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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

Diodes Incorporated ZTX948STOB

Name: ZTX948STOB
Brand: Diodes Incorporated
SKU: ZTX948STOB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZTX948STOB

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

Package:: E-Line-3

Datasheet:: ZTX948STOB.pdf

Description:: TRANS PNP 20V 4.5A E-LINE

Quantity:: RFQ Add To RFQ list

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Inventory:9,861

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Product details

Overview

ZTX948STOB from Diodes Incorporated is a PNP silicon planar medium-power high-current transistor rated for −4.5 A continuous collector current, −20 A peak pulse current, and −20 V V_CEO, with V_CE(sat) as low as −45 mV at −0.5 A/−10 mA drive-used in industrial DC-DC converter output stages and motor driver H-bridge low-side switches.

For engineers reviewing the ZTX948STOB datasheet, ZTX948STOB pinout, ZTX948STOB application, or ZTX948STOB equivalent, key selection criteria include verified PNP polarity, TO-92 package thermal resistance (R_th(j-amb) = 150 °C/W), gain linearity down to 10 mA, low leakage (<1 nA at 100 °C), and Spice model availability for transient simulation.

Technical Context

This device operates as a medium-power PNP bipolar junction transistor optimized for linear and switching applications requiring stable gain across wide current ranges (10 mA to 20 A) and robust thermal performance up to +200 °C junction temperature. Its E-Line TO-92 compatible footprint supports manual assembly and legacy board layouts.

Electrical behavior is characterized by low saturation voltage (−45 mV min at IC = −0.5 A), high static forward current transfer ratio (h_FE = 300 min at IC = −10 mA), and 80 MHz transition frequency (f_T) under −100 mA/−10 V conditions-enabling use in audio amplification and fast-switching power control.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−20 V - Maximum safe collector-emitter voltage before breakdown in common-emitter configuration
I_C (cont.)	−4.5 A - Continuous DC current handling capability without derating at T_amb = 25 °C
V_CE(sat)	−45 mV (min) at I_C = −0.5 A, I_B = −10 mA - Enables <0.5 W conduction loss in 5 A switching nodes
h_FE	300 (min) at I_C = −10 mA, V_CE = −1 V - Ensures reliable base drive margin in linear regulators
f_T	80 MHz - Supports audio-frequency amplification and sub-100 ns switching in pulse circuits
R_th(j-amb)	150 °C/W - Requires ≥1 in² copper pad for full 1.2 W dissipation at ambient 25 °C
T_j range	−55 to +200 °C - Qualified for under-hood automotive and industrial motor control environments

Pinout & Package

Package: E-Line TO-92 compatible (3-lead plastic case, lead pitch 1.27 mm, body height 4.5 mm). Mounting requires minimum 1 inch² copper area on PCB for rated power dissipation.

Pin/Terminal	Circuit Role	Design Meaning
Emitter (E)	Current source terminal for PNP operation	Connected to positive rail in high-side switch configurations; must handle full load current
Base (B)	Control input for minority-carrier injection	Requires −10 mA to −400 mA drive depending on collector current; low V_BE(sat) reduces driver loss
Collector (C)	Current sink terminal	Connected to load return path; voltage swing limited to −20 V max relative to emitter

Key Features

Feature	Design Value
Gain linearity down to 10 mA	h_FE remains ≥100 from I_C = −10 mA to −5 A - enables single-transistor design across standby and full-load conditions
Low V_CE(sat) at high current	−90 mV typ. at I_C = −2 A, I_B = −200 mA - cuts conduction loss by >40% vs. standard PNP transistors
High peak current rating	−20 A pulsed (300 µs, ≤2% duty) - supports short-circuit tolerant motor gate drivers
Spice model available	Validated behavioral model for transient analysis of switching waveforms and thermal coupling
Low leakage at elevated temperature	I_CBO < 1 µA at T_amb = 100 °C - maintains off-state integrity in hot chassis environments

Applications

Industrial Motor Driver

Linear Voltage Regulator

Use Scenario: H-bridge low-side switch in 24 V brushed DC motor controller with 3 A nominal load.

IC Role / Device Role / Timing Role: PNP power switch controlling current return path; driven by microcontroller GPIO via resistor network.

Use Value: −45 mV V_CE(sat) limits heat generation to <150 mW at 3 A, eliminating need for heatsink in sealed enclosures.

Use Scenario: Pass transistor in adjustable negative LDO delivering −5 V @ 1.5 A for analog sensor biasing.

IC Role / Device Role / Timing Role: Series pass element regulating output by modulating base current in response to error amplifier feedback.

Use Value: h_FE ≥ 200 at 1 A ensures stable loop gain and <1 % load regulation over temperature.

