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AP3440FNTR-G1 Equivalent & Substitute Parts
Part Overview
The AP3440FNTR-G1 is a buck switching regulator IC manufactured by Diodes Incorporated, designed for positive adjustable output applications. This device delivers 4A output current with an adjustable output voltage starting from 0.803V, operating across an input voltage range of 2.95V to 5.5V. The part is classified as Obsolete, necessitating identification of equivalent alternatives for ongoing design support and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Diodes Incorporated |
| Part Number | AP3440FNTR-G1 |
| Category | Power Management (PMIC) |
| Function | Step-Down (Buck) |
| Output Configuration | Positive Adjustable |
| Number of Outputs | 1 |
| Voltage - Input (Min) | 2.95V |
| Voltage - Input (Max) | 5.5V |
| Voltage - Output (Min) | 0.803V |
| Voltage - Output (Max) | 5.5V |
| Current - Output | 4A |
| Frequency - Switching | 200kHz ~ 2MHz |
| Synchronous Rectifier | Yes |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Package / Case | 16-UFQFN Exposed Pad |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| MSL Rating | 3 (168 Hours) |
Substitute Part Grouping Explanation
Substitution eligibility for the AP3440FNTR-G1 is determined by the following critical parameters:
- Topology & Function: Buck (step-down) switching regulator with positive adjustable output
- Output Current Rating: 4A minimum
- Input Voltage Range: Minimum 2.95V to 5.5V maximum
- Output Voltage Adjustability: Adjustable from 0.803V or lower
- Package Compatibility: 16-UFQFN Exposed Pad form factor
- Synchronous Rectification: Integrated synchronous rectifier
- Regulatory Compliance: ROHS3 compliant
The SC186ULTRT from Semtech Corporation meets these substitution criteria across all critical electrical and mechanical parameters, enabling direct functional replacement in applications currently using the AP3440FNTR-G1.
Parameter Comparison
| Parameter | AP3440FNTR-G1 (Main) | SC186ULTRT (Substitute) |
|---|---|---|
| Manufacturer | Diodes Incorporated | Semtech Corporation |
| Function | Step-Down (Buck) | Step-Down (Buck) |
| Output Configuration | Positive Adjustable | Positive Adjustable (Programmable) |
| Number of Outputs | 1 | 1 |
| Voltage - Input (Min) | 2.95V | 2.9V |
| Voltage - Input (Max) | 5.5V | 5.5V |
| Voltage - Output (Min) | 0.803V | 0.8V (0.8V ~ 3.3V) |
| Voltage - Output (Max) | 5.5V | 5.5V |
| Current - Output | 4A | 4A |
| Frequency - Switching | 200kHz ~ 2MHz | 1.5MHz |
| Synchronous Rectifier | Yes | Yes |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 125°C (TJ) |
| Package / Case | 16-UFQFN Exposed Pad | 16-UFQFN Exposed Pad |
| Mounting Type | Surface Mount | Surface Mount |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| MSL Rating | 3 (168 Hours) | 1 (Unlimited) |
| Product Status | Obsolete | Not For New Designs |
Engineering Selection Recommendations
The SC186ULTRT serves as a functional equivalent to the AP3440FNTR-G1 based on matching electrical specifications and package compatibility. Both devices are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements.
The AP3440FNTR-G1 is classified as Obsolete, while the SC186ULTRT is classified as Not For New Designs. For applications currently deployed with the AP3440FNTR-G1, the SC186ULTRT provides continuity of supply and functional compatibility. The SC186ULTRT offers an extended operating temperature range (-40°C to 125°C junction temperature versus -40°C to 85°C ambient for the original part) and superior moisture sensitivity rating (MSL 1 versus MSL 3), providing enhanced reliability characteristics in demanding environments.
Frequently Asked Questions (FAQ)
Q: Can the SC186ULTRT directly replace the AP3440FNTR-G1 in existing designs?
A: Yes. Both devices share identical package geometry (16-UFQFN Exposed Pad), matching output current rating (4A), overlapping input voltage range (2.9V to 5.5V), and equivalent output voltage adjustability. Pin-to-pin compatibility and functional equivalence enable direct substitution.
Q: What are the key differences between these two parts?
A: The SC186ULTRT features programmable output voltage adjustment (0.8V to 3.3V range) compared to the AP3440FNTR-G1's adjustable output (0.803V minimum). The SC186ULTRT operates at a fixed 1.5MHz switching frequency, while the AP3440FNTR-G1 operates across 200kHz to 2MHz. The SC186ULTRT provides extended temperature range (-40°C to 125°C) and superior moisture sensitivity (MSL 1 unlimited versus MSL 3 168 hours).
Q: Are there any compliance or certification differences?
A: Both parts are ROHS3 compliant and REACH unaffected. The SC186ULTRT carries an improved MSL rating (1 versus 3), indicating lower moisture absorption risk during storage and handling.
Q: What is the impact of the fixed 1.5MHz switching frequency on the SC186ULTRT versus the variable frequency range of the AP3440FNTR-G1?
A: The SC186ULTRT operates at a single 1.5MHz switching frequency, which falls within the AP3440FNTR-G1's operating range. This fixed frequency simplifies EMI filtering design and provides consistent performance across load conditions, though it eliminates the frequency adjustment capability of the original part.
Q: Are there packaging or tape & reel considerations for procurement?
A: The SC186ULTRT is supplied in Tape & Reel (TR) packaging format. Verify that your assembly process and storage conditions accommodate the MSL 1 rating, which permits unlimited storage duration under controlled conditions.
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