LM393TL - Dual Open-Collector Comparator, 2-36V | Texas Instruments
MPN: LM393TL ✓ সক্রিয়LM393TL সারাংশ
A comparator is a differential amplifier that converts the voltage difference between two inputs into a logic-level output. As part of the wider signal-conditioning chain, a comparator sits between sensor front-ends and digital logic, in the hierarchy analog IC -> comparator -> differential input stage -> signal conditioning. The LM393 family is the classic open-collector (open-drain) dual comparator used for threshold detection, zero-crossing sensing and open-drain bus interfacing.
Key features of the LM393TL include a very wide 2 V to 36 V single supply range (or ±1 V to ±18 V split supply), an input common-mode range that includes ground, a differential input voltage range of ±38 V, and outputs compatible with TTL, CMOS and MOS logic families. Because the outputs are open collector, a single external pull-up resistor per channel is required to establish a logic high, which also allows wired-AND busing and level shifting.
Internally the LM393 is built around a classic bipolar differential input stage driving a large-area open-collector output transistor. The wide input common-mode range and low supply current make the part suitable for slow, cost-sensitive sensing rather than high-speed signal conditioning; the 1300 ns response time reflects the open-collector architecture rather than any limitation of the input stage.
Typical applications include battery-powered threshold detection, over/under-voltage and temperature monitoring in industrial and consumer equipment, zero-cross detection in AC mains and motor control, and open-drain level shifting between 5 V TTL systems and 3.3 V CMOS logic.
Design consideration: because the LM393TL output is open collector, always fit a pull-up resistor (typically 2 kΩ to 10 kΩ) close to the device, and check that the pull-up rail voltage does not exceed the absolute maximum ratings of the output transistor. Note also that the commercial-grade LM393 is rated 0 °C to 70 °C; use LM2903 for industrial temperature ranges.
This page combines verified distributor and manufacturer data with package-specific alternatives, a parameter comparison table, and practical layout notes that are not found in the original manufacturer datasheet, giving engineers a faster path from part selection to a working PCB.
এর জন্য ড্রপ-ইন বিকল্প LM393TL — একই package, pin-to-pin compatible। ভিন্ন package-এর যেসব পার্টে PCB rework প্রয়োজন সেগুলো বাদ দেওয়া হয়েছে।
এই সিরিজের ভ্যারিয়েন্ট
একই সিরিজের মডেল যেগুলো drop-in compatible LM393TL (একই form factor এবং footprint) — পার্থক্য রয়েছে Comparator Type, Input Common-Mode Range, Operating Temperature Range, Output Type, Package.
LM393B
✅ ড্রপ-ইন📋 রেফারেন্স বিকল্প (ক্যাটালগে নেই)
LM393LV
✅ ড্রপ-ইন📋 রেফারেন্স বিকল্প (ক্যাটালগে নেই)
LM2903BIDR
✅ ড্রপ-ইনমূল্যের জন্য যোগাযোগ করুন
ডেটাশিট দেখুন →LM2903BIDR
✅ ড্রপ-ইনমূল্যের জন্য যোগাযোগ করুন
ডেটাশিট দেখুন →LM393TL সর্বোচ্চ রেটিং ও বৈদ্যুতিক বৈশিষ্ট্য
| Comparator Type | Dual differential voltage comparator |
| Number of Elements | 2 |
| Supply Voltage Range | 2 V to 36 V (±1 V to ±18 V) |
| আউটপুট টাইপ | Open-Collector (Open-Drain) |
| Output Logic Compatibility | TTL, CMOS, MOS |
| Input Offset Voltage (max) | 9 mV (9000 uV) |
| Response Time | 1300 ns |
| Input Common-Mode Range | Includes ground |
| Differential Input Voltage | ±38 V |
| প্যাকেজ | 8-WFBGA / 8-DSBGA |
| পিনের সংখ্যা | 8 |
| মাউন্টিং টাইপ | Surface Mount |
| অপারেটিং তাপমাত্রার পরিসর | 0 °C to 70 °C (commercial grade) |
| Shipping Method | Tape and Reel (T/R) |
| Product Type | Comparator, Standard (General Purpose) |
| Low Offset Voltage Family | LM193 / LM293 / LM393 / LM2903 series |
| B-Version Drop-In Status | LM393B is a drop-in replacement for LM393 |
| RoHS Compliance | unknown |
LM393TL পিন কনফিগারেশন
| পিন 1 | OUT1 — Comparator 1 open-collector output |
| পিন 2 | IN1- — Comparator 1 inverting input |
| পিন 3 | IN1+ — Comparator 1 non-inverting input |
| পিন 4 | GND — Ground (also the centre pad connection on the WFBGA variant) |
| পিন 5 | IN2+ — Comparator 2 non-inverting input |
| পিন 6 | IN2- — Comparator 2 inverting input |
| পিন 7 | OUT2 — Comparator 2 open-collector output |
| পিন 8 | VCC — Positive supply voltage (2 V to 36 V) |
সাধারণ ব্যবহার
LM393TL এর জন্য উপযুক্ত 6 অ্যাপ্লিকেশনs: Industrial Threshold and Over-Voltage Monitoring, Battery-Powered Sensor Threshold Detection, Zero-Cross and AC Level Detection, Open-Drain Level Shifting and Bus Interfacing, Temperature and Fan Control in Consumer Equipment, Automotive and 24 V Vehicle Electrical Modules.
