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RLD78PPY4
Laser Diodes
AlGaAs laser diode
RLD78PPY4
The RLD78PPY4 is infrared laser diode high power output type (pulse 240mW). This is the best for optical disk drive use, such as CD-R/RW.
Applications Max. X52 speed CD-R/RW drives.
Features 1) Absolute maximum optical power output : pulse 240mW 2) Wave length : Typ. 784nm 3) 5.6mm small packages
Dimensions (Unit : mm)
902 0.40.1
Equivalent circuit diagram
1.0Min.
P t y p e
4.4+0
(3) L.D. (1) (2)
1.00.1
5.6
+0 -0.025
3.6 1.20.1 2.3 6.50.5 (1.35)
3-0.45 (3) (2) (1)
Chip
Absolute maximum ratings (Tc=25C)
Parameter Output Reverse voltage Raser PIN photodiode Symbol PO VR VR(PIN) Topr Tstg Limits Pulsed 240 Pulse condition : pulse 50ns, Duty50% 2 - -10 to +70 (Pulsed) -40 to +85 Unit mW V - C C
Operating temperature Storage temperature
1/2
RLD78PPY4
Laser Diodes
Electrical and optical characteristics (Tc=25CCW)
Parameter Threshold current Operating current Operating voltage Differential efficiency Parallel divergence angle Perpendicular divergence angle Parallel deviation angle Perpendicular deviation angle Emission point accuracy Peak emission wavelength Astigmatism Symbol Ith Iop Vop // Min. - - - 0.7 7 14 -2 -3 -80 777 - Typ. 35 133 2.1 0.9 8 17 0 0 0 784 - Max. 50 165 2.5 1.4 10 19 +2 +3 +80 789 6 Unit mA mA V mW/mA deg deg deg deg m nm m PO=90mW NA=0.15, PO=90mW - PO=90mW Conditions -
//
X Y Z
// and are defined as the angle within which the intensity is 50% of the peak value.
Electrical and optical characteristics curves
250 Tc=25C 50C 70C 90C
Pulse 70ns 50%
6 5
20 18 16 14
Se (mW / mA) FFP (deg)
4 3
WAVELENGTH : (nm)
800
795 790 785 780 775
OPTICAL POWER : PO (mW)
200
150
12 10 8 6 4
100 2 50 1 0 0
2 0 0 20 40 60 80 100
770 0 20 40 60 80 100
0
100
200
300
400
OPERATING CURRENT : IF (mA)
Po (mW)
PACKAGE TEMPERATURE : TC (C)
Fig.1 Optical output vs. operating current
Fig.2 PO vs. FFP
Fig.3 Dependence of wavelength on temperature
2/2
Appendix
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any means without prior permission of ROHM CO.,LTD. The contents described herein are subject to change without notice. The specifications for the product described in this document are for reference only. Upon actual use, therefore, please request that specifications to be separately delivered. Application circuit diagrams and circuit constants contained herein are shown as examples of standard use and operation. Please pay careful attention to the peripheral conditions when designing circuits and deciding upon circuit constants in the set. Any data, including, but not limited to application circuit diagrams information, described herein are intended only as illustrations of such devices and not as the specifications for such devices. ROHM CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any third party's intellectual property rights or other proprietary rights, and further, assumes no liability of whatsoever nature in the event of any such infringement, or arising from or connected with or related to the use of such devices. Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or otherwise dispose of the same, no express or implied right or license to practice or commercially exploit any intellectual property rights or other proprietary rights owned or controlled by ROHM CO., LTD. is granted to any such buyer. Products listed in this document are no antiradiation design.
The products listed in this document are designed to be used with ordinary electronic equipment or devices (such as audio visual equipment, office-automation equipment, communications devices, electrical appliances and electronic toys). Should you intend to use these products with equipment or devices which require an extremely high level of reliability and the malfunction of which would directly endanger human life (such as medical instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other safety devices), please be sure to consult with our sales representative in advance. It is our top priority to supply products with the utmost quality and reliability. However, there is always a chance of failure due to unexpected factors. Therefore, please take into account the derating characteristics and allow for sufficient safety features, such as extra margin, anti-flammability, and fail-safe measures when designing in order to prevent possible accidents that may result in bodily harm or fire caused by component failure. ROHM cannot be held responsible for any damages arising from the use of the products under conditions out of the range of the specifications or due to non-compliance with the NOTES specified in this catalog.
Thank you for your accessing to ROHM product informations. More detail product informations and catalogs are available, please contact your nearest sales office.
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Appendix1-Rev2.0

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