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LM555CM Equivalent & Substitute Parts
Part Overview
The LM555CM is a 555-type timer/oscillator IC manufactured by onsemi in 8-SOIC surface mount packaging. This single timer device operates across a 4.5V to 16V supply range and is classified as obsolete. Due to its obsolete status and limited current inventory availability, equivalent and substitute parts from active manufacturers provide viable alternatives for new designs and production requirements while maintaining functional compatibility within the specified electrical and mechanical parameters.
Substiute Parts
Key Parameters
| Parameter | LM555CM |
|---|---|
| Manufacturer | onsemi |
| Part Number | LM555CM |
| Product Status | Obsolete |
| Type | 555 Type, Timer/Oscillator (Single) |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| Voltage - Supply | 4.5V ~ 16V |
| Current - Supply | 7.5 mA |
| Operating Temperature | 0°C ~ 70°C |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| RoHS Status | Not specified |
Substitute Part Grouping Explanation
Substitution of the LM555CM is determined by the following critical parameters:
- Package Compatibility: All substitute parts must use 8-SOIC (0.154", 3.90mm Width) surface mount packaging to ensure PCB layout compatibility
- Voltage Supply Range: All substitutes must support the 4.5V to 16V operating range
- Functional Type: All substitutes must be 555-type timer/oscillator ICs with single timer configuration
- Current Supply: Substitute parts may exceed the 7.5 mA specification; higher current ratings remain compatible
- Operating Temperature: Substitutes with extended temperature ranges (-40°C to 85°C or -40°C to 105°C) are compatible with applications requiring 0°C to 70°C operation
- Compliance: RoHS3 compliance and REACH unaffected status ensure regulatory alignment
Substitutes are grouped by product status (Active vs. Obsolete) and manufacturer to facilitate procurement decisions.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Voltage - Supply | Current - Supply | Operating Temperature | Package / Case | RoHS Status |
|---|---|---|---|---|---|---|---|
| LM555CM | onsemi | Obsolete | 4.5V ~ 16V | 7.5 mA | 0°C ~ 70°C | 8-SOIC (0.154", 3.90mm Width) | Not specified |
| MC1455DR2G | onsemi | Active | 4.5V ~ 16V | 10 mA | 0°C ~ 70°C | 8-SOIC (0.154", 3.90mm Width) | ROHS3 Compliant |
| MC1455BDR2G | onsemi | Active | 4.5V ~ 16V | 10 mA | -40°C ~ 85°C | 8-SOIC (0.154", 3.90mm Width) | ROHS3 Compliant |
| NE555D | STMicroelectronics | Obsolete | 4.5V ~ 16V | 10 mA | 0°C ~ 70°C | 8-SOIC (0.154", 3.90mm Width) | ROHS3 Compliant |
| NE555S-13 | Diodes Incorporated | Active | 4.5V ~ 16V | 13 mA | 0°C ~ 70°C | 8-SOIC (0.154", 3.90mm Width) | ROHS3 Compliant |
| NA555D | Texas Instruments | Last Time Buy | 4.5V ~ 16V | 10 mA | -40°C ~ 105°C | 8-SOIC (0.154", 3.90mm Width) | ROHS3 Compliant |
| NA555DR | Texas Instruments | Active | 4.5V ~ 16V | 10 mA | -40°C ~ 105°C | 8-SOIC (0.154", 3.90mm Width) | ROHS3 Compliant |
| NA555S-13 | Diodes Incorporated | Active | 4.5V ~ 16V | 13 mA | -40°C ~ 105°C | 8-SOIC (0.154", 3.90mm Width) | ROHS3 Compliant |
| SA555D | Fairchild Semiconductor | Obsolete | 4.5V ~ 16V | 10 mA | -40°C ~ 105°C | 8-SOIC (0.154", 3.90mm Width) | ROHS3 Compliant |
| SA555DR | Texas Instruments | Active | 4.5V ~ 16V | 10 mA | -40°C ~ 85°C | 8-SOIC (0.154", 3.90mm Width) | ROHS3 Compliant |
| SA555DRG4 | Texas Instruments | Obsolete | 4.5V ~ 16V | 10 mA | -40°C ~ 85°C | 8-SOIC (0.154", 3.90mm Width) | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Recommendation for Active Production:
NA555DR (Texas Instruments) is the preferred substitute. It maintains active product status, provides extended operating temperature range (-40°C to 105°C), achieves ROHS3 compliance, and offers the highest inventory availability (43,850 pcs). This part directly replaces LM555CM in new designs while ensuring long-term supply continuity.
Alternative Active Options:
MC1455DR2G (onsemi) provides an active alternative from the original manufacturer with equivalent electrical specifications and ROHS3 compliance. MC1455BDR2G extends the operating temperature range to -40°C to 85°C for applications requiring enhanced thermal performance.
NE555S-13 and NA555S-13 (Diodes Incorporated) accommodate higher current supply requirements (13 mA) while maintaining full compatibility. NA555S-13 offers extended temperature range (-40°C to 105°C) for demanding environments.
SA555DR (Texas Instruments) provides an active alternative with -40°C to 85°C operating range and established supply availability (125,100 pcs).
Obsolete Parts (Not Recommended for New Designs):
NE555D, SA555D, and SA555DRG4 retain obsolete status and should not be selected for new production. These parts are suitable only for legacy system maintenance where original part specifications are mandatory.
Frequently Asked Questions (FAQ)
Q: Can I use NA555DR as a direct replacement for LM555CM?
A: Yes. Both parts share identical package (8-SOIC), voltage supply range (4.5V to 16V), and functional type (555-type timer/oscillator). NA555DR operates across -40°C to 105°C, which encompasses the LM555CM's 0°C to 70°C range. Current supply (10 mA) exceeds LM555CM's 7.5 mA specification, ensuring compatibility in all applications.
Q: What is the difference between MC1455DR2G and MC1455BDR2G?
A: Both are onsemi 555-type timer ICs in 8-SOIC packaging with identical electrical specifications (4.5V to 16V, 10 mA). The primary difference is operating temperature range: MC1455DR2G operates 0°C to 70°C, while MC1455BDR2G extends to -40°C to 85°C. Select MC1455BDR2G for applications requiring enhanced thermal performance.
Q: Why do some substitutes have higher current supply ratings?
A: Current supply specifications indicate maximum device consumption under operating conditions. Parts with higher ratings (10 mA or 13 mA versus 7.5 mA) remain fully compatible; they simply consume more power. Applications designed for 7.5 mA operation will function correctly with higher-rated substitutes, though power budget calculations must be updated accordingly.
Q: Are all substitute parts RoHS3 compliant?
A: All active and most obsolete substitute parts listed are ROHS3 compliant. LM555CM's RoHS status is not specified in available documentation. For applications requiring RoHS3 certification, select from the compliant substitutes: MC1455DR2G, MC1455BDR2G, NE555D, NE555S-13, NA555D, NA555DR, NA555S-13, SA555D, SA555DR, or SA555DRG4.
Q: Can I use parts with extended temperature ranges in standard applications?
A: Yes. Parts rated for -40°C to 105°C or -40°C to 85°C operate correctly within the LM555CM's 0°C to 70°C range. Extended temperature ratings provide additional design margin and are suitable for all applications requiring standard temperature operation.
Q: What packaging options are available for 555-type timer substitutes?
A: All listed substitutes use 8-SOIC (0.154", 3.90mm Width) surface mount packaging, ensuring direct PCB compatibility with LM555CM. Packaging variants (Cut Tape, Digi-Reel, Tube, Tape & Reel) affect procurement and handling but do not alter electrical or mechanical compatibility.
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