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Texas Instruments LM393BIDR
- Part No.:
- LM393BIDR
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM393BIDR.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:129
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Product details
Overview
LM393BIDR from Texas Instruments is a dual precision voltage comparator IC designed for single-supply operation across 2 V to 36 V. It delivers ±0.37 mV input offset voltage, 1 µs propagation delay, 200 µA per comparator supply current, and operates from –40°C to +85°C in an SOIC-8 package. It serves as a high-reliability signal-level decision element in power supply monitoring and motor control feedback loops.
For engineers reviewing the LM393BIDR datasheet, LM393BIDR pinout, LM393BIDR application, or LM393BIDR equivalent, key selection criteria include its 36 V absolute max supply rating, rail-to-rail input common-mode range down to ground, open-collector TTL/CMOS/MOS-compatible outputs, low 3.5 nA input bias current, and drop-in compatibility with legacy LM393/LM2903 designs.
Technical Context
The LM393BIDR implements two independent comparators with dedicated ESD clamps enabling 2 kV HBM robustness. Its input stage supports differential voltages up to ±38 V and common-mode inputs extending to VCC – 2 V while allowing one input to reach full VCC without damage or malfunction.
Quiescent current remains stable across supply voltage (2–36 V) and temperature (–40°C to +85°C), and output saturation voltage stays below 400 mV at 4 mA sink load - critical for interfacing with logic families requiring clean low-state definition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 36 V - enables direct use in 3.3 V, 5 V, 12 V, and 24 V industrial systems without level-shifting. |
| Input Offset Voltage (max) | ±4 mV over temperature - ensures accurate threshold detection in precision voltage monitoring applications. |
| Propagation Delay | 1 µs typical - supports fast response in overvoltage protection and PWM timing circuits. |
| Input Bias Current (typ) | 3.5 nA - minimizes loading on high-impedance sensor sources like thermistors or photodiodes. |
| Output Type | Open-collector - allows wired-OR configuration and flexible pull-up to any logic rail (TTL/CMOS/MOS). |
| ESD Rating (HBM) | 2000 V - meets industrial handling requirements without additional external protection. |
| Operating Temperature | –40°C to +85°C - qualified for extended ambient conditions in factory automation and server PSU environments. |
Pinout & Package
LM393BIDR is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package measuring 4.90 mm × 3.91 mm, with standard JEDEC MS-012AC footprint and gull-wing leads for surface-mount assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OUT | Comparator 1 output | Open-collector output requiring external pull-up; sinks current when comparator 1 output is active low. |
| 1IN− | Comparator 1 inverting input | Negative reference input node; accepts signals within common-mode range (GND to VCC − 2 V). |
| 1IN+ | Comparator 1 non-inverting input | Positive signal input; supports same common-mode range as 1IN−, and may go up to VCC. |
| GND | Ground reference | System ground return path for both comparators and internal circuitry; must be low-impedance. |
| VCC | Positive supply | Single power rail connection; supports up to 36 V DC with no reverse polarity protection required. |
| 2IN+ | Comparator 2 non-inverting input | Independent positive input for second comparator; electrically isolated from first comparator's inputs. |
| 2IN− | Comparator 2 inverting input | Independent negative input for second comparator; shares same voltage range and ruggedness as 1IN−. |
| 2OUT | Comparator 2 output | Second open-collector output; functionally identical to 1OUT and independently controllable. |
Key Features
| Feature | Design Value |
|---|---|
| Drop-in replacement for LM393/LM2903 | Pin- and function-compatible with legacy parts, enabling upgrade without PCB redesign or firmware changes. |
| Extended supply voltage range | Rated for 36 V max (vs. 30 V for LM393), supporting direct integration into 24 V industrial bus and UPS systems. |
| Low input offset drift | ±0.37 mV typ at 25°C, ±4 mV max over full temperature range - improves accuracy in battery voltage window detection. |
| Rugged input structure | Differential input voltage tolerance of ±38 V and ESD clamps prevent latch-up or damage during transient events. |
| Ground-sensing input capability | Common-mode range includes GND - enables direct comparison of signals referenced to system ground (e.g., current-sense amplifiers). |
Applications
| Overvoltage Protection Circuit | Server Power Supply Monitoring |
|---|---|
Use Scenario: Detecting when DC bus voltage exceeds safe operating limit in telecom rectifiers. IC Role / Device Role / Timing Role: Dual comparator compares sensed bus voltage against two independent thresholds to trigger shutdown or flag fault. Use Value: 1 µs response time enables sub-microsecond reaction to fast transients; 36 V rating avoids external attenuation networks. | Use Scenario: Validating +12 V, +5 V, and +3.3 V rails in multi-output server PSUs before motherboard power-on sequence. IC Role / Device Role / Timing Role: Each comparator monitors one rail against precision reference; outputs feed OR-gated enable signal to main controller. Use Value: ±0.37 mV offset ensures tight margin control; open-collector outputs simplify wired-OR logic with minimal external components. |
| Motor Drive Current Limiting | Appliance Door Interlock Sensing |
