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LM311DG Equivalent & Substitute Parts
Part Overview
The LM311DG is a general-purpose comparator IC manufactured by onsemi in 8-SOIC surface mount packaging. This device operates across a wide supply voltage range (5V ~ 30V single supply, ±2.5V ~ 15V dual supply) and features open-collector/open-emitter output configurations suitable for DTL, MOS, RTL, and TTL logic interfacing. The LM311DG is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | LM311DG |
| Manufacturer | onsemi |
| Category | Linear Comparator |
| Type | General Purpose |
| Number of Elements | 1 |
| Output Type | DTL, MOS, Open-Collector, Open-Emitter, RTL, TTL |
| Voltage - Supply, Single/Dual (±) | 5V ~ 30V, ±2.5V ~ 15V |
| Voltage - Input Offset (Max) | 7.5mV @ ±15V |
| Current - Input Bias (Max) | 0.25µA @ ±15V |
| Current - Quiescent (Max) | 7.5mA |
| Operating Temperature | 0°C ~ 70°C |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the LM311DG is determined by the following critical parameters:
Primary Substitution Criteria:
- Package type: 8-SOIC surface mount form factor
- Supply voltage range: Minimum 5V ~ 30V single supply capability
- Input offset voltage: Maximum 7.5mV @ ±15V
- Input bias current: Maximum 0.25µA @ ±15V
- Quiescent current: Maximum 7.5mA
- Output configuration: Open-collector or open-emitter capability
- Operating temperature: 0°C ~ 70°C minimum range
Substitution Categories:
Direct Substitutes maintain identical electrical specifications and output characteristics, enabling pin-for-pin replacement with no circuit modifications.
Upgrade Substitutes offer equivalent or superior performance within the same package, with active product status providing long-term availability advantages over the obsolete LM311DG.
Similar Substitutes share the same base functionality and package but may have relaxed specifications (lower input offset voltage, reduced quiescent current) or extended temperature ranges, requiring design verification for specific applications.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Supply Voltage (Single/Dual) | Input Offset (Max) | Input Bias (Max) | Quiescent Current (Max) | Output Type | Operating Temp | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| LM311DG | onsemi | Obsolete | 5V ~ 30V, ±2.5V ~ 15V | 7.5mV @ ±15V | 0.25µA @ ±15V | 7.5mA | DTL, MOS, Open-Collector, Open-Emitter, RTL, TTL | 0°C ~ 70°C | REACH Unaffected |
| LM311DT | STMicroelectronics | Active | 5V ~ 30V, ±2.5V ~ 15V | 7.5mV @ ±15V | 0.25µA @ ±15V | 7.5mA | DTL, MOS, Open-Collector, Open-Emitter, RTL, TTL | 0°C ~ 70°C | ROHS3 Compliant |
| LM311MX/NOPB | Texas Instruments | Active | 5V ~ 36V, ±2.5V ~ 18V | 7.5mV @ ±15V | 0.25µA @ ±15V | 7.5mA | DTL, MOS, Open-Collector, Open-Emitter, RTL, TTL | 0°C ~ 70°C | ROHS3 Compliant |
| LP311DR | Texas Instruments | Active | 4.6V ~ 30V, ±1.75V ~ 15V | 7.5mV @ ±15V | 0.1µA @ ±15V | 300µA | Open-Collector, Open-Emitter | 0°C ~ 70°C | ROHS3 Compliant |
| LM311M | National Semiconductor | Active | 5V ~ 30V, ±2.5V ~ 15V | 7.5mV @ 15V | 0.25µA @ 15V | 7.5mA | Open-Collector, Open-Emitter | 0°C ~ 70°C | REACH Unaffected |
| LM311MX | National Semiconductor | Obsolete | 5V ~ 30V, ±2.5V ~ 15V | 7.5mV @ 15V | 0.25µA @ 15V | 7.5mA | Open-Collector, Open-Emitter | 0°C ~ 70°C | Not specified |
| LM211D | STMicroelectronics | Active | 5V ~ 30V, ±2.5V ~ 15V | 3mV @ ±15V | 0.1µA @ ±15V | 6mA | DTL, MOS, Open-Collector, Open-Emitter, RTL, TTL | -40°C ~ 105°C | ROHS3 Compliant |
| LM211DT | STMicroelectronics | Active | 5V ~ 30V, ±2.5V ~ 15V | 3mV @ ±15V | 0.1µA @ ±15V | 6mA | DTL, MOS, Open-Collector, Open-Emitter, RTL, TTL | -40°C ~ 105°C | ROHS3 Compliant |
| LM311D | National Semiconductor | Obsolete | 4.6V ~ 30V, ±1.75V ~ 15V | 7.5mV @ ±15V | 0.25µA @ ±15V | 7.5mA | MOS, Open-Collector, Open-Emitter, TTL | 0°C ~ 70°C | RoHS non-compliant |
| LM311DE4 | Texas Instruments | Obsolete | 4.6V ~ 30V, ±1.75V ~ 15V | 7.5mV @ ±15V | 0.25µA @ ±15V | 7.5mA | MOS, Open-Collector, Open-Emitter, TTL | 0°C ~ 70°C | ROHS3 Compliant |
Engineering Selection Recommendations
Recommended Primary Substitute: LM311DT (STMicroelectronics)
The LM311DT provides direct electrical and functional equivalence to the LM311DG with identical supply voltage range, input offset voltage, input bias current, and quiescent current specifications. Active product status ensures long-term availability and supply chain continuity. ROHS3 compliance satisfies modern regulatory requirements. Cut Tape and Digi-Reel packaging options support both prototype and production volumes.
