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

Diodes Incorporated ZTX790ASTZ

Name: ZTX790ASTZ
Brand: Diodes Incorporated
SKU: ZTX790ASTZ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZTX790ASTZ

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

Package:: E-Line-3, Formed Leads

Datasheet:: ZTX790ASTZ.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:3,177

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Product details

Overview

ZTX790ASTZ 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 circuits. 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 pair stages, and battery-powered motor control.

For engineers reviewing the ZTX790ASTZ datasheet, ZTX790ASTZ pinout, ZTX790ASTZ application, or ZTX790ASTZ equivalent, key selection criteria include verified PNP saturation voltage under 1 A load, thermal resistance of 116 °C/W (PCB-mounted), gain consistency across –10 mA to –2 A collector current, and TO-92-compatible E-Line package compatibility with legacy through-hole layouts.

Technical Context

This BJT operates as a medium-power PNP switch or amplifier with a maximum continuous collector current of –2 A and pulsed capability up to –6 A. Its low V_CE(sat) (–0.25 V min at I_C = –500 mA) and high h_FE (up to 800 at I_C = –10 mA) support efficient current sourcing in grounded-emitter configurations.

The device exhibits f_T = 100 MHz at I_C = –50 mA / V_CE = –5 V, with C_ibo = 225 pF and C_obo = 24 pF, indicating suitability for audio-frequency switching and fast-turnoff applications like alarm tone generation and DC motor commutation control.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	–40 V: Maximum safe collector-emitter reverse bias before breakdown in common-emitter configuration.
h_FE @ I_C = –1 A	200: Confirmed DC current gain enabling 10 mA base drive to switch 1 A collector load reliably.
V_CE(sat) @ I_C = –1 A	–0.45 V (typ.): Low saturation voltage reduces conduction loss and heat generation in power-switching nodes.
f_T	100 MHz: Transition frequency supports stable operation up to audio-band switching (e.g., 20 kHz PWM motor control).
P_tot @ T_amb = 25°C	1.5 W: Practical PCB-mount power dissipation limit; derates 5.7 mW/°C above 25°C ambient.
R_th(j–amb) (PCB)	116 °C/W: Thermal resistance when mounted on ≥1 in² copper area - critical for thermal design in enclosed battery-powered enclosures.

Pinout & Package

Package: TO-92 compatible E-Line (3-lead, straight lead form, epoxy molded). Pin identification follows standard BJT orientation: viewed from flat side with leads down, left-to-right is Emitter (E), Base (B), Collector (C).

Pin/Terminal	Circuit Role	Design Meaning
E (Emitter)	Current source terminal in PNP operation	Connected to positive rail in high-side switch; sets reference for base bias network.
B (Base)	Control input for minority-carrier injection	Requires negative-going drive relative to emitter; typical R_B = 1–10 kΩ for 1 A switching.
C (Collector)	Current sink terminal	Connected to load (e.g., motor coil or siren transducer); must withstand –40 V transient spikes.

Key Features

Feature	Design Value
High DC current gain	h_FE ≥ 200 at I_C = –1 A ensures minimal base drive power in battery-sensitive designs.
Low saturation voltage	V_CE(sat) ≤ –0.45 V (typ.) at rated current reduces I²R losses and improves efficiency in portable motor drivers.
Robust thermal performance	R_th(j–amb) = 116 °C/W on standard PCB enables operation up to +100°C ambient without heatsink.
Wide temperature range	Rated for –55°C to +200°C junction operation - validated for automotive under-hood and industrial motor-control environments.

Applications

Siren Tone Generator

Darlington Pair Driver

Use Scenario: Generates audible alarm tones using astable multivibrator or PWM-driven piezo/speaker load in security systems.

IC Role / Device Role / Timing Role: PNP switch controlling current path through tone-producing element; operates in saturated switching mode with <35 ns turn-on.

Use Value: Low V_CE(sat) minimizes voltage drop across transistor during active tone burst, preserving battery voltage for sustained output.

Use Scenario: Serves as driver stage for high-current NPN Darlington output transistor in power supply or lamp dimmer circuits.

IC Role / Device Role / Timing Role: Provides high-gain, low-loss current amplification to reduce base drive burden on upstream logic or microcontroller.

Use Value: h_FE ≥ 200 at –1 A allows single GPIO pin to initiate full-load switching without external buffer.

Battery-Powered Motor Control

Low-Voltage Linear Amplifier

Use Scenario: Controls brushed DC motor direction/speed in handheld tools or portable instrumentation using H-bridge half-bridge topology.

