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Close up of RA7129-BL_
Datasheet

RA7129-BLD

RoHS compliant

For more information and specification about the part.

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Typical Application

Works with Texas Instruments PM8804

Input Voltage Output Power
36 V — 72 V 5 V , 20 A 100 W

Specifications

Electrical specifications at 25°C.

Active Clamp Forward Transformer

Part number
(Hover for schematics)
Inductance
at 0A (µH) 1
(Tolerance: ±25%) 		DCR max (Ω) Leakage
Inductance
max (µH) 2 		Turns Ratio Isolation
Voltage (Vrms) 3
Pri Sec Aux/Bias Pri : Sec : Aux/Bias
RA7129-BL_ 134 0.027 0.004 0.174 0.180 1 : 0.333 : 0.667 1500
Notes
  1. Inductance for is for the primary, measured at 250 kHz, 0.2 Vrms, 0 Adc.
  2. Leakage inductance is for the primary winding with the secondary windings shorted.
  3. Isolation (hipot) is measured for one minute: 1500 Vrms from primary and aux/bias to secondary; 500 Vrms from primary to aux/bias.

Termination:

  • RoHS-compliant. 260°C compatible. Tin-silver-copper over tin over nickel over phos bronze terminations. Other terminations available at additional cost.

Packaging:

  • D = 13″ machine-ready reel. EIA-481 embossed plastic tape (175 parts per full reel). Quantities less than full reel available: in tape (not machine ready) or with leader and trailer ($25 charge).
Environmental
Environmental:
RoHS compliant
Ambient temperature range:
–40°C to +125°C
Storage temperature range:
Component: −40°C to +165°C
Tape and reel packaging: −40°C to +80°C
Maximum part temperature:
+165°C (ambient + self-heating)
Failures in Time (FIT) / Mean Time Between Failures (MTBF):
See FIT/MTBF Calculations

Schematics

ra7129s.gif
Connect pin 1 to 2 and pin 3 to 4 on the PC board.
Connect pins 10, 11, and 12 together and
pins 7, 8, and 9 together on the PC board.
 

Physical characteristics

ra7129d.gif

Tape and Reel specification

tapereel_pl.gif

 
Parts per reel Reel dimensions (mm) Tape dimensions (mm) Orientation
13" (330 mm) A B C D E W P Po P1 H T part_or_c.gif
175 330 100 13 50,4 44,4 44 32 4 2 12,0 0,5

General specification

Core Material:
Ferrite
Weight:
11.5 – 13.5 g
Packaging:
175 per 13″ reel Plastic tape: 44 mm wide, 0.5 mm thick, 32 mm pocket spacing, 12 mm pocket depth

Soldering/Washing

Moisture Sensitivity Level (MSL):
1 (unlimited floor life at <30°C / 85% relative humidity)
Resistance to soldering heat:
Max three 40 second reflows at +260°C, parts cooled to room temperature between cycles
Refer to Soldering Coilcraft Components before soldering.
PCB Washing:
Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. More info.

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