LM393PSRG4 - Dual Open-Collector Comparator | TI
MPN： LM393PSRG4 ✓ 啟用中LM393PSRG4 概覽
A comparator is an interface IC that compares two input voltages and changes its output state when the non-inverting input rises above the inverting input. The LM393 family places two independent comparator channels in one package. Its differential architecture is useful in sensing circuits, where a small signal around a reference voltage determines whether a downstream logic device receives a high or low state. Open-collector outputs also allow the output stage to be pulled up to the voltage required by the receiving logic.
The principal benefits of the LM393PSRG4 are its wide supply-voltage range, low supply-current drain of 0.4 mA typical per comparator, and output compatibility with multiple logic families. The common-mode input range includes ground, which simplifies single-supply sensing when signals remain near the lower rail. Two channels can be used independently or together to create window, zero-crossing, or saturation-detection functions.
The device is specified for general-purpose signal comparison rather than high-speed line sensing. A listed characterization identifies a 1.3 µs response-time class for this device family, while the B-version devices provide improved specifications for applications where tighter electrical performance is useful. Because each output is open collector, an external pull-up resistor is required unless the output is used in a wired-AND configuration. Output-current and pull-up limits must be checked against the manufacturer datasheet for the chosen operating condition.
Typical uses include industrial sensor thresholds, battery monitoring, window comparators, relay or LED drive, oscillator and timer circuits, and conversion of an analog measurement into a digital logic event. The two channels make the device especially useful when a board needs two independent comparison points without using separate single-comparator packages.
PCB implementation should preserve short comparator-input paths and provide a stable return for both channels. Keep sensitive reference and signal traces away from switching nodes and output pull-up networks. Select the external pull-up value to balance rise time, power dissipation, and the sink-current rating of the open-collector stage. Validate input and output behavior across temperature and supply tolerances before using the comparator close to its supply or common-mode limits.
This page combines the verified device identity, package information, family-level operating characteristics, cross-reference candidates, application guidance, and design considerations into one engineering-focused resource. Use the manufacturer datasheet and pin-description table for final footprint, input limits, output-current limits, and ordering details.
直接替換替代品，適用於 LM393PSRG4 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： LM393PSRG4 （相同外形與佔位） — 差異在於 Package, Number of Channels, Output Type, Operating Temperature Range, Output Compatibility.
LM393APSR
✅ 直接替換📋 參考替代品（不在目錄中）
LM393DT
✅ 直接替換✗ 缺貨
$0.0461 / 單位
查看資料表 →LM393B
✅ 直接替換📋 參考替代品（不在目錄中）
LM2903PSR
✅ 直接替換📋 參考替代品（不在目錄中）
LM393PSRG4 最大額定值與電氣特性
| Comparator Type | Dual differential comparator |
| Number of Channels | 2 channels |
| 輸出類型 | Open-collector |
| Single-Supply Voltage Range | 2 V to 36 V |
| Dual-Supply Voltage Range | ±1 V to ±18 V |
| Maximum Tested Supply Rating | 30 V |
| Supply Current Per Comparator | 0.4 mA typical |
| Input Common-Mode Range | Includes ground |
| Response Time | 1.3 µs |
| Output Compatibility | TTL, MOS, and CMOS |
| 封裝 | 8-pin SOIC |
| 安裝類型 | Surface mount |
LM393PSRG4 8-pin soic 腳位配置指南
LM393PSRG4（8-pin soic 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： LM393PSRG4.
請參閱 資料表 以查看完整腳位配置。
典型應用
LM393PSRG4 適用於 6 應用s: Industrial Sensor Threshold Detection, Battery Voltage Monitoring, Analog-to-Digital Threshold Conversion, LED and Relay Drive, Window and Limit Detection, Oscillator and Timer Support.
Industrial Sensor Threshold Detection
The LM393PSRG4 fits industrial sensor threshold detection because its common-mode input range includes ground, allowing a sensor signal near the lower supply rail to be compared directly against a reference. The 1.3 µs response-time class supports general-purpose switching decisions without requiring a high-speed comparator. Place the two input paths close to the device, reference the threshold with a stable divider, and use a pull-up resistor on the open-collector output. Confirm that the sensor voltage, offset, and noise remain within the comparator limits.
