The key factors in these equations

diode where heat is generated

under high current conditions;

of the Schottky die; and

or the package thermal resistance.

diodes is typically 0.7

Ω and is the

lowest of any Schottky diode

available from Agilent. Chip

thermal resistance is typically

40

°C/W; the thermal resistance of

the iron-alloy-leadframe, SOT-23

package is typically 460

°C/W; and

the thermal resistance of the

copper-leadframe, SOT-323

package is typically 110

°C/W. The

impact of package thermal

Part Number Ordering Information

Part Number

No. of Devices

Container

HSMS-2700-BLK

100

Antistatic Bag

HSMS-2700-TR1

3,000

7" Reel

HSMS-2700-TR2

10,000

13" Reel

HSMS-2702-BLK

100

Antistatic Bag

HSMS-2702-TR1

3,000

7" Reel

HSMS-2702-TR2

10,000

13" Reel

HSMS-270B-BLK

100

Antistatic Bag

HSMS-270B-TR1

3,000

7" Reel

HSMS-270B-TR2

10,000

13" Reel

HSMS-270C-BLK

100

Antistatic Bag

HSMS-270C-TR1

3,000

7" Reel

HSMS-270C-TR2

10,000

13" Reel

resistance on the current handling

capability of these diodes can be

seen in Figures 3 and 4. Here the

computed values of junction

temperature vs. forward current

are shown for three values of

ambient temperature. The SOT-

323 products, with their copper

leadframes, can safely handle

almost twice the current of the

larger SOT-23 diodes. Note that

the term “ambient temperature”

refers to the temperature of the

diode’s leads, not the air around

the circuit board. It can be seen

that the HSMS-270B and

HSMS-270C products in the

SOT-323 package will safely

withstand a steady-state forward

current of 550 mA when the

diode’s terminals are maintained

at 75

°C.

For pulsed currents and transient

current spikes of less than one

microsecond in duration, the

junction does not have time to

reach thermal steady state.

Moreover, the diode junction may

be taken to temperatures higher

than 150

°C for short time-periods

without impacting device MTTF.

Because of these factors, higher

currents can be safely handled.

The HSMS-270x family has the

highest current handling capabil-

ity of any Agilent diode.

www.agilent.com/semiconductors

For product information and a complete list of

distributors, please go to our web site.

For technical assistance call:

Americas/Canada: +1 (800) 235-0312 or

(916) 788-6763

Europe: +49 (0) 6441 92460

China: 10800 650 0017

Hong Kong: (65) 6756 2394

India, Australia, New Zealand: (65) 6755 1939

Japan: (+81 3) 3335-8152(Domestic/International), or

0120-61-1280(Domestic Only)

Korea: (65) 6755 1989

Singapore, Malaysia, Vietnam, Thailand, Philippines,

Indonesia: (65) 6755 2044

Taiwan: (65) 6755 1843

Data subject to change.

Copyright © 2004 Agilent Technologies, Inc.

Obsoletes 5968-2351E

March 24, 2004

5989-0473EN

Note

: For lead-free option, the part number will have the character "G"

at the end, eg. HSMS-270x-TR2G for a 10,000 lead-free reel.