Overview
Information | 400mA Low Dropout Voltage Regulator (LDOs) |
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Output Option | Fixed |
VOUT (V) | 3.3 |
VOUT Adj MIN (V) | - |
VOUT Adj MAX (V) | - |
IOUT (mA) | 400 |
VIN MIN (V) | 4.1 |
VIN MAX (V) | 30 |
IQ (µA) | 100 |
Accuracy (%) | 0.5%, 1% |
Vdrop (mV) | 420 |
Output Noise (µVRMS) | 260 |
PSRR (dB) | 31 |
Junction Temp Range (°C) | -40 to 125 |
Package | SOT223-3 |
Features | Enable,Power Good,Current limit and thermal protection |
The SPX2945 is a low power voltage regulator. This device is an excellent choice for use in battery powered applications such as cordless telephones, radio control systems and portable computers. The SPX2945 features very low quiescent current (100μA typical) and very low dropout voltage. This includes a tight initial tolerance of 1% max and very low output temperature coefficient, making the SPX2945 useful as a low power voltage reference.
The error flag output feature is used as power-on reset for warning of a low output voltage, due to a falling voltage input of batteries. Another feature is the logic-compatible shutdown input which enables the regulator to be switched on and off. The SPX2945 is offered in 3-pin TO-220 package, SO-8 (same pinout as SPX2951), SOT-223, surface mount 3-pin TO-252, 3-pin TO-263 packages and 5-pin TO-263.
The regulator output voltage (of the 8-pin SO-8) may be pin-strapped for a 3.3V and 5.0V or programmed from 1.24V to 20V with an external pair of resistors. Look for SPX2951 for 150mA and SPX2954 for 250mA applications.
- Output 3.3V, 5.0V at 400mA output
- Very low quiescent current, 100µA
- Low dropout voltage, 420mV at 400mA
- Extremely tight load and line regulation
- Very low temperature coefficient
- Current and thermal limiting
- Error flag warns of output dropout
- Logic controlled electronic shutdown
- Output programmable from 1.24V to 20V (for SO-8)
Documentation & Design Tools
Type | Title | Version | Date | File Size |
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Data Sheets | SPX2945 400mA Low Dropout Voltage Regulator with Shutdown | R00 | May 2023 | 942.4 KB |
Application Notes | AN200, Downloading and Installing CAD Symbols and Footprints with Ultra Librarian | April 2019 | 1.2 MB | |
Product Brochures | Power Management Brochure | May 2024 | 7.1 MB | |
Symbols & Footprints | SPX2945M3-L-3-3/TR CAD File (.bxl) | September 2018 | 65.9 KB |
Quality & RoHS
Part Number | RoHS | Exempt | RoHS | Halogen Free | REACH | TSCA | MSL Rating / Peak Reflow | Package |
---|---|---|---|---|---|---|---|
SPX2945M3-L-3-3/TR | N | Y | Y | Y | Y | L1 / 260ᵒC | SOT-223-3 |
Click on the links above to download the Certificate of Non-Use of Hazardous Substances.
