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Nexperia USA Inc. PMST4401,135
- Part No.:
- PMST4401,135
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
PMST4401,135.pdf
- Description:
- TRANS NPN 40V 0.6A SOT-323
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
PMST4401 from Nexperia is an NPN bipolar junction transistor (BJT) designed for general-purpose switching and linear amplification in space-constrained portable electronics. It delivers 600 mA collector current, supports 40 V collector-emitter voltage, achieves DC current gain (hFE) of 80 at 10 mA/1 V, and operates within −65 °C to +150 °C ambient range. Its SOT323 (SC-70) package enables compact battery-powered load control.
For engineers reviewing the PMST4401 datasheet, PMST4401 pinout, PMST4401 application, or PMST4401 equivalent, key selection criteria include its 200 mW power dissipation at 25 °C ambient, 625 K/W junction-to-ambient thermal resistance on FR4 PCB, low 750 mV VCE(sat) at 500 mA/50 mA drive, and verified switching performance with 35 ns turn-on and 250 ns turn-off times.
Technical Context
The PMST4401 is a discrete silicon NPN BJT optimized for low-voltage, medium-current switching. Its design centers on fast switching response (20 ns rise, 60 ns fall) and stable DC gain across temperature (hFE = 100–300 at 150 mA, 25 °C), supported by low base-emitter saturation voltage (1.2 V max at 500 mA).
It operates under IEC 60134 absolute maximum ratings: 40 V VCEO, 600 mA IC, 200 mW Ptot, and 150 °C Tj. Thermal performance is specified for standard FR4 PCB mounting with single-sided copper and tin plating-no heatsink required below 150 mA continuous operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 40 V - Maximum safe collector-emitter voltage with base open; defines upper rail limit in 3.3 V/5 V logic-level switch designs. |
| IC | 600 mA - Continuous collector current rating; supports driving small relays, LEDs, or MOSFET gates in handheld devices. |
| hFE | 80 (min) at 10 mA/1 V - Ensures reliable base drive margin for saturated switching at low currents without excessive base current overhead. |
| VCE(sat) | 750 mV (max) at 500 mA/50 mA - Minimizes conduction loss and self-heating in high-duty-cycle switching applications. |
| fT | 250 MHz - Enables use in RF pre-driver stages or high-speed digital signal conditioning up to ~100 MHz. |
| Rth(j-a) | 625 K/W - Thermal resistance on standard FR4; limits usable DC current to ~150 mA without derating at 25 °C ambient. |
Pinout & Package
SOT323 (SC-70) plastic surface-mount package: 3-pin, 1.3 mm pitch, 2.0 mm × 1.25 mm × 0.95 mm body size, optimized for reflow soldering on dense PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Control input terminal; requires ~15 mA base current to saturate at 500 mA collector load. |
| 2 | Emiter (E) | Common reference node for emitter-grounded configurations; connects to PCB ground plane for thermal and noise control. |
| 3 | Collector (C) | Output current path; routed to load (e.g., LED string or relay coil); thermally coupled to PCB copper for passive cooling. |
Key Features
| Feature | Design Value |
|---|---|
| High-speed switching | 35 ns turn-on / 250 ns turn-off - Reduces transition losses in PWM-driven loads operating up to 1 MHz. |
| Low VBE(sat) | 1.2 V max at 500 mA - Enables direct drive from 1.8 V/3.3 V microcontrollers without level-shifting circuitry. |
| Wide temperature range | −65 °C to +150 °C operation - Supports deployment in industrial sensors and automotive cabin modules (non-automotive qualified). |
| Low capacitance | 8 pF collector capacitance - Preserves signal integrity in high-frequency amplifier or oscillator bias networks. |
Applications
| Portable Power Switching | LED Current Control |
|---|---|
Use Scenario: On/off control of 3.3 V peripheral rails in Bluetooth earbuds and wearables. IC Role / Device Role / Timing Role: Discrete NPN switch enabling low-quiescent-power enable/disable of PMIC outputs or sensor subsystems. Use Value: 750 mV VCE(sat) minimizes voltage drop and extends battery runtime versus higher-VCE(sat) alternatives. |
Use Scenario: Constant-current sink for multi-segment status LEDs in medical handheld devices. IC Role / Device Role / Timing Role: Linear-mode current regulator with fixed base bias; replaces dedicated LED driver ICs in cost-sensitive designs. Use Value: hFE stability over temperature ensures consistent LED brightness across −20 °C to +60 °C operating range. |
| Signal Level Translation | Microcontroller GPIO Expansion |
Use Scenario: Converting 1.8 V logic outputs to 5 V-compatible signals for legacy interface ICs. IC Role / Device Role / Timing Role: Active pull-up stage in open-collector bus interfaces (e.g., I²C auxiliary lines). Use Value: 250 MHz fT supports clean edge transitions up to 10 MHz clock rates without overshoot. |
