ZTX953STOB Equivalent & Substitute Parts Reference

Part Overview

The ZTX953STOB (Diodes Incorporated) is a PNP bipolar junction transistor (BJT) with a collector-emitter voltage of 100 V, a maximum collector current of 3.5 A, and a frequency transition value of 125 MHz. The device is suitable for through-hole mounting with an E-Line (TO-92 compatible) package, and supports operating temperatures from -55°C to 200°C. Power dissipation is rated at 1.2 W. This part is classified as obsolete, necessitating the identification of direct alternative models to ensure continuity in both production lines and ongoing component maintenance.

Key Parameters

Parameter	ZTX953STOB
Transistor Type	PNP
Current - Collector (Ic) (Max)	3.5 A
Voltage - Collector Emitter Breakdown (Max)	100 V
Vce Saturation (Max) @ Ib, Ic	330mV @ 400mA, 4A
Current - Collector Cutoff (Max)	50nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 1A, 1V
Power - Max	1.2 W
Frequency - Transition	125MHz
Operating Temperature	-55°C ~ 200°C (TJ)
Mounting Type	Through Hole
Package / Case	E-Line-3, Formed Leads
Supplier Device Package	E-Line (TO-92 compatible)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected
ECCN	EAR99

Substitute Part Grouping Explanation

Substitute transistors in the Bipolar (BJT) category are grouped strictly based on the following parameters: transistor type, maximum collector current, maximum collector-emitter voltage, Vce saturation at given test conditions, maximum collector cutoff current, minimum DC current gain at specific Ic and Vce conditions, power dissipation, frequency transition, operating temperature range, mounting type, and package details. Compliance information such as RoHS status and MSL is also considered. The substitute ZTX953STZ matches the ZTX953STOB in all provided electrical, mechanical, and compliance parameters, with the only difference being the packaging format.

Parameter Comparison

Parameter	ZTX953STOB	ZTX953STZ
Manufacturer	Diodes Incorporated	Diodes Incorporated
Transistor Type	PNP	PNP
Current - Collector (Ic) (Max)	3.5 A	3.5 A
Voltage - Collector Emitter Breakdown (Max)	100 V	100 V
Vce Saturation (Max) @ Ib, Ic	330mV @ 400mA, 4A	330mV @ 400mA, 4A
Current - Collector Cutoff (Max)	50nA (ICBO)	50nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 1A, 1V	100 @ 1A, 1V
Power - Max	1.2 W	1.2 W
Frequency - Transition	125MHz	125MHz
Operating Temperature	-55°C ~ 200°C (TJ)	-55°C ~ 200°C (TJ)
Mounting Type	Through Hole	Through Hole
Package / Case	E-Line-3, Formed Leads	E-Line-3, Formed Leads
Supplier Device Package	E-Line (TO-92 compatible)	E-Line (TO-92 compatible)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected
ECCN	EAR99	EAR99
Product Status	Obsolete	Active

Engineering Selection Recommendations

The ZTX953STOB is classified as obsolete. The ZTX953STZ, also manufactured by Diodes Incorporated, is marked as active and matches all listed electrical, mechanical, and compliance parameters, including RoHS3, REACH, and MSL ratings, as well as ECCN and package form factor. Selection can be based strictly on the provided compliance and status information without additional criteria.

Frequently Asked Questions (FAQ)

Q1: What parameters are required for substitute selection with ZTX953STOB in the Transistors, Bipolar (BJT) category?
A1: Substitute selection requires matching transistor type, collector current (Ic), collector-emitter voltage (Vce), Vce(sat) at specified conditions, collector cutoff current, DC current gain (hFE) at test points, power dissipation, frequency transition, operating temperature range, mounting type, and package. Compliance statuses (RoHS, REACH, MSL) and ECCN are also required.

Q2: Is the ZTX953STZ identical to ZTX953STOB aside from packaging and status?
A2: Yes. All provided technical and compliance details are identical except that ZTX953STOB is obsolete and ZTX953STZ is active and supplied in Tape & Box packaging.

Q3: Does the package type impact interchangeability between ZTX953STOB and ZTX953STZ?
A3: Both parts utilize the E-Line (TO-92 compatible) through-hole package with formed leads, matching all specified package parameters.

Q4: Are RoHS3 and REACH compliance requirements maintained in the proposed substitute?
A4: Both ZTX953STOB and ZTX953STZ are ROHS3 Compliant and REACH Unaffected as per provided data.

Q5: Do differences in inventory quantity impact substitution or technical criteria?
A5: Inventory levels do not factor into technical substitution or compatibility within the given parameters. Only electrical, mechanical, and compliance parameters determine equivalence.

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