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U7803-500R3
● Low ripple and noise
● No external heat sink required
- Product Description
- Parameter Introduction
- Precautions
-
● Efficiency as high as 94 %
● Low ripple, noise
● No external heat sink required.
● Short-circuit protection, overheat protection
● Operating temperature range: -40℃~ +85℃
● Ultra-small SIP Packaging, meeting UL 94 - V0 Requirements
● High reliability ( MTTF ≥ 100 Ten thousand hours)
● International standard pin configuration
● Eco-friendly design, compliant with RoHS Instruction
● 100 % Full-load aging
-
Product Model List
Model number
Rated Input Voltage (V)
Rated output
Typical Efficiency (%)
Maximum capacitive load
(uF)
Nominal
Scope
Voltage (V)
Current (mA)
Wine
smallest
Maximum
U7803-500R3
48
9~72
3.3
500
82
75
100
U7805-500R3
5
87
81
U786.5-500R3
6.5
91
84
U7809-500R3
14~72
9
92
86
U7812-500R3
17~72
12
93
89
U7815-500R3
20~72
15
94
90
Output characteristics
Project
Conditions
smallest
Typical
Maximum
Unit
Output voltage accuracy
10%–100% load, input voltage range
±2
±3
%
Line regulation
Full load, input voltage range
±0.5
±2.0
Load Regulation Rate
Under nominal input conditions, the load varies from 10% to 100%.
±1.0
±2.0
Temperature drift coefficient
-40℃ ~ +85℃
±0.03
%/°C
Ripple & Noise
Bandwidth: 20 MHz, using the parallel‑line method.
40
80
mVp-p
Switching frequency
100% load, input voltage across the full range
200
KHz
Output short-circuit protection
Continuous short-circuit protection (self-resetting)
Input characteristics
Project
Conditions
smallest
Typical
Maximum
Unit
No-load current
48VDC input
1.5
mA
Input Filtering Type
Pi-type filter
Reverse polarity input
Prohibition
EMC Characteristics
EMI
Conducted interference
CISPR 32/EN 55032 Class B (see EMI circuit recommendations for details)
Radiated interference
CISPR 32/EN 55032 Class B (see EMI circuit recommendations for details)
EMS
Electrostatic discharge
IEC/EN61000-4-2 CONTACT ±4KV perf. Criteria B
Radiation immunity
IEC/EN61000-4-3 10V/M Performance. Criterion A
Pulse group immunity
IEC/EN 61000-4-4 ±2 kV (see EMS circuit recommendations for details) Performance Criterion B
Surge immunity
IEC/EN61000-4-5 LINE TO LINE ±2kV (see EMS circuit recommendations for details) Performance Criterion B
Conducted Emission Immunity
IEC/EN61000-4-6 3 VR. M. S Performance Criterion A
Immunity to voltage sags, dips, and short interruptions
IEC/EN61000-4-29 0%, 70% Performance Criterion B
General Characteristics
Project
Conditions
smallest
Typical
Maximum
Unit
Storage humidity
No condensation
5
95
%
Operating temperature
-40
85
°C
Storage temperature
-55
125
Case temperature rise during operation
15
25
Pin soldering temperature resistance
Solder joint is 1.5 mm from the housing; apply for 10 seconds.
300
MTTF
MIL-HDBK-217@25℃
100
Ten thousand hours
Weight
3.8
Kerl
Cooling method
Natural air cooling
Housing material
Flame-retardant, heat-resistant plastic (UL94-V0)
-
● Increase the external capacitors C1 and C2 appropriately based on the operating conditions, and ensure that these external capacitors are placed as close as possible to the pins of the U78 series.
● For applications with stringent ripple noise requirements, an external component should be connected. LC Filter circuit, where L is typically taken as 10. uH -47 uH , a low‑value capacitor can be selected. ESR Capacitors and Electrolytics Capacitor, as shown in the figure:
● This product series does not support hot-swapping for inputs or parallel operation of outputs.
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