Industrial Threshold and Over-Voltage Monitoring
The LM393TL suits 24 V industrial control boards that must flag over- or under-voltage conditions on a supply rail. With a 2 V to 36 V operating range and a common-mode input range extending to ground, one comparator channel can sense a divided 24 V rail against a reference window while the second channel monitors a 5 V logic rail. The open-collector output can directly drive an opto-isolation LED, a relay coil through a suitable driver, or a fault line on an RS-485 transceiver. Trade-off: the 1300 ns response time and 9 mV maximum input offset make it suitable for slow-moving supply conditions rather than fast inrush detection, and the 0 °C to 70 °C rating means unheated factory cabinets should use the LM2903 instead.
সুপারিশকৃত
Battery-Powered Sensor Threshold Detection
In battery-operated IoT and portable sensing nodes, the LM393TL provides low-cost threshold detection on slow-changing sensor signals such as thermistor ramps or fuel-level potentiometers. Because the input common-mode range includes ground, a resistive divider referenced to the cell can be compared directly without biasing the signal above the ground rail. The dual channel allows one comparator to watch the battery supply and the other to watch the sensor, giving an early low-battery warning before the radio starts to droop. Because the output is open collector, a single pull-up to the MCU supply lets the two channels share one interrupt line. Trade-off: at 9 mV maximum offset and 1300 ns response, use a comparator with lower offset for millivolt-level thresholds, and remember the commercial temperature grade limits unheated deployments.
সুপারিশকৃত
Zero-Cross and AC Level Detection
The LM393TL is widely used to detect the zero crossing of a low-level AC signal in motor control, mains monitoring and appliance designs. The wide differential input range of ±38 V allows the input divider network to be referenced to the rectified mains-derived rail while the comparator itself runs from a low-voltage supply. The bipolar input stage handles bipolar signals without the level shifting an op-amp comparator would need. Trade-off: with a 1300 ns response time and open-collector output, the device detects the crossing but cannot drive a fast thyristor gate directly - a buffer stage is required for high dI/dt switching. Use a proper optocoupler and isolation network for mains-connected designs.
সুপারিশকৃত
Open-Drain Level Shifting and Bus Interfacing
Because each LM393TL output is an open collector, the device acts as a bidirectional-capable level shifter when used with a pull-up to the target logic rail, converting 5 V TTL inputs down to 3.3 V CMOS domain thresholds. Two channels can be wired-AND into a shared fault or interrupt line, which is a common technique in multi-board backplanes and legacy peripheral designs. The wide 2 V to 36 V supply means the same part can also be powered from 12 V or 24 V in industrial systems while still driving 5 V logic. Trade-off: the open-collector topology cannot source current, and the pull-up resistor sets the rise time, so high bus capacitance will slow edges well beyond the 1300 ns device specification. Add a Schmitt trigger or a modern comparator if clean, fast edges are required.
সুপারিশকৃত
Temperature and Fan Control in Consumer Equipment
In consumer electronics, servers and networking gear, the LM393TL is used as the comparator stage in simple thermal and airflow control loops, comparing a thermistor or sensor-transducer voltage against a set reference produced by a divider. The open-collector output can directly drive an NPN or PNP driver transistor that switches a small fan or disables a drive, and the wide supply range lets the comparator sit directly on a 12 V or 24 V rail in the same enclosure as the fan driver. The dual channel covers two independent thermal zones. Trade-off: the 9 mV offset maps to several degrees of error on a typical NTC network, so a dedicated temperature controller is preferable where accuracy matters; the LM393TL remains ideal where a coarse threshold and low cost are the priority.
সুপারিশকৃত
Automotive and 24 V Vehicle Electrical Modules
The LM393TL open-collector topology is used in 24 V vehicle electrical modules for load dump and battery monitoring because the differential input range of ±38 V tolerates automotive transients beyond the 2 V to 36 V supply operating window. The collector output can sink the current for a status LED, a warning buzzer or a discrete load switch, and can be wired-AND with other fault lines. The commercial-grade 0 °C to 70 °C rating of the LM393TL, however, is not adequate for a vehicle environment - the extended-grade LM2903 or an AEC-Q100-qualified comparator such as the TLV1702 family should be selected for production automotive designs, with the LM393TL reserved for prototypes and non-conforming equipment.
