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

onsemi TIP127

Name: TIP127
Brand: onsemi
SKU: TIP127
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TIP127

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: TIP127.pdf

Description:: TRANS PNP DARL 100V 5A TO-220

Quantity:: RFQ Add To RFQ list

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Product details

Overview

TIP127 from ON Semiconductor is a PNP epitaxial Darlington transistor designed for medium-power linear and switching applications, featuring -100 V collector-emitter sustaining voltage (V_CEO(sus)), -5 A DC collector current (I_C), and -4 V saturation voltage at -5 A/-20 mA drive. It operates in TO-220 package with integrated base-emitter resistors (8 kΩ and 0.12 kΩ) and is commonly used in high-current relay drivers and motor control circuits.

For engineers reviewing the TIP127 datasheet, pinout, applications, or equivalent options, key selection criteria include its PNP Darlington architecture, -100 V V_CEO(sus), thermal derating behavior above 25°C case temperature, and compatibility with complementary NPN devices like TIP122 in H-bridge designs.

Technical Context

The TIP127 integrates two PNP transistors in Darlington configuration with on-chip base-emitter resistors to simplify biasing and improve turn-off speed. Its internal structure enables high DC current gain (h_FE ≥ 1000 at I_C = -0.5 A and -3 A) while maintaining robust safe operating area up to 65 W at T_C = 25°C.

It is rated for junction temperatures up to 150°C and exhibits low leakage: ICEO ≤ -2 mA at V_CE = -50 V and ICBO ≤ -1 mA at V_CB = -100 V. Output capacitance (C_ob) is 300 pF at V_CB = -10 V, f = 0.1 MHz.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO(sus)	-100 V - Sustaining voltage defines maximum off-state collector-emitter blocking capability under active drive conditions
I_C (DC)	-5 A - Continuous collector current rating determines maximum steady-state load switching capacity
V_CE(sat)	-4 V at I_C = -5 A, I_B = -20 mA - Saturation voltage directly impacts conduction loss and heat generation in switching mode
h_FE	≥1000 at V_CE = -3 V, I_C = -3 A - High DC gain reduces required base drive current and simplifies driver stage design
P_C (T_C = 25°C)	65 W - Maximum power dissipation at case temperature of 25°C sets heatsink sizing baseline
R_θJC	1.92 °C/W - Junction-to-case thermal resistance governs temperature rise per watt under heatsink-mounted conditions

Pinout & Package

Package: TO-220 3L (Single Gauge), through-hole, vertical mounting with metal tab electrically connected to collector. Standard JEDEC AB outline with 2.54 mm lead pitch.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Control input terminal	Receives base current to initiate conduction; internally connected to 8 kΩ resistor to emitter and 0.12 kΩ resistor to second transistor base
2 (Collector)	High-current output node	Connected to metal tab; must be electrically isolated from heatsink unless common-collector topology is intended
3 (Emitter)	Power return path	Serves as reference for load connection; tied to internal first transistor emitter and second transistor base via resistor network

Key Features

Feature	Design Value
Integrated base-emitter resistors	8 kΩ and 0.12 kΩ enable single-resistor biasing and reduce external component count in driver circuits
High DC current gain	h_FE ≥ 1000 across I_C = -0.5 A to -3 A ensures stable switching with minimal base drive overhead
Robust safe operating area	Rated for 65 W at T_C = 25°C with defined derating curve supports reliable operation in pulsed and linear modes
Complementary NPN pairing	Designed as PNP counterpart to TIP122 (-100 V, -5 A NPN), enabling matched performance in push-pull and H-bridge topologies

