KF2003-GK42A Printheads Compact medium speed thick film thermal printhead (8dots / mm) KF2003-GK42A KF2003-GK42A is suitable for devices, such as high-speed POS and label printer applications, that require thermal printheads capable of higher printing rates. Improved power circuit design means that with heavier current it is possible to print at speeds as high as 150 mm/s. The GK Series is the thus ideal for label printers that need high printing rates. !Applications POS terminals, Label printers, CAT terminals, Multi-purpose small-sized printers !Features 1) Using a special compact partial glaze and new heating element structure, achieves high-speed printing at 150 mm/s. 2) The use of the newly developed highly-durable conductive protective film has improved countermeasures against static electricity. 3) The VH and GND sections of the power circuitry have been strengthened so that heavier current can be applied. 4) Ultra small connectors, designed to conform with FFCs, and miniature driver chips have been used. Although the resulting printheads are surprisingly compact and lightweight, they can be used with large platens of up to 20 mm in diameter. 5) One rank resistance value of 800Ω ± 3% eliminates the inconvenience of rank selection. 6) 2-inch, 3-inch and 4-inch series are available. Max.1.7 81 72 (Effective Print Width) Dot #576 (5.1) Dot #1 M AX . φ2 0 .0 Max.17.5 2.6±0.1 !External dimensions (Units : mm) No.1 No.28 5±0.2 Exposed Conductor Side 10.2 5.1±0.1 71±0.2 Insert Direction Connector 2-M3 (Effective Depth 3) 1/4 KF2003-GK42A Printheads !Equivalent circuit VH GND 1, 2, 3, 4, 25, 26, 27, 28 DOT #576 4 STB4 STB3 STB2 STB1 LAT DI CLK DO V DD TM TM DOT #1 11, 12, 13, 14, 15, 16, 17, 18, 19 3 2 1 144 OUTPUTS EACH 22 23 8 9 7 LATCH REGISTER 24 SHIFT REGISTER 6 5 21 10 THERMISTOR 30kΩ B:3950k 20 CONNECTOR Fig.1 !Pin assignments No. Circuit No. Circuit 1 VH 15 GND 2 VH 16 GND 3 VH 17 GND 4 VH 18 GND 5 DO 19 GND 6 CLK 20 TM 7 LAT 21 VDD 8 STB2 22 STB4 9 STB1 23 STB3 10 TM 24 DI 11 GND 25 VH 12 GND 26 VH 13 GND 27 VH 14 GND 28 VH 2/4 KF2003-GK42A Printheads !Timing chart tw CLK CLOCK (CLK) t setup DI t hold DI DATA IN (DI) "High":BLACK "Low" :WHITE td DO DATA OUT (DO) "High":BLACK "Low" :WHITE t setup LAT t hold LAT LATCH (LAT) "High":HOLD "Low" :THROUGH tw LAT t setup STB STROBE (STB) tdo tdo DRIVER OUT Fig.2 !Characteristics Symbol Typical Unit Effective printing width − 72.0 mm Dot pitch − 0.125 mm Parameter − 576 dots Rave 800 Ω Applied voltage VH 24.0 V Applied power PO 0.59 W/dot Total dot number Average resistance value Print cycle SLT 1.0 ms Pulse width TON 0.43 ms Maximum number of dots energized simultaneously − 288 dots Maximum clock frequency − 4 MHz Maximum roller diameter − φ20.0 mm Running life / pulse life − 50/5×107 km/pulses Operating temperature − 5~45 °C 3/4 KF2003-GK42A Printheads !Electrical characteristic curves 0.8 0.8 1.8 Paper : KF50-HDA (OJI) 0.7 1.4 0.5 0.4 0.3 1.2 1.0 0.8 0.6 0.2 0.4 0.1 0.2 0 0 1 2 3 4 5 SCANNING LINE TIME (ms/line) 0.6 ENERGY (mJ/dot) OPTICAL DENSITY 0.6 ENERGY (mJ/dot) SLT : 1.00ms/line 1.6 0.7 0.0 0.00 0.4 0.3 0.2 0.1 0.05 0.10 0.15 0.20 0.25 0.30 ENERGY (mJ/dot) Fig.3 Adaptive speed chart 0.5 Fig.4 Representative density curve 0 0 1 2 3 4 5 SCANNING LINE TIME (ms/line) Fig.5 Maximum energy curve 180 160 RESISTANCE : (kΩ) 140 120 100 80 60 40 20 0 −20 −10 0 10 20 30 40 50 60 70 TEMPERATURE : (°C) Fig.6 Thermistor curve 4/4 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 use silicon as a basic material. 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 with 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. About Export Control Order in Japan Products described herein are the objects of controlled goods in Annex 1 (Item 16) of Export Trade Control Order in Japan. In case of export from Japan, please confirm if it applies to "objective" criteria or an "informed" (by MITI clause) on the basis of "catch all controls for Non-Proliferation of Weapons of Mass Destruction. Appendix1-Rev1.0