Specifications
| Type | Description |
|---|---|
| Part Number | LM311 |
| Manufacturer | Texas Instruments |
| Product Type | Operational Amplifier |
| Category | Signal Chain |
| Package / Case | SOIC(8) 4.90 mm x 3.91 mm; PDIP(8) 9.81 mm x 6.35 mm; TSSOP(8) 3.00 mm x 4.40 mm; SO(8) 6.20 mm x 5.30 mm; CDIP(8) 9.60 mm x 6.67 mm; LCCC(20) 8.89 mm x 8.89 mm |
| Response Time | 165 ns; fast response time feature |
| Maximum Input Bias Current | 300 nA; feature list maximum |
| Maximum Input Offset Current | 70 nA; feature list maximum |
| Single Supply Operation | 5 V; can operate from single 5-V supply |
| Output Switching Capability | 50 V at 50 mA; comparator output driving lamps or relays |
| Supply Voltage Absolute Maximum | VCC+ max 18 V; VCC- min -18 V; VCC+ - VCC- max 36 V; over operating free-air temperature range |
| Differential Input Voltage Absolute Maximum | ±30 V; IN+ with respect to IN- |
| Input Voltage Absolute Maximum | ±15 V; either input; magnitude must not exceed supply voltage or ±15 V, whichever is less |
| Emitter Output to VCC- Voltage Absolute Maximum | 30 V; voltage from emitter output to VCC- |
| Collector Output to VCC- Voltage Absolute Maximum | 40 V; LM311 |
| Collector Output to VCC- Voltage Absolute Maximum | 50 V; LM111, LM211, LM211Q |
| Output Short-Circuit Duration | 10 s; short circuit to ground |
| Operating Virtual-Junction Temperature | 150 °C; absolute maximum rating |
| Storage Temperature | -65 to 150 °C; absolute maximum rating |
| ESD Rating HBM | ±500 V; human body model, ANSI/ESDA/JEDEC JS-001 |
| ESD Rating CDM | ±750 V; charged-device model, JEDEC JESD22-C101 |
| Recommended Supply Voltage | 3.5 to 30 V; VCC+ - VCC- |
| Recommended Input Voltage | VCC- + 0.5 V to VCC+ - 1.5 V; |VI| ≤ 15 V |
| Operating Free-Air Temperature Range | 0 to 70 °C; LM311 |
| Operating Free-Air Temperature Range | -40 to 85 °C; LM211 |
| Operating Free-Air Temperature Range | -55 to 125 °C; LM111 |
| Input Offset Voltage | 2 mV typ, 7.5 mV max; LM311, TA=25°C, VCC=±15 V |
| Input Offset Voltage | 10 mV max; LM311, full temperature range, VCC=±15 V |
| Input Offset Current | 6 nA typ, 50 nA max; LM311, TA=25°C, VCC=±15 V |
| Input Offset Current | 70 nA max; LM311, full temperature range, VCC=±15 V |
| Input Bias Current | 100 nA typ, 250 nA max; LM311, TA=25°C, 1 V ≤ VO ≤ 14 V, VCC=±15 V |
| Input Bias Current | 300 nA max; LM311, full temperature range, VCC=±15 V |
| Low-Level Strobe Current | -3 mA typ; V(strobe)=0.3 V, VID≤10 mV, TA=25°C |
| Common-Mode Input Voltage Range Lower Limit | -14.7 V typ, -14.5 V max; full range, VCC=±15 V |
| Common-Mode Input Voltage Range Upper Limit | 13 V min, 13.8 V typ; full range, VCC=±15 V |
| Large-Signal Differential Voltage Amplification | 40 V/mV min, 200 V/mV typ; TA=25°C, 5 V ≤ VO ≤ 35 V, RL=1 kΩ, VCC=±15 V |
| High-Level Collector Output Leakage Current | 0.2 nA typ, 50 nA max; LM311, TA=25°C, VID=5 mV, VOH=35 V |
| Low-Level Collector-to-Emitter Output Voltage | 0.75 V typ, 1.5 V max; TA=25°C, IOL=50 mA, VID=-5 mV or -10 mV |
| Low-Level Collector-to-Emitter Output Voltage | 0.23 V typ, 0.4 V max; full range, VCC+=4.5 V, VCC-=0 V, IOL=8 mA, VID=-6 mV or -10 mV |
| Positive Supply Current | 5.1 mA typ, 7.5 mA max; LM311, TA=25°C, VID=-10 mV, no load, output low |
| Negative Supply Current | -4.1 mA typ, -5 mA max; TA=25°C, VID=10 mV, no load, output high |