Applications

Industrial Relay Drivers	DC Motor Reversing Circuits
Use Scenario: Driving 24–48 V industrial relays requiring >3 A coil current with TTL/CMOS-compatible input logic. IC Role / Device Role / Timing Role: High-current PNP switch controlling relay coil ground path in low-side configuration. Use Value: Integrated base resistors eliminate need for external bias components; -100 V V_CEO(sus) accommodates inductive kickback without snubber.	Use Scenario: Bidirectional 12–24 V brushed DC motor control in automation systems using discrete H-bridge. IC Role / Device Role / Timing Role: Upper-leg PNP switch in complementary pair with TIP122 to form one half-bridge leg. Use Value: Matched -100 V rating and -5 A current capability with TIP122 ensure symmetrical conduction and switching characteristics.
Linear Regulator Pass Elements	High-Current LED Dimming
Use Scenario: Series pass element in adjustable linear regulators delivering up to 4 A at 5–15 V output. IC Role / Device Role / Timing Role: Voltage-controlled current source operating in active region with external feedback loop. Use Value: High h_FE minimizes base drive error current; 150°C max junction temperature supports thermally constrained enclosures.	Use Scenario: Constant-current dimming of high-brightness LED strings in signage and architectural lighting. IC Role / Device Role / Timing Role: Low-frequency PWM-controlled current sink in emitter-follower configuration. Use Value: -4 V V_CE(sat) at -5 A enables efficient operation with minimal headroom voltage drop across the device.

Industrial Relay Drivers

DC Motor Reversing Circuits

Use Scenario: Driving 24–48 V industrial relays requiring >3 A coil current with TTL/CMOS-compatible input logic.

IC Role / Device Role / Timing Role: High-current PNP switch controlling relay coil ground path in low-side configuration.

Use Value: Integrated base resistors eliminate need for external bias components; -100 V V_CEO(sus) accommodates inductive kickback without snubber.

Use Scenario: Bidirectional 12–24 V brushed DC motor control in automation systems using discrete H-bridge.

IC Role / Device Role / Timing Role: Upper-leg PNP switch in complementary pair with TIP122 to form one half-bridge leg.

Use Value: Matched -100 V rating and -5 A current capability with TIP122 ensure symmetrical conduction and switching characteristics.

Linear Regulator Pass Elements

High-Current LED Dimming

Use Scenario: Series pass element in adjustable linear regulators delivering up to 4 A at 5–15 V output.

IC Role / Device Role / Timing Role: Voltage-controlled current source operating in active region with external feedback loop.

Use Value: High h_FE minimizes base drive error current; 150°C max junction temperature supports thermally constrained enclosures.

Use Scenario: Constant-current dimming of high-brightness LED strings in signage and architectural lighting.

IC Role / Device Role / Timing Role: Low-frequency PWM-controlled current sink in emitter-follower configuration.

Use Value: -4 V V_CE(sat) at -5 A enables efficient operation with minimal headroom voltage drop across the device.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP Darlington transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD127G	TO-263 surface-mount package; identical -100 V/-5 A ratings and Darlington structure but lower R_θJC (1.5°C/W)	Requires PCB rework for SMT assembly; better thermal performance in space-constrained layouts	Select MJD127G when board space is limited and thermal management favors SMT heatsinking
TIP147	Higher power rating: 125 W at T_C = 25°C; same TO-220 package but larger die and higher I_C = -10 A	Over-spec'd for most TIP127 use cases; introduces unnecessary cost and thermal mass in standard 5 A designs	Select TIP147 only when sustained >6 A loads or extended SOA margin is required

Compared with MJD127G and TIP147, the TIP127 provides optimal balance of through-hole manufacturability, thermal capability, and cost for medium-power PNP switching up to 5 A - neither over-engineered nor thermally marginal.

Availability

TIP127 is available at Aetrix Electronics and suitable for industrial relay drivers, DC motor reversing circuits, and linear regulator pass elements requiring stable component supply and long-term production continuity.

Supply support for TIP127 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

ON Semiconductor is a global semiconductor manufacturer specializing in power management, analog, sensor, and connectivity solutions for automotive, industrial, and cloud power applications.

