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

Diodes Incorporated ZTX1047ASTOA

Name: ZTX1047ASTOA
Brand: Diodes Incorporated
SKU: ZTX1047ASTOA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZTX1047ASTOA

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

Package:: E-Line-3, Formed Leads

Datasheet:: ZTX1047ASTOA.pdf

Description:: TRANS NPN 10V 4A E-LINE

Quantity:: RFQ Add To RFQ list

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Inventory:2,542

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Product details

Overview

ZTX1047ASTOA from Diodes Incorporated (formerly Zetex) is an NPN silicon planar medium-power high-gain transistor rated for 4 A continuous collector current, 10 V V_CEO, and 1 W power dissipation at 25°C ambient. It delivers very low V_CE(sat) (as low as 23 mV @ IC=0.5A/IB=10mA), h_FE up to 1200 at low current, and f_T = 150 MHz - optimized for DC-DC converter switching and power supply control stages.

For engineers reviewing the ZTX1047ASTOA datasheet, ZTX1047ASTOA pinout, ZTX1047ASTOA application, or ZTX1047ASTOA equivalent, key selection criteria include saturation voltage under high-current switching, safe operating area at elevated junction temperatures (–55°C to +200°C), gain linearity across 10 mA–4 A, and TO-92-compatible mechanical fit in space-constrained power management PCBs.

Technical Context

This transistor employs a planar epitaxial structure enabling stable high-current operation with low thermal resistance and robust secondary breakdown immunity. Its V_CEO = 10 V and V_CBO = 35 V define a low-voltage, high-current switching profile suited for synchronous rectification and linear regulator pass elements.

The device exhibits pulsed I_CM = 20 A and fast switching times (t_on = 130 ns, t_off = 180 ns at IC = 4 A), supported by SPICE parameters including BF = 550, VAF = 120 V, and C_JE = 540.4 pF - confirming suitability for high-efficiency, high-frequency (>50 MHz) switching topologies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	10 V - Maximum sustainable collector-emitter voltage before avalanche; defines use in ≤12 V rail switching applications.
I_C (continuous)	4 A - Continuous DC current handling capacity; enables single-transistor load switching in compact DC-DC modules.
V_CE(sat) @ IC=4A/IB=20mA	40–70 mV - Ultra-low saturation voltage minimizes conduction loss and heatsink requirements in high-current paths.
h_FE @ IC=4A	150–230 - Sustained DC current gain at full rated current ensures reliable base drive margin without excessive IB overhead.
f_T	150 MHz - Transition frequency confirms usable gain-bandwidth for PWM control loop compensation and fast transient response.
T_j range	–55°C to +200°C - Extended junction temperature rating supports operation in automotive engine-bay and industrial motor-control environments.
t_on/t_off	130 ns / 180 ns - Verified switching speed under 4 A load enables >500 kHz switching frequencies with low overlap loss.

Pinout & Package

Package: TO-92 compatible (E-Line variant), through-hole, epoxy-molded plastic case with standard lead spacing and coplanarity for wave soldering.

Pin/Terminal	Circuit Role	Design Meaning
Emitter (E)	Current sink terminal	Low-impedance return path; connected to ground or low-side switch node in buck converters.
Base (B)	Control input	Receives current-limited drive signal; requires ≥20 mA for full saturation at 4 A output.
Collector (C)	Current source terminal	Connected to switched rail or inductive load; handles full load current and flyback energy during turn-off.

Key Features

Feature	Design Value
Very low V_CE(sat)	23 mV min @ IC = 0.5 A - reduces I²R losses by >60% vs. standard general-purpose transistors at same current.
High h_FE linearity	h_FE ≥ 150 at IC = 4 A - maintains predictable base drive requirements across full load range.
Extended SOA	Single-pulse safe operating area supports 4 A @ 10 V for 10 ms - enables robust short-circuit tolerance in unregulated supplies.
High-temperature capability	Rated T_j up to +200°C - permits operation in sealed enclosures without forced air cooling.
SPICE-model validated	Complete .MODEL card provided (BF=550, VAF=120 V, C_JE=540.4 pF) - enables accurate simulation of switching waveforms and thermal stress.

Applications

DC-DC Buck Converter

Linear Regulator Pass Element

Use Scenario: High-efficiency 5 V → 3.3 V step-down conversion delivering up to 3.5 A continuous output.

IC Role / Device Role / Timing Role: Low-side synchronous switch controlling inductor current discharge phase.

Use Value: V_CE(sat) ≤ 40 mV at 4 A reduces conduction loss to <140 mW, enabling >94% efficiency at full load.

Use Scenario: Adjustable positive voltage regulator supplying 1.2–12 V at up to 3 A for FPGA core rails.

IC Role / Device Role / Timing Role: Series pass transistor dissipating excess voltage between input and output.

Use Value: h_FE ≥ 150 at 4 A ensures stable regulation with minimal base drive error, reducing dropout voltage sensitivity.

