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UC2845ADM Equivalent & Substitute Parts
Part Overview
The UC2845ADM is a Power Management Integrated Circuit (PMIC) manufactured by Microchip Technology, designed as a boost, buck, flyback, and forward regulator controller with positive and isolation-capable output configuration. This device functions as a step-up/step-down DC-DC controller in 8-SOIC surface mount packaging. The UC2845ADM is currently listed as obsolete, which necessitates identification of active substitute parts with compatible electrical and mechanical characteristics for design continuity and procurement flexibility.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | UC2845ADM |
| Manufacturer | Microchip Technology |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Voltage - Supply (Vcc/Vdd) | 7.6V ~ 30V |
| Frequency - Switching | Up to 500kHz |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Duty Cycle (Max) | 48% |
| Topology | Boost, Buck, Flyback, Forward |
| Output Configuration | Positive, Isolation Capable |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution of the UC2845ADM is determined by alignment of the following critical parameters:
Package Compatibility: All substitute parts must use 8-SOIC (0.154", 3.90mm Width) surface mount packaging to ensure drop-in compatibility with existing printed circuit board layouts.
Voltage Supply Range: Substitute parts must operate within the supply voltage range of 7.6V ~ 30V. Parts with supply ranges that fully encompass or overlap this specification are considered compatible. UC2845AD8 and UC2845AD8TR meet this requirement exactly (7.6V ~ 30V). ISL8841 variants, ISL8844 variants, and ISL8845 variants specify higher minimum supply voltages (8.8V ~ 9V), which restricts operation in designs requiring 7.6V ~ 8.7V operation.
Topology Support: The UC2845ADM supports boost, buck, flyback, and forward topologies. Substitute parts must support at least the topologies required by the target application. UC2845AD8 and UC2845AD8TR support multiple topologies as PWM controllers. ISL8841 series supports boost and flyback. ISL8844 series supports boost and flyback. ISL8845 series supports boost and flyback.
Switching Frequency: The UC2845ADM operates at up to 500kHz. Substitute parts with higher frequency ratings (ISL series at up to 2MHz) are compatible for 500kHz operation and below. Texas Instruments UC2845AD8 series maintains the same frequency capability.
Output Configuration: The UC2845ADM provides positive and isolation-capable output. All listed substitutes maintain transistor driver output type with positive configuration suitable for isolated topologies.
Product Status and Compliance: Due to the obsolete status of UC2845ADM, active product status substitutes are prioritized. All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, matching the original part's regulatory requirements.
Parameter Comparison
| Parameter | UC2845ADM (Main) | UC2845AD8 | UC2845AD8TR | ISL8841AMBZ | ISL8841AMBZ-T | ISL8844AABZ | ISL8844AABZ-T | ISL8844AMBZ | ISL8844AMBZ-T | ISL8845AABZ | ISL8845AABZ-T |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Microchip | Texas Instruments | Texas Instruments | Renesas | Renesas | Renesas | Renesas | Renesas | Renesas | Intersil | Renesas |
| Package / Case | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Voltage - Supply (Vcc/Vdd) | 7.6V ~ 30V | 7.6V ~ 30V | 7.6V ~ 30V | 9V ~ 30V | 9V ~ 30V | 8.8V ~ 30V | 8.8V ~ 30V | 8.8V ~ 30V | 8.8V ~ 30V | 9V ~ 30V | 9V ~ 30V |
| Frequency - Switching | Up to 500kHz | Not specified | Not specified | Up to 2MHz | Up to 2MHz | Up to 2MHz | Up to 2MHz | Up to 2MHz | Up to 2MHz | Up to 2MHz | Up to 2MHz |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -55°C ~ 125°C | -55°C ~ 125°C | -40°C ~ 105°C | -40°C ~ 105°C | -55°C ~ 125°C | -55°C ~ 125°C | -40°C ~ 105°C | -40°C ~ 105°C |
| Duty Cycle (Max) | 48% | Not specified | Not specified | 48% | 48% | 48% | 48% | 48% | 48% | 48% | 48% |
| Topology | Boost, Buck, Flyback, Forward | Multiple | Multiple | Boost, Flyback | Boost, Flyback | Boost, Flyback | Boost, Flyback | Boost, Flyback | Boost, Flyback | Boost, Flyback | Boost, Flyback |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | Not specified | ROHS3 Compliant |
| Product Status | Obsolete | Last Time Buy | Active | Active | Active | Active | Active | Active | Active | Active | Active |
Engineering Selection Recommendations
Direct Functional Replacement: UC2845AD8TR (Texas Instruments) provides the most direct equivalent to the UC2845ADM. This part maintains identical supply voltage range (7.6V ~ 30V), same operating temperature specification (-40°C ~ 85°C), matching 8-SOIC packaging, and active product status. UC2845AD8TR is available in cut tape and digi-reel packaging with 25,300 units in stock. UC2845AD8 (tube packaging) offers identical electrical characteristics with last-time-buy status.
