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Diodes Incorporated ZTX1049ASTZ
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- Part No.:
- ZTX1049ASTZ
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- E-Line-3, Formed Leads
- Datasheet:
-
ZTX1049ASTZ.pdf
- Description:
- TRANS NPN 25V 4A E-LINE
- Quantity:
- Payment:
- Shipping:
Inventory:2,226
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Product details
Overview
ZTX1049ASTZ 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 12mm lead length. It features low VCE(sat) of 45mV @ 1A/10mA IB and operates up to +200°C junction temperature, used in LCD backlight converters and DC-DC converter switching stages.
For engineers reviewing the ZTX1049ASTZ datasheet, ZTX1049ASTZ pinout, ZTX1049ASTZ application, or ZTX1049ASTZ equivalent, key selection criteria include its AEC-Q101 qualification, 25V VCEO rating, 175°C/W RθJA under minimum pad layout, and verified 180MHz fT performance in pulsed conditions.
Technical Context
This NPN bipolar junction transistor is optimized for medium-power switching applications requiring high reliability and thermal robustness. Its BVCEO = 25V and IC = 4A support operation in step-down and flyback converter primary-side switches, while the 200°C TJ max enables use in thermally constrained automotive and industrial environments.
The device exhibits low saturation voltage (VCE(sat) = 45mV @ IC = 1A, IB = 10mA) and high DC current gain (hFE = 350 @ IC = 1A), enabling efficient conduction with minimal base drive overhead. Its 180MHz fT and fast switching times (ton = 125ns, toff = 380ns) support operation in PWM frequencies up to several hundred kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 25V - maximum allowable collector-emitter voltage before breakdown in common-emitter configuration |
| IC (cont) | 4A - continuous collector current capability with proper PCB thermal management |
| PD (min pad) | 1W - power dissipation limit when mounted on minimum recommended pad layout (RθJA = 175°C/W) |
| VCE(sat) @ 1A | 45mV - low saturation voltage ensures <45mW conduction loss per transistor at 1A load |
| fT | 180MHz - current gain-bandwidth product confirming suitability for high-speed switching up to ~100kHz practical PWM |
| TJ max | +200°C - extended junction temperature rating supports operation in sealed enclosures or high-ambient environments |
| ESD HBM | ≥4kV - human-body-model ESD robustness suitable for assembly handling without special precautions |
Pinout & Package
E-Line (TO-92 compatible) plastic package with joggled leads; molded "Green" compound, UL 94V-0 rated, matte tin-plated leads solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Emitter (E) | Current sink terminal | Connected to ground or low-side return path; carries full load current in common-emitter switch configuration |
| Collector (C) | Current source terminal | Connected to switched rail or inductive load; must withstand 25V VCEO and handle 4A continuous current |
| Base (B) | Control input | Receives current-limited drive signal (max 500mA IB); requires ~0.85V VBE(on) to saturate at 4A IC |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTOL, and ESD stress per JESD22 standards |
| Low VCE(sat) | 45mV @ 1A/10mA IB reduces conduction losses and thermal loading in high-duty-cycle switching |
| High TJ rating | +200°C maximum junction temperature allows operation in sealed housings or near heat sources without derating |
| Lead-free & Green | RoHS-compliant, halogen- and antimony-free molding compound meeting Diodes Inc.'s "Green" definition (<900ppm Br/Cl, <1000ppm Sb) |
| Fast switching | 125ns turn-on and 380ns turn-off times enable efficient operation in 200–500kHz DC-DC topologies |
Applications
| LCD Backlight Converter | Emergency Lighting Driver |
|---|---|
Use Scenario: Driving CCFL or LED strings in automotive or industrial display panels with PWM dimming. IC Role / Device Role / Timing Role: NPN switch controlling current through boost inductor and resonant tank during flyback phase. Use Value: Low VCE(sat) minimizes power loss in high-current pulses; AEC-Q101 rating ensures long-term reliability in vibration-prone environments. | Use Scenario: High-efficiency DC-DC conversion in battery-backed emergency lighting systems operating from 12V or 24V rails. IC Role / Device Role / Timing Role: Primary-side switching transistor in isolated flyback or non-isolated buck-boost converter. Use Value: 4A IC rating supports >20W output; 200°C TJ rating accommodates ambient temperatures up to +85°C inside enclosed fixtures. |
| Industrial DC-DC Module | Automotive Interior Power Supply |
