{"id":7923,"date":"2026-06-28T04:28:50","date_gmt":"2026-06-28T04:28:50","guid":{"rendered":"https:\/\/materialparts.com\/lm393n-2\/"},"modified":"2026-06-28T11:46:01","modified_gmt":"2026-06-28T11:46:01","slug":"lm393n-2","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/lm393n-2\/","title":{"rendered":"LM393N"},"content":{"rendered":"

\u4ea7\u54c1\u6982\u89c8<\/h2>\n

The LM393N from Texas Instruments is a dual differential comparator with open-collector outputs, single-supply operation (2V to 36V), ground-sensing inputs, and low supply current (500\u00b5A for both) in a PDIP-8 package.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u901a\u9053\u6570<\/td>\n2 (dual)<\/td>\n<\/tr>\n
Supply Voltage Range<\/td>\n2V to 36V (single) or \u00b11V to \u00b118V (dual)<\/td>\n<\/tr>\n
\u8f93\u5165\u5931\u8c03\u7535\u538b<\/td>\n2mV typical, 5mV max @ 25\u00b0C<\/td>\n<\/tr>\n
\u8f93\u5165\u504f\u7f6e\u7535\u6d41<\/td>\n25nA typical, 250nA max<\/td>\n<\/tr>\n
Input Offset Current<\/td>\n5nA typical, 50nA max<\/td>\n<\/tr>\n
Common-Mode Input Range<\/td>\n0V to VCC-1.5V (includes ground)<\/td>\n<\/tr>\n
Differential Input Voltage<\/td>\n\u00b136V max<\/td>\n<\/tr>\n
\u8f93\u51fa\u7c7b\u578b<\/td>\nOpen-collector (NPN, requires pull-up resistor)<\/td>\n<\/tr>\n
Output Sink Current<\/td>\n6mA typical @ VOL=1.5V<\/td>\n<\/tr>\n
Output Saturation Voltage<\/td>\n250mV max @ Isink=4mA<\/td>\n<\/tr>\n
Response Time<\/td>\n1.3\u00b5s typical (TTL-level step)<\/td>\n<\/tr>\n
Supply Current (both)<\/td>\n0.4mA typical, 1mA max @ 5V<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n0\u00b0C to +70\u00b0C<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nPDIP-8 (9.81 x 6.35mm)<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • Dual independent differential comparators<\/li>\n
  • Wide supply range: 2V to 36V single supply<\/li>\n
  • Input common-mode range includes ground<\/li>\n
  • Open-collector outputs for wired-OR<\/li>\n
  • Low supply current: 0.4mA for both comparators<\/li>\n
  • Low input offset voltage: 2mV typical<\/li>\n
  • Wide differential input voltage: \u00b136V<\/li>\n
  • Output compatible with TTL, MOS, and CMOS<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Voltage comparison and threshold detection<\/li>\n
    • Battery monitoring and low-battery detection<\/li>\n
    • Window comparator circuits<\/li>\n
    • Zero-crossing detection<\/li>\n
    • Oscillator and timing circuits<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The LM393N from Texas Instruments is a dual differential comparator with open-collector outputs, single-supply operation (2V to 36V), ground-sensing inputs, and low supply current (500\u00b5A for both) in a PDIP-8 package. Key Specifications Number of Channels 2 (dual) Supply Voltage Range 2V to 36V (single) or \u00b11V to \u00b118V (dual) Input Offset Voltage […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,25],"tags":[],"chip_brand":[138],"class_list":["post-7923","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-microcontrollers-mcu","chip_brand-ti"],"acf":{"brief_explanation":"Dual comparator, open-collector, 2-36V, GND-sensing, 1.3\u00b5s, PDIP-8","date_code":"","package_case":"PDIP-8 (9.81 x 6.35 x 4.57mm, 2.54mm pitch, through-hole)","in_stock":12000,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/lm393-n.pdf","price":"$0.24 @ 1ku","product_introduction":"The LM393N from Texas Instruments is a dual differential comparator\u2014the comparator counterpart of the LM358 op-amp. Unlike an op-amp, the LM393 has an open-collector output that can only sink current (pull LOW) and requires an external pull-up resistor to produce a HIGH output. This open-collector architecture enables wired-OR connections: multiple LM393 outputs can share a single pull-up resistor, and any comparator pulling LOW dominates. The input common-mode range includes ground (0V), allowing single-supply operation for comparing signals near ground. The 1.3\u00b5s response time is suitable for most DC and low-frequency comparison tasks. The \u00b136V differential input voltage range allows the two inputs to differ by up to 36V without damage, useful when comparing signals from different voltage domains. The N suffix denotes the PDIP-8 through-hole package.","working_principle":"The LM393N consists of two independent voltage comparators. Each comparator has an inverting input (-), a non-inverting input (+), and an open-collector output. The comparator continuously compares the voltage at the + input with the voltage at the - input. When V+ > V-, the output transistor is OFF, and the external pull-up resistor pulls the output HIGH. When V+ < V-, the output transistor turns ON, sinking current through the pull-up resistor and pulling the output LOW. There is no negative feedback; the comparator operates open-loop with very high gain, so even a tiny difference between inputs drives the output to one rail or the other. The 2mV typical offset voltage means the switching point may be shifted by up to 5mV from the ideal threshold. The 1.3\u00b5s response time includes the internal propagation delay plus the time for the output transistor to switch. In a battery monitor application, the + input connects to a voltage divider from the battery, and the - input connects to a reference voltage (e.g., from a zener or TL431). When the battery voltage drops below the threshold, V+ < V-, and the output goes LOW, triggering an interrupt or LED indicator.","pin_description":"\n
      Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>\n
      1<\/td>OUT A<\/td>Output<\/td>Comparator A output (open-collector, requires pull-up)<\/td><\/tr>\n
      2<\/td>IN- A<\/td>Input<\/td>Comparator A inverting input<\/td><\/tr>\n
      3<\/td>IN+ A<\/td>Input<\/td>Comparator A non-inverting input<\/td><\/tr>\n
      4<\/td>GND \/ V-<\/td>Power<\/td>Ground or negative supply<\/td><\/tr>\n
      5<\/td>IN+ B<\/td>Input<\/td>Comparator B non-inverting input<\/td><\/tr>\n
      6<\/td>IN- B<\/td>Input<\/td>Comparator B inverting input<\/td><\/tr>\n
      7<\/td>OUT B<\/td>Output<\/td>Comparator B output (open-collector, requires pull-up)<\/td><\/tr>\n
      8<\/td>V+<\/td>Power<\/td>Positive supply (2V to 36V)<\/td><\/tr>\n<\/table>\n

