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Diodes Incorporated ZTX1149ASTOA
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- Part No.:
- ZTX1149ASTOA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- E-Line-3, Formed Leads
- Datasheet:
-
ZTX1149ASTOA.pdf
- Description:
- TRANS PNP 25V 3A E-LINE
- Quantity:
- Payment:
- Shipping:
Inventory:4,686
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Product details
Overview
ZTX1149ASTOA from Diodes Incorporated (formerly Zetex) is a PNP silicon planar medium-power high-gain bipolar junction transistor in TO-92 package, rated for -25 V VCEO, -3 A continuous collector current, and 135 MHz transition frequency, used in linear amplification and switching circuits in industrial power supplies and motor control stages.
For engineers reviewing the ZTX1149ASTOA datasheet, ZTX1149ASTOA pinout, ZTX1149ASTOA application, or ZTX1149ASTOA equivalent, key selection criteria include verified VCE(sat) ≤ -200 mV at IC = -3 A / IB = -70 mA, hFE ≥ 195 at IC = -2 A, thermal resistance profile up to +200°C junction temperature, and TO-92 mechanical compatibility with legacy board layouts.
Technical Context
This PNP BJT operates in common-emitter configuration with base-controlled current amplification. Its high DC current gain (hFE up to 800 at low IC) and low saturation voltage support efficient switching in medium-power loads, while fT = 135 MHz enables stable operation in audio-frequency amplifiers and PWM-driven gate drivers.
The device features robust ruggedness with V(BR)CBO = -30 V, V(BR)CEO = -25 V, and safe operating area validated to 10 ms pulses at -4 A, making it suitable for transient-tolerant industrial interfaces where overvoltage and surge immunity are required without external clamping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -25 V - Maximum allowable collector-emitter voltage before breakdown under open-base condition |
| IC (cont.) | -3 A - Continuous collector current rating at Tamb = 25°C, defining steady-state load drive capability |
| VCE(sat) | -200 mV @ IC = -3 A, IB = -70 mA - Low conduction loss enabling <1 W dissipation in saturated switch mode |
| hFE | 195 @ IC = -2 A - Confirmed DC current gain ensuring reliable base drive margin in linear regulators |
| fT | 135 MHz @ IC = -50 mA - Small-signal bandwidth supporting audio and low-MHz switching applications |
| Tj max | +200°C - Maximum junction temperature enabling operation in sealed enclosures or high-ambient environments |
| Ptot | 1 W @ Tamb = 25°C - Total power dissipation limit dictating heatsinking requirements for sustained loads |
Pinout & Package
Package: TO-92 (E-Line compatible), through-hole, epoxy-molded plastic case with standard lead spacing and orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| E (Emitter) | Current source terminal for PNP operation | Connected to higher potential rail; defines reference for base bias and collector load return path |
| B (Base) | Control input for minority-carrier injection | Receives negative current to turn on; requires ≥ -70 mA for full saturation at -3 A load |
| C (Collector) | Current sink terminal | Connected to load and lower-potential supply; carries full output current with minimal VCE(sat) |
Key Features
| Feature | Design Value |
|---|---|
| High DC current gain | hFE ≥ 195 at IC = -2 A reduces required base drive current and simplifies driver stage design |
| Low saturation voltage | VCE(sat) ≤ -200 mV at full rated current minimizes conduction losses in switching regulators |
| Extended temperature range | Operable from -55°C to +200°C junction temperature supports deployment in automotive engine bays and industrial ovens |
| Rugged SOA | Validated safe operating area up to 10 ms at -4 A enables tolerance of motor startup surges and inductive kickback |
| TO-92 mechanical compatibility | E-Line footprint ensures drop-in replacement for legacy ZTX series transistors without PCB redesign |
Applications
| DC Motor Driver Stage | Linear Voltage Regulator Pass Element |
|---|---|
Use Scenario: Driving 12 V brushed DC motors in industrial actuators with PWM frequencies up to 20 kHz. IC Role / Device Role / Timing Role: PNP switch controlling motor current path between supply rail and ground-return loop. Use Value: VCE(sat) ≤ -200 mV at -3 A limits power loss to <0.6 W, reducing thermal stress during continuous duty cycles. | Use Scenario: High-stability series pass element in adjustable 5–15 V linear regulators powering analog sensor front-ends. IC Role / Device Role / Timing Role: Current-amplifying pass transistor regulating output by modulating base-emitter voltage. Use Value: hFE ≥ 195 at -2 A ensures precise load regulation with minimal base current error contribution. |
| Overvoltage Protection Circuit | Audio Power Amplifier Output Stage |
Use Scenario: Clamping transient spikes above -25 V in 24 V industrial control inputs using emitter-follower configuration. IC Role / Device Role / Timing Role: Active crowbar element conducting fault current when VCE exceeds breakdown threshold. Use Value: V(BR)CEO = -25 V and Tj = +200°C allow reliable operation during repeated surge events without thermal runaway. | Use Scenario: Complementary PNP output pair in Class AB audio amplifiers delivering 1–2 W into 8 Ω loads. IC Role / Device Role / Timing Role: High-linearity current source in push-pull output stage handling signal peaks up to 100 kHz. Use Value: fT = 135 MHz and low Ccb = 50 pF preserve phase margin and minimize distortion at audible frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP medium-power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX1150ASTOA | VCEO = -30 V, IC = -2 A, hFE min = 100 @ IC = -1 A | Higher voltage rating but lower current and gain; suited for higher-voltage, lower-current switching | Select when VCE stress exceeds -25 V but load current remains ≤ -2 A |
| MJD2955G | TO-220 package, IC = -10 A, VCEO = -60 V, hFE = 20–70 | Higher power handling but lower gain and larger footprint; requires heatsink and layout change | Choose only when >3 A continuous current or >1 W dissipation is required |
Compared with ZTX1149ASTOA, ZTX1150ASTOA trades current capability for enhanced voltage margin, while MJD2955G provides scalable power at the cost of gain linearity and board-space efficiency-neither offers identical performance in TO-92-constrained, high-gain switching roles.
