Features 100% RS-485 compliant Guaranteed RS-485 device interoperation Low power CMOS design: ICC 500 µA max Built-in power up/down glitch-free circuitry Permits live transceiver insertion/displacement DIP and SOIC packages available Industrial temperature range: -40°C to +85°C On-board thermal shutdown circuitry Prevents damage to the device in the event of excessive power dissipation Wide common mode range: -7V to +12V Receiver open input fail-safe ¼ unit load (DS36C278): >=128 nodes ½ unit load (DS36C278T): >=64 nodes ESD (human body model): >=2 kV Drop in replacement for: LTC485, MAX485, DS75176, DS3695 Description The DS36C278 is a low power differential bus/line transceiver designed to meet the requirements of RS-485 standard for multipoint data transmission. In addition it is compatible with TIA/EIA-422-B. The CMOS design offers significant power savings over its bipolar and ALS counterparts without sacrificing ruggedness against ESD damage. The device is ideal for use in battery powered or power conscious applications. ICC is specified at 500 µA maximum. The driver and receiver outputs feature TRI-STATE® capability. The driver outputs operate over the entire common mode range of -7V to +12V. Bus contention or fault situations that cause excessive power dissipation within the device are handled by a thermal shutdown circuit, which forces the driver outputs into the high impedance state. The receiver incorporates a fail safe circuit which guarantees a high output state when the inputs are left open. The DS36C278T is fully specified over the industrial temperature range (-40°C to +85°C).

Typical Application click for larger image	Connection Diagram click for larger image

Datasheets

Title		Size	Date	Other Language
	DS36C278 Low Power Multipoint TIA/EIA-485 Transceiver	583 Kbytes	11-Nov-04	日本語

Application Notes

Title		Size	Date	Other Language
	AN-1057: Application Note 1057 Ten Ways to Bulletproof RS-485 Interfaces	155 Kbytes	2-Oct-02

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
DS36C278M/NOPB DS36C278M RoHS Status	SOIC NARROW	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 1087 AVNET-EM Worldwide 175 DIGI-KEY Worldwide 274 FARNELL Europe and Asia 84 MOUSER Worldwide 380 NEWARK Americas 84 TAYLOR Americas 1087	$0.99 each at 1K+ pcs	rail of 95
DS36C278MX/NOPB DS36C278MX RoHS Status	SOIC NARROW	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 10000 AVNET-EM Worldwide 2500 DIGI-KEY Worldwide 0 TAYLOR Americas 10000	$0.99 each at 1K+ pcs	reel of 2500
DS36C278TM/NOPB DS36C278TM RoHS Status	SOIC NARROW	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 1311 AVNET-EM Worldwide 208 DIGI-KEY Worldwide 994 FARNELL Europe and Asia 877 MOUSER Worldwide 474 NEWARK Americas 510 TAYLOR Americas 2001	$0.83 each at 1K+ pcs	rail of 95
DS36C278TMX/NOPB DS36C278TMX RoHS Status	SOIC NARROW	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 2500 AVNET-EM Worldwide 7500 DIGI-KEY Worldwide 0 TAYLOR Americas 2500	$0.83 each at 1K+ pcs	reel of 2500

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
DS36C278N	SP485	SIPEX CORP	03 Mar 2006
DS36C278TN	LTC485	LINEAR TECHNOLOGY	16 Nov 2008

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for DS36C278.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for DS36C278 is located at RoHS Status.

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
DS36C278M/NOPB DS36C278M	69.761 70.001	SOIC NARROW	8	1 1	260 235	Detail	Download	N/A	NSZXTT DS36C 278M
DS36C278MX/NOPB DS36C278MX	69.761 70.001	SOIC NARROW	8	1 1	260 235	Detail	Download	N/A	NSZXTT DS36C 278M
DS36C278TM/NOPB DS36C278TM	69.761 70.001	SOIC NARROW	8	1 1	260 235	Detail	Download	N/A	NSZXTT 36C27 8TM
DS36C278TMX/NOPB DS36C278TMX	69.761 70.001	SOIC NARROW	8	1 1	260 235	Detail	Download	N/A	NSZXTT 36C27 8TM

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for DS36C278.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for DS36C278 is located at RoHS Status.

CAD Symbols and Models Download DS36C278 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
DS36C278M	LMDMOS	0	18295	0	0	2650000	2	751944735
DS36C278MX	LMDMOS	0	18295	0	0	2650000	2	751944735
DS36C278TM	LMDMOS	0	18295	0	0	2650000	2	751944735
DS36C278TMX	LMDMOS	0	18295	0	0	2650000	2	751944735

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for DS36C278.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for DS36C278 is located at RoHS Status.

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
DS36C278N	SP485	SIPEX CORP	03 Mar 2006
DS36C278TN	LTC485	LINEAR TECHNOLOGY	16 Nov 2008