Extended Temperature Range Alternatives: ISL8844AMBZ and ISL8844AMBZ-T (Renesas) extend operating temperature to -55°C ~ 125°C, with boost and flyback topology support. These parts accept supply voltages from 8.8V ~ 30V, requiring verification that designs do not require operation below 8.8V. ISL8841AMBZ and ISL8841AMBZ-T provide -55°C ~ 125°C operation with 9V ~ 30V supply range and active product status.
Higher Frequency Capability: All ISL series substitutes (ISL8841, ISL8844, ISL8845) support switching frequencies up to 2MHz, exceeding the UC2845ADM specification of 500kHz. These parts are suitable for designs operating at or below 500kHz with sufficient design margin.
Topology Restrictions: Designs utilizing buck or forward topologies exclusively supported by the UC2845ADM must use UC2845AD8 or UC2845AD8TR. ISL8841, ISL8844, and ISL8845 families support boost and flyback topologies only. Applications requiring buck or forward operation must select Texas Instruments UC2845 variants.
Regulatory Compliance: All listed substitutes maintain ROHS3 compliance and REACH unaffected status, matching original part certification requirements. ISL8845AABZ (Intersil) does not specify RoHS status and requires compliance verification prior to selection.
Frequently Asked Questions (FAQ)
Q: Can ISL series parts directly replace UC2845ADM in existing designs? A: ISL series parts are compatible only for boost and flyback topologies. Designs utilizing buck or forward converter topologies require UC2845AD8 or UC2845AD8TR. Supply voltage requirements must be verified: ISL8841 and ISL8845 require minimum 9V; ISL8844 requires minimum 8.8V. UC2845 variants operate from 7.6V.
Q: What is the difference between UC2845AD8 (tube) and UC2845AD8TR (tape & reel)? A: Both parts have identical electrical characteristics and 8-SOIC packaging. UC2845AD8TR is available in cut tape and digi-reel packaging (25,300 units in stock) with active product status. UC2845AD8 uses tube packaging (2,045 units in stock) with last-time-buy status. Selection depends on assembly equipment compatibility and procurement timeline requirements.
Q: Are Renesas ISL8844 and ISL8841 parts functionally equivalent? A: Both families support boost and flyback topologies with 48% maximum duty cycle and 8-SOIC packaging. ISL8844 variants support supply voltages from 8.8V ~ 30V with current limiting and frequency control features. ISL8841 variants operate from 9V ~ 30V. Operating temperature ranges vary by part variant. Electrical compatibility depends on specific circuit design requirements and supply voltage constraints.
Q: Which substitute has the best long-term availability? A: UC2845AD8TR (Texas Instruments) has active product status with 25,300 units in stock. ISL series parts (Renesas/Intersil) also maintain active status with inventory ranging from 966 to 25,400 units. UC2845AD8 has last-time-buy status with limited inventory. For new designs, UC2845AD8TR or ISL series active parts are preferred for supply continuity.
Q: Can I use an ISL8845 substitute if my design operates at 7.8V supply voltage? A: No. ISL8845 requires minimum 9V supply voltage. Designs requiring operation below 9V must use UC2845AD8 or UC2845AD8TR, which accept 7.6V ~ 30V supply range. ISL8844 supports 8.8V minimum, which also restricts 7.8V operation.
Q: What packaging options are available for UC2845 direct substitutes? A: UC2845AD8 is available in tube packaging. UC2845AD8TR is available in cut tape and digi-reel (TR) packaging. Both use 8-SOIC (0.154", 3.90mm Width) surface mount package. Package selection must match printed circuit board assembly equipment specifications and reel/tape handling requirements.
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