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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

Diodes Incorporated ZXTN5551FLQTA

Name: ZXTN5551FLQTA
Brand: Diodes Incorporated
SKU: ZXTN5551FLQTA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZXTN5551FLQTA

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: ZXTN5551FLQTA.pdf

Description:: TRANS NPN 160V 0.6A SOT-23-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

ZXTN5551FLQTA from Diodes Incorporated is a 160V NPN high-voltage transistor in SOT23 package, rated for 600mA continuous collector current and 330mW power dissipation. It delivers BV_CEO ≥ 160V, V_CE(sat) = 65–200 mV (depending on I_C/I_B), and f_T = 130 MHz, enabling high-voltage amplification in automotive and industrial switching circuits.

For engineers reviewing the ZXTN5551FLQTA datasheet, ZXTN5551FLQTA pinout, ZXTN5551FLQTA application, or ZXTN5551FLQTA equivalent, key selection criteria include its AEC-Q101 qualification, 4kV HBM ESD rating, SOT23 thermal resistance of 379°C/W, and complementary PNP pairing with ZXTP5401FLQ for push-pull designs.

Technical Context

This NPN bipolar junction transistor operates in linear and switching modes with guaranteed breakdown voltages: V_CBO = 180 V min, V_CEO = 160 V min, and V_EBO = 6 V min. Its h_FE ranges from 80 to 250 across I_C = 10–50 mA at V_CE = 5 V, supporting stable gain in high-impedance bias networks.

Transient thermal impedance data shows <100°C/W at 100 µs pulse width, and safe operating area (SOA) extends to 160 V / 0.6 A under DC conditions on 25 mm × 25 mm FR4 PCB. The device meets IATF 16949 manufacturing standards and supports PPAP documentation for automotive use.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	160 V minimum - enables operation in 120 V AC line-derived supplies and flyback snubber circuits
I_C	600 mA continuous - supports medium-power switching loads such as relay drivers and LED ballasts
P_D	330 mW at T_A = 25°C - requires thermal pad layout per Diodes' SOT23 footprint for full rating
f_T	130 MHz - sufficient for audio-frequency amplification and low-MHz PWM control signal buffering
ESD HBM	4,000 V - provides robust handling during board assembly and field service in industrial environments
h_FE	80–250 @ I_C = 10–50 mA - ensures predictable base drive sizing across production lots and temperature range
R_θJA	379 °C/W - defines maximum junction rise above ambient under still-air conditions on standard PCB

Pinout & Package

Package: SOT23 - surface-mount plastic package with matte tin-plated leads, UL 94V-0 rated molding compound, and moisture sensitivity level 1 (J-STD-020).

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Connected to ground or low-side return path; determines saturation voltage floor in switch mode
2 (Base)	Control input	Receives current-limited drive; typical I_B = 1–5 mA for full saturation at I_C = 10–50 mA
3 (Collector)	High-voltage output node	Handles up to 160 V potential; connects to load or supply rail in common-emitter configuration

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive-grade reliability including temperature cycling, HTOL, and ESD stress per JESD47
Green, halogen-free construction	Meets RoHS 3 (2015/863/EU) with Br+Cl <1500 ppm and Sb <1000 ppm - supports eco-compliance programs
Complementary PNP pair	ZXTP5401FLQ shares identical SOT23 footprint and voltage/current ratings - simplifies dual-rail driver design
Low V_CE(sat) at high I_C	150 mV max at I_C = 50 mA / I_B = 5 mA - reduces conduction loss in 12–48 V switching applications

Applications

Automotive Lighting Control

Industrial Relay Drivers

Use Scenario: Driving high-brightness LED arrays in headlamp modules with 24 V supply rails and PWM dimming.

IC Role / Device Role / Timing Role: NPN switch controlling LED current path; handles transient overvoltage from inductive load kickback.

Use Value: 160 V V_CEO withstands load dump spikes up to 120 V; 600 mA rating supports multi-LED strings without parallel devices.

Use Scenario: Activating 24 VDC industrial relays with coil inductance >100 mH in PLC I/O modules.

IC Role / Device Role / Timing Role: Low-side switch providing galvanically isolated coil energization via optocoupler-driven base.

Use Value: 4 kV HBM ESD rating prevents latch-up during field wiring; SOT23 footprint enables dense I/O channel spacing.

AC-DC Auxiliary Power Supplies

High-Voltage Signal Amplification

Use Scenario: Regulating auxiliary bias winding output in offline flyback converters delivering 12 V/100 mA.

IC Role / Device Role / Timing Role: Linear pass transistor in shunt-regulated feedback loop, dissipating ≤200 mW continuously.

Use Value: 330 mW P_D and 379°C/W R_θJA allow stable operation without heatsink on standard FR4 layout.

