LTC4257IS8 Linear Technology, LTC4257IS8 Datasheet - Page 19

• Manufacturer Part Number: LTC4257IS8
• Description: IC CONTROLLER POE INTERFAC 8SOIC
• Manufacturer: Linear Technology
• Type: Power over Ethernet Switch (PoE)r

Specifications of LTC4257IS8

• Applications: IP Phones, Power over LAN, Network Routers and Switches
• Internal Switch(s): Yes
• Current Limit: 350mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

PACKAGE DESCRIPTIO
.030 ±.005
3.5 ±0.05
NOTE:
1. DIMENSIONS IN
2. DRAWING NOT TO SCALE
TYP
.245
MIN
2.15 ±0.05
RECOMMENDED SOLDER PAD LAYOUT
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
.050 BSC
1.65 ±0.05
(2 SIDES)
0.25 ± 0.05
(MILLIMETERS)
INCHES
2.38 ±0.05
(2 SIDES)
.045 ±.005
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
.160 ±.005
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
0.50
BSC
(5.791 – 6.197)
.228 – .244
U
0.675 ±0.05
8-Lead Plastic Small Outline (Narrow .150 Inch)
PACKAGE
OUTLINE
8-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1698)
(Reference LTC DWG # 05-08-1610)
1
8
TOP MARK
(NOTE 6)
(4.801 – 5.004)
.189 – .197
PIN 1
7
2
0.200 REF
DD Package
NOTE 3
S8 Package
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1)
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
ON TOP AND BOTTOM OF PACKAGE
6
3
5
4
(3.810 – 3.988)
.150 – .157
NOTE 3
3.00 ±0.10
0.75 ±0.05
(4 SIDES)
(0.203 – 0.254)
.008 – .010
(1.346 – 1.752)
(0.355 – 0.483)
0.00 – 0.05
.053 – .069
.014 – .019
TYP
1.65 ± 0.10
(0.254 – 0.508)
(2 SIDES)
.010 – .020
(0.406 – 1.270)
BOTTOM VIEW—EXPOSED PAD
.016 – .050
0.25 ± 0.05
R = 0.115
× 45°
TYP
4
5
2.38 ±0.10
(2 SIDES)
LTC4257
(1.270)
.050
BSC
0°– 8° TYP
8
1
0.50 BSC
(0.101 – 0.254)
.004 – .010
0.38 ± 0.10
19
(DD8) DFN 1203
4257fb
SO8 0303