Request Quote
(Ships tomorrow)
LM555CMX Equivalent & Substitute Parts
Part Overview
The LM555CMX is a 555-type single timer/oscillator IC manufactured by onsemi in 8-SOIC surface mount packaging. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The LM555CMX operates across a supply voltage range of 4.5V to 16V with a maximum supply current of 7.5 mA and an operating temperature range of 0°C to 70°C. Identifying compatible alternatives ensures design flexibility and supply chain resilience.
Substiute Parts
Key Parameters
| Parameter | LM555CMX |
|---|---|
| Manufacturer | onsemi |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| Type | 555 Type, Timer/Oscillator (Single) |
| Voltage - Supply | 4.5V ~ 16V |
| Current - Supply | 7.5 mA |
| Operating Temperature | 0°C ~ 70°C |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution of the LM555CMX is determined by strict adherence to the following electrical and mechanical parameters:
Critical Compatibility Parameters:
- Package type: 8-SOIC (0.154", 3.90mm Width) or equivalent 8-pin SOIC/SOP footprint
- Mounting type: Surface Mount
- Device type: 555-type single timer/oscillator
- Supply voltage range: Minimum 4.5V to 16V (must encompass or exceed the original range)
- Operating temperature: Must support at least 0°C to 70°C
- Moisture sensitivity: MSL 1 (Unlimited) preferred for compatibility
Substitute parts are grouped into three categories based on their relationship to the original specification:
Direct Manufacturer Substitutes: Parts from alternative manufacturers that maintain identical electrical specifications and package footprint.
Similar Manufacturer Substitutes: Parts with extended operating temperature ranges or slightly different supply current ratings but maintaining core 555-type functionality and package compatibility.
Upgrade Substitutes: Parts with enhanced specifications (extended temperature range, higher frequency capability, or active product status) that provide superior performance characteristics while maintaining backward compatibility.
Parameter Comparison
| Part Number | Manufacturer | Package | Voltage - Supply | Current - Supply | Operating Temperature | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|
| LM555CMX | onsemi | 8-SOIC | 4.5V ~ 16V | 7.5 mA | 0°C ~ 70°C | Obsolete | REACH Unaffected |
| MC1455DR2G | onsemi | 8-SOIC | 4.5V ~ 16V | 10 mA | 0°C ~ 70°C | Active | ROHS3 Compliant |
| MC1455BDR2G | onsemi | 8-SOIC | 4.5V ~ 16V | 10 mA | -40°C ~ 85°C | Active | ROHS3 Compliant |
| NE555DR | UMW | 8-SOIC | 4.5V ~ 16V | 10 mA | 0°C ~ 70°C | Active | ROHS3 Compliant |
| NE555S-13 | Diodes Incorporated | 8-SOIC | 4.5V ~ 16V | 13 mA | 0°C ~ 70°C | Active | ROHS3 Compliant |
| NA555D | Texas Instruments | 8-SOIC | 4.5V ~ 16V | 10 mA | -40°C ~ 105°C | Last Time Buy | ROHS3 Compliant |
| NA555DR | Texas Instruments | 8-SOIC | 4.5V ~ 16V | 10 mA | -40°C ~ 105°C | Active | ROHS3 Compliant |
| NA555S-13 | Diodes Incorporated | 8-SOIC | 4.5V ~ 16V | 13 mA | -40°C ~ 105°C | Active | ROHS3 Compliant |
| SA555D | Fairchild Semiconductor | 8-SOIC | 4.5V ~ 16V | 10 mA | -40°C ~ 105°C | Obsolete | ROHS3 Compliant |
| SA555DR | Texas Instruments | 8-SOIC | 4.5V ~ 16V | 10 mA | -40°C ~ 85°C | Active | ROHS3 Compliant |
| SA555DRG4 | Texas Instruments | 8-SOIC | 4.5V ~ 16V | 10 mA | -40°C ~ 85°C | Obsolete | ROHS3 Compliant |
Engineering Selection Recommendations
For Direct Replacement (Identical Operating Conditions):
MC1455DR2G and NE555DR are the primary direct substitutes. Both maintain the 0°C to 70°C operating temperature range and 4.5V to 16V supply voltage specification. MC1455DR2G is manufactured by onsemi, the original manufacturer, ensuring design continuity. NE555DR from UMW provides an alternative source with active product status and ROHS3 compliance.
