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KA555DTF Equivalent & Substitute Parts
Part Overview
The KA555DTF is a 555 Type Timer/Oscillator (Single) 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 KA555DTF 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.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | KA555DTF |
| Manufacturer | onsemi |
| Category | Clock/Timing |
| 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 |
| Product Status | Obsolete |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| REACH Status | REACH Unaffected |
Substitute Part Grouping Explanation
Substitution for the KA555DTF is determined by the following critical parameters:
- Functional Type: 555 Type, Timer/Oscillator (Single) IC
- Package Compatibility: 8-SOIC (0.154", 3.90mm Width) or equivalent 8-SO packaging
- Mounting Type: Surface Mount
- Voltage Supply Range: 4.5V ~ 16V (minimum requirement)
- Current Supply: Maximum 10 mA or lower (KA555DTF: 7.5 mA)
- Operating Temperature Range: Minimum 0°C to 70°C coverage required
- Moisture Sensitivity: MSL 1 (Unlimited)
Substitute parts are grouped into three categories based on their relationship to the main part:
Similar Parts (MC1455BDR2G, MC1455DR2G): Active onsemi alternatives with identical package and voltage specifications. MC1455DR2G matches the operating temperature range of the KA555DTF (0°C ~ 70°C).
Direct Equivalents (NE555DR, NE555S-13): Active parts from alternative manufacturers (UMW, Diodes Incorporated) with full functional compatibility and identical packaging.
Upgrade Options (NA555D, NA555DR, NA555S-13, SA555D, SA555DR, SA555DRG4): Parts with extended operating temperature ranges (-40°C to 85°C or higher) and active product status, suitable for designs requiring broader temperature performance or long-term availability.
Parameter Comparison
| Part Number | Manufacturer | Type | Package | Voltage Supply | Current Supply | Operating Temp | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|
| KA555DTF | onsemi | 555 Type Timer/Oscillator (Single) | 8-SOIC | 4.5V ~ 16V | 7.5 mA | 0°C ~ 70°C | Obsolete | Not specified |
| MC1455BDR2G | onsemi | 555 Type Timer/Oscillator (Single) | 8-SOIC | 4.5V ~ 16V | 10 mA | -40°C ~ 85°C | Active | ROHS3 Compliant |
| MC1455DR2G | onsemi | 555 Type Timer/Oscillator (Single) | 8-SOIC | 4.5V ~ 16V | 10 mA | 0°C ~ 70°C | Active | ROHS3 Compliant |
| NE555DR | UMW | 555 Type Timer/Oscillator (Single) | 8-SOIC | 4.5V ~ 16V | 10 mA | 0°C ~ 70°C | Active | ROHS3 Compliant |
| NE555S-13 | Diodes Incorporated | 555 Type Timer/Oscillator (Single) | 8-SOIC | 4.5V ~ 16V | 13 mA | 0°C ~ 70°C | Active | ROHS3 Compliant |
| NA555D | Texas Instruments | 555 Type Timer/Oscillator (Single) | 8-SOIC | 4.5V ~ 16V | 10 mA | -40°C ~ 105°C | Last Time Buy | ROHS3 Compliant |
| NA555DR | Texas Instruments | 555 Type Timer/Oscillator (Single) | 8-SOIC | 4.5V ~ 16V | 10 mA | -40°C ~ 105°C | Active | ROHS3 Compliant |
| NA555S-13 | Diodes Incorporated | 555 Type Timer/Oscillator (Single) | 8-SOIC | 4.5V ~ 16V | 13 mA | -40°C ~ 105°C | Active | ROHS3 Compliant |
| SA555D | Fairchild Semiconductor | 555 Type Timer/Oscillator (Single) | 8-SOIC | 4.5V ~ 16V | 10 mA | -40°C ~ 105°C | Obsolete | ROHS3 Compliant |
| SA555DR | Texas Instruments | 555 Type Timer/Oscillator (Single) | 8-SOIC | 4.5V ~ 16V | 10 mA | -40°C ~ 85°C | Active | ROHS3 Compliant |
| SA555DRG4 | Texas Instruments | 555 Type Timer/Oscillator (Single) | 8-SOIC | 4.5V ~ 16V | 10 mA | -40°C ~ 85°C | Obsolete | ROHS3 Compliant |
Engineering Selection Recommendations
For Direct Replacement (Matching Operating Temperature 0°C ~ 70°C):
MC1455DR2G is the primary recommendation as an active onsemi part with identical operating temperature range to the KA555DTF. NE555DR from UMW provides an alternative with active product status and equivalent specifications. Both parts maintain the 8-SOIC package and 4.5V ~ 16V supply voltage compatibility.
For Extended Temperature Applications (-40°C ~ 85°C or -40°C ~ 105°C):
NA555DR (Texas Instruments, Active) and SA555DR (Texas Instruments, Active) offer extended operating temperature ranges with ROHS3 compliance. NA555S-13 (Diodes Incorporated, Active) extends to -40°C ~ 105°C with 500kHz frequency specification. These parts are suitable for designs requiring broader environmental performance.
Compliance Considerations:
All substitute parts listed carry ROHS3 compliance and REACH Unaffected status, matching the regulatory requirements of the KA555DTF. All parts maintain MSL 1 (Unlimited) moisture sensitivity classification. Parts with Active product status (MC1455DR2G, NE555DR, NA555DR, NA555S-13, SA555DR) are preferred for new designs and long-term production continuity.
Inventory and Availability:
MC1455DR2G (25,300 pcs), NA555DR (43,850 pcs), and SA555DR (125,100 pcs) offer substantial inventory availability for production requirements.
Frequently Asked Questions (FAQ)
Q: Can MC1455DR2G directly replace KA555DTF in existing designs?
A: Yes. MC1455DR2G matches the KA555DTF operating temperature range (0°C ~ 70°C), supply voltage (4.5V ~ 16V), package (8-SOIC), and functional type (555 Type Timer/Oscillator Single). The part is pin-compatible and functionally equivalent.
Q: What is the difference between MC1455DR2G and MC1455BDR2G?
A: Both are onsemi MC1455 variants in 8-SOIC packaging with identical supply voltage and current specifications. MC1455BDR2G operates across -40°C ~ 85°C, while MC1455DR2G operates across 0°C ~ 70°C. Select based on your application's temperature requirements.
Q: Why do some substitute parts have higher current supply ratings (10 mA or 13 mA) than the KA555DTF (7.5 mA)?
A: Higher current ratings indicate maximum supply current under specified conditions. Parts with 10 mA or 13 mA ratings remain compatible with the KA555DTF as long as your circuit design accommodates the maximum current draw. The actual operating current depends on circuit configuration and load conditions.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All substitute parts listed carry ROHS3 compliance certification, matching the regulatory status required for modern electronics manufacturing.
Q: Which substitute part offers the broadest operating temperature range?
A: NA555DR and NA555S-13 both operate across -40°C ~ 105°C, providing the widest temperature coverage. NA555DR is recommended for general applications, while NA555S-13 is specified for 500kHz frequency operation.
Q: Is the 8-SOIC package identical across all substitute parts?
A: Yes. All substitute parts use 8-SOIC (0.154", 3.90mm Width) or equivalent 8-SO packaging, ensuring mechanical and electrical compatibility with the KA555DTF footprint.
Q: What is the product status significance for component selection?
A: Active status parts (MC1455DR2G, NE555DR, NA555DR, NA555S-13, SA555DR) are in current production and recommended for new designs and long-term production runs. Last Time Buy status (NA555D) indicates limited future availability. Obsolete status (KA555DTF, SA555D, SA555DRG4) indicates discontinued production.
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