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onsemi PZTA42
- Part No.:
- PZTA42
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
PZTA42.pdf
- Description:
- TRANS NPN 300V 0.5A SOT-223-4
- Quantity:
- Payment:
- Shipping:
Inventory:8,004
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Product details
Overview
PZTA42T1G from onsemi is an NPN silicon high-voltage transistor in SOT-223 package, rated for VCEO = 300 V, IC = 500 mA, and PD = 1.5 W at TA = 25°C; designed for switching and amplification in high-voltage industrial power supplies and relay drivers.
For engineers reviewing the PZTA42T1G datasheet, pinout, applications, or equivalent options, key selection criteria include its 300 V breakdown rating, 50 MHz fT, SOT-223 thermal performance (RJA = 83.3°C/W), and complementarity to PZTA92T1G in push-pull configurations.
Technical Context
The PZTA42T1G operates as a general-purpose NPN bipolar junction transistor optimized for high-voltage linear and switching applications up to 300 V. Its DC current gain (hFE) ranges from 25 to 40 across IC = 1–30 mA at VCE = 10 V, with VCE(sat) ≤ 0.5 V at IC/IB = 10.
It features low feedback capacitance (Cre ≤ 3.0 pF), supports operation from −55°C to +150°C junction temperature, and meets AEC-Q101 for automotive-grade reliability when ordered as SPZTA42T1G.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 300 V - Enables use in 240 VAC line-switching and flyback snubber circuits without derating. |
| IC (DC) | 500 mA - Supports medium-current loads such as solenoid drivers and LED string switches. |
| fT | 50 MHz - Sufficient for audio-frequency amplification and low-speed digital switching (≤10 MHz). |
| VCE(sat) | ≤0.5 V @ IC/IB = 10 - Minimizes conduction loss in saturated-switch applications. |
| RJA | 83.3°C/W - Requires ≥0.93 in² copper pad on FR-4 for full 1.5 W dissipation at ambient. |
| hFE | 25–40 @ IC = 1–30 mA - Provides predictable base drive requirements for stable bias design. |
| Cre | ≤3.0 pF @ VCB = 20 V - Limits Miller effect in high-speed switching nodes. |
Pinout & Package
SOT-223 (TO-261) surface-mount package with 4 terminals: pins 1 (Base), 2 & 4 (Collector, internally connected), and 3 (Emitter). The dual-collector configuration improves thermal spreading and current handling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control input; requires current-limited drive (typically 1–5 mA) for saturation. |
| 2 & 4 | Collector | Internally tied; both pins must be soldered to large copper area for thermal management. |
| 3 | Emitter | Reference node for bias network; connects to ground or load return path. |
Key Features
| Feature | Design Value |
|---|---|
| High VCEO rating | 300 V enables direct interface with 240 VAC mains-derived rails without external voltage division. |
| AEC-Q101 qualification option | SPZTA42T1G variant supports automotive body electronics requiring PPAP documentation and site-controlled manufacturing. |
| Pb-free, Halogen-free | RoHS-compliant construction meets IPC-J-STD-020 moisture sensitivity level 3 (MSL3) for standard reflow. |
| Dual-collector thermal path | Pins 2 and 4 reduce thermal resistance by distributing heat across PCB copper area. |
Applications
| Industrial Power Supply | Automotive Relay Driver |
|---|---|
Use Scenario: High-side switch in 240 VAC-fed auxiliary power supply for PLC I/O modules. IC Role / Device Role / Timing Role: NPN switching transistor controlling transformer primary or optocoupler LED current. Use Value: 300 V VCEO eliminates need for series-connected transistors; 0.5 V VCE(sat) reduces power loss at 200 mA load. | Use Scenario: Driving 12 V/24 V automotive relays in body control modules (BCM). IC Role / Device Role / Timing Role: Low-side switch interfacing microcontroller GPIO to relay coil. Use Value: AEC-Q101 qualified SPZTA42T1G ensures reliability under load dump and cold-crank conditions. |
| LED String Controller | High-Voltage Signal Amplifier |
Use Scenario: Constant-current sink for multi-segment LED signage powered from 170 VDC bus. IC Role / Device Role / Timing Role: Linear current regulator using emitter-follower configuration with sense resistor. Use Value: 150°C TJ rating allows operation in enclosed enclosures; hFE stability over temperature simplifies feedback loop design. | Use Scenario: Audio preamplifier stage in high-voltage analog test equipment. IC Role / Device Role / Timing Role: Common-emitter small-signal amplifier with 50 MHz fT. Use Value: Low Cre (≤3 pF) minimizes high-frequency phase shift; VBE(sat) ≤ 0.9 V ensures clean turn-on in Class-A bias. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN high-voltage transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPSA42 | VCEO = 300 V, IC = 500 mA, but TO-92 package (RJA ≈ 200°C/W); no AEC-Q101 option. | Limited to low-power, non-automotive uses due to thermal and qualification constraints. | Choose MPSA42 only for prototyping or space-constrained through-hole designs where SMT is not required. |
| ZTX450 | VCEO = 300 V, IC = 1 A, SOT-89 package; higher power but different pinout and gain profile (hFE = 100–300). | Better suited for higher-current switching; requires layout revision and bias recalculation. | Select ZTX450 when >500 mA collector current or improved thermal performance (RJA = 60°C/W) is needed. |
Compared with MPSA42 and ZTX450, the PZTA42T1G uniquely balances 300 V capability, SOT-223 thermal efficiency, and automotive qualification readiness-making it optimal for production-grade high-voltage SMT switching where reliability and board-level thermal management are critical.
