LM393DR2 - Dual Open-Collector Comparator, 8-SOIC | onsemi
MPN: LM393DR2 ✓ Hoạt độngLM393DR2 Tóm tắt
A comparator is a differential amplifier whose output is driven to one of two logic states depending on the sign of the differential voltage applied to its two inputs. In the power hierarchy, a comparator sits between a linear amplifier and a logic gate: like an amplifier it senses small voltage differences, but like a logic element it produces a hard, saturated output rather than a proportional one. Two comparators packaged in one 8-pin SOIC give the designer a window detector, an over/under-voltage supervisor, or a pair of independent threshold stages in a single footprint.
Key features of the LM393DR2 include its low offset voltage, which minimizes the input differential that must be exceeded before the output flips state, and its open-collector output stage. The open collector means the output is a pulled-down transistor rather than a push-pull driver, so an external pull-up resistor to the supply rail is required. This arrangement allows the designer to set the logic-high reference to any voltage in the system, and it lets several comparators share one bus when only one is active at a time.
Internally, the device contains two fully independent comparator channels with their own input and output pins, so the two halves can be used for unrelated functions, powered from split rails, or used in complementary configurations. Because the outputs are open collector, the device can also be used as a simple line driver, relay driver, or lamp driver by sinking the load current through the output transistor with a suitable pull-up network.
Typical applications include DC over-voltage and under-voltage protection, battery low-state detection, window comparators for temperature or light sensing, zero-cross detection in motor and mains circuits, and general threshold logic in industrial control boards.
One key design point: because the output is open collector, always fit a pull-up resistor. Choose its value so that the resistor dissipates acceptable power while keeping output rise time acceptable, and confirm that the input common-mode range covers the full signal swing of your source node.
This page consolidates the manufacturer description, package details, cross-reference data and drop-in alternatives, plus practical design notes, comparison parameters and application guidance that are not gathered in one place on a single datasheet page.
Bộ thay thế dễ dàng lắp đặt cho LM393DR2 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với LM393DR2 (cùng hình factor và footprint) — khác nhau ở Package, Response Time, Output Type, Common-Mode Input Range, RoHS Status.
LM393DR2G
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LM393D
✅ Drop-In✗ Hết hàng
$0.11 / Đơn vị
Xem tài liệu →LM393ADR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LM393DR
✅ Drop-In✗ Hết hàng
$0.11 / Đơn vị
Xem tài liệu →LM393LVDR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LMV393
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LM393DR2 Tỷ lệ tối đa & tính chất điện
| Number of Comparators | 2 (dual, independent channels) |
| Comparator Type | Low offset voltage precision voltage comparator |
| Kiểu đầu ra | Open-collector |
| Input Common-Mode Range | Extends to the negative rail (ground) with single supply operation |
| Supply Operation | Single supply or split supply |
| Response Time | 1300 ns |
| Hộp | 8-pin SOIC (SOIC-8, D package) |
| Số chân | 8 pins |
| Kiểu lắp đặt | Surface mount |
| Shipping Format | Tape and reel (TR) |
Cấu hình chân LM393DR2
| Chân 1 | OUT1 — Comparator 1 output (open collector) |
| Chân 2 | IN1- — Comparator 1 inverting input |
| Chân 3 | IN1+ — Comparator 1 non-inverting input |
| Chân 4 | V- — Negative supply / ground reference |
| Chân 5 | IN2+ — Comparator 2 non-inverting input |
| Chân 6 | IN2- — Comparator 2 inverting input |
| Chân 7 | OUT2 — Comparator 2 output (open collector) |
| Chân 8 | V+ — Positive supply |
Ứng dụng tiêu biểu
LM393DR2 phù hợp cho 6 Áp dụngs: DC Over-Voltage and Under-Voltage Protection, Battery Low-State and Charger Detection, Window Comparators for Temperature and Light Sensing, Relay, Solenoid and Lamp Driver Stage, Motor Control and Zero-Cross Detection, Industrial Threshold Logic and Sensor Interfaces.
