My Inquiry
My Account
Texas Instruments LM393APSR
- Part No.:
- LM393APSR
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
LM393APSR.pdf
- Description:
- IC COMPARATOR 2 DIFF 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,991
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM393APSR from Texas Instruments is a dual voltage comparator IC designed for single-supply operation across 2 V to 30 V, featuring ±4 mV max input offset voltage, 1.3 µs typical propagation delay, and rail-to-rail input common-mode range including ground - widely deployed in server PSU overvoltage protection circuits.
For engineers reviewing the LM393APSR datasheet, LM393APSR pinout, LM393APSR application, or LM393APSR equivalent, this page delivers verified electrical specs, package mapping to SOIC-8, real-world use cases in industrial power monitoring, and validated alternative options for design continuity.
Technical Context
The LM393APSR implements two independent open-collector comparators with internal ESD clamps, enabling robust input tolerance up to ±36 V differential and operation down to 0 V common-mode input. Its quiescent current remains stable across supply voltage (0.45–2.5 mA), supporting wide-input-range sensing without bias dependency.
It features TTL/MOS/CMOS-compatible outputs, low output saturation voltage (130–700 mV at 4 mA sink), and guaranteed performance over 0°C to +70°C ambient - distinguishing it from B-version variants (e.g., LM393B) which extend temperature range and reduce offset but share identical pinout and functional architecture.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 30 V - supports direct integration into 3.3 V, 5 V, 12 V, and 24 V industrial power rails without level-shifting. |
| Input Offset Voltage (max) | ±4 mV - ensures accurate threshold detection in precision voltage monitoring applications like battery charge control. |
| Propagation Delay (typ) | 1.3 µs - enables fast response to transient overvoltage events in server PSU protection circuits. |
| Input Bias Current (max) | –400 nA - minimizes loading on high-impedance sensor networks such as thermistor-based temperature monitors. |
| Output Sink Current (min) | 6 mA - drives standard pull-up resistors (e.g., 5.1 kΩ to 5 V) and interfaces directly with microcontroller GPIOs or optocouplers. |
| Common-Mode Input Range | 0 V to (VCC – 2 V) - allows ground-referenced inputs and simplifies design of zero-crossing detectors or level-shifted signal conditioning. |
Pinout & Package
LM393APSR is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm body size) with standard industry footprint and thermal characteristics (RθJA = 148.5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OUT | Comparator 1 Output | Open-collector output requiring external pull-up; sinks current when IN+ < IN−. |
| 1IN− | Comparator 1 Inverting Input | Negative reference input; accepts signals within common-mode range (0 V to VCC − 2 V). |
| 1IN+ | Comparator 1 Non-Inverting Input | Signal input for threshold comparison; tolerant of overvoltage up to VCC. |
| GND | Ground Reference | System return path for both comparators and internal circuitry; must be low-impedance. |
| 2IN+ | Comparator 2 Non-Inverting Input | Independent signal input; shares same voltage range and ESD ruggedness as 1IN+. |
| 2IN− | Comparator 2 Inverting Input | Independent reference input; supports separate thresholds for dual-sensing functions. |
| 2OUT | Comparator 2 Output | Second open-collector output; electrically isolated from 1OUT for independent load control. |
| VCC | Positive Supply | Single supply rail (2–30 V); powers both comparators with supply-current independence from voltage. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent comparators | Enables simultaneous monitoring of two distinct voltage thresholds (e.g., overvoltage and undervoltage) in compact space-constrained designs. |
| Open-collector outputs | Allows wired-OR logic, level translation across domains (e.g., 5 V logic driving 3.3 V MCU interrupt), and direct interface to optocouplers or relays. |
| Rail-to-rail input common-mode range | Supports ground-referenced inputs without external biasing, reducing component count in battery-monitoring and motor-control feedback paths. |
| ESD rating (HBM) | 2000 V - meets industrial handling requirements and reduces need for external protection in board-level ESD zones. |
| Low quiescent current | 0.45–2.5 mA total - enables always-on monitoring in energy-sensitive applications like building automation sensors. |
Applications
| Server Power Supply Monitoring | Industrial Motor Drive Protection |
|---|---|
|
Use Scenario: Real-time detection of overvoltage and undervoltage faults on +12 V and +5 V rails in redundant server PSUs. IC Role / Device Role / Timing Role: Dual comparator performs independent threshold comparisons with <1.3 µs response, triggering shutdown before downstream damage occurs. Use Value: Prevents catastrophic failure by enabling sub-millisecond fault isolation while maintaining compatibility with legacy TI comparator footprints. |
Use Scenario: Monitoring phase current and bus voltage in 3-phase inverter gate driver stages to prevent IGBT shoot-through. IC Role / Device Role / Timing Role: One comparator detects current-limit threshold via shunt amplifier output; second monitors DC-link voltage sag during regenerative braking. Use Value: Enables deterministic, hardware-level protection independent of MCU firmware latency - critical for SIL-2 functional safety compliance. |
| Appliance Energy Management | Building Automation Sensor Interface |
|
Use Scenario: Threshold detection of thermistor and NTC voltage dividers in smart HVAC control units for fan speed staging and compressor lockout. IC Role / Device Role / Timing Role: Compares analog sensor outputs against fixed reference voltages to generate discrete control signals for relay drivers. Use Value: Eliminates ADC and software polling overhead, reducing BOM cost and improving reliability in high-noise residential environments. |
Use Scenario: Interfacing 0–10 V lighting control signals and 4–20 mA smoke detector loops in commercial楼宇 controllers. IC Role / Device Role / Timing Role: Converts analog control levels into clean digital logic states for DALI or BACnet gateway microcontrollers. Use Value: Provides galvanically isolated, noise-immune signal conditioning without requiring precision op-amps or external references. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM393DR | Same SOIC-8 package, identical electrical specs (±4 mV offset, 1.3 µs delay), but rated for 0°C to +70°C only - no extended temp grade. | No difference in server PSU or appliance use; unsuitable for automotive under-hood or industrial edge nodes above 70°C ambient. | Select LM393DR if cost sensitivity outweighs long-term temperature margin and full LM393APSR qualification is not required. |
| LM2903PSR | SOIC-8 variant with wider temp range (–40°C to +125°C) and higher max supply (32 V), but ±15 mV offset and slower 1.3 µs delay (same typ value, higher max variation). | Better suited for motor drive junction-temperature monitoring; less precise for fine-threshold battery cutoff or precision reference comparison. | Choose LM2903PSR where extended temperature operation and higher supply headroom are mandatory, accepting reduced offset accuracy. |
Compared with LM393DR and LM2903PSR, the LM393APSR delivers optimal balance of precision (±4 mV offset), speed (1.3 µs), and industrial-grade packaging (PSR suffix denotes tape-and-reel with enhanced moisture sensitivity level), making it ideal for volume production of certified power management modules.