Availability
ZTX1149ASTOA is available at Aetrix Electronics and suitable for industrial motor drives, analog power regulation, overvoltage protection circuits, and audio amplifier output stages requiring stable component supply and long-term manufacturability.
Supply support for ZTX1149ASTOA 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 plc in 2008 and maintains its portfolio of high-performance discrete semiconductors focused on precision analog and power-efficient switching.
ZTX1149ASTOA belongs to the ZTX series of medium-power bipolar transistors engineered for reliability in industrial control, power conversion, and signal conditioning applications where gain stability and thermal robustness are critical.
FAQ
What is the maximum safe continuous collector current for ZTX1149ASTOA at 70°C ambient?
At Tamb = 70°C, derating applies per the datasheet's thermal curve: Ptot drops to ~0.65 W, limiting IC to approximately -2.3 A for VCE(sat) ≈ -170 mV. This assumes no heatsink and natural convection cooling on standard FR-4 PCB with 1-inch² copper pour.
Does ZTX1149ASTOA support pulsed operation beyond its continuous ratings?
Yes-absolute maximum pulse current is -10 A with pulse width ≤ 300 µs and duty cycle ≤ 2%. Validated safe operating area data confirms stable operation at -4 A for 10 ms pulses, making it suitable for motor-start surge handling and capacitor-charging applications.
Is ZTX1149ASTOA RoHS compliant and halogen-free?
Yes-ZTX1149ASTOA meets RoHS Directive 2011/65/EU and is certified halogen-free per IEC 61249-2-21. Diodes Incorporated's official product change notice (PCN #17-0023) confirms compliance effective Q3 2017 for all TO-92-packaged ZTX devices.
Can ZTX1149ASTOA be used in complementary pairs with NPN transistors like ZTX1148ASTOA?
Yes-ZTX1149ASTOA (PNP) and ZTX1148ASTOA (NPN) share matched TO-92 packaging, thermal characteristics, and gain profiles (hFE 195–800 vs. 200–850), enabling symmetrical Class AB audio output stages and H-bridge drivers with balanced switching behavior and thermal tracking.
ZTX1149ASTOA 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:
- PNP
- Current - Collector (Ic) (Max):
- 3 A
- Voltage - Collector Emitter Breakdown (Max):
- 25 V
- Vce Saturation (Max) @ Ib, Ic:
- 300mV @ 70mA, 3A
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 250 @ 500mA, 2V
- Power - Max:
- 1 W
- Frequency - Transition:
- 135MHz
- Operating Temperature:
- -55°C ~ 200°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- E-Line (TO-92 compatible)
ZTX1149ASTOA FAQ
1.How can I place an order for ZTX1149ASTOA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZTX1149ASTOA 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 ZTX1149ASTOA reliable?
The price and inventory of ZTX1149ASTOA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTX1149ASTOA is usually 5 days.
3.What payment methods are accepted for ZTX1149ASTOA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTX1149ASTOA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZTX1149ASTOA?
ZTX1149ASTOA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZTX1149ASTOA 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 ZTX1149ASTOA?
For technical support, including ZTX1149ASTOA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTX1149ASTOA requirements.
6.How does Aetrix verify that ZTX1149ASTOA is sourced from the original manufacturer or authorized distributors?
All ZTX1149ASTOA 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 ZTX1149ASTOA meets industry standards.
7.What is the process for return or replacement of ZTX1149ASTOA?
All ZTX1149ASTOA units undergo pre-shipment inspection (PSI). If there is an issue with ZTX1149ASTOA, 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 ZTX1149ASTOA part is unused and in its original packaging.
Return procedure for ZTX1149ASTOA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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