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

Diodes Incorporated ZTX1047A

Name: ZTX1047A
Brand: Diodes Incorporated
SKU: ZTX1047A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZTX1047A

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

Package:: E-Line-3

Datasheet:: ZTX1047A.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:5,480

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Product details

Overview

ZTX1047A from Zetex plc is an NPN silicon planar medium-power high-gain transistor optimized for switching in low-voltage, high-current DC-DC converters and power supply rails, with V_CEO = 10 V, I_C = 4 A continuous, V_CE(sat) as low as 23 mV at I_C = 0.5 A / I_B = 10 mA, and h_FE ≥ 280 at I_C = 10 mA.

For engineers reviewing the ZTX1047A datasheet, ZTX1047A pinout, ZTX1047A application, or ZTX1047A equivalent, key selection criteria include saturation voltage under pulsed high-current conditions, safe operating area at elevated junction temperatures (−55°C to +200°C), and base drive efficiency at IC/IB = 50–300 for compact power stage design.

Technical Context

This device operates as a medium-power NPN switch with low V_CE(sat) enabling high-efficiency operation in 10 V rail systems. Its f_T = 150 MHz supports fast turn-on/turn-off (t_on = 130 ns, t_off = 180 ns) under pulsed 4 A loads with ±40 mA base drive.

The SOA curve is defined for single-pulse operation up to 100 ms at T_amb = 25°C, with derating to 0.25 W at 120°C ambient. SPICE model parameters (e.g., BF = 550, VAF = 120 V, C_JE = 540 pF) are provided for accurate transient simulation of switching waveforms.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	10 V - Maximum collector-emitter voltage before breakdown; defines usable rail voltage in low-voltage switching supplies.
I_C (continuous)	4 A - Sustained collector current capability; enables direct replacement of TO-92 transistors in 3–5 W power stages.
V_CE(sat) @ 0.5 A/10 mA	23–44 mV - Ultra-low saturation voltage reduces conduction loss and thermal stress in high-duty-cycle switches.
h_FE @ 10 mA	280–440 - High DC current gain allows minimal base drive current, easing driver IC selection and PCB layout.
f_T	150 MHz - Transition frequency supports clean square-wave switching up to ~10–20 MHz with controlled rise/fall times.
t_on/t_off	130 ns / 180 ns - Fast switching times minimize overlap loss in synchronous or complementary topologies.
T_j range	−55°C to +200°C - Extended junction temperature rating supports operation in automotive engine-bay or industrial motor-control environments.

Pinout & Package

Package: TO-92 compatible (E-Line), through-hole, epoxy-molded plastic case with standard lead spacing and mechanical footprint.

Pin/Terminal	Circuit Role	Design Meaning
E (Emitter)	Current sink terminal	Connected to ground or low-side return path; lowest impedance node for heat dissipation via PCB copper pour.
B (Base)	Control input	Receives TTL- or CMOS-compatible drive; requires ≤500 mA peak current per absolute max rating.
C (Collector)	High-current output	Switches load between supply rail and emitter; rated for 20 A pulsed (ICM) with proper heatsinking.

Key Features

Feature	Design Value
Very low V_CE(sat)	23 mV min at I_C = 0.5 A - Reduces power loss by >50% vs. standard general-purpose transistors at same current.
High h_FE across wide I_C range	h_FE ≥ 110 at I_C = 20 A - Maintains effective current amplification even under heavy overload conditions.
Extended SOA at high temperature	Derated to 0.25 W at 120°C ambient - Enables reliable operation without external heatsink in sealed enclosures.
SPICE-model ready	Full Gummel-Poon model with verified C_JE, C_JC, TF, TR - Supports accurate prediction of switching overshoot and ringing in buck converter simulations.

Applications

DC-DC Buck Converter

Low-Voltage Power Switch

Use Scenario: Step-down regulation from 12 V to 5 V/3.3 V in embedded controllers with 2–5 A output.

IC Role / Device Role: Main switching transistor in non-synchronous buck topology, driven by PWM controller.

Use Value: Low V_CE(sat) and high h_FE reduce gate drive losses and improve full-load efficiency by 1.2–1.8% over ZTX1051A.

Use Scenario: On/off control of 10 V, 3 A solenoid or relay coil in industrial PLC output modules.

IC Role / Device Role: Single-ended low-side switch replacing discrete MOSFET+driver combos in cost-sensitive designs.

Use Value: TO-92 compatibility enables drop-in replacement of legacy transistors while supporting 4 A surge without derating.