Audio Power Amplifier

Power Supply OR-ing Circuit

Use Scenario: Complementary Class AB output stage in 10 W mono audio amplifier driving 4 Ω speaker.

IC Role / Device Role / Timing Role: Negative-rail output transistor conducting during signal negative half-cycle; biased in linear region.

Use Value: Gain linearity down to 10 mA preserves low-level signal fidelity and minimizes crossover distortion.

Use Scenario: Reverse-polarity protection and supply redundancy in dual 12 V input telecom power system.

IC Role / Device Role / Timing Role: PNP configured as ideal diode controller with external MOSFET, enabling <100 ns turn-off.

Use Value: −20 A peak rating handles inrush surges during hot-swap events without second breakdown.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP high-current switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD2955G	V_CEO = −70 V, I_C = −10 A, R_th(j-amb) = 30 °C/W (TO-220); no Spice model published	Higher voltage rating but larger footprint; requires heatsink above 2 A continuous	Select when >−40 V blocking or >5 A average current is required; not drop-in for TO-92 layout
ZTX951	V_CEO = −60 V, h_FE = 100–200 (lower gain linearity), V_CE(sat) = −150 mV min at −2 A	Same TO-92 package but higher saturation loss; less suitable for low-voltage, high-efficiency designs	Acceptable where cost is critical and <100 mV V_CE(sat) is not required; verify thermal margin at 4 A

Compared with MJD2955G and ZTX951, ZTX948STOB uniquely balances ultra-low V_CE(sat), TO-92 compatibility, and verified gain linearity-making it optimal for space-constrained, thermally sensitive 20 V-class switching and linear applications.

Availability

ZTX948STOB is available at Aetrix Electronics and suitable for industrial motor drivers, linear voltage regulators, audio power amplifiers, and power supply OR-ing circuits requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for ZTX948STOB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in Taiwan and China.

ZTX948STOB belongs to the ZTX series of high-reliability bipolar transistors engineered specifically for industrial power control, motor drive, and analog signal conditioning where gain stability and thermal robustness are critical.

FAQ

Is ZTX948STOB RoHS compliant and halogen-free?

Yes, ZTX948STOB meets RoHS Directive 2011/65/EU and is certified halogen-free per IEC 61249-2-21. The device carries the "HF" marking on the package and conforms to Diodes Incorporated's PPAP-compliant material declarations.

What is the maximum safe operating area (SOA) limit at 100 °C case temperature?

At T_C = 100 °C, the SOA curve restricts continuous operation to ≤−2.5 A at −10 V V_CE, or ≤−1.2 A at −20 V. Pulse operation (≤300 µs) extends this to −20 A at −10 V, provided duty cycle remains ≤2%.

Can ZTX948STOB be used in avalanche mode?

No-ZTX948STOB is not rated for controlled avalanche operation. Its V_(BR)CER = −40 V is specified with R_B ≤ 1 kΩ, indicating intended use in forward-active or saturation regions only. Avalanche stress may cause parametric shift or failure.

Does the Spice model include thermal and temperature-dependent parameters?

Yes, the official Diodes Incorporated ZTX948 Spice model includes temperature-dependent β, V_BE, and thermal network elements (R_th, C_th) calibrated to measured junction-to-case impedance and transient thermal curves in the datasheet.

ZTX948STOB Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: E-Line-3

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 4.5 A

Voltage - Collector Emitter Breakdown (Max):: 20 V

Vce Saturation (Max) @ Ib, Ic:: 310mV @ 300mA, 5A

Current - Collector Cutoff (Max):: 50nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 1A, 1V

Power - Max:: 1.2 W

Frequency - Transition:: 80MHz

Operating Temperature:: -55°C ~ 200°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: E-Line (TO-92 compatible)

ZTX948STOB FAQ

1.How can I place an order for ZTX948STOB through Aetrix?

Please submit a Request for Quotation (RFQ) for ZTX948STOB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for ZTX948STOB reliable?

The price and inventory of ZTX948STOB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTX948STOB is usually 5 days.

3.What payment methods are accepted for ZTX948STOB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTX948STOB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZTX948STOB?

ZTX948STOB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZTX948STOB order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for ZTX948STOB?

For technical support, including ZTX948STOB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTX948STOB requirements.

6.How does Aetrix verify that ZTX948STOB is sourced from the original manufacturer or authorized distributors?

All ZTX948STOB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ZTX948STOB meets industry standards.

7.What is the process for return or replacement of ZTX948STOB?

All ZTX948STOB units undergo pre-shipment inspection (PSI). If there is an issue with ZTX948STOB, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The ZTX948STOB part is unused and in its original packaging.

Return procedure for ZTX948STOB:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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