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UC2843ADM Equivalent & Substitute Parts
Part Overview
The UC2843ADM is a power management integrated circuit manufactured by Microchip Technology, operating as a boost, buck, flyback, and forward regulator positive isolation-capable output step-up/step-down DC-DC controller. This device is currently in active product status with 2,803 units in stock. Alternative models become necessary when specific supply chain constraints, packaging requirements, or performance grade specifications demand evaluation of functionally compatible controllers within the same topology class.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Microchip Technology |
| Part Number | UC2843ADM |
| Category | Power Management (PMIC) |
| Package Type | 8-SOIC (0.154", 3.90mm Width) |
| Topology | Boost, Buck, Flyback, Forward |
| Output Configuration | Positive, Isolation Capable |
| Voltage Supply Range (Vcc/Vdd) | 7.6V ~ 30V |
| Maximum Switching Frequency | Up to 500kHz |
| Maximum Duty Cycle | 96% |
| Operating Temperature Range | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
| Product Status | Active |
Substitute Part Grouping Explanation
Substitution of UC2843ADM alternatives is determined by strict alignment with the following electrical and mechanical parameters: identical 8-SOIC package configuration, compatible supply voltage range (minimum 7.6V operation required), matching operating temperature range (-40°C ~ 85°C), and functional equivalence across boost, buck, flyback, and forward topologies. All substitute candidates must demonstrate RoHS3 compliance and identical moisture sensitivity classification (MSL 1). The substitution logic accounts for both direct manufacturer equivalents from Texas Instruments (UC2842 and UC2843 base series with AD8/D8 suffix configurations) and upgraded temperature-rated variants (UC1842AMDREP) that exceed baseline performance specifications while maintaining electrical compatibility.
Parameter Comparison
| Part Number | Manufacturer | Voltage Supply (Vcc/Vdd) | Operating Temperature | Package / Case | Product Status | RoHS Status | Inventory |
|---|---|---|---|---|---|---|---|
| UC2843ADM | Microchip Technology | 7.6V ~ 30V | -40°C ~ 85°C | 8-SOIC (0.154", 3.90mm) | Active | ROHS3 Compliant | 2,803 Pcs |
| UC2842AD8 | Texas Instruments | 10V ~ 30V | -40°C ~ 85°C | 8-SOIC (0.154", 3.90mm) | Last Time Buy | ROHS3 Compliant | 1,136 Pcs |
| UC2842AD8G4 | Texas Instruments | 10V ~ 30V | -40°C ~ 85°C | 8-SOIC (0.154", 3.90mm) | Last Time Buy | ROHS3 Compliant | 1,522 Pcs |
| UC2842AD8TR | Texas Instruments | 10V ~ 30V | -40°C ~ 85°C | 8-SOIC (0.154", 3.90mm) | Active | ROHS3 Compliant | 39,300 Pcs |
| UC2842D8 | Texas Instruments | 12V ~ 28V | -40°C ~ 85°C | 8-SOIC (0.154", 3.90mm) | Active | ROHS3 Compliant | 1,258 Pcs |
| UC2842D8TR | Texas Instruments | 12V ~ 28V | -40°C ~ 85°C | 8-SOIC (0.154", 3.90mm) | Active | ROHS3 Compliant | 3,713 Pcs |
| UC2843AD8 | Texas Instruments | 7.6V ~ 30V | -40°C ~ 85°C | 8-SOIC (0.154", 3.90mm) | Active | ROHS3 Compliant | 3,358 Pcs |
| UC2843AD8TR | Texas Instruments | 7.6V ~ 30V | -40°C ~ 85°C | 8-SOIC (0.154", 3.90mm) | Active | ROHS3 Compliant | 71,866 Pcs |
| UC2843D8 | Texas Instruments | 12V ~ 28V | -40°C ~ 85°C | 8-SOIC (0.154", 3.90mm) | Last Time Buy | ROHS3 Compliant | 4,234 Pcs |
| UC2843D8TR | Texas Instruments | 12V ~ 28V | -40°C ~ 85°C | 8-SOIC (0.154", 3.90mm) | Active | ROHS3 Compliant | 36,291 Pcs |
| UC1842AMDREP | Texas Instruments | 10V ~ 30V | -55°C ~ 125°C | 8-SOIC (0.154", 3.90mm) | Active | ROHS3 Compliant | 2,744 Pcs |
Engineering Selection Recommendations
Direct Functional Equivalents (UC2843 Series - Texas Instruments): The UC2843AD8 and UC2843AD8TR variants represent the closest electrical equivalents, maintaining identical supply voltage range (7.6V ~ 30V) and topology compatibility with the UC2843ADM. Both devices carry Active product status with significantly higher inventory availability (3,358 and 71,866 units respectively). The UC2843AD8TR configuration provides tape-and-reel packaging suitable for automated assembly. UC2843D8 and UC2843D8TR variants operate within a restricted supply voltage window (12V ~ 28V) and are designated Last Time Buy or Active status; these are suitable only when the 7.6V lower bound is not required.
Alternative Base Series (UC2842 - Texas Instruments): UC2842AD8 variants deliver compatible switching controller functionality with supply voltage floor of 10V. Device status ranges from Last Time Buy to Active. These controllers provide functional equivalence for applications exceeding 10V minimum supply, with substantial inventory depth available in AD8TR format (39,300 units).
Extended Temperature Grade (UC1842AMDREP - Texas Instruments): This variant qualifies as an upgrade option, extending operating temperature range to -55°C ~ 125°C while maintaining 10V ~ 30V supply compatibility. Applicable for applications demanding wide-temperature performance beyond the standard -40°C ~ 85°C specification. Product status is Active with 2,744 units in stock.
Product Status Considerations: Devices marked Last Time Buy (UC2842AD8, UC2842AD8G4, UC2843D8) indicate manufacturer discontinuation with limited future availability. Active status devices are recommended for new designs and production planning.
Frequently Asked Questions (FAQ)
Q: Can UC2842 variants directly replace UC2843ADM? A: UC2842 devices provide functionally equivalent PWM controller operation across boost, buck, and flyback topologies. The primary distinction is the minimum supply voltage threshold: UC2842 requires 10V minimum operation, while UC2843ADM operates down to 7.6V. Substitution is valid only when the application supply voltage remains above 10V throughout operation.
Q: What are the packaging differences among substitute options? A: All substitutes use identical 8-SOIC surface-mount packages (0.154", 3.90mm width). Packaging suffix variants indicate distribution method: Tube packaging, Cut Tape & Digi-Reel (TR), and Tape & Reel (TR). These differences affect component handling and assembly integration but do not alter electrical performance.
Q: Is UC1842AMDREP suitable as a direct replacement? A: UC1842AMDREP functions as an electrical equivalent with enhanced temperature specification (-55°C ~ 125°C versus -40°C ~ 85°C). Supply voltage range is 10V ~ 30V. This device is suitable for replacement when extended temperature operation is required or beneficial. Applications operating within standard temperature bounds do not require this upgrade.
Q: Which substitute offers the best inventory availability? A: UC2843AD8TR provides maximum inventory depth at 71,866 units, with Active product status and identical electrical parameters to UC2843ADM. This configuration is optimal for supply chain continuity planning.
Q: Are all substitutes RoHS3 compliant? A: All listed substitutes carry ROHS3 compliance certification with MSL 1 moisture sensitivity rating, matching the UC2843ADM environmental qualification.
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