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Diodes Incorporated ZTX1049ASTOA
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- Part No.:
- ZTX1049ASTOA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- E-Line-3, Formed Leads
- Datasheet:
-
ZTX1049ASTOA.pdf
- Description:
- TRANS NPN 25V 4A E-LINE
- Quantity:
- Payment:
- Shipping:
Inventory:4,302
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Product details
Overview
ZTX1049ASTOA from Diodes Incorporated is a 25V NPN medium-power transistor in E-Line (TO-92 compatible) package, rated for 4A continuous collector current, 20A peak pulse current, and 1W power dissipation at TA=25°C with minimum 175°C/W junction-to-ambient thermal resistance; used in LCD backlight converters, emergency lighting, and DC-DC converters.
For engineers reviewing the ZTX1049ASTOA datasheet, ZTX1049ASTOA pinout, ZTX1049ASTOA application, or ZTX1049ASTOA equivalent, key selection criteria include VCEO = 25V, IC = 4A, VCE(sat) ≤ 155mV @ 4A/50mA, hFE ≥ 35 @ 4A, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This NPN bipolar junction transistor operates with a minimum BVCEO of 25V and supports high-current switching up to 4A continuous and 20A pulsed, enabling use in high-efficiency DC-DC converter output stages. Its low VCE(sat) (≤155mV @ 4A/50mA) and high hFE (≥35 at 4A) reduce conduction loss and base drive requirements.
Thermally rated for operation from –55°C to +200°C junction temperature, it features RθJL = 63.75°C/W and qualifies to AEC-Q101, making it suitable for under-hood automotive lighting and industrial power supplies where thermal robustness and reliability are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 25 V - Maximum safe collector-emitter voltage before breakdown under open-base conditions |
| IC | 4 A - Continuous collector current rating defining steady-state power stage capability |
| VCE(sat) | 155 mV @ 4A/50mA - Low saturation voltage minimizes conduction loss in switching applications |
| hFE | 35 min @ 4A - Minimum DC current gain ensures reliable base drive margin at full load |
| PD | 1 W @ TA=25°C - Power dissipation limit on standard PCB layout with 12mm lead length |
| TJ max | +200°C - Extended junction temperature rating enables operation in high-ambient environments |
| ESD HBM | ≥4000 V - Robust electrostatic discharge immunity per JEDEC JESD22-A114 Class 3A |
Pinout & Package
E-Line (TO-92 compatible) molded plastic package with matte tin-plated leads; UL 94V-0 flammability rating; weight ≈ 0.159 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Emitter (E) | Current sink terminal | Connected to ground or low-side return path; lowest impedance path for collector current |
| Collector (C) | Current source terminal | Primary power output node; thermally coupled to lead for enhanced heat transfer (RθJL = 63.75°C/W) |
| Base (B) | Control input terminal | Receives forward-biased drive current (max 500 mA) to saturate or cut off the transistor |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity, and mechanical shock |
| High-temperature operation | Junction temperature range –55°C to +200°C supports under-hood and industrial ambient conditions |
| Low VCE(sat) | ≤155 mV @ 4A/50mA reduces conduction loss and improves efficiency in switching regulators |
| Green construction | Halogen- and antimony-free molding compound (<900 ppm Br/Cl, <1000 ppm Sb) compliant with RoHS 2 |
| High pulse current capability | 20A ICM enables short-duration overload handling in LED driver surge events |
Applications
| LCD Backlight Converter | Emergency Lighting Driver |
|---|---|
Use Scenario: Step-up DC-DC converter driving parallel white LED strings in notebook displays. IC Role / Device Role / Timing Role: NPN switch controlling primary-side current in self-oscillating or PWM-controlled flyback topology. Use Value: Low VCE(sat) and high IC enable >90% efficiency at 4A peak LED current while maintaining thermal stability. | Use Scenario: Constant-current LED driver activated during AC mains failure in commercial exit signs. IC Role / Device Role / Timing Role: High-reliability switching element in boost converter powering 12–24V LED arrays from 3.7V Li-ion battery. Use Value: AEC-Q101 qualification and –55°C to +200°C TJ ensure fail-safe operation across storage, transport, and deployment environments. |
| Industrial DC-DC Module | Automotive Interior Lighting |
Use Scenario: Isolated 5V/3.3V auxiliary supply in programmable logic controller (PLC) backplane. IC Role / Device Role / Timing Role: Medium-power switching transistor in discrete flyback transformer driver stage. Use Value: 1W power rating and 175°C/W RθJA allow stable operation without heatsink in confined 25mm × 25mm PCB area. | Use Scenario: Dimmable map light and courtesy lamp driver in vehicle cabin modules. IC Role / Device Role / Timing Role: PWM-controlled current switch regulating brightness via duty-cycle modulation. Use Value: 20A ICM withstands inrush currents during cold-start battery conditions (–40°C), ensuring consistent illumination. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN medium-power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX1051A | VCEO = 30V, IC = 3A, VCE(sat) = 180mV @ 3A/30mA | Higher voltage margin but lower current and higher saturation loss | Preferred when system requires >25V breakdown headroom and thermal budget allows higher VCE(sat) |
| MJD122 | VCEO = 100V, IC = 3A, TO-220 package, RθJA = 50°C/W | Higher voltage rating and superior thermal performance, but larger footprint and higher cost | Selected when board space permits TO-220 and design requires >80V VCBO or improved heatsinking |
Compared with ZTX1049ASTOA, ZTX1051A trades 1A lower current and higher VCE(sat) for +5V VCEO margin, while MJD122 offers double the voltage rating and better thermal resistance at the cost of size and assembly complexity.