Recommended Secondary Substitute: LM311MX/NOPB (Texas Instruments)
The LM311MX/NOPB maintains electrical equivalence while offering extended supply voltage capability (5V ~ 36V single supply, ±2.5V ~ 18V dual supply). Active product status and ROHS3 compliance provide regulatory alignment. This part accommodates applications requiring higher supply voltage margins.
Alternative Substitute: LM311M (National Semiconductor)
The LM311M delivers equivalent electrical performance within the standard supply voltage range. Active product status supports ongoing procurement. Output configuration is limited to open-collector and open-emitter types, eliminating DTL, MOS, and RTL output options present in the LM311DG.
Extended Temperature Alternative: LM211D or LM211DT (STMicroelectronics)
The LM211 series offers superior specifications with lower input offset voltage (3mV vs. 7.5mV) and reduced quiescent current (6mA vs. 7.5mA). Extended operating temperature range (-40°C ~ 105°C) accommodates industrial and automotive applications. Active product status and ROHS3 compliance are standard. These parts are suitable for applications where improved precision and wider temperature operation are beneficial.
Not Recommended: LP311DR (Texas Instruments)
While functionally compatible, the LP311DR exhibits significantly higher quiescent current (300µA vs. 7.5mA), making it unsuitable for power-sensitive applications. Lower minimum supply voltage (4.6V vs. 5V) and reduced input bias current (0.1µA vs. 0.25µA) represent specification changes requiring design verification.
Not Recommended: Obsolete Alternatives (LM311MX, LM311D, LM311DE4)
These parts carry obsolete product status, negating the primary advantage of substitution. Procurement risk and supply discontinuation make them unsuitable for new designs or long-term production support.
Frequently Asked Questions (FAQ)
Q: Can LM311DT be used as a direct replacement for LM311DG?
A: Yes. The LM311DT maintains identical electrical specifications including supply voltage range (5V ~ 30V, ±2.5V ~ 15V), input offset voltage (7.5mV @ ±15V), input bias current (0.25µA @ ±15V), and quiescent current (7.5mA). Both devices use 8-SOIC packaging with identical pinout. No circuit modifications are required.
Q: What is the key difference between LM311MX/NOPB and LM311DG?
A: The LM311MX/NOPB extends the maximum supply voltage to 36V (single supply) and ±18V (dual supply) compared to the LM311DG's 30V and ±15V limits. All other electrical parameters remain equivalent. This extended voltage capability accommodates higher supply margin applications.
Q: Why is LM211D considered a similar substitute rather than a direct substitute?
A: The LM211D offers improved specifications (lower input offset voltage of 3mV vs. 7.5mV, reduced quiescent current of 6mA vs. 7.5mA) and extended operating temperature range (-40°C ~ 105°C vs. 0°C ~ 70°C). These differences require design verification to confirm compatibility with existing circuit requirements, particularly in applications sensitive to input offset voltage or operating at temperature extremes.
Q: Is the LP311DR suitable for low-power applications?
A: No. The LP311DR exhibits quiescent current of 300µA, approximately 40 times higher than the LM311DG's 7.5mA specification. This makes it unsuitable for battery-powered or power-constrained designs. The LP311DR is appropriate only for applications where higher quiescent current is acceptable.
Q: What packaging options are available for substitute parts?
A: LM311DT is available in Cut Tape (CT) and Digi-Reel packaging for production volumes. LM211D is supplied in Tube packaging. LM211DT is available in Cut Tape and Digi-Reel formats. All substitute parts maintain the 8-SOIC (0.154", 3.90mm Width) surface mount package identical to the LM311DG.
Q: Are substitute parts RoHS compliant?
A: LM311DT, LM311MX/NOPB, LM211D, and LM211DT are ROHS3 compliant. LM311M and LM311MX carry REACH Unaffected status. The obsolete LM311D is RoHS non-compliant. Regulatory compliance requirements should guide part selection for applications subject to environmental directives.
Q: Can I use LM311M as a substitute if DTL and RTL output options are not required?
A: Yes, if your circuit design uses only open-collector or open-emitter output configurations. The LM311M provides equivalent electrical performance and active product status. However, if any circuit path requires DTL, MOS, or RTL output capability, the LM311M is not suitable. LM311DT or LM211D series are preferred for full output flexibility.
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