| Low-to-High Output Response Time | 115 ns typ; VCC=±15 V, TA=25°C, RC=500 Ω to 5 V, CL=5 pF, 100-mV input step with 5-mV overdrive |
| High-to-Low Output Response Time | 165 ns typ; VCC=±15 V, TA=25°C, RC=500 Ω to 5 V, CL=5 pF, 100-mV input step with 5-mV overdrive |
| Datasheet Status | request_only |
Product Overview
The LM311 is a Texas Instruments single differential voltage comparator in the Signal_Chain category. The extracted datasheet facts list fast comparator operation, including 115 ns typical low-to-high output response time and 165 ns typical high-to-low output response time under ±15 V supply test conditions with a 100 mV input step and 5 mV overdrive.
Input-related specifications include 2 mV typical and 7.5 mV maximum input offset voltage at 25°C, 10 mV maximum across the LM311 full temperature range, 100 nA typical and 250 nA maximum input bias current at 25°C, and 300 nA maximum input bias current over the full LM311 range. Input offset current is specified at 6 nA typical and 50 nA maximum at 25°C, with 70 nA maximum over the full range.
Package options listed in the extracted data include SOIC(8), PDIP(8), TSSOP(8), SO(8), CDIP(8), and LCCC(20). The output can switch 50 V at 50 mA for driving lamps or relays, with a low-level collector-to-emitter voltage of 0.75 V typical at 50 mA under the stated test condition.
Key Features
- Single differential voltage comparator function
- 165 ns fast response time feature
- 115 ns typical low-to-high output response time
- 300 nA maximum input bias current
- 70 nA maximum input offset current
- Single 5 V supply operation supported
- 50 V at 50 mA output switching capability
- Recommended supply range of 3.5 to 30 V
- 0 to 70 °C LM311 operating free-air range
- SOIC, PDIP, TSSOP, SO, CDIP, and LCCC packages
Typical Applications
- Voltage comparison circuits
- Lamp driver outputs
- Relay driver outputs
- Single 5 V supply systems
- Strobe-controlled comparator circuits
- Signal threshold detection
- Open-collector output switching
Procurement Notes
When requesting a quote for LM311, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For analog and signal-chain sourcing, supply voltage, bandwidth, accuracy, noise level, package, temperature grade, input/output configuration and qualification requirements should be verified before approval.
FAQ
What type of device is the LM311?
The LM311 is a Texas Instruments single differential voltage comparator in the Signal_Chain category. The extracted datasheet facts list it with multiple package options, including SOIC(8), PDIP(8), TSSOP(8), SO(8), CDIP(8), and LCCC(20).
What response time is specified for the LM311?
The extracted facts list a 165 ns fast response time feature. Electrical characteristics also specify 115 ns typical low-to-high output response time and 165 ns typical high-to-low output response time under ±15 V supply test conditions.
Can the LM311 operate from a single supply?
Yes. The extracted datasheet facts state that the LM311 can operate from a single 5 V supply. The recommended supply voltage range is listed as 3.5 to 30 V for VCC+ minus VCC-.
What output switching capability is listed for LM311?
The extracted facts list output switching capability of 50 V at 50 mA for comparator output driving lamps or relays. The LM311 collector output to VCC- absolute maximum is listed separately as 40 V.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: July 25, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.