Use Scenario: Compact 12V-to-5V/3.3V point-of-load regulator in programmable logic controllers or sensor interface modules. IC Role / Device Role / Timing Role: Medium-power switching element in synchronous or diode-rectified buck topology. Use Value: 180MHz fT and fast switching enable stable regulation at 300kHz; TO-92-compatible E-Line simplifies manual rework and legacy board compatibility. | Use Scenario: Power conversion for infotainment displays, HVAC controls, or USB charging ports in passenger compartments. IC Role / Device Role / Timing Role: High-reliability switching transistor in 12V-input buck or SEPIC converter supplying regulated 5V/12V rails. Use Value: AEC-Q101 qualification and -55°C to +200°C operating range ensure compliance with automotive environmental stress requirements. |
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 |
|---|---|---|---|
| ZTX1051ASTZ | Higher VCEO = 30V, same IC = 4A, slightly higher VCE(sat) = 50mV @ 1A | Better suited for 24V nominal systems with transient overvoltage margin | Select when system rail exceeds 20V or requires ≥30V breakdown headroom |
| MJD122G | TO-220 package, IC = 8A, VCEO = 100V, RθJA = 40°C/W (with heatsink) | Higher power handling but requires PCB real estate and thermal management | Choose for >5W continuous dissipation or forced-air-cooled designs where E-Line footprint is insufficient |
Compared with ZTX1049ASTZ, ZTX1051ASTZ offers greater voltage margin at identical current capability and package, while MJD122G delivers significantly higher power capacity in a larger package-making ZTX1049ASTZ optimal for space-constrained, thermally moderate 25V-class switching where TO-92 compatibility and AEC-Q101 compliance are essential.
Availability
ZTX1049ASTZ is available at Aetrix Electronics and suitable for LCD backlight converters, emergency lighting drivers, and industrial DC-DC modules requiring stable component supply and automotive-grade reliability.
Supply support for ZTX1049ASTZ 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 components for automotive, industrial, and consumer markets.
The ZTX series targets medium-power bipolar switching applications demanding AEC-Q101 qualification, high-temperature operation, and TO-92-compatible packaging for cost-sensitive, space-constrained designs.
FAQ
What is the maximum safe operating voltage for ZTX1049ASTZ in a common-emitter configuration?
The absolute maximum collector-emitter voltage (VCEO) is 25V, verified per DS33327 Rev. 5–2. Operation above this value risks avalanche breakdown and permanent damage. For 12V or 24V rail applications with transients, design margins must ensure VCES does not exceed 25V under worst-case switching conditions.
Can ZTX1049ASTZ be used in surface-mount designs?
No - ZTX1049ASTZ uses an E-Line package with joggled through-hole leads and is not designed for SMT reflow. Its thermal performance relies on lead-to-PCB conduction; mounting on SMT pads without proper thermal vias or lead forming will exceed RθJA limits and cause premature failure.
Is ZTX1049ASTZ suitable for linear (analog) amplification applications?
It is not optimized for linear operation: hFE variation across IC (35–1200) and limited fT bandwidth make it unsuitable for precision analog gain stages. Its design intent is switching - confirmed by low VCE(sat), fast ton/toff, and AEC-Q101 stress testing focused on repetitive pulse reliability.
How does the 1W power rating relate to PCB layout?
The 1W rating applies only when mounted per Note 6: minimum recommended pad layout with 12mm lead length and single-sided FR4. Using shorter leads or no copper pour increases RθJA to 175°C/W, limiting usable power to ~0.57W at TA = 70°C - underscoring the need to follow Diodes' AP02002 layout guidelines.
ZTX1049ASTZ 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:
- 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)
ZTX1049ASTZ FAQ
1.How can I place an order for ZTX1049ASTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ZTX1049ASTZ 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 ZTX1049ASTZ reliable?
The price and inventory of ZTX1049ASTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTX1049ASTZ is usually 5 days.
3.What payment methods are accepted for ZTX1049ASTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTX1049ASTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZTX1049ASTZ?
ZTX1049ASTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZTX1049ASTZ 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 ZTX1049ASTZ?
For technical support, including ZTX1049ASTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTX1049ASTZ requirements.
6.How does Aetrix verify that ZTX1049ASTZ is sourced from the original manufacturer or authorized distributors?
All ZTX1049ASTZ 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 ZTX1049ASTZ meets industry standards.
7.What is the process for return or replacement of ZTX1049ASTZ?
All ZTX1049ASTZ units undergo pre-shipment inspection (PSI). If there is an issue with ZTX1049ASTZ, 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 ZTX1049ASTZ part is unused and in its original packaging.
Return procedure for ZTX1049ASTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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