UCQ-1.2/30-D48 UCQ-1.5/25-D48 UCQ-1.5/40-D48 UCQ-1.8/30-D48 UCQ-2.5/40-D24 UCQ-2.5/30-D48 UCQ-3.3/35-D24

Physical

Outline dimensions

See mechanical specs.

Pin material

Copper alloy

Pin diameter

0.04/0.062 inches (1.016/1.524 mm)

Pin finish

Nickel underplate with gold overplate

Weight, ounces

1.06

1.06

0.9

0.9

1.06

1.06

1.02

Weight, grams

30

30

25

25

30

30

29

Electromagnetic

interference

FCC part 15, class B, EN55022

(Conducted and radiated. External filter required)

Safety

UL 60950-1, CSA C22.2 No.60950-1, IEC/EN 60950-1

Performance Specifications and Ordering Guide ➀

Caution: This product is not internally fused. To comply with safety agency certifications and to avoid injury to personnel or equipment, the user must supply an external fast-blow fuse to the input terminals.

See fuse information.

Specification Notes

(1) All models are tested and specified with external 1||10 µF ceramic/tantalum output capacitors no external input capacitor. All capacitors are low ESR types. These capacitors are necessary to accom-

modate our test equipment and may not be required to achieve specified performance in your applications. All models are stable and regulate within spec under no-load conditions. All specifications are

(3) Note that Maximum Power Derating curves indicate an average current at nominal input voltage. At higher temperatures and/or lower airflow, the DC/DC converter will tolerate brief full current outputs if

the total RMS current over time does not exceed the Derating curve. All Derating curves are presented at sea level altitude. Be aware of reduced power dissipation with increasing density altitude.

(4) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3, ground fixed conditions, Tpcboard = +25 deg.C, full output load, natural air convection.

(5) The On/Off Control is normally controlled by a switch or open collector or open drain transistor. But it may also be driven with external logic or by applying appropriate external voltages which are

referenced to Input Common.

(6) Short circuit shutdown begins when the output voltage degrades approximately 2% from the selected setting.

(7) The outputs are not intended to sink appreciable reverse current. This may damage the outputs.

(8) Output noise may be further reduced by adding an external filter. See I/O Filtering and Noise Reduction.

(9) All models are fully operational and meet published specifications, including “cold start” at –40 C.

(10) Regulation specifications describe the deviation as the line input voltage or output load current is varied from a nominal midpoint value to either extreme.

(11) Output accuracy is dependent on user-supplied trim resistors. To achieve high accuracy, use ±1% or better tolerance metal-film resistors mounted close to the converter.

(12) Output current limit and short circuit protection is non-latching. When the overcurrent fault is removed, the converter will immediately recover.

(13) Do not exceed maximum power specifications when adjusting the output trim.

(14) At zero output current, the output may contain low frequency components which exceed the ripple specification. The output may be operated indefinitely with no load.

(15) Input Fusing: If reverse polarity is accidentally applied to the input, a body diode will become forward biased and will conduct considerable current. To ensure reverse input protection with full output load,

(16) “Hiccup” overcurrent operation repeatedly attempts to restart the converter with a brief, full-current output. If the overcurrent condition still exists, the restart current will be removed and then tried again.

This short current pulse prevents overheating and damaging the converter. Once the fault is removed, the converter immediately recovers normal operation.

UCQ-3.3/20-D48 UCQ-3.3/30-D48 UCQ-5/20-D24

UCQ-5/20-D48 UCQ-12/8.3-D48

Physical

Outline dimensions

See mechanical specs.

Pin material

Copper alloy

Pin diameter

0.04/0.062 inches (1.016/1.524 mm)

Pin finish

Nickel underplate with gold overplate

Weight, ounces

0.7

TBD

1.06

TBD

1.13

Weight, grams

20

TBD

30

TBD

32

Electromagnetic

interference

FCC part 15, class B, EN55022

(Conducted and radiated. External filter required)

Safety

UL 60950-1, CSA C22.2 No.60950-1, IEC/EN 60950-1

Single Output UCQ Models

Low-Profile, Quarter Brick, 8.3-40 Amp

Isolated DC/DC Converters

www.murata-ps.com

MDC_UCQ Models.B07 Page 8 of 16