Use Scenario: Driving external MOSFET gates or solenoid coils from resource-limited MCU GPIO pins. IC Role / Device Role / Timing Role: Low-side switch buffer that isolates MCU pins from inductive kickback and ESD transients. Use Value: 600 mA IC rating allows direct gate charging of ≤1 nF capacitive loads at 10 kHz PWM frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN switching transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC847BW | Same SOT323 package; hFE = 110–220 (min 110), VCEO = 45 V, VCE(sat) = 600 mV @ 100 mA - tighter gain distribution but lower current capability (100 mA IC). | Better suited for precision analog amplification or low-current logic buffering; not rated for >200 mA continuous loads. | Select when gain consistency and low VCE(sat) at sub-100 mA are prioritized over peak current handling. |
| MMBT4401 | SOT23 package (larger footprint); same electrical specs (40 V/600 mA), but Rth(j-a) = 400 K/W - superior thermal performance on standard PCBs. | Preferred for higher-reliability industrial controls where sustained 500 mA operation demands lower junction temperature rise. | Choose when board layout permits SOT23 and thermal margin is critical; avoid if space-constrained SC-70 is mandatory. |
Compared with BC847BW and MMBT4401, the PMST4401 uniquely balances ultra-compact SOT323 packaging, 600 mA current capability, and proven 250 ns turn-off in portable systems-making it optimal where volume and switching speed outweigh gain spread or thermal headroom requirements.
Availability
PMST4401 is available at Aetrix Electronics and suitable for portable power switching, LED current control, signal level translation, and microcontroller GPIO expansion requiring stable component supply and long-term production continuity.
Supply support for PMST4401 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 focused on high-volume, high-reliability discrete and logic devices, with leadership in automotive, industrial, and mobile applications.
The PMST4401 belongs to Nexperia's general-purpose BJT portfolio, engineered specifically for miniaturized consumer electronics where SC-70 footprint, fast switching, and robust parametric consistency are essential.
FAQ
Is the PMST4401 automotive-qualified?
No. Per Nexperia's revision history (v.5, September 2025), the PMST4401 is explicitly designated as non-automotive qualified. It lacks AEC-Q101 stress testing and is not warranted for safety-critical or engine-compartment applications. Automotive alternatives must be selected from Nexperia's -Q qualified product line.
What is the maximum continuous collector current at 85 °C ambient?
Derating per the datasheet's thermal characteristics: at Tamb = 85 °C, the allowable collector current drops to approximately 320 mA. This is calculated using the 200 mW Ptot rating and 625 K/W Rth(j-a), assuming Tj ≤ 150 °C: IC(max) ≈ √(Ptot × hFE/VCE(sat)) yields practical limit near 320 mA for sustained operation.
Can the PMST4401 replace a BC547 in existing SOT23 designs?
No direct replacement: the PMST4401 uses SOT323 (SC-70), while BC547 is typically in TO-92 or SOT23. Pin compatibility is absent-SOT323 pin 1 is Base, SOT23 pin 1 is Emitter. Electrical similarity exists (VCEO, hFE), but mechanical redesign and layout revision are required for SOT323 integration.
Does the PMST4401 have built-in ESD protection?
No. The datasheet does not specify any integrated ESD protection diodes or HBM/CDM ratings beyond standard device robustness. External TVS or series resistors are recommended when used on exposed I/O lines or in environments with >2 kV HBM risk, especially in handheld device button or sensor interfaces.
PMST4401,135 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 600 mA
- Voltage - Collector Emitter Breakdown (Max):
- 40 V
- Vce Saturation (Max) @ Ib, Ic:
- 750mV @ 50mA, 500mA
- Current - Collector Cutoff (Max):
- 50nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 150mA, 1V
- Power - Max:
- 200 mW
- Frequency - Transition:
- 250MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
PMST4401,135 FAQ
1.How can I place an order for PMST4401,135 through Aetrix?
Please submit a Request for Quotation (RFQ) for PMST4401,135 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 PMST4401,135 reliable?
The price and inventory of PMST4401,135 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PMST4401,135 is usually 5 days.
3.What payment methods are accepted for PMST4401,135?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PMST4401,135 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PMST4401,135?
PMST4401,135 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PMST4401,135 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 PMST4401,135?
For technical support, including PMST4401,135 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PMST4401,135 requirements.
6.How does Aetrix verify that PMST4401,135 is sourced from the original manufacturer or authorized distributors?
All PMST4401,135 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 PMST4401,135 meets industry standards.
7.What is the process for return or replacement of PMST4401,135?
All PMST4401,135 units undergo pre-shipment inspection (PSI). If there is an issue with PMST4401,135, 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 PMST4401,135 part is unused and in its original packaging.
Return procedure for PMST4401,135:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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