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

onsemi MMBT6517LT3

Name: MMBT6517LT3
Brand: onsemi
SKU: MMBT6517LT3
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MMBT6517LT3

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: MMBT6517LT3.pdf

Description:: TRANS NPN 350V 0.1A SOT23-3

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Product details

Overview

MMBT6517LT3 from onsemi is an NPN silicon high-voltage transistor rated for 350 V V_CEO and 350 V V_CBO, with 100 mA continuous collector current and 225 mW power dissipation on FR-5 board. It delivers DC current gain (h_FE) of 20–200 across 1–100 mA I_C, supports fast switching with f_T up to 200 MHz, and is used in high-voltage biasing and flyback snubber circuits in automotive lighting and industrial power supplies.

For engineers reviewing the MMBT6517LT3 datasheet, pinout, applications, or equivalent options, key selection criteria include its 350 V breakdown rating, SOT-23 package thermal limits, h_FE variation vs. I_C, V_CE(sat) at 50 mA/5 mA drive, and AEC-Q101 qualification status for automotive use.

Technical Context

This device operates as a general-purpose high-voltage NPN switch with guaranteed V_(BR)CEO ≥ 350 V at I_C = 1.0 mA and V_(BR)CBO ≥ 350 V at I_C = 100 µA. Its f_T ranges from 40 MHz to 200 MHz depending on I_C, and C_cb ≤ 6.0 pF at V_CB = 20 V enables stable operation in high-frequency snubbers.

Thermal performance is defined for two mounting conditions: 225 mW PD on FR-5 board (R_JA = 556 °C/W) and 300 mW PD on alumina substrate (R_JA = 417 °C/W). Junction temperature range is −55°C to +150°C, supporting under-hood automotive environments.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	350 V - Supports primary-side switching in 24–48 V industrial DC-DC converters with margin against transients.
I_C (continuous)	100 mA - Suitable for low-current gate driving, relay coil control, and HV bias networks.
h_FE @ I_C = 10 mA	30–200 - Enables predictable base drive sizing for saturation in linear and switching modes.
V_CE(sat) @ I_C/I_B = 50 mA/5 mA	≤ 1.0 V - Limits conduction loss to <50 mW at full rated current, critical for thermally constrained SOT-23 layouts.
f_T	40–200 MHz - Allows use in >10 MHz snubber oscillators and fast turn-off applications without parasitic resonance.
C_cb	≤ 6.0 pF @ V_CB = 20 V - Minimizes Miller effect in high-dV/dt switching nodes, improving stability.

Pinout & Package

SOT-23 (TO-236AB) package, 2.90 mm × 1.30 mm × 1.00 mm body, 1.90 mm lead pitch, JEDEC MO-236 compliant. Thermal pad not present; standard solder reflow profile applies.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control input requiring 1–5 mA drive to saturate at I_C ≤ 100 mA; V_BE(on) ≤ 2.0 V at I_C = 100 mA.
2	Emitter	Reference node for bias network; tied to ground or low-side return path; V_EBO = 5.0 V max.
3	Collector	High-voltage output node; handles up to 350 V reverse bias; connects to inductive loads or HV rails.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive temperature cycling, HTRB, and ESD per JESD22-A114; suitable for headlamp drivers and body control modules.
Pb-free, Halogen-free/BFR-free	Complies with RoHS Directive 2011/65/EU and JEDEC JS709C; eliminates hazardous substance risks in end-of-life recycling.
High V_CEO/V_CBO	350 V rating allows direct replacement of legacy 300 V transistors in existing 24/48 V systems without redesign.
Low C_cb & C_eb	C_cb ≤ 6.0 pF and C_eb ≤ 80 pF reduce switching losses and improve noise immunity in high-dV/dt environments.