Availability
LM393APSR is available at Aetrix Electronics and suitable for server PSU monitoring, industrial motor drive protection, and appliance energy management requiring stable component supply across multi-year production cycles.
Supply support for LM393APSR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of leadership in precision analog ICs and industrial-grade components.
The LM393 family was engineered for robust, low-cost voltage comparison in power management and system supervision - prioritizing reliability, wide supply range, and interoperability across generations.
FAQ
What is the maximum supply voltage rating for LM393APSR?
The LM393APSR has an absolute maximum supply voltage of 36 V, but its recommended operating range is 2 V to 30 V per the datasheet's Recommended Operating Conditions table. Exceeding 30 V may compromise long-term reliability and is not guaranteed for parametric performance - always observe derating guidelines for continuous operation in high-temperature environments. The LM393APSR is not rated for 36 V sustained operation like the LM393B variant.
Does LM393APSR support rail-to-rail input operation?
Yes, the LM393APSR supports a common-mode input voltage range from 0 V to (VCC – 2 V), allowing both inputs to operate down to ground potential - a key enabler for ground-referenced sensing. However, inputs may safely exceed the upper limit (up to VCC) without damage, though output behavior is only guaranteed when at least one input stays within the valid common-mode window. This capability is fully documented in Section 5.8 of the LM393APSR datasheet.
Can LM393APSR replace LM393DR in existing designs?
Yes, LM393APSR is a direct drop-in replacement for LM393DR: identical SOIC-8 pinout, matching electrical specifications (±4 mV offset, 1.3 µs propagation delay, 6 mA sink current), and shared temperature range (0°C to +70°C). The "PSR" suffix indicates tape-and-reel packaging with enhanced moisture sensitivity level (MSL 3), making it suitable for automated SMT assembly without process changes. No layout or firmware modifications are required.
What is the output configuration of LM393APSR?
The LM393APSR features two independent open-collector outputs (1OUT and 2OUT), each capable of sinking up to 6 mA at 1.5 V saturation. These outputs require external pull-up resistors to define logic-high voltage levels and enable wired-OR functionality. They are not push-pull or CMOS-compatible in sourcing mode - the device cannot actively drive high, only pull low. This architecture is essential for interfacing with optocouplers, relays, and mixed-voltage logic systems.
Is LM393APSR qualified for industrial temperature operation?
No - the LM393APSR is specified for 0°C to +70°C ambient operation, aligning with commercial-grade temperature qualification. For industrial applications requiring –40°C to +85°C or –40°C to +125°C operation, consider the LM393B or LM2903B variants respectively. The "A" suffix in LM393APSR denotes the original LM393 family grade (not automotive), and its datasheet explicitly lists TA = 0°C to 70°C in Section 5.2 Recommended Operating Conditions.
LM393APSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 2
- Output Type:
- Open-Collector, Rail-to-Rail
- Voltage - Supply, Single/Dual (±):
- 2V ~ 36V, ±1V ~ 18V
- :
- 2mV @ 30V
- Voltage - Input Offset (Max):
- 0.25µA @ 5V
- Current - Input Bias (Max):
- 20mA
- Current - Output (Typ):
- 2.5mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SO
LM393APSR FAQ
1.How can I place an order for LM393APSR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM393APSR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM393APSR reliable?
The price and inventory of LM393APSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM393APSR is usually 5 days.
3.What payment methods are accepted for LM393APSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM393APSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM393APSR?
LM393APSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM393APSR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM393APSR?
For technical support, including LM393APSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM393APSR requirements.
6.How does Aetrix verify that LM393APSR is sourced from the original manufacturer or authorized distributors?
All LM393APSR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM393APSR meets industry standards.
7.What is the process for return or replacement of LM393APSR?
All LM393APSR units undergo pre-shipment inspection (PSI). If there is an issue with LM393APSR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM393APSR part is unused and in its original packaging.
Return procedure for LM393APSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM393APSR Tags
-
LM2903DR
Texas Instruments
-
LM339DR
Texas Instruments
-
LM339PWR
Texas Instruments
-
LM393DT
STMicroelectronics
-
LM2901PWR
Texas Instruments
-
LM2903DT
STMicroelectronics
-
LM393DR
Texas Instruments
-
LM239DR
Texas Instruments
-
LM339APWR
Texas Instruments
-
LM2903P
Texas Instruments
-
LM393ADR
Texas Instruments
-
NCX2200GMAZ
NXP Semiconductors
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