Use Scenario: Comparing amplified shunt voltage against programmable limit to disable H-bridge during overcurrent events. IC Role / Device Role / Timing Role: Comparator acts as analog trip detector feeding gate driver enable/disable logic. Use Value: 3.5 nA input bias current prevents error in low-voltage shunt measurements; rail-to-ground input range accommodates bidirectional current sensing. | Use Scenario: Verifying mechanical door closure via microswitch or magnetic reed sensor before enabling heating elements. IC Role / Device Role / Timing Role: Comparator converts switch closure into clean digital enable signal for safety interlock logic. Use Value: 2 kV HBM ESD rating withstands handling in white-goods manufacturing; SOIC-8 package supports automated SMT placement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM393DR | Higher max input offset (±9 mV), 30 V max supply, no enhanced ESD clamps (2 kV HBM retained but less input ruggedness) | Limited to lower-voltage (<30 V), less demanding ESD environments; not rated for 36 V operation | Select LM393DR only if cost sensitivity outweighs need for 36 V headroom and improved input robustness. |
| LM2903BIDR | Identical electrical specs except extended temperature range (–40°C to +125°C) and higher output sink current (25 mA vs. 21 mA) | Suitable for under-hood automotive or high-temp industrial enclosures where ambient exceeds 85°C | Choose LM2903BIDR when operation beyond +85°C is required; otherwise LM393BIDR offers optimal cost/performance for commercial/industrial use. |
Compared with LM393DR and LM2903BIDR, the LM393BIDR provides the best balance of 36 V operation, ±0.37 mV offset, and industrial-grade ESD protection - making it ideal for server PSUs, UPS systems, and factory automation where reliability and voltage margin are critical.
Availability
LM393BIDR is available at Aetrix Electronics and suitable for overvoltage protection circuits, server power supply monitoring, and motor drive current limiting requiring stable component supply and long-term industrial availability.
Supply support for LM393BIDR 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The LM393B series belongs to TI's precision analog comparators product line, engineered specifically for robust, low-power, single-supply voltage comparison in power management, safety interlocks, and sensor interface applications.
FAQ
What is the maximum supply voltage rating for LM393BIDR?
The LM393BIDR has an absolute maximum supply voltage rating of 38 V, with recommended operation up to 36 V. This exceeds the 30 V limit of legacy LM393 variants, enabling direct use in 24 V industrial systems and 36 V battery-powered equipment without external regulation or attenuation.
Does LM393BIDR support ground-referenced input signals?
Yes, LM393BIDR supports common-mode input voltages down to GND (0 V). Its input stage allows either or both inputs to reach the negative rail, making it suitable for detecting zero-crossing, current-sense amplifier outputs, or other ground-referenced analog signals without level-shifting circuitry.
Can LM393BIDR replace LM393DR on an existing PCB?
Yes, LM393BIDR is a drop-in replacement for LM393DR in SOIC-8 packages. Pinout, footprint, and basic functionality are identical. Upgrading requires no layout changes, though designers should verify that the higher 36 V supply rating and improved 2 kV ESD clamps align with system-level stress requirements.
What is the typical input bias current of LM393BIDR?
The typical input bias current of LM393BIDR is 3.5 nA at 25°C, with a maximum of 25 nA over the full –40°C to +85°C temperature range. This ultra-low bias minimizes loading errors in high-impedance sensor interfaces such as thermistor networks or photodiode transimpedance stages.
Is LM393BIDR compatible with TTL and CMOS logic families?
Yes, LM393BIDR features open-collector outputs compatible with TTL, CMOS, and MOS logic families. When used with an appropriate pull-up resistor (e.g., 4.7 kΩ to 5 V), it delivers clean logic-level transitions and can directly drive inputs of microcontrollers, FPGAs, or discrete logic gates without additional buffering.
LM393BIDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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 (±):
- 3V ~ 36V
- :
- 2mV @ 30V
- Voltage - Input Offset (Max):
- 0.25µA @ 5V
- Current - Input Bias (Max):
- 21mA @ 5V
- Current - Output (Typ):
- 600µA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- 1000ns
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
LM393BIDR FAQ
1.How can I place an order for LM393BIDR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM393BIDR 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 LM393BIDR reliable?
The price and inventory of LM393BIDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM393BIDR is usually 5 days.
3.What payment methods are accepted for LM393BIDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM393BIDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM393BIDR?
LM393BIDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM393BIDR 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 LM393BIDR?
For technical support, including LM393BIDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM393BIDR requirements.
6.How does Aetrix verify that LM393BIDR is sourced from the original manufacturer or authorized distributors?
All LM393BIDR 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 LM393BIDR meets industry standards.
7.What is the process for return or replacement of LM393BIDR?
All LM393BIDR units undergo pre-shipment inspection (PSI). If there is an issue with LM393BIDR, 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 LM393BIDR part is unused and in its original packaging.
Return procedure for LM393BIDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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