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Nexperia USA Inc. PMST5550-QF
- Part No.:
- PMST5550-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
PMST5550-QF.pdf
- Description:
- TRANS NPN 140V 0.3A SOT-323
- Quantity:
- Payment:
- Shipping:
Inventory:7,413
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Product details
Overview
PMST5550-QF from Nexperia is an AEC-Q101-qualified NPN high-voltage transistor in SOT323 (SC-70) package, rated for 140 V VCEO, 300 mA IC, and 20–250 hFE at 50 mA. It serves as a switching and amplification device in automotive telephony and high-voltage interface circuits where compact size and voltage robustness are critical.
For engineers reviewing the PMST5550-QF datasheet, PMST5550-QF pinout, PMST5550-QF application, or PMST5550-QF equivalent, key selection criteria include its 140 V collector-emitter breakdown, 200 mW power dissipation at 25 °C ambient, AEC-Q101 qualification, SC-70 thermal resistance of 625 K/W, and verified 100 MHz fT performance.
Technical Context
This discrete NPN bipolar junction transistor operates with open-base VCEO = 140 V and open-emitter VCBO = 160 V, enabling reliable high-voltage switching in line-powered telecom interfaces. Its pulsed DC current gain (hFE) ranges from 20 to 250 across 1–50 mA IC, supporting both linear amplification and saturated switching modes.
Thermal design is constrained by Rth(j-a) = 625 K/W on FR4 PCB with single-sided copper, limiting continuous operation to ≤200 mW at Tamb ≤ 25 °C. Saturation voltages-VCE(sat) ≤ 250 mV at IC = 50 mA / IB = 5 mA and VBE(sat) ≤ 1.2 V-confirm suitability for low-loss digital switching in space-constrained automotive modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 140 V - Maximum collector-emitter voltage with base open; defines safe operating range in high-side switch configurations |
| IC | 300 mA - Continuous collector current limit; sets maximum load drive capability in relay drivers or signal amplifiers |
| hFE | 20–250 - DC current gain at VCE = 5 V, IC = 1–50 mA; enables predictable base drive sizing for saturation control |
| fT | 100 MHz - Transition frequency at VCE = 10 V, IC = 10 mA; supports audio-frequency amplification and fast edge switching |
| Rth(j-a) | 625 K/W - Junction-to-ambient thermal resistance on standard FR4 PCB; requires derating above 25 °C ambient for sustained operation |
| VCE(sat) | ≤250 mV - Collector-emitter saturation voltage at IC = 50 mA / IB = 5 mA; ensures <0.0125 W conduction loss in switching applications |
| AEC-Q101 | Qualified - Meets stress test requirements for automotive discrete semiconductors; supports under-hood and infotainment system deployment |
Pinout & Package
SOT323 (SC-70) plastic surface-mount package: 2.0 mm × 1.25 mm × 0.95 mm body, 1.3 mm lead pitch, 3-terminal configuration with gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Control terminal for forward-biased junction; requires current-limited drive to achieve target IC and avoid thermal runaway |
| 2 | Emitter (E) | Current return path; connected to ground or low-impedance reference in common-emitter configurations |
| 3 | Collector (C) | High-voltage output node; handles up to 140 V with respect to emitter; routed away from sensitive analog traces |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage capability | 160 V VCBO and 140 V VCEO enable use in 48 V telecom line interfaces and automotive battery-sensed circuits |
| AEC-Q101 qualification | Validated for automotive temperature range (−65 °C to +150 °C) and reliability stress tests; supports PPAP documentation |
| Miniature SOT323 footprint | 2.0 mm × 1.25 mm area saves board space in multi-channel telephony modules and compact ECU sensor interfaces |
| Low saturation voltage | VCE(sat) ≤ 250 mV at IC/IB = 10 ensures efficient switching with minimal heat generation in thermally restricted layouts |
| 100 MHz fT | Supports stable amplification up to voiceband frequencies (≤4 kHz) with margin for transient response in pulse-driven systems |
Applications
| Automotive Telephony Interface | 48 V Telecom Line Card |
|---|---|
|
Use Scenario: Isolating and amplifying ring-detection signals in vehicle hands-free systems connected to PSTN lines. IC Role / Device Role / Timing Role: NPN switch amplifying AC-coupled 20–100 Hz ring signals while blocking DC bias from telephone exchange equipment. Use Value: 140 V VCEO withstands line surges; 200 mW Ptot allows continuous monitoring without heatsinking in sealed enclosures. |
Use Scenario: Driving LED status indicators and optocoupler inputs on industrial 48 V backplane communication cards. IC Role / Device Role / Timing Role: High-side switch controlling current through 2–5 mA indicator loads referenced to 48 V rail. Use Value: 160 V VCBO prevents breakdown during transients; SC-70 footprint enables dense placement near connectors. |
| Automotive Door Module Sensor Driver | Low-Power Audio Preamp Stage |
|
