Features High slew rate 1800 V/μs Wide bandwidth 110 MHz Continuous output current ±300 mA Output current limit tolerance ±5 mA ±5% Wide supply voltage range 5V to ±15V Wide temperature range −40°C to +125°C Adjustable current limit High capacitive load drive Thermal shutdown error flag Description The LMH6321 is a high speed unity gain buffer that slews at 1800 V/µs and has a small signal bandwidth of 110 MHz while driving a 50Ω load. It can drive ±300 mA continuously and will not oscillate while driving large capacitive loads. The LMH6321 features an adjustable current limit. The current limit is continuously adjustable from 10 mA to 300 ma with a ±5 mA ±5% accuracy. The current limit is set by adjusting an external reference current with a resistor. The current can be easily and instantly adjusted, as needed by connecting the resistor to a DAC to form the reference current. The sourcing and sinking currents share the same current limit. The LMH6321 is available in a space saving 8-pin PSOP or a 7-pin TO-263 power package. The PSOP package features an exposed pad on the bottom of the package to increase its heat sinking capability. The LMH6321 can be used within the feedback loop of an operational amplifier to boost the current output or as a stand alone buffer. Applications Line driver Pin driver Sonar driver Motor control

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

Parameters Values Output Current 300 mA Slew Rate 1800 Volts/usec Channels 1 Channels Buffer Type Fixed Av+1 BW 110 MHz Supply Current Per Channel 10 mA PowerWise Rating 2 90.9 uA/MHz Gain 1 V/V Supply Min 5 Volt Supply Max 30 Volt Offset Voltage max, 25C 15 mV Max Input Bias Current 17000 nA Voltage Noise 2.8 nV/root(Hz) HD 2nd -57 dB HD 3rd -59 dB Special Features Adj Ilimit, Err Flag Gain Bandwidth 110 MHz Function Buffer Temperature Min -40 deg C Temperature Max 125 deg C

Datasheets

Title		Size	Date	Other Language
	LMH6321 300 mA High Speed Buffer with Adjustable Current Limit	590 Kbytes	10-Apr-07	日本語

Application Notes

Title		Size	Date	Other Language
	AN-1461: Application Note 1461 LMH6321 (PSOP and TO-263) Single Open Loop High Speed Buffer Evaluation Boards	6341 Kbytes	27-Nov-06	中文

Other Technical Documents

Title		Type	Date
	Reference Clock Loop Through Application	App Note	2009-01-16

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LMH6321MR/NOPB LMH6321MR RoHS Status	PSOP	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 250 AVNET-EM Worldwide 109 DIGI-KEY Worldwide 491 FARNELL Europe and Asia 196 MOUSER Worldwide 46 NEWARK Americas 82 RS COMPONENTS Worldwide 39 TAYLOR Americas 250	$2.25 each at 1K+ pcs	rail of 95
LMH6321MRX/NOPB LMH6321MRX RoHS Status	PSOP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$2.25 each at 1K+ pcs	reel of 2500
LMH6321TS/NOPB LMH6321TS RoHS Status	TO-263	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 100 FARNELL Europe and Asia 202 MOUSER Worldwide 180 NEWARK Americas 140	$2.25 each at 1K+ pcs	rail of 45
LMH6321TSX/NOPB LMH6321TSX RoHS Status	TO-263	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$2.25 each at 1K+ pcs	reel of 500

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 LMH6321.

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 LMH6321 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LMH6321MR-EVAL/NOPB	Evaluation PCB for High-Speed Single Open-Loop Buffer in the 8-Pin PSOP Package	Full production Lead Free (RoHS)	Distributor Region Qty DIGI-KEY Worldwide 0 MOUSER Worldwide 1	$30.00 each	1
Description: National Semiconductor offers this unpopulated Evaluation Board to aid in the evaluation and testing of high-speed Open-Loop Buffer that are offered in the 8-Pin PSOP package. Resistors, capacitors, or any other surface-mount components can be easily mounted on this board in the desired circuit configuration. The performance can then be evaluated under the test conditions of your choice. Power supplies, analog signal source, and other measurement equipment shall be provided by the user. Features: Accommodates various high-speed Open-Loop Buffer Allows quick and easy evaluation Serves as reference design to aid in high-speed PCB layout Utilizes surface-mount components Evaluation Board User Manual (LMH6321MR-EVAL 8-Pin PSOP Open-Loop Buffer Evaluation Board)

National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

Lead Free product status is available through the search tool located here

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LMH6321MR/NOPB LMH6321MR	72.782 73.003	PSOP	8	3 3	260 260	Detail	Download	spice file	NSXYTT LMH63 21MR
LMH6321MRX/NOPB LMH6321MRX	72.782 73.003	PSOP	8	3 3	260 260	Detail	Download	spice file	NSXYTT LMH63 21MR
LMH6321TS/NOPB LMH6321TS	1608.332 1609.822	TO-263	7	3 3	245 235	Detail	Download	spice file	NSUZXYTTE# LMH6321TS
LMH6321TSX/NOPB LMH6321TSX	1608.332 1609.822	TO-263	7	3 3	245 235	Detail	Download	spice file	NSUZXYTTE# LMH6321TS

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 LMH6321.

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 LMH6321 is located at RoHS Status.

CAD Symbols and Models Download LMH6321 CAD Symbols

Models spice file

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LMH6321MR	VIP III	0	16160	0	0	1302500	3	369587931
LMH6321MRX	VIP III	0	16160	0	0	1302500	3	369587931
LMH6321TS	VIP III	0	16160	0	0	1302500	3	369587931
LMH6321TSX	VIP III	0	16160	0	0	1302500	3	369587931

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 LMH6321.

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 LMH6321 is located at RoHS Status.