推薦
Battery Voltage Monitoring
The LM393PSRG4 can supervise a battery-derived voltage using its wide 2 V to 36 V single-supply capability and low 0.4 mA typical supply-current drain per comparator. One channel may detect an undervoltage event while the other detects an overvoltage event, allowing two independent threshold decisions from one package. The open-collector outputs can directly pull down system-enable or alert lines when external pull-up resistors are installed. Validate the battery range and both threshold extremes before finalizing resistor values.
推薦
Analog-to-Digital Threshold Conversion
The LM393PSRG4 converts an analog measurement into a digital event by comparing the input against a reference and driving an open-collector logic output. Its outputs are compatible with TTL, MOS, and CMOS, which supports interfacing to processors and programmable controllers through an appropriate pull-up network. The common-mode range including ground makes it useful for sensor-conditioned signals near zero volts. Account for input offset voltage and reference accuracy when defining the transition point, especially in fine-resolution measurement systems.
推薦
LED and Relay Drive
The LM393PSRG4 can act as the decision element in LED-warning or relay-control circuits because its open-collector output can sink current from a pull-up-driven indicator or driver stage. The output architecture permits wired-AND use when multiple comparator channels share a pull-up bus. Relay coils and LEDs require their own drive-current and flyback considerations, so the comparator should normally control a transistor rather than carry the full load directly. Check the output sink-current and power limits against the worst-case load.
推薦
Window and Limit Detection
Both LM393PSRG4 channels can form a window detector, with one channel comparing the measured voltage against a lower reference and the other against an upper reference. The resulting open-collector logic states identify out-of-range and in-range conditions. The device's 2 V to 36 V single-supply range supports many industrial and automotive-style sensing rails when suitably rated. Reference accuracy, input offset, and resistor tolerances determine the practical window width, so simulate the limits across tolerance before relying on a narrow safety band.
推薦
Oscillator and Timer Support
The LM393PSRG4 can provide threshold detection and retrigger control in relaxation oscillators and timer-style circuits. Its 1.3 µs response-time class and low 0.4 mA typical current per comparator are appropriate for many low-frequency general-purpose timing applications. The open-collector stage can support an RC timing network and a pull-up, although propagation delay contributes to timing accuracy. Use measured output rise and fall behavior when precision timing is required, and avoid operating near absolute-maximum input or supply limits.
推薦
推薦產品摘要
工程參考資料，適用於 LM393PSRG4 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | LM393APSR | LM393 | LM393B | LM2903PSR | LM2903M |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | onsemi |
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOP |
| Comparator Channels | 2 | 2 | 2 | 2 | 2 | 2 |
| Output Type | Open-collector | Open-collector | Open-collector | Open-collector | Open-collector | Open-collector |
主要差異化特點
- Provides two independent comparisons in one package (對比LM2903M)
- Supports a wide single-supply operating range (對比LM2903M)
- Provides low supply-current drain (對比LM393B)
設計說明
Do not omit the open-collector pull-up resistor or connect an output above the comparator's permitted input and supply limits. The pull-up establishes the high state, while the device sinks current in the low state. Select the pull-up rail to match the receiving TTL, MOS, or CMOS logic and calculate both the resistor's dissipation and the comparator's peak sink current. Incorrect pull-up values can cause slow edges, excessive current, or an unrecognized high level.
Route the non-inverting and inverting inputs as short, quiet nets, especially when the comparator evaluates a low-level sensor signal. Keep the reference divider and input traces away from relay-coil wiring, switching-regulator nodes, and other high-current paths. Maintain a low-impedance ground return for both channels. Open-collector pull-up routes should also avoid coupling directly into sensitive input traces because fast external edges can introduce coupling.
The verified family value of 0.4 mA typical per comparator implies approximately 0.8 mA typical for both channels under the stated condition. Use the manufacturer characteristic curves for maximum-current design because input state, voltage, grade, and temperature affect the result. Place local supply-decoupling capacitance close to the device and keep the comparator supply within the 2 V to 36 V single-supply range for this ordering variant.
A 1.3 µs response-time class does not define a complete digital edge in every circuit because the open-collector rise time is set mainly by the external pull-up resistor and total capacitance. For signals interpreted as clock or high-speed data, measure propagation delay, rise time, overshoot, and ringing in the final layout. Increase the pull-up resistance for a slower edge, or use a stronger suitable driver when a faster edge is required.
合規資訊
The manufacturer and distributor results identify the LM393 family and ordering variants but do not explicitly state the requested environmental and material-compliance classifications.
