ZTX458STOB Equivalent & Substitute Parts

Part Overview

The ZTX458STOB is a Bipolar (BJT) NPN transistor manufactured by Diodes Incorporated, designed for general-purpose switching and amplification applications. This component operates at 400 V collector-emitter breakdown voltage with a maximum collector current of 300 mA and 1 W power dissipation capability. The ZTX458STOB is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. Substitute parts must maintain identical electrical specifications and mechanical compatibility to ensure direct replacement without circuit redesign.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	400	V
Current - Collector (Ic) (Max)	300	mA
Power - Max	1	W
Frequency - Transition	50	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 50mA, 10V	—
Vce Saturation (Max) @ Ib, Ic	500mV @ 6mA, 50mA	—
Current - Collector Cutoff (Max)	100	nA
Operating Temperature Range	-55 to 200	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	E-Line-3, Formed Leads	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the ZTX458STOB is determined by strict equivalence across all critical electrical and mechanical parameters. The following parameters establish the substitution criteria:

Transistor Type: NPN configuration
Voltage Rating: 400 V collector-emitter breakdown voltage
Current Rating: 300 mA maximum collector current
Power Dissipation: 1 W maximum
Frequency Response: 50 MHz transition frequency
DC Current Gain: 100 (minimum) at specified conditions
Saturation Characteristics: 500 mV maximum at specified base and collector currents
Package Compatibility: E-Line-3 with formed leads (TO-92 compatible through-hole mounting)
Compliance: ROHS3 compliant, MSL 1

The ZTX458STZ qualifies as a parametric equivalent substitute. Both parts share identical electrical specifications and mechanical packaging. The primary distinction is product status and packaging format: ZTX458STOB is obsolete with tube packaging, while ZTX458STZ is active with cut tape packaging.

Parameter Comparison

Parameter	ZTX458STOB (Main Part)	ZTX458STZ (Substitute)	Match Status
Transistor Type	NPN	NPN	Identical
Voltage - Collector Emitter Breakdown (Max)	400 V	400 V	Identical
Current - Collector (Ic) (Max)	300 mA	300 mA	Identical
Power - Max	1 W	1 W	Identical
Frequency - Transition	50 MHz	50 MHz	Identical
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 50mA, 10V	100 @ 50mA, 10V	Identical
Vce Saturation (Max) @ Ib, Ic	500mV @ 6mA, 50mA	500mV @ 6mA, 50mA	Identical
Current - Collector Cutoff (Max)	100 nA	100 nA	Identical
Operating Temperature Range	-55 to 200°C (TJ)	-55 to 200°C (TJ)	Identical
Mounting Type	Through Hole	Through Hole	Identical
Package / Case	E-Line-3, Formed Leads	E-Line-3, Formed Leads	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Identical
Product Status	Obsolete	Active	Different

Engineering Selection Recommendations

The ZTX458STZ is the direct substitute for the obsolete ZTX458STOB. Both parts are manufactured by Diodes Incorporated and share the base product number ZTX458, confirming their parametric equivalence.

Selection Basis:

Electrical Equivalence: All electrical parameters are identical, including voltage rating, current capacity, power dissipation, frequency response, and gain characteristics.
Mechanical Compatibility: Both parts use E-Line-3 packaging with formed leads, compatible with standard through-hole PCB layouts designed for TO-92 footprints.
Compliance Status: Both parts maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with modern manufacturing and environmental standards.
Product Availability: ZTX458STZ is active with 4200 pieces in stock, providing reliable supply continuity compared to the obsolete ZTX458STOB.
Packaging Format: ZTX458STZ is supplied in cut tape format, standard for production environments, whereas ZTX458STOB was supplied in tube format.

For new designs and production transitions, ZTX458STZ is the appropriate selection. Existing designs using ZTX458STOB require no circuit modifications for migration to ZTX458STZ.

Frequently Asked Questions (FAQ)

Q: Can ZTX458STZ be used as a direct replacement for ZTX458STOB in existing circuits?

A: Yes. ZTX458STZ is a parametric equivalent with identical electrical specifications and mechanical packaging. No circuit modifications are required.

Q: What is the difference between ZTX458STOB and ZTX458STZ?

A: The primary differences are product status and packaging format. ZTX458STOB is obsolete and supplied in tube packaging. ZTX458STZ is active and supplied in cut tape packaging. All electrical and mechanical parameters are identical.

Q: Are both parts compatible with the same PCB footprint?

A: Yes. Both parts use E-Line-3 packaging with formed leads and through-hole mounting. They are compatible with identical PCB layouts and do not require footprint modifications.

Q: What compliance certifications apply to ZTX458STZ?

A: ZTX458STZ is ROHS3 compliant and carries MSL 1 (Unlimited) moisture sensitivity rating. REACH status is unaffected.

Q: Why is ZTX458STOB listed as obsolete?

A: ZTX458STOB has been discontinued by the manufacturer. ZTX458STZ is the active equivalent part for ongoing production and new designs.

Q: Can ZTX458STZ be used in high-frequency applications?

A: ZTX458STZ operates at 50 MHz transition frequency, suitable for general-purpose switching and amplification applications within this frequency range.

Q: What is the maximum operating temperature for ZTX458STZ?

A: The maximum junction temperature (TJ) is 200°C, with an operating range of -55°C to 200°C.

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