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Nexperia USA Inc. PZTA42/ZLX
- Part No.:
- PZTA42/ZLX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
PZTA42/ZLX.pdf
- Description:
- TRANS NPN 300V 0.1A SOT-223
- Quantity:
- Payment:
- Shipping:
Inventory:2,618
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Product details
Overview
PZTA42 from Nexperia is an NPN high-voltage bipolar junction transistor in SOT223 (SC-73) package, rated for 300 V VCEO, 100 mA IC, and 1.2 W Ptot at Tamb ≤ 25 °C; used as a high-voltage switch or linear amplifier in telephony line interface circuits.
For engineers reviewing the PZTA42 datasheet, PZTA42 pinout, PZTA42 application, or PZTA42 equivalent, key selection criteria include collector-emitter breakdown voltage, DC current gain at low-mid bias points, thermal resistance to solder point, saturation voltage under defined drive conditions, and compatibility with wave/reflow footprints for SOT223.
Technical Context
The PZTA42 operates as a general-purpose NPN BJT optimized for high-voltage switching where low leakage and stable hFE across 1–30 mA are critical. It features dual-collector configuration (pins 2 and 4 tied internally), enabling enhanced thermal dissipation via the exposed collector pad.
Its 300 V VCEO and 200 V VCBO support off-hook line feeding and ringing signal generation in analog telephony; hFE of 25–40 at IC = 1–30 mA ensures predictable base drive requirements in Class-A or saturated-switching topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 300 V - supports full telephone line voltage transients including 90 V RMS ringing + 60 V DC loop feed without breakdown |
| IC max | 100 mA - defines maximum continuous collector current for sustained linear or switching operation |
| hFE | 25–40 - usable DC current gain range at VCE = 10 V, enabling reliable base resistor sizing for 1–30 mA loads |
| VCE(sat) | 500 mV max - low saturation voltage reduces power loss and self-heating during switching conduction |
| Rth(j-sp) | 23 K/W - thermal resistance to solder point enables effective heat transfer to PCB copper when mounted per recommended footprint |
| fT | 50 MHz - transition frequency supports audio-frequency amplification and fast edge control in pulse applications |
| ICBO | 20 nA max - ultra-low collector-base leakage ensures stable biasing in high-impedance, high-voltage nodes |
Pinout & Package
SOT223 (SC-73) surface-mount plastic package with 4 leads, 2.3 mm pitch, 6.5 mm × 3.5 mm × 1.65 mm body, and thermally enhanced exposed collector pad (pins 2 and 4).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Control terminal; requires current-limited drive to achieve target IC with specified hFE |
| 2 | Collector (C) | Main power output terminal; electrically and thermally connected to exposed copper pad on underside |
| 3 | Emitter (E) | Reference terminal for bias network; connects to ground or negative rail in common-emitter configurations |
| 4 | Collector (C) | Duplicate collector terminal - internally bonded to pin 2 to improve current handling and thermal path to PCB |
Key Features
| Feature | Design Value |
|---|---|
| Dual-collector thermal design | Pins 2 and 4 both connect to the same internal collector node and exposed metal pad, lowering Rth(j-sp) to 23 K/W |
| High-voltage blocking capability | 300 V VCEO and 300 V VCBO enable direct use in telecom line interface without external snubbers |
| Low leakage performance | 20 nA ICBO at 200 V ensures minimal standby current in always-on line circuits |
| Standardized SOT223 footprint | Compatible with industry-standard reflow and wave soldering profiles per Nexperia's documented land patterns |
Applications
| Telephony Line Interface | Industrial Signal Isolation |
|---|---|
Use Scenario: Driving analog telephone line signals including ring detection, off-hook sensing, and loop feed in PBX or VoIP gateway hardware. IC Role / Device Role / Timing Role: High-voltage NPN switch controlling DC loop current and AC ringing injection onto twisted-pair lines. Use Value: 300 V rating eliminates need for series Zener clamping; low VCE(sat) minimizes power loss during active loop feed. | Use Scenario: Level-shifting and isolating control signals between 24 V industrial PLC outputs and 3.3/5 V microcontroller inputs. IC Role / Device Role / Timing Role: Discrete NPN translator providing galvanic separation and voltage translation without optocoupler latency. Use Value: 100 mA IC supports direct drive of LED indicators or small relays; hFE stability ensures consistent turn-on behavior across temperature. |
| AC Mains-Sensing Circuits | High-Voltage Sensor Biasing |
Use Scenario: Zero-crossing detection and AC mains voltage monitoring in smart energy meters and solid-state relays. IC Role / Device Role / Timing Role: High-side NPN switch enabling resistive divider input to be pulled to ground only during safe zero-crossing windows. Use Value: 300 V VCEO allows direct connection to 230 V RMS lines with appropriate current limiting; low ICBO prevents false triggering. | Use Scenario: Providing stable bias current to high-voltage photodiodes or piezoelectric sensors operating up to 200 V. IC Role / Device Role / Timing Role: Constant-current source configured in emitter-follower or common-emitter mode with precision base resistor. Use Value: hFE consistency across 1–10 mA enables accurate current setting; low VBE(sat) improves compliance voltage margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage NPN transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPSA42 | Same VCEO = 300 V, but lower Ptot = 625 mW and higher Rth(j-a) = 200 K/W | Less suitable for sustained 100 mA operation without heatsinking; better for low-duty-cycle pulse switching | Select when board space is constrained and thermal budget allows reduced power derating |
| BCP56-16 | Lower VCEO = 80 V, higher hFE = 100–250, Ptot = 1.5 W | Not suitable for >100 V applications; preferred for medium-voltage, high-gain linear amplification | Select only if system voltage remains below 60 V and higher gain is required for low-base-drive designs |
Compared with MPSA42 and BCP56-16, the PZTA42 uniquely balances 300 V capability, 100 mA current rating, and 23 K/W thermal resistance to solder point-making it optimal for thermally demanding, high-voltage telephony and industrial interface roles where reliability under sustained load matters.
