BC857BS

Document overview

  • Manufacturer or author: Provided By digicamel.com
  • PDF pages: 6

Technical content

Features

  • Ultra-Small Surface-Mount Package
  • Ideally Suited for Automated Insertion
  • For switching and AF Amplifier Application
  • Totally Lead-Free & Fully RoHS compliant (Notes 1 & 2)
  • Halogen and Antimony Free. "Green" Device (Note 3)
  • For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/104/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. https://www.diodes.com/quality/product-definitions/ Mechanical Data
  • Package: SOT363
  • Package Material: Molded Plastic, “Green” Molding Compound UL Flammability Classification Rating 94V-0
  • Moisture Sensitivity: Level 1 per J-STD-020
  • Terminals: Finish ⎯ Matte Tin Finish. Solderable per MIL-STD- 202, Method 208
  • Weight: 0.006 grams (Approximate) Ordering Information (Note 4) Orderable Part Number Package Marking Reel Size (inches) Tape Width (mm) Packing Qty. Carrier BC857BS-7-F SOT363 K3W 7 8 3,000 Reel BC857BS-13-F SOT363 K3W 13 8 10,000 Reel Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant. 2. See https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen - and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds. 4. For packaging details, go to our website at https://www.diodes.com/design/support/packaging/diodes -packaging/. Marking Information Date Code Key Year 2003 - 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 Code P - N P R S T U V W X Y Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Code 1 2 3 4 5 6 7 8 9 O N D Device Symbol K3W = Product Type Marking Code YM = Date Code Marking Y = Year (ex: N = 2026) M = Month (ex: 9 = September) Top View SOT363 Top View Pinout SOT363

Document number: DS30373 Rev. 9 - 2 2 of 6 www.diodes.com June 2026 © 2026 Copyright Diodes Incorporated. All Rights Reserved. BC857BS Absolute Maximum Ratings (TA = +25° C unless otherwise specified.) Characteristic Symbol Value Unit Collector-Base Voltage VCBO -50 V Collector-Emitter Voltage VCEO -45 V Emitter-Base Voltage VEBO -5.0 V Collector Current IC -100 mA Peak Collector Current ICM -200 mA Peak Base Current IBM -200 mA Thermal Characteristics (TA = +25° C unless otherwise specified.) Characteristic Symbol Value Unit Power Dissipation (Note 5) PD 200 mW Thermal Resistance, Junction to Ambient Air (Note 5) RJA 625 C/W Operating and Storage Temperature Range TJ, TSTG -55 to +150 C Notes: 5. For the device mounted on minimum recommended pad layout FR4 PCB single sided 1oz copper, in still air conditions ; the device with one active die is measured when operating in a steady-state condition. Thermal Characteristics Graphs (TA = +25° C unless otherwise specified.)

Document number: DS30373 Rev. 9 - 2 3 of 6 www.diodes.com June 2026 © 2026 Copyright Diodes Incorporated. All Rights Reserved. BC857BS Electrical Characteristics (TA = +25° C unless otherwise specified.) Characteristic (Note 6) Symbol Min Typ Max Unit Test Condition Collector-Base Breakdown Voltage BVCBO -50 — — V IC = 100µA, IB = 0 Collector-Emitter Breakdown Voltage BVCEO -45 — — V IC = 10mA, IB = 0 Emitter-Base Breakdown Voltage BVEBO -5 — — V IE = 100µA, IC = 0 DC Current Gain hFE 220 — 475 — VCE = -5.0V, IC = -2.0mA Collector-Emitter Saturation Voltage VCE(sat) — — -100 -400 mV IC = -10mA, IB = -0.5mA IC = -100mA, IB = -5.0mA Base-Emitter Saturation Voltage VBE(sat) — -700 — mV IC = -10mA, IB = -0.5mA Base-Emitter Voltage VBE(on) -580 -665 -750 mV VCE = -5.0V, IC = -2.0mA Collector-Cutoff Current ICBO — -15 -4.0 nA µA VCB = -30V VCB = -30V, TA = +150° C Emitter Cutoff Current IEBO — — -100 nA VEB = -5.0V, IC = 0 Gain Bandwidth Product fT 100 — — MHz VCE = -5.0V, IC = -10mA, f = 100MHz Collector-Base Capacitance CCBO — 2 3 pF VCB = -10V, f = 1.0MHz Emitter-Base Capacitance CEBO — 11 — pF VEB = -0.5V, f = 1.0MHz Notes: 6. Short duration pulse test used to minimize self-heating effect.