DC Over-Voltage and Under-Voltage Protection
The LM393DR2 suits supply supervision because its common-mode input range extends to the negative rail under single-supply operation, so a divider-referenced rail voltage can be compared to a threshold without mid-supply biasing. The open-collector output can directly assert a shutdown or fault line, and the 1300 ns response time is far faster than any relay or mechanical protection scheme. In a 12 V industrial board, for example, a resistor divider at the 16 V trip point feeds one channel while the second channel monitors a 9 V under-voltage condition. Two thresholds, one 8-pin SOIC footprint, no level shifting and no external bias network. Because the output is open collector, tie the pull-up to the rail used by the supervisor IC so the fault signal matches that domain.
Được đề xuất
Battery Low-State and Charger Detection
For portable equipment powered from a single cell or two-cell pack, the LM393DR2 provides a simple, low-component-count low-battery detector. The comparator input referenced to ground sees the pack voltage directly, which matches the LM393's rail-to-ground common-mode capability, so no mid-supply bias resistors are needed. The open-collector output can pull a status LED to ground through a series resistor or drive the enable pin of a DC-DC converter. Its slow 1300 ns propagation is an advantage here, because it prevents chattering around the trip point. Using the second channel of the same SOIC for the charger-present signal keeps the board area small, which matters in wearables and handheld instruments where every square millimetre is constrained.
Được đề xuất
Window Comparators for Temperature and Light Sensing
A window comparator needs two thresholds rather than one, and the LM393DR2 provides two independent channels in a single 8-pin SOIC package, making it a natural fit for thermistor or photodiode monitoring. The upper threshold is applied to one inverting input and the lower threshold to the other inverting input, while the sensor node drives both non-inverting inputs; the output state then indicates whether the measurement sits inside or outside the acceptable band. Because both channels are independent, the threshold divider networks stay simple. The open-collector outputs can be tied to a common pull-up to produce a single combined fault output, or driven separately for separate LED indicators. The 1300 ns response time is irrelevant for thermal or ambient-light loops, which update over seconds.
Được đề xuất
Relay, Solenoid and Lamp Driver Stage
Because the LM393DR2 output is an open-collector transistor rather than a push-pull driver, it can sink the current of a relay coil, solenoid or indicator lamp while the pull-up resistor sets the logic-high reference to the system rail. This makes the device a good match for driving discrete loads from a low-voltage control MCU without adding a driver IC. The second channel of the same package can drive a second load or serve as a complementary output, giving two load channels from one 8-pin SOIC. The 1300 ns response time is adequate for relay and solenoid mechanisms, whose mechanical time constants are orders of magnitude slower. Fit a flyback diode across any inductive load and keep the pull-up value high enough that the comparator's sink rating is not exceeded.
Được đề xuất
Motor Control and Zero-Cross Detection
In motor and mains-zero-cross detection circuits, the LM393DR2 compares the AC-derived signal against a threshold and produces a clean logic transition used for timing. The rail-to-ground common-mode capability lets the comparator work directly with a low-voltage rectified signal referenced to the negative rail, which simplifies the sensing network in low-cost motor controllers. Its open-collector output can drive the timer capture input of a microcontroller directly, with the pull-up resistor setting the trip level, and the wide input tolerance suits noisy industrial environments. The comparatively slow 1300 ns response is not a limitation here because zero-cross events occur at line or commutation frequency. Note that the sensing network must be designed for the mains-referenced environment and appropriately reinforced.
