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Mean Well EPS-45S-3.3 Power Supply 26W 3.3V 8A

Name: Mean Well EPS-45S-3.3 Power Supply 26W 3.3V 8A
Brand: Mean Well
SKU: EPS-45S-3.3
Price: 17.43 USD
Availability: InStock

3" x 2"economical non-PFCsmall sizehigh efficiency

SKU EPS-45S-3.3

$17.43 USD

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In stock

Overview

EPS-45S-3.3 is the 3.3V output model of this series: rated current 8A, rated power 26.4W, typical efficiency 80%.

EPS-45S is a 45W highly reliable green PCB type industrial power supply with a high power density on the 3” by 2” footprint. It accepts 80~264VAC input and offers various output voltages between 3.3V and 48V. The working efficiency is up to 91% and the extremely low no load power consumption is down below 0.1W. EPS-45S is able to be used for ClassⅡ(no FG) system design.

Features

3"×2" miniature size
Universal AC input / Full range
ClassⅡ(without FG) installations
No load power consumption<0.1W
High efficiency up to 91%
For 1U applications
Protections: Short circuit / Overload / Over voltage
Cooling by free air convection
-30~70℃wide range of operating temperature
Operating altitude up to 5000 meters
LED indicator for power on
3 years warranty

Specifications

EPS-45S-3.3Specifications from the official datasheet (2026-03-31 edition)

OUTPUT

DC VOLTAGE: 3.3V
RATED CURRENT: 8A
CURRENT RANGE: 0 ~ 8.8A
RATED POWER: 26.4W
PEAK LOAD(10sec.)^Note.2: 29W
RIPPLE & NOISE (max.)^Note.3: 80mVp-p
VOLTAGE ADJ.RANGE: 3.1~3.6V
VOLTAGE TOLERANCE^Note.4: ±2.0%
LINE REGULATION: ±0.5%
LOAD REGULATION: ±2.0%
SETUP, RISE TIME: 500ms, 30ms / 230VAC 500ms, 30ms / 115VAC at full load
HOLD UP TIME (Typ.): 30ms / 230VAC 12ms / 115VAC at full load

INPUT

VOLTAGE RANGE^Note.5: 80 ~ 264VAC
FREQUENCY RANGE: 47 ~ 63Hz
EFFICIENCY (Typ.): 80%
AC CURRENT (Typ.): 1.2A / 115VAC 1A / 230VAC
INRUSH CURRENT (Typ.): COLD STAR 30A/115VAC 60A/230VAC
LEAKAGE CURRENT(max.): 0.25mA/264VAC

PROTECTION

OVERLOAD: 115 ~ 150% rated output power Protection type : Hiccup mode, recovers automatically after fault condition is removed
OVER VOLTAGE: 3.8~5V Protection type : Shut down o/p voltage, re-power on to recover

ENVIRONMENT

WORKING TEMP.: -30 ~ +70℃ (Refer to "Derating Curve")
WORKING HUMIDITY: 20% ~ 90% RH non-condensing
STORAGE TEMP., HUMIDITY: -40 ~ +85℃, 10 ~ 95% RH
TEMP. COEFFICIENT: ±0.03% / ℃ (0 ~ 50℃)
OPERATING ALTITUDE^Note.7: 5000 meters
VIBRATION: 10 ~ 500Hz, 2G 10min./1cycle, period for 60min. each along X, Y, Z axes

SAFETY & EMC (Note. 8)

SAFETY STANDARDS: UL62368-1, TUV BS EN/EN62368-1, BS EN/EN60335-1, CCC GB4943.1, EAC TP TC 004 approved
WITHSTAND VOLTAGE: I/P-O/P: 3KVAC
ISOLATION RESISTANCE: I/P-O/P:100M Ohms / 500VDC / 25℃/ 70% RH
EMC EMISSION: Compliance to BS EN/EN55032(CISPR32) Class B, BS EN/EN61000-3-2,3, GB9254.1 Class B,GB17625 Class A, EAC TP TC 020
EMC IMMUNITY: Compliance to BS EN/EN61000-4-2,3,4,5,6,8,11, BS EN/EN55035, Heavy industry Level , EAC TP TC 020

OTHERS

MTBF: 3334.3K hrs min. Telcordia SR-332 (Bellcore) ; 706.6K hrs min. MIL-HDBK-217F (25℃)
DIMENSION: 76.2*50.8*24mm or 3" * 2" *0.945" inch (L*W*H)
PACKING: 0.11Kg; 120pcs/14.2Kg/0.94CUFT