Use Scenario: Switching resistive window motor sense resistors or Hall-effect sensor bias in door control units. IC Role / Device Role / Timing Role: Low-duty-cycle switch sampling sensor voltage drops with minimal leakage (<100 nA ICBO at 25 °C). Use Value: AEC-Q101 qualification ensures reliability over 15-year vehicle life; 6 pF Cc minimizes capacitive loading on precision sense nodes. |
Use Scenario: Single-transistor preamplifier stage for microphone signals in infotainment head units. IC Role / Device Role / Timing Role: Common-emitter amplifier with 20–250 hFE providing adjustable gain and 100 MHz bandwidth margin. Use Value: 8 dB noise figure at 10 Hz–15.7 kHz meets automotive audio SNR requirements; VBE(sat) ≤ 1.2 V simplifies bias network design. |
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 |
|---|---|---|---|
| BC847BW | Lower VCEO (45 V), higher hFE (110–800), same SOT323 package | Not suitable for >45 V line sensing; better for general-purpose low-voltage amplification | Select when voltage stress <45 V and higher gain consistency is required |
| MMBT5551 | Higher VCEO (160 V), larger SOT23 package, 100–300 hFE | Requires PCB redesign for SOT23 footprint; supports higher continuous IC (600 mA) | Choose for 160 V operation where board space permits SOT23 and thermal budget allows 350 mW |
Compared with BC847BW and MMBT5551, PMST5550-QF uniquely balances 140 V rating, AEC-Q101 compliance, and SOT323 footprint-making it optimal for space-constrained automotive telephony where voltage margin exceeds 45 V but full SOT23 real estate is unavailable.
Availability
PMST5550-QF is available at Aetrix Electronics and suitable for automotive telephony interfaces, 48 V telecom line cards, and door module sensor drivers requiring stable component supply and long-term lifecycle support.
Supply support for PMST5550-QF 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 logic, discrete, and MOSFET solutions, with leadership in automotive-qualified components.
PMST5550-QF belongs to Nexperia's AEC-Q101-qualified high-voltage bipolar transistor family, engineered specifically for automotive signal conditioning and interface applications demanding voltage resilience and compact packaging.
FAQ
Is PMST5550-QF pin-compatible with standard SOT323 NPN transistors?
Yes-PMST5550-QF uses standard SC-70 (SOT323) pinning: Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector. This matches JEDEC-standard SOT323 NPN devices like BC847 series, enabling direct PCB footprint reuse where voltage and gain specs align.
What is the maximum allowable junction temperature during continuous operation?
The absolute maximum junction temperature (Tj) is 150 °C. With Rth(j-a) = 625 K/W on FR4, continuous operation at full 200 mW Ptot is only permissible at Tamb ≤ 25 °C; derating to 100 mW is required at 75 °C ambient to maintain Tj ≤ 150 °C.
Does PMST5550-QF support pulsed operation beyond its DC ratings?
Yes-peak collector current (ICM) is rated at 600 mA for short pulses (tp ≤ 300 µs, duty cycle δ ≤ 0.02), enabling surge handling in ring-detection or transient-sensing applications without exceeding thermal limits.
How does the AEC-Q101 qualification impact design validation for automotive use?
AEC-Q101 qualification confirms PMST5550-QF has passed accelerated stress tests including HTGB, HTRB, and temperature cycling-reducing need for redundant qualification testing. However, system-level validation (e.g., EMC, board-level thermal profiling) remains the designer's responsibility per ISO 26262 functional safety requirements.
PMST5550-QF 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):
- 300 mA
- Voltage - Collector Emitter Breakdown (Max):
- 140 V
- Vce Saturation (Max) @ Ib, Ic:
- 250mV @ 5mA, 50mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 60 @ 10mA, 5V
- Power - Max:
- 200 mW
- Frequency - Transition:
- 300MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
PMST5550-QF FAQ
1.How can I place an order for PMST5550-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for PMST5550-QF 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 PMST5550-QF reliable?
The price and inventory of PMST5550-QF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PMST5550-QF is usually 5 days.
3.What payment methods are accepted for PMST5550-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PMST5550-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PMST5550-QF?
PMST5550-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PMST5550-QF 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 PMST5550-QF?
For technical support, including PMST5550-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PMST5550-QF requirements.
6.How does Aetrix verify that PMST5550-QF is sourced from the original manufacturer or authorized distributors?
All PMST5550-QF 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 PMST5550-QF meets industry standards.
7.What is the process for return or replacement of PMST5550-QF?
All PMST5550-QF units undergo pre-shipment inspection (PSI). If there is an issue with PMST5550-QF, 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 PMST5550-QF part is unused and in its original packaging.
Return procedure for PMST5550-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PMST5550-QF Tags
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