Parts & Purchasing
Part Number | Pkg Code | Min Temp | Max Temp | Status | Suggested Replacement | Buy Now | Order Samples | PDN |
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SPX2945M3-3-3 | SOT-223-3 | -40 | 125 | OBS | SPX2945M3-L-3-3 | |||
SPX2945M3-3-3/TR | SOT-223-3 | -40 | 125 | OBS | M3-L-3-3/TR | |||
SPX2945M3-5-0 | SOT-223-3 | -40 | 125 | OBS | SPX2945M3-L-5-0 | |||
SPX2945M3-5-0/TR | SOT-223-3 | -40 | 125 | OBS | M3-L-5-0/TR | |||
SPX2945M3-L-3-3 | SOT-223-3 | -40 | 125 | OBS | SPX2945M3-L-3-3/TR | |||
SPX2945M3-L-3-3/TR | SOT-223-3 | -40 | 125 | Active | Click Buy Now | Order | ||
SPX2945M3-L-5-0 | SOT-223-3 | -40 | 125 | OBS | SPX2945M3-L-5-0/TR | |||
SPX2945M3-L-5-0/TR | SOT-223-3 | -40 | 125 | OBS | ||||
SPX2945R-3-3 | TO-252-3 | OBS | ||||||
SPX2945R-3-3/TR | TO-252-3 | -40 | 125 | OBS | ||||
SPX2945R-5-0 | TO-252-3 | -40 | 125 | OBS | ||||
SPX2945R-5-0/TR | TO-252-3 | OBS | ||||||
SPX2945R-L-3-3 | TO-252-3 | -40 | 125 | OBS | ||||
SPX2945R-L-3-3/TR | TO-252-3 | OBS | ||||||
SPX2945R-L-5-0 | TO-252-3 | -40 | 125 | OBS | ||||
SPX2945R-L-5-0/TR | TO-252-3 | OBS | ||||||
SPX2945S-3-3 | NSOIC8 | -40 | 125 | OBS | ||||
SPX2945S-3-3/TR | NSOIC8 | -40 | 125 | OBS | ||||
SPX2945S-5-0 | NSOIC8 | OBS | ||||||
SPX2945S-5-0/TR | NSOIC8 | OBS | ||||||
SPX2945S-L-3-3 | NSOIC8 | OBS | ||||||
SPX2945S-L-3-3/TR | NSOIC8 | -40 | 125 | OBS | ||||
SPX2945S-L-5-0 | NSOIC8 | -40 | 125 | OBS | ||||
SPX2945S-L-5-0/TR | NSOIC8 | OBS | ||||||
SPX2945T-3-3 | TO-263-3 | -40 | 125 | OBS | ||||
SPX2945T-3-3/TR | TO-263-3 | -40 | 125 | OBS | ||||
SPX2945T-5-0 | TO-263-3 | -40 | 125 | OBS | ||||
SPX2945T-5-0/TR | TO-263-3 | -40 | 125 | OBS | ||||
SPX2945T-L-3-3 | TO-263-3 | -40 | 125 | OBS | ||||
SPX2945T-L-3-3/TR | TO-263-3 | -40 | 125 | OBS | ||||
SPX2945T-L-5-0 | TO-263-3 | -40 | 125 | OBS | ||||
SPX2945T-L-5-0/TR | TO-263-3 | -40 | 125 | OBS | ||||
SPX2945T5-3-3 | TO-263-5 | -40 | 125 | OBS | ||||
SPX2945T5-3-3/TR | TO-263-5 | OBS | ||||||
SPX2945T5-5-0 | TO-263-5 | OBS | ||||||
SPX2945T5-5-0/TR | TO-263-5 | OBS | ||||||
SPX2945T5-L-3-3 | TO-263-5 | OBS | ||||||
SPX2945T5-L-3-3/TR | TO-263-5 | OBS | ||||||
SPX2945T5-L-5-0 | TO-263-5 | -40 | 125 | OBS | ||||
SPX2945T5-L-5-0/TR | TO-263-5 | OBS | ||||||
SPX2945U-3-3 | TO-220-3 | -40 | 125 | OBS | ||||
SPX2945U-5-0 | TO-220-3 | -40 | 125 | OBS | ||||
SPX2945U-L-3-3 | TO-220-3 | -40 | 125 | OBS | ||||
SPX2945U-L-5-0 | TO-220-3 | -40 | 125 | OBS |
Active - the part is released for sale, standard product.
EOL (End of Life) - the part is no longer being manufactured, there may or may not be inventory still in stock.
CF (Contact Factory) - the part is still active but customers should check with the factory for availability. Longer lead-times may apply.
PRE (Pre-introduction) - the part has not been introduced or the part number is an early version available for sample only.
OBS (Obsolete) - the part is no longer being manufactured and may not be ordered.
NRND (Not Recommended for New Designs) - the part is not recommended for new designs.