Test conditions and notes8

1. All parameters NOT specially mentioned are measured at 230VAC input, rated load and 25℃ of ambient temperature.
2. 33% Duty cycle maximum within every 30 seconds. Average output power should not exceed the rated power.
3. Ripple & noise are measured at 20MHz of bandwidth by using a 12" twisted pair-wire terminated with a 0.1μF & 47μF parallel capacitor.
4. Tolerance : includes set up tolerance, line regulation and load regulation.
5. Derating may be needed under low input voltages. Please check the derating curve for more details.
6. Touch current was measured from primary input to DC output.
7. The ambient temperature derating of 3.5℃/1000m with fanless models and of 5℃/1000m with fan models for operating altitude higher than 2000m(6500ft).
8. The power supply is considered a component which will be installed into a final equipment. "All the EMC tests are been executed by mounting the unit on a 360mm*360mm metal plate with 1mm of thickness." The final equipment must be re-confirmed that it still meets EMC directives. For guidance on how to perform these EMC tests, please refer to “EMI testing of component power supplies.” (as available on https://www.meanwell.com//Upload/PDF/EMI_statement_en.pdf )

Technical drawings

EPS-45S-3.3 Block Diagram — Block Diagram

EPS-45S-3.3 Derating Curve — Derating Curve

EPS-45S-3.3 Mechanical Specification — Mechanical Specification

Typical applications

Industrial electrical equipment
Mechanical equipment
Factory automation equipment
Handheld electronic device

Downloads

Datasheet1

EPS-45S-3.3 datasheetEPS-45S-SPEC.PDF · 2026-03-31 edition PDF Download

Certificates9

Mean Well E183223 UL Certificate PDF Download

Mean Well EPS-65S-45S TUV Certificate PDF Download

Mean Well EPS-45S-65S TUV Certificate PDF Download

Mean Well EPS-45S-65S CB Certificate PDF Download

Mean Well EPS-45S-65S CB(UL) Certificate PDF Download

Mean Well EPS-45S-65S CB(TUV) Certificate PDF Download

Mean Well EPS-45S-EMC Certificate PDF Download

Mean Well EPS-45S-65S CE-dec Certificate PDF Download

Mean Well EPS-45S-65S UK-dec Certificate PDF Download

Test reports1

Mean Well EPS-45S-3.3 Test Report PDF Download

Catalogues1

Mean Well Catalog (Industrial) PDF Download

FAQ

Can I use the EPS-45S-3.3 for a 3.3V embedded controller or industrial logic board?

Yes, this model is a constant voltage supply with a 3.3V output and up to 8A available. That makes it suitable for 3.3V embedded controllers, industrial logic boards, and other low-voltage electronics that fit within its 26.4W rating.

Is the EPS-45S-3.3 a good fit for powering a 3.3V HMI interface or compact automation panel electronics?

It can be a good fit when the panel electronics require regulated 3.3V DC and stay within 26.4W and 8A. Its 76.2 x 50.8 x 24.0 mm size also suits compact internal equipment layouts where board space is limited.

Can this 3.3V power supply be used for industrial communication or embedded gateway hardware?

Yes, if the hardware is designed for constant 3.3V input and the total draw does not exceed 8A or 26.4W. That aligns well with many low-voltage embedded communication and gateway assemblies used inside control equipment.

Would the EPS-45S-3.3 work for low-voltage test fixtures or bench-level electronics inside industrial environments?

It is appropriate for low-voltage electronics that need a stable 3.3V constant voltage source and fit within 26.4W. The operating temperature range of -30°C to +70°C also supports use in a wide range of indoor industrial conditions.

Is the EPS-45S-3.3 suitable for outdoor or exposed environments?

No IP rating is listed in the provided specs, so this unit is better treated as an internal power supply for protected equipment rather than an exposed outdoor supply. Its operating temperature range is -30°C to +70°C, but environmental suitability should still be judged with the lack of a stated IP rating in mind.

How does the EPS-45S-3.3 compare with the other EPS-45S models?

Within the EPS-45S group, the available outputs are EPS-45S-3.3 at 26.4W, 3.3V, 8A; EPS-45S-5 at 40W, 5V, 8A; EPS-45S-7.5 at 40.5W, 7.5V, 5.4A; EPS-45S-12 at 45.6W, 12V, 3.8A; EPS-45S-15 at 45W, 15V, 3A; EPS-45S-24 at 45.6W, 24V, 1.9A; and EPS-45S-48 at 45.1W, 48V, 0.94A. This model is the lowest-voltage option in that set and also has the lowest wattage rating at 26.4W.

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