IC Role / Device Role / Timing Role: High-side PNP switch in complementary emitter-follower configuration; handles peak currents up to –6 A in pulse mode.

Use Value: 1.5 W power rating and 116 °C/W thermal resistance enable continuous 500 mA motor drive without thermal shutdown in compact enclosures.

Use Scenario: Amplifies low-level sensor signals (e.g., thermocouple, strain gauge) in analog front-end stages of data loggers.

IC Role / Device Role / Timing Role: Common-emitter linear amplifier biased at I_C = –10 mA; leverages high h_FE stability over temperature for gain accuracy.

Use Value: Gain variation <±15% from –55°C to +100°C supports reliable signal conditioning in unregulated environmental conditions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MPSA92	V_CEO = –30 V (lower), h_FE = 50–250 (wider spread), P_tot = 0.625 W (lower)	Limited to <500 mA continuous loads; unsuitable for 1 A motor drivers	Select only for low-power signal switching where voltage margin >10 V is available.
ZTX753	V_CEO = –60 V (higher), h_FE = 100–300 (lower min), V_CE(sat) = –0.55 V (higher)	Better voltage headroom but higher conduction loss; less efficient in battery-critical apps	Prefer when system transients exceed –40 V or when higher breakdown margin is mandatory.

Compared with MPSA92 and ZTX753, ZTX790ASTZ uniquely balances 1 A current capability, –40 V rating, and sub-0.5 V saturation in a TO-92 package - making it optimal for cost-sensitive, space-constrained 12 V motor and alarm applications requiring predictable gain and thermal behavior.

Availability

ZTX790ASTZ is available at Aetrix Electronics and suitable for siren tone generators, Darlington pair drivers, and battery-powered motor control circuits requiring stable component supply, long-term obsolescence management, and consistent parametric performance across production batches.

Supply support for ZTX790ASTZ 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, specializing in high-reliability, high-efficiency components for industrial, computing, and consumer markets.

ZTX790ASTZ belongs to Diodes' ZTX series of high-gain, medium-power BJTs engineered for robust switching and amplification in cost-sensitive, thermally constrained applications such as portable alarms and motorized peripherals.

FAQ

What is the maximum continuous collector current for ZTX790ASTZ?

The maximum continuous collector current is –2 A at T_amb = 25°C with adequate PCB copper area (≥1 in²). At elevated ambient temperatures, derating applies: power dissipation decreases by 5.7 mW/°C above 25°C, limiting usable current in enclosed or high-temperature environments.

Can ZTX790ASTZ be used in surface-mount designs?

No - ZTX790ASTZ uses a through-hole TO-92 compatible E-Line package with straight leads. It is not designed for SMT reflow or pick-and-place; no official SMD variant (e.g., SOT-23 or SOT-89) exists in the ZTX790A family per Diodes' documentation.

What is the recommended base resistor value for switching a 1 A load?

For reliable saturation at I_C = –1 A, use I_B ≥ –10 mA (h_FE = 100 minimum). With V_BE(sat) ≈ –1.0 V and typical drive voltage of –5 V, R_B = (–5 V + 1.0 V) / 10 mA = 400 Ω - standard value 390 Ω provides sufficient margin.

Does ZTX790ASTZ have built-in ESD protection?

No - ZTX790ASTZ is an unprotected bipolar transistor. External ESD protection (e.g., series resistors, TVS diodes on base/emitter) is required in handling and circuit layout, especially in battery-powered systems exposed to human contact or cable disconnection events.

ZTX790ASTZ Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

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

Packaging:: Tape & Box (TB)

Product Status:: Active

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)

ZTX790ASTZ FAQ

1.How can I place an order for ZTX790ASTZ through Aetrix?

Please submit a Request for Quotation (RFQ) for ZTX790ASTZ 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 ZTX790ASTZ reliable?

The price and inventory of ZTX790ASTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTX790ASTZ is usually 5 days.

3.What payment methods are accepted for ZTX790ASTZ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTX790ASTZ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZTX790ASTZ?

ZTX790ASTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZTX790ASTZ 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 ZTX790ASTZ?

For technical support, including ZTX790ASTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTX790ASTZ requirements.

6.How does Aetrix verify that ZTX790ASTZ is sourced from the original manufacturer or authorized distributors?

All ZTX790ASTZ 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 ZTX790ASTZ meets industry standards.

7.What is the process for return or replacement of ZTX790ASTZ?

All ZTX790ASTZ units undergo pre-shipment inspection (PSI). If there is an issue with ZTX790ASTZ, 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 ZTX790ASTZ part is unused and in its original packaging.

Return procedure for ZTX790ASTZ:

1.Submit a request within 90 days.

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

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