The TIP127 belongs to ON Semiconductor's legacy power bipolar transistor portfolio, originally developed by Fairchild Semiconductor to deliver rugged, cost-effective Darlington switching for industrial control and power conversion.

FAQ

What is the maximum continuous collector current rating for the TIP127?

The TIP127 has a maximum DC collector current (I_C) rating of -5 A at T_C = 25°C. This value decreases with rising case temperature per the published derating curve. Operation above this limit risks thermal runaway or permanent damage, especially without adequate heatsinking. The TIP127 datasheet specifies pulse current (I_CP) up to -8 A under defined test conditions (pulse width ≤ 300 μs, duty cycle ≤ 2%).

Does the TIP127 require an external base resistor when driven from a microcontroller GPIO?

Yes - although the TIP127 includes internal base-emitter resistors (8 kΩ and 0.12 kΩ), an external series base resistor is still required to limit peak base current and prevent latch-up or excessive power dissipation in the input stage. For a 5 V MCU driving the TIP127 with I_B = -20 mA target, a 150 Ω resistor is typical. The TIP127's internal resistors simplify biasing but do not eliminate the need for controlled base drive.

How does the TIP127 compare to the TIP125 and TIP126 in terms of voltage rating?

The TIP127 differs from the TIP125 and TIP126 solely in its voltage ratings: TIP127 has -100 V V_CEO(sus) and V_CBO, whereas TIP125 is rated for -60 V and TIP126 for -80 V. All three share identical package (TO-220), current rating (-5 A), gain (h_FE ≥ 1000), and internal resistor values. The TIP127 is selected when system-level transient voltages exceed -80 V, such as in 48 V industrial bus applications with inductive loads.

Can the TIP127 be used as a direct replacement for the TIP147 in existing designs?

No - the TIP127 is not a direct replacement for the TIP147. While both are PNP Darlington transistors in TO-220 packages, the TIP147 supports -10 A DC current and 125 W dissipation versus the TIP127's -5 A and 65 W. Substituting TIP127 for TIP147 in a 8 A load will cause thermal overload and premature failure. The TIP127 may only replace TIP147 in applications where actual load current remains ≤ 4 A with sufficient heatsinking margin.

What is the purpose of the internal 0.12 kΩ resistor in the TIP127's Darlington structure?

The 0.12 kΩ resistor connects the emitter of the first transistor to the base of the second transistor within the TIP127's Darlington pair. It provides a defined discharge path during turn-off, reducing storage time and improving switching speed compared to discrete Darlington configurations. This resistor helps mitigate secondary breakdown risk during fast transitions and contributes to the TIP127's specified safe operating area. Its value is fixed and not user-adjustable.

TIP127 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: PNP - Darlington

Current - Collector (Ic) (Max):: 5 A

Voltage - Collector Emitter Breakdown (Max):: 100 V

Vce Saturation (Max) @ Ib, Ic:: 4V @ 20mA, 5A

Current - Collector Cutoff (Max):: 500µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 1000 @ 3A, 3V

Power - Max:: 2 W

Frequency - Transition:: -

Operating Temperature:: -65°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

TIP127 FAQ

1.How can I place an order for TIP127 through Aetrix?

Please submit a Request for Quotation (RFQ) for TIP127 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 TIP127 reliable?

The price and inventory of TIP127 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TIP127 is usually 5 days.

3.What payment methods are accepted for TIP127?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TIP127 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TIP127?

TIP127 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TIP127 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 TIP127?

For technical support, including TIP127 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TIP127 requirements.

6.How does Aetrix verify that TIP127 is sourced from the original manufacturer or authorized distributors?

All TIP127 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 TIP127 meets industry standards.

7.What is the process for return or replacement of TIP127?

All TIP127 units undergo pre-shipment inspection (PSI). If there is an issue with TIP127, 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 TIP127 part is unused and in its original packaging.

Return procedure for TIP127:

1.Submit a request within 90 days.

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

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