Availability
ZTX1049ASTOA is available at Aetrix Electronics and suitable for LCD backlight converters, emergency lighting systems, and industrial DC-DC modules requiring stable component supply, AEC-Q101 compliance, and high-temperature operational continuity.
Supply support for ZTX1049ASTOA 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 power management, signal integrity, and protection solutions.
The ZTX series delivers medium-power bipolar transistors optimized for automotive lighting, industrial power conversion, and high-temperature switching applications where robustness and consistency are essential.
FAQ
What is the maximum allowable collector-emitter voltage for ZTX1049ASTOA?
The absolute maximum collector-emitter voltage (VCEO) is 25 V under open-base conditions at TA = 25°C. Exceeding this rating risks avalanche breakdown and permanent device damage. Derating is required above 25°C ambient, with linear reduction per the datasheet's thermal derating curve.
Is ZTX1049ASTOA suitable for automotive applications?
Yes - ZTX1049ASTOA is qualified to AEC-Q101 standards, covering stress tests for temperature cycling, humidity, mechanical shock, and high-temperature operating life. It is approved for use in non-safety-critical automotive lighting and power modules, excluding life-support systems.
How does the E-Line package compare to standard TO-92 in assembly?
The E-Line package is mechanically compatible with TO-92 footprints but features joggled leads for improved retention in wave-solder processes. Its 0.159 g mass and UL 94V-0 rated molding compound meet IPC-A-610 Class 2/3 requirements for industrial and automotive assemblies.
What is the typical fT (transition frequency) of ZTX1049ASTOA?
The typical current gain–bandwidth product (fT) is 180 MHz, measured at VCE = 10 V and IC = 50 mA. This supports high-speed switching in DC-DC controllers up to ~500 kHz, though practical switching speed is limited by stored charge and external drive strength.
ZTX1049ASTOA 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):
- 25 V
- Vce Saturation (Max) @ Ib, Ic:
- 220mV @ 50mA, 4A
- Current - Collector Cutoff (Max):
- 10nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 300 @ 1A, 2V
- Power - Max:
- 1 W
- Frequency - Transition:
- 180MHz
- Operating Temperature:
- -55°C ~ 200°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- E-Line (TO-92 compatible)
ZTX1049ASTOA FAQ
1.How can I place an order for ZTX1049ASTOA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZTX1049ASTOA 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 ZTX1049ASTOA reliable?
The price and inventory of ZTX1049ASTOA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTX1049ASTOA is usually 5 days.
3.What payment methods are accepted for ZTX1049ASTOA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTX1049ASTOA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZTX1049ASTOA?
ZTX1049ASTOA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZTX1049ASTOA 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 ZTX1049ASTOA?
For technical support, including ZTX1049ASTOA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTX1049ASTOA requirements.
6.How does Aetrix verify that ZTX1049ASTOA is sourced from the original manufacturer or authorized distributors?
All ZTX1049ASTOA 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 ZTX1049ASTOA meets industry standards.
7.What is the process for return or replacement of ZTX1049ASTOA?
All ZTX1049ASTOA units undergo pre-shipment inspection (PSI). If there is an issue with ZTX1049ASTOA, 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 ZTX1049ASTOA part is unused and in its original packaging.
Return procedure for ZTX1049ASTOA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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