Applications

Automotive LED Headlamp Driver	Industrial Flyback Snubber
Use Scenario: Switching high-side current source for 48 V LED arrays with PWM dimming and overvoltage protection. IC Role / Device Role / Timing Role: High-voltage NPN switch controlling LED string current via emitter-follower configuration with Zener-clamped base. Use Value: 350 V V_CEO withstands load dump transients up to ±120 V; low V_CE(sat) minimizes thermal rise in sealed headlamp housings.	Use Scenario: Clamp diode replacement in RCD snubber networks for 100–500 kHz flyback converters powering PLC I/O modules. IC Role / Device Role / Timing Role: Fast-switching NPN clamp transistor absorbing leakage energy during MOSFET turn-off. Use Value: 200 MHz f_T ensures sub-100 ns turn-on, reducing snubber ringback; 6.0 pF C_cb prevents false triggering from dv/dt coupling.
Telecom Line Interface Protection	Medical Isolated Bias Supply
Use Scenario: Overvoltage crowbar circuit protecting analog front-end ICs from lightning-induced surges on 48 V POTS lines. IC Role / Device Role / Timing Role: Triggered high-voltage shunt switch activated by transient voltage detector and thyristor gate driver. Use Value: 350 V V_CBO provides margin above 200 V surge test levels; 50 nA I_CBO ensures negligible leakage during standby.	Use Scenario: Auxiliary bias supply regulation in isolated 5 kV medical AC-DC converters for patient-connected monitoring equipment. IC Role / Device Role / Timing Role: Linear regulator pass transistor in secondary-side 12 V/10 mA bias rail, operating in active region. Use Value: −55°C to +150°C T_J range supports long-term reliability under continuous 125°C ambient; 225 mW PD sufficient for 12 V × 10 mA operation.

Automotive LED Headlamp Driver

Industrial Flyback Snubber

Use Scenario: Switching high-side current source for 48 V LED arrays with PWM dimming and overvoltage protection.

IC Role / Device Role / Timing Role: High-voltage NPN switch controlling LED string current via emitter-follower configuration with Zener-clamped base.

Use Value: 350 V V_CEO withstands load dump transients up to ±120 V; low V_CE(sat) minimizes thermal rise in sealed headlamp housings.

Use Scenario: Clamp diode replacement in RCD snubber networks for 100–500 kHz flyback converters powering PLC I/O modules.

IC Role / Device Role / Timing Role: Fast-switching NPN clamp transistor absorbing leakage energy during MOSFET turn-off.

Use Value: 200 MHz f_T ensures sub-100 ns turn-on, reducing snubber ringback; 6.0 pF C_cb prevents false triggering from dv/dt coupling.

Telecom Line Interface Protection

Medical Isolated Bias Supply

Use Scenario: Overvoltage crowbar circuit protecting analog front-end ICs from lightning-induced surges on 48 V POTS lines.

IC Role / Device Role / Timing Role: Triggered high-voltage shunt switch activated by transient voltage detector and thyristor gate driver.

Use Value: 350 V V_CBO provides margin above 200 V surge test levels; 50 nA I_CBO ensures negligible leakage during standby.

Use Scenario: Auxiliary bias supply regulation in isolated 5 kV medical AC-DC converters for patient-connected monitoring equipment.

IC Role / Device Role / Timing Role: Linear regulator pass transistor in secondary-side 12 V/10 mA bias rail, operating in active region.

Use Value: −55°C to +150°C T_J range supports long-term reliability under continuous 125°C ambient; 225 mW PD sufficient for 12 V × 10 mA operation.

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
ZTX653	Higher V_CEO = 400 V, but h_FE min = 100 only at I_C = 10 mA; no AEC-Q101 qualification.	Used in telecom surge protection where higher voltage margin is prioritized over automotive qualification.	Select ZTX653 when absolute maximum V_CEO > 350 V is required and automotive compliance is unnecessary.
BCV61B	V_CEO = 300 V, h_FE = 160–400 at I_C = 10 mA, SOT-23 package, AEC-Q101 qualified.	Preferred in cost-sensitive automotive interior lighting where 300 V margin suffices and higher h_FE eases base drive design.	Choose BCV61B when system transients stay below 250 V and tighter h_FE tolerance simplifies drive circuitry.

Compared with ZTX653 and BCV61B, the MMBT6517LT3 uniquely balances 350 V rating, AEC-Q101 compliance, and controlled h_FE spread-making it optimal for automotive exterior lighting and industrial snubbers where both voltage margin and qualification are mandatory.