Automotive Body Control Module

Industrial Motor Driver Stage

Use Scenario: 12 V load switching for interior lighting, window lifters, and HVAC actuators.

IC Role / Device Role / Timing Role: High-current driver for resistive/inductive loads with integrated flyback protection.

Use Value: T_j rating to +200°C allows direct mounting on metal chassis without derating in under-hood environments.

Use Scenario: Half-bridge low-side switch in 24 V BLDC motor gate driver auxiliary stage.

IC Role / Device Role / Timing Role: Fast-turning current sink for bootstrap capacitor recharge and gate pull-down.

Use Value: t_off = 180 ns ensures clean dead-time control and prevents shoot-through in 100 kHz motor commutation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ZTX1051ASTOA	V_CEO = 15 V, V_CE(sat) = 50–100 mV @ 4 A, h_FE = 100–200 at 4 A	Higher V_CEO supports 15 V systems; slightly higher saturation loss	Select when wider voltage margin is required over improved efficiency.
MJD127G	TO-220 package, I_C = 5 A, V_CEO = 100 V, V_CE(sat) = 1.2 V @ 3 A	Higher voltage rating but significantly higher V_CE(sat); requires heatsink	Select only when >10 V blocking or >4 A peak current is mandatory; not drop-in.

Compared with ZTX1051ASTOA, ZTX1047ASTOA offers lower V_CE(sat) and higher h_FE at 4 A - critical for thermally constrained DC-DC designs. Against MJD127G, it trades voltage headroom and package size for superior efficiency and board-level thermal performance in ≤12 V systems.

Availability

ZTX1047ASTOA is available at Aetrix Electronics and suitable for DC-DC converters, automotive body control modules, and industrial motor driver stages requiring stable component supply, consistent parametric performance across production lots, and long-term availability in through-hole packaging.

Supply support for ZTX1047ASTOA 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 acquired Zetex Semiconductors in 2008, integrating its high-performance analog and discrete portfolio into a global power management and signal integrity platform.

ZTX1047ASTOA belongs to Zetex's legacy E-Line high-gain transistor family, engineered specifically for high-efficiency, high-reliability switching in space- and thermal-constrained power conversion circuits.

FAQ

What is the maximum allowable base current for continuous operation?

The absolute maximum rated base current is 500 mA, but continuous operation at this level is not recommended. For reliable 4 A collector current, IB = 20 mA is specified in datasheet conditions. Sustained IB > 100 mA risks thermal runaway due to localized heating at the base-emitter junction, especially above 100°C ambient.

Can ZTX1047ASTOA be used in linear amplifier configurations?

No - it is not characterized or optimized for linear amplification. The device lacks guaranteed h_FE consistency at low currents (<1 mA) and has no specified distortion, noise, or linearity parameters. Its design prioritizes switching efficiency and SOA, not small-signal fidelity or bias stability.

Is the TO-92-compatible package RoHS-compliant?

Yes - ZTX1047ASTOA is manufactured per Diodes Incorporated's current RoHS-6 and REACH compliance standards. The epoxy molding compound contains no lead, cadmium, mercury, hexavalent chromium, PBB, or PBDE, and lead finish on leads meets J-STD-020 moisture sensitivity level 1 (MSL-1).

Does the datasheet specify avalanche energy rating (E_AS)?

No - the datasheet does not provide an avalanche energy rating. While V_CEO = 10 V and V_CES = 35 V indicate some avalanche capability, the device is not tested or guaranteed for repetitive avalanche operation. External snubbers or clamping diodes are required for inductive load switching where V_CE may exceed 10 V.

ZTX1047ASTOA 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:: NPN

Current - Collector (Ic) (Max):: 4 A

Voltage - Collector Emitter Breakdown (Max):: 10 V

Vce Saturation (Max) @ Ib, Ic:: 190mV @ 20mA, 4A

Current - Collector Cutoff (Max):: 10nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 300 @ 1A, 2V

Power - Max:: 1 W

Frequency - Transition:: 150MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

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

ZTX1047ASTOA FAQ

1.How can I place an order for ZTX1047ASTOA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZTX1047ASTOA 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 ZTX1047ASTOA reliable?

The price and inventory of ZTX1047ASTOA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTX1047ASTOA is usually 5 days.

3.What payment methods are accepted for ZTX1047ASTOA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTX1047ASTOA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZTX1047ASTOA?

ZTX1047ASTOA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZTX1047ASTOA 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 ZTX1047ASTOA?

For technical support, including ZTX1047ASTOA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTX1047ASTOA requirements.

6.How does Aetrix verify that ZTX1047ASTOA is sourced from the original manufacturer or authorized distributors?

All ZTX1047ASTOA 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 ZTX1047ASTOA meets industry standards.

7.What is the process for return or replacement of ZTX1047ASTOA?

All ZTX1047ASTOA units undergo pre-shipment inspection (PSI). If there is an issue with ZTX1047ASTOA, 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 ZTX1047ASTOA part is unused and in its original packaging.

Return procedure for ZTX1047ASTOA:

1.Submit a request within 90 days.

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

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