For Extended Temperature Applications:
MC1455BDR2G, NA555DR, NA555S-13, and SA555DR extend the operating temperature range to -40°C to 85°C or -40°C to 105°C. These parts are suitable for applications requiring wider temperature performance while maintaining electrical compatibility. NA555DR and SA555DR are both active products from Texas Instruments with ROHS3 compliance.
For Supply Chain Continuity:
All substitute parts listed maintain active or last-time-buy product status except SA555D and SA555DRG4, which are obsolete. Active products (MC1455DR2G, MC1455BDR2G, NE555DR, NE555S-13, NA555DR, NA555S-13, SA555DR) provide long-term availability and supply security.
Compliance Considerations:
All substitute parts are ROHS3 compliant and REACH unaffected, meeting modern environmental and regulatory requirements. The LM555CMX is REACH unaffected, and all substitutes maintain this status.
Frequently Asked Questions (FAQ)
Q: Can MC1455DR2G directly replace LM555CMX in existing designs?
A: Yes. MC1455DR2G maintains identical package footprint (8-SOIC), supply voltage range (4.5V to 16V), and operating temperature range (0°C to 70°C). The 2.5 mA increase in supply current (from 7.5 mA to 10 mA) is within typical design margins for timer applications and does not affect functional compatibility.
Q: What is the difference between MC1455DR2G and MC1455BDR2G?
A: Both are onsemi MC1455 variants in 8-SOIC packaging. MC1455BDR2G extends the operating temperature range to -40°C to 85°C, making it suitable for industrial and automotive applications. MC1455DR2G maintains the 0°C to 70°C range. Select MC1455BDR2G if your application requires extended temperature performance.
Q: Why do some substitutes have higher supply current ratings?
A: Supply current variations (7.5 mA to 13 mA) reflect manufacturing process differences across vendors while maintaining 555-type functional equivalence. Higher current ratings do not affect circuit operation but require verification that power supply capacity is adequate for the selected part.
Q: Are NE555S-13 and NA555S-13 interchangeable?
A: Both are 555-type timers in 8-SOIC packaging with identical supply voltage (4.5V to 16V) and current (13 mA) specifications. NE555S-13 operates at 0°C to 70°C (Diodes Incorporated), while NA555S-13 extends to -40°C to 105°C (also Diodes Incorporated). Select based on required temperature range.
Q: What is the significance of product status (Active vs. Obsolete)?
A: Active products have ongoing manufacturing and supply availability. Last-time-buy products have limited remaining inventory. Obsolete products have ceased production. For new designs, select active products (MC1455DR2G, NE555DR, NA555DR, SA555DR) to ensure long-term supply security.
Q: Is the 8-SOIC package compatible with 8-SOP footprints?
A: 8-SOIC and 8-SOP are functionally equivalent small-outline packages with identical pin spacing and footprint dimensions (0.154" width, 3.90mm). Parts specified as either 8-SOIC or 8-SOP are mechanically and electrically interchangeable in PCB designs.
Q: Do all substitutes meet RoHS compliance?
A: All listed substitutes are ROHS3 compliant. The original LM555CMX is REACH unaffected. All substitutes maintain REACH unaffected status, ensuring compliance with current environmental regulations.
Alternative Parts
SJ6012L2TP
Littelfuse Inc.
6 Alternative Parts
JMK107BBJ476MA-RE
Taiyo Yuden
10 Alternative Parts
GMK107BBJ475MA-T
Taiyo Yuden
5 Alternative Parts
SJ6020N2ARP
Littelfuse Inc.
3 Alternative Parts
SJ6025R2ATP
Littelfuse Inc.
4 Alternative Parts
2474-05L
API Delevan Inc.
1 Alternative Parts
4590R-684K
API Delevan Inc.
1 Alternative Parts
CM6560R-334
API Delevan Inc.
1 Alternative Parts
CM6460-104
API Delevan Inc.
1 Alternative Parts
5526-12
API Delevan Inc.
1 Alternative Parts