Document number: DS30373 Rev. 9 - 2 4 of 6 www.diodes.com June 2026 © 2026 Copyright Diodes Incorporated. All Rights Reserved. BC857BS Typical Electrical Characteristics (TA = +25° C unless otherwise specified.) 100 1,000 10 1001 h DC CURRENT GAINFE, I , COLLECTOR CURRENT (mA) Fig. 2 Typical DC Current Gain vs. Collector Current C 0.1 0.2 0.3 0.4 0.5 0.1 1 10 100 1,000 V , COLLECTOR-EMITTER SATURATION VOLTAGE (V) CE I , COLLECTOR CURRENT (mA) Fig. 3 Typical Collector-Emitter Saturation Voltage vs. Collector Current C 100 1,000 1 10 100 f , GAIN-BANDWIDTH PRODUCT (MHz)T I , COLLECTOR CURRENT (mA) Fig. 4 Typical Gain-Bandwidth Product vs. Collector Current C VCE(sat), COLLECTOR-EMITTER SATURATION VOLTAGE (V) Fig. 4 Fig. 5 Fig. 6

Document number: DS30373 Rev. 9 - 2 5 of 6 www.diodes.com June 2026 © 2026 Copyright Diodes Incorporated. All Rights Reserved. BC857BS Package Outline Dimensions Please see http://www.diodes.com/package-outlines.html for the latest version. SOT363 SOT363 Dim Min Max Typ A1 0.00 0.10 0.05 A2 0.90 1.00 0.95 b 0.10 0.30 0.25 c 0.10 0.22 0.11 D 1.80 2.20 2.15 E 2.00 2.20 2.10 E1 1.15 1.35 1.30 e 0.650 BSC F 0.40 0.45 0.425 L 0.25 0.40 0.30 a 0° 8° -- All Dimensions in mm Suggested Pad Layout Please see http://www.diodes.com/package-outlines.html for the latest version. SOT363 Dimensions Value (in mm) C 0.650 G 1.300 X 0.420 Y 0.600 Y1 2.500 e D L b E F c a Y1 G Y X C

Document number: DS30373 Rev. 9 - 2 6 of 6 www.diodes.com June 2026 © 2026 Copyright Diodes Incorporated. All Rights Reserved. BC857BS IMPORTANT NOTICE 1. DIODES INCORPORATED (Diodes) AND ITS SUBSIDIARIES MAKE NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO ANY INFORMATION CONTAINED IN THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICUL AR PURPOSE OR NON -INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY RIGHTS (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). 2. The Information contained herein is for informational purpose only and is provided only to illustrate the operation of Diodes ’ products described herein and application examples. Diodes does not assume any liability arising out of the application or use of this document or any product described herein. This document is intended for skilled and technically trained engineering customers and users who design with Diodes’ products. Diodes’ products may be used to facilitate safety-related applications; however, in all instances customers and users are responsible for (a) selecting the appropriate Diodes products for their applications, (b) evaluating the suitability of Diodes’ products for their intended applications, (c) ensuring their applications, which inco rporate Diodes’ products, comply the applicable legal and regulatory requirements as well as safety and functional - safety related standards, and (d) ensuring they design with appropriate safeguards (including testing, validation, quality co ntrol techniques , redundancy, malfunction prevention, and appropriate treatment for aging degradation) to minimize the risks associated with their applications. 3. Diodes assumes no liability for any application-related information, support, assistance or feedback that may be provided by Diodes from time to time. Any customer or user of this document or products described herein will assume all risks and liabilities associated with such use, and will hold Diodes and all companies whose products are represented herein or on Diodes’ websites, harmless against all damages and liabilities. 4. Products described herein may be covered by one or more United States, international or foreign patents and pending patent applications. Product names and markings noted herein may also be covered by one or more United States, international or foreign tra demarks and trademark applications. Diodes does not convey any license under any of its intellectual property rights or the rights of any third parties (including third parties whose products and services may be described in this document or on Diodes’ website) under this document. 5. Diodes’ products are provided subject to Diodes’ Standard Terms and Conditions of Sale (https://www.diodes.com/about/company/terms-and-conditions/terms-and-conditions-of-sales/) or other applicable terms. This document does not alter or expand the applicable warranties provided by Diodes. Diodes does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. 6. Diodes’ products and technology may not be used for or incorporated into any products or systems whose manufacture, use or sa le is prohibited under any applicable laws and regulations. Should customers or users use Diodes’ products in contravention of any applicable laws or regulations, or for any unintended or unauthorized application, customers and users will (a) be solely responsible for any da mages, losses or penalties arising in connection therewith or as a result thereof, and (b) indemnify and hold D iodes and its representatives and agents harmless against any and all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim relating to any noncompliance with the applicable laws and regulations, as well as any unintended or unauthorized application. 7. While efforts have been made to ensure the information contained in this document is accurate, complete and current, it may c ontain technical inaccuracies, omissions and typographical errors. Diodes does not warrant that information contained in this docu ment is error-free and Diodes is under no obligation to update or otherwise correct this information. Notwithstanding the foregoing, Diodes reserves the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the final and determinative format released by Diodes. 8. Any unauthorized copying, modification, distribution, transmission, display or other use of this document (or any portion her eof) is prohibited. Diodes assumes no responsibility for any losses incurred by the customers or users or any third parties arising from any such unauthorized use. 9. This Notice may be periodically updated with the most recent version available at https://www.diodes.com/about/company/terms-and- conditions/important-notice The Diodes logo is a registered trademark of Diodes Incorporated in the United States and other countries. All other trademarks are the property of their respective owners. © 2026 Diodes Incorporated. All Rights Reserved. www.diodes.com