TIP49 Equivalent & Substitute Parts

Part Overview

The TIP49 is a bipolar NPN transistor manufactured by STMicroelectronics, rated for 350 V collector-emitter breakdown voltage and 1 A maximum collector current. This device is designed for through-hole mounting in TO-220-3 package configuration and operates at frequencies up to 10 MHz with a maximum power dissipation of 2 W. The TIP49 is classified as obsolete, necessitating identification of equivalent substitute components that maintain electrical and mechanical compatibility for existing applications and new designs requiring this performance class.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	350	V
Current - Collector (Ic) (Max)	1	A
Power - Max	2	W
Frequency - Transition	10	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	30 @ 300mA, 10V	—
Vce Saturation (Max) @ Ib, Ic	1V @ 200mA, 1A	—
Package / Case	TO-220-3	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution of the TIP49 is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

Transistor polarity: NPN
Voltage rating: 350 V collector-emitter breakdown minimum
Current rating: 1 A collector current minimum
Package type: TO-220-3 through-hole configuration
DC current gain: 30 (minimum) at specified bias conditions
Frequency capability: 10 MHz transition frequency minimum

The NTE Electronics TIP49 substitute maintains all critical electrical specifications and package compatibility. Variations in maximum power dissipation and operating temperature range do not affect functional substitution when the application operates within the original design envelope.

Parameter Comparison

Parameter	STMicroelectronics TIP49	NTE Electronics TIP49	Match Status
Transistor Type	NPN	NPN	Equivalent
Voltage - Collector Emitter Breakdown (Max)	350 V	350 V	Equivalent
Current - Collector (Ic) (Max)	1 A	1 A	Equivalent
Vce Saturation (Max) @ Ib, Ic	1V @ 200mA, 1A	1V @ 200mA, 2A	Compatible
Current - Collector Cutoff (Max)	1 mA	1 mA	Equivalent
DC Current Gain (hFE) (Min) @ Ic, Vce	30 @ 300mA, 10V	30 @ 300mA, 10V	Equivalent
Power - Max	2 W	40 W	Substitute Rated Higher
Frequency - Transition	10 MHz	10 MHz	Equivalent
Package / Case	TO-220-3	TO-220-3	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Operating Temperature	150°C (TJ)	-65°C ~ 150°C (TJ)	Substitute Range Wider

Engineering Selection Recommendations

The NTE Electronics TIP49 serves as a direct functional substitute for the obsolete STMicroelectronics TIP49. Both devices share identical electrical specifications for voltage, current, gain, and frequency performance. The NTE variant provides enhanced thermal capability (40 W versus 2 W maximum power dissipation) and extended operating temperature range, offering superior performance margins in thermal management scenarios.

The STMicroelectronics TIP49 carries RoHS3 compliance and REACH unaffected status. The NTE Electronics TIP49 is RoHS non-compliant. Selection between these substitutes depends on regulatory requirements specific to the application and end-use market. For applications requiring RoHS compliance, alternative NPN transistors meeting the specified electrical parameters and RoHS certification status should be evaluated.

Both devices are classified as through-hole components in TO-220-3 package configuration, ensuring mechanical and thermal interface compatibility with existing printed circuit board designs.

Frequently Asked Questions (FAQ)

Q: Can the NTE Electronics TIP49 directly replace the STMicroelectronics TIP49 in existing circuit designs?

A: Yes. Both devices are NPN transistors with identical voltage (350 V), current (1 A), gain (30 minimum), and frequency (10 MHz) specifications. The TO-220-3 package configuration is identical, ensuring pin-compatible mounting and thermal interface compatibility.

Q: What is the significance of the higher power rating in the NTE Electronics substitute?

A: The NTE variant is rated for 40 W maximum power dissipation compared to 2 W for the original STMicroelectronics device. This higher rating provides additional thermal margin and allows operation in applications with greater power dissipation requirements, though it does not alter the electrical performance characteristics at the original design operating point.

Q: Are there compliance differences between the two TIP49 variants?

A: Yes. The STMicroelectronics TIP49 is RoHS3 compliant and REACH unaffected. The NTE Electronics TIP49 is RoHS non-compliant. Applications subject to RoHS regulatory requirements must use the STMicroelectronics variant or identify alternative components with appropriate compliance certification.

Q: Does the extended operating temperature range of the NTE variant affect substitution suitability?

A: No. The NTE Electronics TIP49 operating range (-65°C to 150°C) encompasses the STMicroelectronics specification (150°C maximum). The wider temperature range represents an enhancement that does not compromise compatibility for applications operating within the original design temperature envelope.

Q: What package considerations apply to both TIP49 variants?

A: Both devices use TO-220-3 through-hole packaging. This configuration requires identical printed circuit board footprints, lead spacing, and mounting hardware. No mechanical redesign is necessary when substituting between these variants.

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