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

Diodes Incorporated ZTX790ASTOB

Name: ZTX790ASTOB
Brand: Diodes Incorporated
SKU: ZTX790ASTOB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZTX790ASTOB

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

Package:: E-Line-3, Formed Leads

Datasheet:: ZTX790ASTOB.pdf

Description:: TRANS PNP 40V 2A E-LINE

Quantity:: RFQ Add To RFQ list

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Inventory:3,929

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Product details

Overview

ZTX790ASTOB from Diodes Incorporated is a PNP silicon planar medium-power high-gain bipolar junction transistor (BJT) designed for switching and linear amplification in low-voltage, moderate-current applications. It features V_CEO = –40 V, h_FE = 200 at I_C = –1 A, V_CE(sat) = –0.45 V (typ.) at I_C = –1 A / I_B = –10 mA, and f_T = 100 MHz - enabling use in siren drivers, Darlington pairs, and battery-powered motor control stages.

For engineers reviewing the ZTX790ASTOB datasheet, ZTX790ASTOB pinout, ZTX790ASTOB application, or ZTX790ASTOB equivalent, key selection criteria include verified PNP polarity, TO-92-compatible E-Line package thermal performance (R_th(j-amb) = 116 °C/W on 1-in² PCB copper), saturation voltage under pulsed load, and gain linearity across –10 mA to –2 A collector current range.

Technical Context

This BJT operates as a medium-power PNP switch with robust safe operating area (SOA) up to 1.5 W continuous dissipation on standard PCB mounting. Its high DC current gain (h_FE ≥ 150 at I_C = –2 A) supports low-base-drive designs in discrete power stages.

The device exhibits fast switching (t_on = 35 ns, t_off = 600 ns) under pulsed conditions (300 µs width, ≤2% duty cycle), with C_ibo = 225 pF and C_obo = 24 pF enabling stable operation in audio-frequency and low-MHz switching circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	–40 V - Maximum allowable collector-emitter voltage before breakdown in common-emitter configuration.
h_FE @ I_C = –1 A	200 - Sufficient current gain to drive 1 A load with only 5 mA base current, reducing driver-stage complexity.
V_CE(sat) @ I_C = –1 A	–0.45 V (typ.) - Low conduction loss improves efficiency in battery-powered motor/siren drivers.
f_T	100 MHz - Supports reliable operation up to audio and low-RF frequencies without gain roll-off.
P_tot @ T_amb = 25°C	1.5 W - Practical power limit on standard PCB; derates 5.7 mW/°C above 25°C ambient.
R_th(j-amb)	116 °C/W - Thermal resistance measured with 1-inch² copper pad; defines junction temperature rise under steady-state load.

Pinout & Package

Package: TO-92-compatible E-Line (3-lead plastic case), lead-forming option STOB (straight leads, bulk packaging). Mounting requires minimum 1-inch² copper area for rated power dissipation.

Pin/Terminal	Circuit Role	Design Meaning
E (Emitter)	Current source terminal for PNP operation	Connected to higher potential rail; carries full load current; must be routed with low-inductance path in switching apps.
B (Base)	Control input for minority-carrier injection	Requires negative bias relative to emitter to turn on; base resistor sizing critical for saturation at target I_C.
C (Collector)	Current sink terminal	Connected to load return path; voltage swing limited to –40 V max; thermal interface to PCB copper essential.

Key Features

Feature	Design Value
High DC current gain	h_FE ≥ 150 at I_C = –2 A enables compact base-drive circuitry in high-current switches.
Low V_CE(sat)	–0.25 V (min.) at I_C = –500 mA reduces conduction loss and self-heating in portable systems.
Fast switching speed	t_on/t_off = 35/600 ns allows use in 10–100 kHz PWM motor control without excessive switching loss.
Wide temperature range	Rated for T_j = –55°C to +200°C supports operation in automotive engine-bay or industrial motor-control enclosures.

Applications

Siren Driver Circuit

Darlington Pair Input Stage

Use Scenario: High-current audio-frequency oscillator driving piezoelectric or electromagnetic sirens in security alarms.

IC Role / Device Role / Timing Role: PNP switch modulating load current at 1–3 kHz; handles peak currents up to 2 A during tone bursts.

Use Value: Low V_CE(sat) minimizes heat generation during sustained 1-A output, extending battery life in standalone units.

Use Scenario: First-stage amplifier in complementary Darlington output for 12 V DC motor H-bridge.

IC Role / Device Role / Timing Role: High-h_FE PNP pre-driver providing base current to main NPN power transistor.

Use Value: h_FE ≥ 200 at I_C = –1 A ensures full saturation of output stage with minimal microcontroller GPIO current.

Battery-Powered Motor Control

Low-Voltage Linear Regulator Pass Element

Use Scenario: Single-transistor PWM-controlled DC fan or small gearmotor in handheld medical devices.

IC Role / Device Role / Timing Role: Medium-power switching element in low-side or high-side configuration (with level shift).