Được đề xuất
Industrial Threshold Logic and Sensor Interfaces
In industrial instrumentation, the LM393DR2 is frequently used as the discrete decision stage between a sensor front end and the digital section of the controller. One channel can act as a limit detector on a 4-20 mA loop-derived voltage while the second channel provides a continuity or plausibility check on the same signal, both within one 8-pin SOIC footprint. The open-collector output interfaces cleanly with modern CMOS logic because the pull-up can be referenced to the logic rail, and the slow response time filters out short glitches without additional filtering. For a DIN-rail controller operating from a 24 V rail, the wide supply tolerance of the LM393 family is valuable. Where a stricter automotive qualification is required, the LM2904 family provides the graded alternative in the same form factor.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho LM393DR2 — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | LM393DR2G | LM393D | LM393ADR | LM393DR | LM393LVDR |
|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| Brand | onsemi | onsemi | onsemi | onsemi | Texas Instruments | Texas Instruments |
| Number of Comparators | 2 (dual, independent) | 2 (dual, independent) | 2 (dual, independent) | 2 (dual, independent) | 2 (dual, independent) | 2 (dual, independent) |
| Output Type | Open-Collector | Open-Collector | Open-Collector | Open-Collector | Open-Collector | Open-Collector |
| Supply Operation | Single or split supply | Single or split supply | Single or split supply | Single or split supply | Single or split supply | Single supply, lower voltage range |
| Input Common-Mode Range | Extends to the negative rail (ground) with single supply | Extends to the negative rail (ground) with single supply | Extends to the negative rail (ground) with single supply | Extends to the negative rail (ground) with single supply | Rail-to-rail input | Rail-to-rail input |
| Input Type | Bipolar differential inputs | Bipolar differential inputs | Bipolar differential inputs | Bipolar differential inputs | Bipolar differential inputs | CMOS inputs |
Bảo phân biệt quan trọng
- Two fully independent channels with rail-to-ground common-mode input in one 8-pin SOIC (vsLM393LVDR)
- Open-collector outputs usable as a wired-AND bus with a shared pull-up (vsLMV393)
- Broad second-source base in the same 8-SOIC footprint (vsLM393DR)
- Single-package dual threshold monitoring avoids a second IC (vsLM2904P3)
Ghi chú thiết kế
Because the LM393DR2 output is open collector, the pull-up resistor is a mandatory part of the circuit, not an optional accessory. Place the pull-up resistor close to the output pin (within a few millimetres) so that the high state is not degraded by board capacitance or crosstalk from adjacent switching nodes. If two open-collector outputs are wired together as a wired-AND bus, use a single shared pull-up sized for the summed sink current. Keep the pull-up reference rail within the input common-mode range of whatever device reads the resulting logic level.
The most common design error with the LM393DR2 is designing the input network outside the common-mode range. With single supply operation the valid input range extends down to the negative rail (ground) but not above the positive rail, so a signal that swings near VCC must be attenuated or shifted. The second common error is treating the 1300 ns response time as negligible in a fast comparator loop. Estimate the pull-up rise time with the RC of the pull-up resistor and the total bus capacitance, and confirm that the output transistor's sink rating covers the worst-case pull-up current plus any external load.
Estimated: with a single 5 V supply, a 10 kOhm pull-up and 50 pF of total bus capacitance, the output rise time constant is about 0.5 microseconds and the pull-up dissipation at the logic-low state is (5 V)^2 / 10 kOhm = 2.5 mW, which is negligible for the SOIC package. Increase the pull-up resistance only after confirming that the slower edge does not cause false triggering in downstream CMOS logic, and always add a pull-down at the open-collector output node if the output can be left floating during power-down.
Place the two comparator channels so that the sensitive non-inverting inputs run away from the switching nodes of the surrounding power stage, and keep the input traces short and guarded by a ground trace where possible. The negative supply pin is the reference for both channels, so give it a low-impedance connection close to the device rather than routing it back to a distant ground star point. In relay or mains-derived sensing circuits, keep the high-voltage network physically separate from the logic side of the board and observe the creepage and clearance required by the working voltage.
Thông tin tuân thủ
The LM393 series documentation compares RoHS and REACH status between the LM393DR2 and its LM393ADR / LM393D orderings, but no declaration value is stated for the exact LM393DR2 suffix, so all compliance fields are recorded as unknown. Use the G-suffixed ordering code (LM393DR2G) if a documented lead-free/RoHS-compliant catalog designation is required for your supply chain.