Availability
PZTA42 is available at Aetrix Electronics and suitable for telephony infrastructure, industrial PLC I/O modules, and AC mains monitoring systems requiring stable component supply and long-term manufacturability.
Supply support for PZTA42 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
Nexperia is a global semiconductor expert headquartered in Nijmegen, Netherlands, specializing in high-volume, high-reliability discrete and logic devices for industrial, consumer, and automotive markets.
The PZTA42 belongs to Nexperia's high-voltage bipolar transistor product line, engineered specifically for robust performance in analog telephony, line interface, and industrial signal conditioning applications where voltage resilience and thermal stability are essential.
FAQ
What is the maximum continuous collector current for PZTA42?
The PZTA42 is rated for 100 mA continuous collector current (IC) at ambient temperatures ≤25 °C with proper PCB copper area. Derating is required above 25 °C per the thermal resistance curve; at 70 °C ambient, maximum IC drops to approximately 65 mA to maintain junction temperature ≤150 °C.
Is PZTA42 pin-compatible with MPSA42?
No-PZTA42 uses SOT223 (SC-73) with four pins and dual collector terminals, while MPSA42 uses TO-92 with three pins and no exposed thermal pad. The pin assignments differ fundamentally, and the SOT223 footprint cannot accommodate TO-92 packages without redesign. Electrical substitution requires layout revision.
Can PZTA42 be used in automotive applications?
No-per Nexperia's official documentation, PZTA42 is explicitly designated as non-automotive qualified. It has not undergone AEC-Q101 stress testing or qualification for temperature cycling, humidity, or vibration per automotive standards. Automotive designs require parts marked with "-Q" suffix (e.g., PZTA42-Q).
What is the purpose of pin 4 on the PZTA42?
Pin 4 is a second collector terminal, internally connected to pin 2. Its inclusion enhances thermal conduction by increasing solder joint area to the PCB's copper pour, reducing Rth(j-sp) to 23 K/W. It must be soldered to the same net as pin 2 and should not be left floating or repurposed.
PZTA42/ZLX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 100 mA
- Voltage - Collector Emitter Breakdown (Max):
- 300 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 2mA, 20mA
- Current - Collector Cutoff (Max):
- 20nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 40 @ 30mA, 10V
- Power - Max:
- 1.2 W
- Frequency - Transition:
- 50MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223
PZTA42/ZLX FAQ
1.How can I place an order for PZTA42/ZLX through Aetrix?
Please submit a Request for Quotation (RFQ) for PZTA42/ZLX 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/ZLX reliable?
The price and inventory of PZTA42/ZLX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PZTA42/ZLX is usually 5 days.
3.What payment methods are accepted for PZTA42/ZLX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PZTA42/ZLX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PZTA42/ZLX?
PZTA42/ZLX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PZTA42/ZLX 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/ZLX?
For technical support, including PZTA42/ZLX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PZTA42/ZLX requirements.
6.How does Aetrix verify that PZTA42/ZLX is sourced from the original manufacturer or authorized distributors?
All PZTA42/ZLX 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/ZLX meets industry standards.
7.What is the process for return or replacement of PZTA42/ZLX?
All PZTA42/ZLX units undergo pre-shipment inspection (PSI). If there is an issue with PZTA42/ZLX, 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/ZLX part is unused and in its original packaging.
Return procedure for PZTA42/ZLX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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