Automotive Body Control

LED Driver for High-Current Arrays

Use Scenario: Load switching for interior lighting, HVAC actuators, or window lift motors in 12 V vehicle systems.

IC Role / Device Role: High-reliability NPN switch handling repetitive 10 A pulses at −40°C to +125°C ambient.

Use Value: −55°C to +200°C T_j rating ensures functional safety compliance without additional thermal margin overhead.

Use Scenario: Constant-current switching for 10–20 W RGB LED strings in signage or architectural lighting.

IC Role / Device Role: Linear or PWM-controlled current sink with analog dimming capability via base bias.

Use Value: Tight V_BE(sat) tolerance (860–950 mV) enables stable current setting across production batches without trimming.

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
ZTX1051A	V_CEO = 15 V, V_CE(sat) = 35–65 mV @ 0.5 A, h_FE = 200–350	Higher voltage headroom but higher saturation loss; less suitable for 10 V rail optimization	Select when system requires >12 V collector swing and can tolerate 50% higher conduction loss.
BCP56-10	TO-92 variant with V_CEO = 80 V, V_CE(sat) = 500 mV @ 1 A, h_FE = 100–250	Higher voltage rating but significantly higher V_CE(sat); unsuitable for <12 V high-efficiency switching	Choose only for general-purpose linear switching where voltage margin outweighs efficiency needs.

Compared with ZTX1051A and BCP56-10, the ZTX1047A delivers superior efficiency in ≤10 V systems due to its uniquely low V_CE(sat) and extended h_FE at high current, making it optimal for thermally constrained DC-DC and automotive body electronics.

Availability

ZTX1047A is available at Aetrix Electronics and suitable for DC-DC converters, automotive body control units, and high-current LED drivers requiring stable component supply across long-lifecycle industrial programs.

Supply support for ZTX1047A 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

Zetex plc (now part of Diodes Incorporated) was a UK-based semiconductor specialist focused on high-performance discrete transistors and analog ICs for power management and signal conditioning.

The ZTX series was engineered specifically for high-efficiency, high-reliability switching in space-constrained 10 V and lower power systems-prioritizing low saturation voltage, wide SOA, and robust thermal performance over generic gain or voltage specs.

FAQ

Is ZTX1047A suitable for linear regulator pass transistor applications?

No. Its V_CEO = 10 V and limited SOA at high V_CE make it unsuitable for linear regulation above 5 V dropout. It is optimized for switching operation with low V_CE and high I_C, not for sustained high-voltage, high-current linear biasing.

What is the maximum allowable base current for continuous operation?

The absolute maximum continuous base current is 500 mA, but practical design limits IB to ≤200 mA for reliability. At I_C = 4 A, recommended IB = 20 mA (IC/IB = 200) per datasheet test condition; exceeding 50 mA risks thermal runaway in TO-92 package without forced cooling.

Does ZTX1047A have built-in ESD protection?

No. The device has no integrated ESD protection diodes. Per datasheet, V_EB rating is only 5 V, and IEBO is specified at 100 µA-designers must add external series resistors and/or TVS clamps on base and emitter lines in noisy environments like automotive or industrial settings.

Can ZTX1047A be used in parallel configurations for higher current?

Not recommended without individual emitter resistors. Due to positive temperature coefficient of V_BE(sat), paralleling increases current imbalance. The datasheet does not specify matching tolerances, and thermal coupling in TO-92 packages causes unequal junction heating-use discrete current-sharing resistors (≥0.1 Ω) if parallel operation is unavoidable.

ZTX1047A Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: E-Line-3

Packaging:: Bulk

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)

ZTX1047A FAQ

1.How can I place an order for ZTX1047A through Aetrix?

Please submit a Request for Quotation (RFQ) for ZTX1047A 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 ZTX1047A reliable?

The price and inventory of ZTX1047A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTX1047A is usually 5 days.

3.What payment methods are accepted for ZTX1047A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTX1047A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZTX1047A?

ZTX1047A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZTX1047A 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 ZTX1047A?

For technical support, including ZTX1047A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTX1047A requirements.

6.How does Aetrix verify that ZTX1047A is sourced from the original manufacturer or authorized distributors?

All ZTX1047A 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 ZTX1047A meets industry standards.

7.What is the process for return or replacement of ZTX1047A?

All ZTX1047A units undergo pre-shipment inspection (PSI). If there is an issue with ZTX1047A, 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 ZTX1047A part is unused and in its original packaging.

Return procedure for ZTX1047A:

1.Submit a request within 90 days.

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

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