Packaging
Pkg Code | Details | Quantities | Dimensions |
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NSOIC8 |
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SOT-223-3 |
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TO-220-3 |
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TO-252-3 |
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TO-263-3 |
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TO-263-5 |
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Notifications
Distribution Date | Description | File |
---|---|---|
07/17/2023 | In 2023, MaxLinear will be converting all shipping labels for the parts noted from an EXAR format to MaxLinear’s label. During this transition customers may receive either label. This change affects only shipping and packing labels. This change will not affect the part number, part marking, manufacturing process or manufacturing sites. Only work in progress material will be converted. Existing inventory from MaxLinear’s warehouse, channel sales, distributor, and such, will not be converted. Hence, customers may experience receiving mixed shipments with both Exar and MaxLinear labels for some period until existing inventory of old labels is eventually cleared out. Situation is product to product with no predictable way to determine when all old labels will be exhausted. No change to product form, fit, function and reliability. ADDENDUM A: Fixed MBB label logo for DX204001 to MaxLinear logo. ADDENDUM B: Replaced ‘All other affected products outer box label’ with clearer pictures. Corrected Date Issued (from original PCN) issue date +90 days to August 30, 2023. | PCN & PDN Download |
06/01/2023 | In 2023, MaxLinear will be converting all shipping labels for the parts noted from an EXAR format to MaxLinear’s label. During this transition customers may receive either label. This change affects only shipping and packing labels. This change will not affect the part number, part marking, manufacturing process or manufacturing sites. Only work in progress material will be converted. Existing inventory from MaxLinear’s warehouse, channel sales, distributor, and such, will not be converted. Hence, customers may experience receiving mixed shipments with both Exar and MaxLinear labels for some period until existing inventory of old labels is eventually cleared out. Situation is product to product with no predictable way to determine when all old labels will be exhausted. No change to product form, fit, function and reliability. | PCN & PDN Download |
06/01/2023 | In 2023, MaxLinear will be converting all shipping labels for the parts noted from an EXAR format to MaxLinear’s label. During this transition customers may receive either label. This change affects only shipping and packing labels. This change will not affect the part number, part marking, manufacturing process or manufacturing sites. Only work in progress material will be converted. Existing inventory from MaxLinear’s warehouse, channel sales, distributor, and such, will not be converted. Hence, customers may experience receiving mixed shipments with both Exar and MaxLinear labels for some period until existing inventory of old labels is eventually cleared out. Situation is product to product with no predictable way to determine when all old labels will be exhausted. No change to product form, fit, function and reliability. ADDENDUM: Fixed MBB label logo for DX204001 to MaxLinear logo. | PCN & PDN Download |
07/11/2017 | Product Discontinuation Notification | PCN & PDN Download |
04/12/2017 | Qualification of alternate assembly subcon, JCET. | PCN & PDN Download |
07/26/2016 | Product discontinuation notification. Discontinued. | PCN & PDN Download |
09/09/2013 | Addition of an alternate qualified SOT-223 assembly site, Carsem (Malaysia) using Hitachi CEL9240 molding compound, in addition to the current qualified assembly site, Unisem (Ipoh) using Sumitomo G600 molding compound. Material Change & Alternate Assembly Site. | PCN & PDN Download |
02/06/2012 | Packing Change: The carrier tape size changed from 16x12 mm to 12x8 mm. Quantity per reel remains the same (2.5Ku per reel). Standardization and business consolidation. | PCN & PDN Download |
09/10/2008 | Notice of Obsolescence –Selected Power Management Parts This is notification that the Power Management products listed on the attached page have been discontinued by Exar Corporation due to low market demand, effective immediately. | PCN & PDN Download |
02/28/2007 | Product Obsolescence Letter and Discontinuation Notification. Discontinued. | PCN & PDN Download |
02/02/2006 | Announcing transfer of certain Power Management and Interface Products from Hillview fabrication and facility to wafer foundary Silan. See attached Product List Power Management and Interface products as listed are being transfer to external wafer foundry, due to cessation of operations of the sipex Hillview Fabrication manufacturing site | PCN & PDN Download |
FAQs & Support
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