Use Scenario: Amplifying sensor signals from piezoelectric transducers generating ±80 V pulses in ultrasonic flow meters.

IC Role / Device Role / Timing Role: High-input-impedance common-emitter amplifier stage with fixed-gain bias network.

Use Value: 130 MHz f_T preserves pulse fidelity up to 10 MHz; 160 V V_CEO avoids clipping on peak transients.

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
MJD127G	TO-220 package, 100 V V_CEO, 8 A I_C, higher P_D (1.5 W)	Requires heatsink; unsuitable for space-constrained SOT23 layouts	Select when higher current and thermal margin outweigh size constraints
ZXTN25012E6TA	SOT23-6 package, 200 V V_CEO, 500 mA I_C, lower h_FE (30–120)	Higher voltage margin but reduced gain consistency at low I_C	Prefer for 170–200 V systems where ZXTN5551FLQTA's 160 V rating is marginal

Compared with MJD127G and ZXTN25012E6TA, ZXTN5551FLQTA uniquely balances 160 V capability, SOT23 compactness, and 600 mA drive in an AEC-Q101-qualified part-making it optimal for automotive body electronics and industrial edge controllers where footprint and qualification are non-negotiable.

Availability

ZXTN5551FLQTA is available at Aetrix Electronics and suitable for automotive lighting control, industrial relay drivers, AC-DC auxiliary power supplies, and high-voltage signal amplification requiring stable component supply and long-term lifecycle assurance.

Supply support for ZXTN5551FLQTA 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 is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.

ZXTN5551FLQTA belongs to Diodes' ZXT family of high-voltage bipolar transistors engineered specifically for automotive and industrial applications demanding AEC-Q101 compliance, high breakdown voltage, and robust thermal performance in miniature packages.

FAQ

What is the maximum allowable collector-emitter voltage for ZXTN5551FLQTA in continuous operation?

The absolute maximum V_CEO is 160 V at T_A = 25°C, verified per JEDEC JESD78 testing. Derating is required above 25°C ambient: linear reduction to 0 V at 150°C junction temperature. Operation beyond 160 V risks avalanche-induced degradation even with short-duration transients.

Does ZXTN5551FLQTA require a heatsink in typical SOT23 PCB layouts?

No heatsink is required when mounted on a 25 mm × 25 mm 1 oz copper pad on single-sided FR4, as specified in the datasheet. Under those conditions, the 330 mW power rating is fully usable. Smaller pads or multilayer boards without thermal vias reduce effective P_D and may necessitate derating.

How does the ZXTN5551FLQTA's h_FE vary with temperature and collector current?

h_FE decreases by ~0.5%/°C above 25°C and drops from 145 (typ.) at I_C = 10 mA to 65 (min.) at I_C = 50 mA. Figure 3 in DS43755 Rev. 3-2 shows normalized gain curves across –55°C to +150°C, confirming usable gain down to –55°C and up to 100°C at rated I_C.

Is ZXTN5551FLQTA compatible with lead-free reflow profiles?

Yes - it is fully RoHS 3 compliant with matte tin-plated leads and rated for peak reflow temperatures up to 260°C per J-STD-020. Moisture sensitivity level 1 means no dry-pack or baking is required prior to assembly, simplifying SMT line integration.

ZXTN5551FLQTA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Bulk

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 600 mA

Voltage - Collector Emitter Breakdown (Max):: 160 V

Vce Saturation (Max) @ Ib, Ic:: 200mV @ 5mA, 50mA

Current - Collector Cutoff (Max):: 50nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 80 @ 10mA, 5V

Power - Max:: 330 mW

Frequency - Transition:: 130MHz

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

ZXTN5551FLQTA FAQ

1.How can I place an order for ZXTN5551FLQTA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZXTN5551FLQTA 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 ZXTN5551FLQTA reliable?

The price and inventory of ZXTN5551FLQTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXTN5551FLQTA is usually 5 days.

3.What payment methods are accepted for ZXTN5551FLQTA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXTN5551FLQTA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZXTN5551FLQTA?

ZXTN5551FLQTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZXTN5551FLQTA 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 ZXTN5551FLQTA?

For technical support, including ZXTN5551FLQTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXTN5551FLQTA requirements.

6.How does Aetrix verify that ZXTN5551FLQTA is sourced from the original manufacturer or authorized distributors?

All ZXTN5551FLQTA 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 ZXTN5551FLQTA meets industry standards.

7.What is the process for return or replacement of ZXTN5551FLQTA?

All ZXTN5551FLQTA units undergo pre-shipment inspection (PSI). If there is an issue with ZXTN5551FLQTA, 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 ZXTN5551FLQTA part is unused and in its original packaging.

Return procedure for ZXTN5551FLQTA:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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