Availability
PZTA42T1G is available at Aetrix Electronics and suitable for industrial power supplies, automotive relay drivers, LED string controllers, and high-voltage signal amplifiers requiring stable component supply and long-term manufacturability.
Supply support for PZTA42T1G 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
onsemi (formerly ON Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The PZTA42T1G belongs to onsemi's high-voltage bipolar transistor product line, engineered specifically for robust switching and amplification in mains-connected and automotive systems where voltage tolerance and thermal resilience are essential.
FAQ
What is the maximum collector-emitter voltage rating for PZTA42T1G?
The PZTA42T1G has a guaranteed minimum VCEO of 300 Vdc at IC = 1.0 mAdc and TC = 25°C. This rating remains valid across its full operating junction temperature range (−55°C to +150°C), making PZTA42T1G suitable for direct interface with rectified 240 VAC lines without additional voltage clamping.
Is PZTA42T1G pin-compatible with PZTA92T1G?
No-PZTA42T1G is an NPN transistor while PZTA92T1G is its complementary PNP counterpart; they share identical SOT-223 packaging and voltage/current ratings but opposite polarity and pin functions. Both are intended for use together in push-pull or complementary output stages, not as drop-in replacements.
Does PZTA42T1G support automotive applications?
Yes-the SPZTA42T1G variant is AEC-Q101 qualified and PPAP capable, with controlled manufacturing site and change management per automotive requirements. Standard PZTA42T1G is not certified for automotive use; only SPZTA42T1G should be selected for BCM, lighting control, or other vehicle subsystems.
What is the thermal resistance of PZTA42T1G in typical PCB mounting?
When mounted on a 1.575 in × 1.575 in FR-4 board with 0.93 in² copper pad for the collector leads, the PZTA42T1G exhibits RJA = 83.3°C/W. This value assumes proper soldering of both collector pins (2 and 4) to the thermal pad; omitting either pin increases thermal resistance significantly.
Can PZTA42T1G be used in linear amplifier configurations?
Yes-PZTA42T1G supports linear operation with verified VBE(on) and hFE stability across temperature. Its fT = 50 MHz and low Cre (≤3.0 pF) allow stable audio-frequency amplification; however, power dissipation must remain within 1.5 W derated per ambient temperature and PCB thermal design to avoid exceeding TJ = 150°C.
PZTA42 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 500 mA
- Voltage - Collector Emitter Breakdown (Max):
- 300 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 2mA, 20mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 40 @ 30mA, 10V
- Power - Max:
- 1 W
- Frequency - Transition:
- 50MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-4
PZTA42 FAQ
1.How can I place an order for PZTA42 through Aetrix?
Please submit a Request for Quotation (RFQ) for PZTA42 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 PZTA42 reliable?
The price and inventory of PZTA42 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PZTA42 is usually 5 days.
3.What payment methods are accepted for PZTA42?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PZTA42 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PZTA42?
PZTA42 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PZTA42 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 PZTA42?
For technical support, including PZTA42 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PZTA42 requirements.
6.How does Aetrix verify that PZTA42 is sourced from the original manufacturer or authorized distributors?
All PZTA42 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 PZTA42 meets industry standards.
7.What is the process for return or replacement of PZTA42?
All PZTA42 units undergo pre-shipment inspection (PSI). If there is an issue with PZTA42, 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 PZTA42 part is unused and in its original packaging.
Return procedure for PZTA42:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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