      LM393N uses the PDIP-8 package with standard dual comparator pinout: Pin 1 = Output A (open-collector), Pin 2 = Inverting Input A (-), Pin 3 = Non-inverting Input A (+), Pin 4 = GND, Pin 5 = Non-inverting Input B (+), Pin 6 = Inverting Input B (-), Pin 7 = Output B (open-collector), Pin 8 = VCC. The open-collector outputs require external pull-up resistors to VCC or a separate logic supply. This allows output level shifting \u2014 the pull-up voltage can differ from VCC. Maximum output sink current is 16mA. Input common-mode range includes ground. Pinout is identical to LM2903, LM393A, and LM2903V comparators.<\/p>","application_scenarios":"

        \n
      • Battery Monitor:<\/strong> IN+ from battery divider, IN- from TL431 (2.5V ref); output LOW when battery < threshold; LED indicator<\/li>\n
      • Window Comparator:<\/strong> Two comparators with different thresholds; wired-OR outputs; LOW when signal is outside window<\/li>\n
      • Zero Crossing:<\/strong> AC signal through resistor to IN+, IN- at GND; output transitions at each zero crossing<\/li>\n
      • Overcurrent Detect:<\/strong> Current sense amp output to IN+, threshold on IN-; output goes LOW on overcurrent<\/li>\n
      • RC Oscillator:<\/strong> Positive feedback via resistor divider; timing via RC on IN-; free-running square wave output<\/li>\n<\/ul>","alternative_models":"\n
        Model<\/th>Manufacturer<\/th>Key Difference<\/th>Package<\/th>Specs<\/th><\/tr>\n
        LM393AN<\/td>TI<\/td>Improved version with lower 2mV max offset voltage for precision threshold detection circuits<\/td>DIP-8<\/td>1.3\u00b5s\/2-36V<\/td><\/tr>\n
        LM2903N<\/td>TI<\/td>Automotive-grade -40 to +125C version for under-hood and industrial comparator applications<\/td>DIP-8<\/td>1.3\u00b5s\/-40-125C<\/td><\/tr>\n
        LM339N<\/td>TI<\/td>Quad comparator version (4 channels) in DIP-14 for multi-channel threshold detection<\/td>DIP-14<\/td>1.3\u00b5s\/4-ch<\/td><\/tr>\n
        TLV3202AIDR<\/td>TI<\/td>High-speed 40ns dual comparator with push-pull output for fast signal detection<\/td>SOIC-8<\/td>40ns\/2.7-5.5V<\/td><\/tr>\n
        LTC6702IS8<\/td>ADI<\/td>Micro-power 18-bit configurable comparator with 200nA supply for battery monitoring<\/td>SOIC-8<\/td>18-bit\/200nA<\/td><\/tr>\n<\/table>\n

        LM393 is the industry-standard dual voltage comparator with open-drain output and 2-36V supply range. The 1.3\u00b5s response time suits general-purpose threshold detection. LM393AN offers lower offset voltage. LM339 provides 4 comparators in DIP-14. For high-speed applications, TLV3202 offers 40ns response with push-pull output at 2.7-5.5V supply.<\/p>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7923","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/comments?post=7923"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7923\/revisions"}],"predecessor-version":[{"id":8236,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7923\/revisions\/8236"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=7923"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=7923"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=7923"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=7923"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}