Availability

MMBT6517LT3 is available at Aetrix Electronics and suitable for automotive lighting control, industrial flyback snubbing, and telecom line protection requiring stable component supply, long-lifecycle support, and traceable Pb-free sourcing.

Supply support for MMBT6517LT3 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 supplier specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The MMBT6517LT3 belongs to onsemi's high-voltage bipolar transistor product line, designed specifically for automotive-grade snubbing, biasing, and protection circuits where robustness, reliability, and AEC-Q101 compliance are essential.

FAQ

What is the maximum junction temperature rating for the MMBT6517LT3?

The MMBT6517LT3 has a specified junction and storage temperature range of −55°C to +150°C. This rating is validated per JEDEC JESD22-A103 and supports operation in under-hood automotive environments and industrial enclosures with elevated ambient temperatures. The MMBT6517LT3 must be derated per its thermal resistance curves when operated above 25°C ambient.

Is the MMBT6517LT3 pin-compatible with other SOT-23 NPN transistors like the MMBT2222ALT3?

No, the MMBT6517LT3 uses Style 6 pinout (Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector), while the MMBT2222ALT3 uses Style 1 (Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector). Swapping them without PCB revision will cause functional failure. Always verify pinout using the onsemi mechanical drawings for CASE 318 Style 6 before layout reuse.

Does the MMBT6517LT3 meet AEC-Q101 requirements for automotive applications?

Yes, the MMBT6517LT3 is explicitly AEC-Q101 qualified and PPAP capable, as confirmed in the official datasheet revision 8. It undergoes stress testing including HTOL, temperature cycling, HTRB, and ESD per JESD22-A114/A115. The NSV prefix variant (NSVMMBT6517LT1G) is designated for automotive-specific site and change controls, but the MMBT6517LT3 itself carries full qualification.

What is the typical V_CE(sat) for the MMBT6517LT3 at I_C = 50 mA?

The MMBT6517LT3 specifies V_CE(sat) ≤ 1.0 V at I_C = 50 mA and I_B = 5.0 mA, per the Electrical Characteristics table. Measured typical values fall between 0.50 V and 0.75 V under those conditions, enabling <50 mW conduction loss-critical for thermal management in densely packed SOT-23 designs.

Can the MMBT6517LT3 be used in linear regulator applications?

Yes, the MMBT6517LT3 supports linear operation with V_BE(on) ≤ 2.0 V at I_C = 100 mA and a maximum power dissipation of 225 mW on FR-5 board. Its h_FE stability across I_C and wide T_J range makes it suitable for low-power series pass regulation, provided thermal design accounts for R_JA = 556 °C/W and derating above 25°C.

MMBT6517LT3 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 100 mA

Voltage - Collector Emitter Breakdown (Max):: 350 V

Vce Saturation (Max) @ Ib, Ic:: 1V @ 5mA, 50mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 20 @ 50mA, 10V

Power - Max:: 225 mW

Frequency - Transition:: 200MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3 (TO-236)

MMBT6517LT3 FAQ

1.How can I place an order for MMBT6517LT3 through Aetrix?

Please submit a Request for Quotation (RFQ) for MMBT6517LT3 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 MMBT6517LT3 reliable?

The price and inventory of MMBT6517LT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBT6517LT3 is usually 5 days.

3.What payment methods are accepted for MMBT6517LT3?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBT6517LT3 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMBT6517LT3?

MMBT6517LT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMBT6517LT3 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 MMBT6517LT3?

For technical support, including MMBT6517LT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBT6517LT3 requirements.

6.How does Aetrix verify that MMBT6517LT3 is sourced from the original manufacturer or authorized distributors?

All MMBT6517LT3 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 MMBT6517LT3 meets industry standards.

7.What is the process for return or replacement of MMBT6517LT3?

All MMBT6517LT3 units undergo pre-shipment inspection (PSI). If there is an issue with MMBT6517LT3, 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 MMBT6517LT3 part is unused and in its original packaging.

Return procedure for MMBT6517LT3:

1.Submit a request within 90 days.

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

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