Use Value: 100 MHz f_T and fast t_off support clean 20 kHz PWM without shoot-through risk in compact layouts.

Use Scenario: Series pass transistor in adjustable 5–12 V linear regulator for noise-sensitive analog subsystems.

IC Role / Device Role / Timing Role: Voltage-controlled current source regulating output via feedback loop.

Use Value: Stable h_FE over –10 mA to –1 A enables predictable loop gain and thermal foldback response.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP medium-power transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD2955T4G	TO-220 package, higher P_tot (115 W), lower f_T (100 kHz), V_CEO = –60 V	Designed for heatsink-mounted high-power linear/switching; unsuitable for TO-92 footprint replacement	Select when >2 A continuous current or forced-air cooling is required; not drop-in for PCB space-constrained designs.
ZTX753STOB	Same TO-92 STOB package, V_CEO = –60 V, h_FE = 100 @ I_C = –1 A, V_CE(sat) = –0.5 V (typ.)	Higher voltage rating but lower gain and higher saturation voltage than ZTX790A	Choose for higher breakdown margin where gain and efficiency are secondary to ruggedness.

Compared with MJD2955T4G and ZTX753STOB, ZTX790ASTOB uniquely balances TO-92 mountability, 100 MHz bandwidth, and 200 h_FE at 1 A - making it optimal for compact, battery-efficient, medium-speed switching where thermal mass is limited.

Availability

ZTX790ASTOB is available at Aetrix Electronics and suitable for siren driver circuits, Darlington pair input stages, and battery-powered motor control requiring stable component supply and consistent parametric performance across production lots.

Supply support for ZTX790ASTOB 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 and manufacturing operations across Asia and the Americas.

ZTX790ASTOB belongs to the ZTX series of general-purpose bipolar transistors engineered for cost-effective, high-reliability discrete power switching and amplification in consumer, industrial, and automotive auxiliary systems.

FAQ

Is ZTX790ASTOB RoHS compliant and halogen-free?

Yes, ZTX790ASTOB meets RoHS Directive 2011/65/EU and is certified halogen-free per IEC 61249-2-21. The device uses lead-free matte tin plating on leads and complies with JEDEC J-STD-020 moisture sensitivity level (MSL) 1 for unlimited floor life at ≤30°C/60% RH.

What is the maximum safe continuous collector current at 70°C ambient?

At T_amb = 70°C, derating from 25°C starts at 5.7 mW/°C. With 1.5 W max at 25°C, allowable P_tot = 1.5 W – (45 × 5.7 mW) = 1.24 W. Using V_CE(sat) ≈ –0.45 V, max continuous I_C ≈ √(P_tot/R_CE(sat)) ≈ 1.2 A (assuming R_CE(sat) ≈ 0.37 Ω derived from V/I).

Can ZTX790ASTOB be used in avalanche mode?

No - ZTX790ASTOB is not rated or characterized for controlled avalanche operation. Its absolute maximum V_CBO = –50 V and SOA curves do not specify energy limits for repetitive avalanche; use only within linear or switching Safe Operating Area boundaries defined in the datasheet.

Does the STOB suffix indicate tape-and-reel packaging?

No - STOB denotes straight leads and bulk packaging (loose parts in tube or bag). Tape-and-reel variants use suffixes like STOR or STR; for example, ZTX790ASTOR is the 2,000-piece 8 mm tape-and-reel version compatible with automated placement equipment.

ZTX790ASTOB Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: E-Line-3, Formed Leads

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 2 A

Voltage - Collector Emitter Breakdown (Max):: 40 V

Vce Saturation (Max) @ Ib, Ic:: 750mV @ 50mA, 2A

Current - Collector Cutoff (Max):: 100nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 300 @ 10mA, 2V

Power - Max:: 1 W

Frequency - Transition:: 100MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

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

ZTX790ASTOB FAQ

1.How can I place an order for ZTX790ASTOB through Aetrix?

Please submit a Request for Quotation (RFQ) for ZTX790ASTOB 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 ZTX790ASTOB reliable?

The price and inventory of ZTX790ASTOB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTX790ASTOB is usually 5 days.

3.What payment methods are accepted for ZTX790ASTOB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTX790ASTOB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZTX790ASTOB?

ZTX790ASTOB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZTX790ASTOB 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 ZTX790ASTOB?

For technical support, including ZTX790ASTOB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTX790ASTOB requirements.

6.How does Aetrix verify that ZTX790ASTOB is sourced from the original manufacturer or authorized distributors?

All ZTX790ASTOB 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 ZTX790ASTOB meets industry standards.

7.What is the process for return or replacement of ZTX790ASTOB?

All ZTX790ASTOB units undergo pre-shipment inspection (PSI). If there is an issue with ZTX790ASTOB, 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 ZTX790ASTOB part is unused and in its original packaging.

Return procedure for ZTX790ASTOB:

1.Submit a request within 90 days.

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

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