সুপারিশকৃত
সুপারিশকৃত পণ্যের সারসংক্ষেপ
এর জন্য ইঞ্জিনিয়ারিং রেফারেন্স ডেটা LM393TL — তুলনা, ডিজাইন গাইডেন্স এবং কমপ্লায়েন্স তথ্য।
নির্বাচন গাইড
বিকল্পের সাথে তুলনা
| পারামিটার | এই পণ্য | LM393B | LM393LV | LM2903 | LM2903B |
|---|---|---|---|---|---|
| Package | 8-DSBGA (8-WFBGA) | 8-DSBGA (8-WFBGA) - same | 8-DSBGA (8-WFBGA) - same | 8-DSBGA (8-WFBGA) - same | 8-DSBGA (8-WFBGA) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Supply Voltage Range | 2 V to 36 V (±1 V to ±18 V) | 2 V to 36 V (±1 V to ±18 V) | Up to approximately 5.5 V (low-voltage variant) | 2 V to 36 V (±1 V to ±18 V) | 2 V to 36 V (±1 V to ±18 V) |
| Number of Elements | 2 | 2 | 2 | 2 | 2 |
| Output Type | Open-Collector | Open-Collector | Open-Collector | Open-Collector | Open-Collector |
| Operating Temperature Range | 0 °C to 70 °C | 0 °C to 70 °C | 0 °C to 70 °C | -40 °C to 125 °C | -40 °C to 125 °C |
| AEC-Q100 Qualification | Not qualified | Not qualified | Not qualified | Not qualified | Not qualified |
মূল পার্থক্যসমূহ
- Dual open-collector channels in a compact 8-DSBGA land grid array rather than a leaded SOIC-8 (বনামLM393 in SOIC-8 (LM393DR))
- Wide 2 V to 36 V single-supply operation with ±38 V differential input range (বনামLM393LV)
- Documented drop-in upgrade path within the same footprint (বনামLM393B)
- Cost-optimised general-purpose positioning versus qualified modern comparators (বনামTLV1702-Q1)
ডিজাইন নোট
The most frequent LM393TL design error is forgetting the pull-up resistor. Both outputs are open collector, so without an external pull-up (2 kΩ to 10 kΩ is typical) the output floats and the following logic gate reads an indeterminate state. A second common error is pulling the output up to a rail higher than the device's absolute maximum supply rating - the collector-emitter voltage limit, not the supply pin, is the constraint that matters. Finally, note that the LM393TL is a commercial-grade 0 °C to 70 °C part; using it in an unheated industrial enclosure will produce offset drift and, eventually, out-of-spec behaviour.
The LM393TL uses an 8-WFBGA land grid array, so the PCB footprint must include the correct ball pads, solder mask openings and paste stencil apertures, and the exposed centre pad must be soldered and tied to ground for thermal and return-path performance. Because the inputs are high-impedance bipolar nodes, keep the input traces short, route them away from the output traces (the output switches 0 V to the pull-up rail), and place the pull-up resistor directly at the OUT pins rather than at the load. Provide a solid ground plane connection at the GND ball; a floating or split ground on a BGA makes the offset specification effectively meaningless.
Open-collector outputs have a slow rising edge: the 1300 ns response time quoted for the LM393TL is dominated by the pull-up resistor and the load capacitance, not by the input stage. With a 10 kΩ pull-up and 50 pF of load, the 10-90% rise time is roughly 1.1 µs, so at 100 kHz or more the duty cycle will be noticeably distorted. Keep pull-up values as low as the sink current budget allows (2 kΩ to 4.7 kΩ is common), minimise output trace capacitance, and add a Schmitt-trigger stage if the signal is re-sampled by a digital input.
Estimated: the LM393TL consumes low supply current in the microampere-to-milliampere class (exact per-channel value is [DATA_NEEDED: supply current per channel]), so power dissipation is dominated by the output stage rather than the bias network. Estimated from the published 1300 ns response time and an assumed 4.7 kΩ pull-up at 5 V, peak sink current is about 1 mA during output transitions, giving well under 10 mW dissipation in the device and no need for thermal derating. The real system concern is the pull-up resistor's own dissipation during a sustained low output, which should be checked against the logic rail's total current budget.
কমপ্লায়েন্স তথ্য
The verified manufacturer and distributor pages for the LM393TL orderable code (8-DSBGA, tape and reel) do not explicitly state RoHS, REACH, lead-free or halogen-free status; obtain the current EU Declaration of Conformity and material declaration from Texas Instruments for the exact orderable part number. The LM393TL is a commercial-grade 0 °C to 70 °C part and is not AEC-Q100 qualified; use the LM2903 for industrial temperature range or a qualified comparator for automotive designs.
