance sensor signals where the comparator must make a clean threshold decision without loading the source heavily. The verified 25 nA typical input bias current helps preserve sensor accuracy, while the four-channel arrangement supports multiple trip points or redundant sensing channels. Place the sensing divider close to the input, reference the comparator against a stable reference, and use a pull-up that matches the downstream logic voltage. The 1.3 µs typical response is generally appropriate for slow sensor changes rather than high-bandwidth signal processing.
推荐
Window and Over/Under Voltage Comparators
Two LM239D channels can implement an over-voltage and under-voltage window around a reference, while the other channels can monitor additional rails or provide diagnostic signals. The open-collector outputs are convenient for wired-OR style alarm collection or for driving a digital input with a pull-up. Because the device supports single and split-supply operation, the same architecture can monitor positive rails or a split system, subject to the exact input limits. Keep the divider impedance high enough to limit current but low enough to control errors from input bias current and leakage.
推荐
Consumer Equipment Control
The LM239D can support consumer-equipment functions such as level detection, low-level sensing, memory-related thresholds, and simple automatic control decisions. Four independent channels reduce component count when several controls are needed, and the open-collector outputs allow the system to use a common pull-up rail or separate pull-ups for different logic domains. The verified product description explicitly identifies consumer electronics as an intended application. Confirm that the exact suffix meets the product’s temperature, supply, and quality requirements before production use.
推荐
Automotive and Industrial Low-Level Sensing
The LM239D-related product information identifies consumer, automotive, and industrial electronic applications, including level detection and low-level sensing. The quad channel count can support multiple thresholds in a compact circuit, while the low typical input bias current is useful when sensing source resistance is significant. Automotive deployment must not be based solely on the application wording: confirm the exact LM239D ordering code, temperature grade, qualification status, transient tolerance, and supply behavior in the manufacturer documentation before using it in a safety- or reliability-critical circuit.
推荐
推荐产品汇总
工程参考数据： LM239D ——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 | LM339B | LM2901B | LM339D | LM2901D | LM393D |
|---|---|---|---|---|---|---|
| Comparator Channels | 4 independent channels | Quad comparator family; exact channel specification not supplied | Quad comparator family; exact channel specification not supplied | Quad comparator family | Quad comparator family | Dual comparator family |
| Package | 14-pin SOIC | SOIC-14 replacement candidate; exact package confirmation required | SOIC-14 replacement candidate; exact package confirmation required | SOIC-14 | SOIC-14 | SOIC-14 |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Output Type | Open-collector | Open-collector family; exact variant not supplied | Open-collector family; exact variant not supplied | Open-collector family; exact variant not supplied | Open-collector family; exact variant not supplied | Open-collector family; exact variant not supplied |
关键差异点
- Four independent comparator channels in one 14-SOIC package （对比 LM393D)
- Open-collector interface with broad logic compatibility （对比 LM339D)
- Low input bias current for high-impedance sensing （对比 LM2901D)
设计说明
Open-collector outputs require a pull-up resistor whenever the comparator must produce a valid logic-high level. Select the pull-up rail to match the receiving device, calculate the low-state sink current with the pull-up resistance and output-low voltage, and check the resulting output rise time against the downstream system timing. Do not assume the comparator actively drives a high level.
The verified data identifies single or split-supply operation and a common-mode range including ground, but the exact LM239D input limits depend on the ordering code and supply condition. Before connecting a sensor or divider, verify that both inputs remain within the allowed common-mode range, the differential input stays within its rating, and unused channels are configured according to the manufacturer datasheet.
Place the comparator input traces away from switching nodes and high-current paths, and keep the reference and feedback network close to the relevant inputs. Because the typical input bias current is 25 nA, excessively high source impedance can create meaningful offset error; use resistor values that balance low current consumption against input-loading and leakage errors. Bypass the supply pins close to the package using the manufacturer’s recommended network.
The verified response time is 1.3 µs typical, but real switching delay also depends on input overdrive, supply voltage, output pull-up resistance, and load capacitance. If the circuit controls a relay, reset signal, or safety-related threshold, include output transition time and downstream propagation in the timing budget rather than relying only on the typical comparator response specification.
合规信息
The supplied verified data does not provide LM239D-specific RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals statements. Automotive suitability is mentioned as an application context, but qualification must not be inferred.