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

Diodes Incorporated ZUMT591TC

Name: ZUMT591TC
Brand: Diodes Incorporated
SKU: ZUMT591TC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZUMT591TC

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

Package:: SC-70, SOT-323

Datasheet:: ZUMT591TC.pdf

Description:: TRANS PNP 60V 1A SOT-323

Quantity:: RFQ Add To RFQ list

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Inventory:6,385

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Product details

Overview

ZUMT591TC from Zetex Semiconductors is a PNP silicon planar transistor in SOT323 package, rated for -1 A continuous collector current, -60 V V_CEO, and 500 mW power dissipation, with V_CE(sat) as low as -0.3 V at I_C = -500 mA / I_B = -50 mA; used in compact DC-DC converter switching stages and low-voltage load switching.

For engineers reviewing the ZUMT591TC datasheet, ZUMT591TC pinout, ZUMT591TC application, or ZUMT591TC equivalent, key selection criteria include verified V_CE(sat) at high I_C, h_FE consistency across 1 mA–1 A, SOT323 thermal derating behavior, and pulsed I_CM capability under 2% duty cycle.

Technical Context

This PNP bipolar junction transistor operates in active and saturation regions with guaranteed breakdown ratings: V_CBO = -80 V, V_CEO = -60 V, and V_EBO = -5 V. Its h_FE ranges from 100 (I_C = -1 mA) to 15 (I_C = -1 A), supporting both signal-level biasing and power switching.

Transition frequency f_T is 150 MHz at I_C = -50 mA / V_CE = -10 V, and output capacitance C_obo is 10 pF at V_CB = -10 V / f = 1 MHz - confirming suitability for medium-speed switching up to ~10 MHz with controlled turn-off loss.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	-60 V - maximum safe collector-emitter voltage before avalanche conduction in common-emitter configuration
I_C (cont.)	-1 A - continuous DC current handling capacity at T_amb = 25°C, derates linearly above 25°C
V_CE(sat)	-0.3 V (typ.) at I_C = -500 mA / I_B = -50 mA - enables <150 mW saturation loss in high-current switch mode
h_FE	15 (min.) at I_C = -1 A / V_CE = -5 V - ensures reliable base drive margin for 10:1 I_C:I_B ratio in saturated switch design
P_tot	500 mW - total package power dissipation limit at T_amb = 25°C, requiring thermal pad or airflow above 70°C ambient
f_T	150 MHz - usable for switching frequencies up to ~10 MHz with acceptable gain roll-off and timing predictability

Pinout & Package

SOT323 surface-mount plastic package with gull-wing leads; 1.3 mm × 2.1 mm footprint, 0.95 mm height, and JEDEC MO-203-DA compliant outline.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Connected to higher potential rail in high-side switch; sets reference for V_BE bias and thermal path
2 (Base)	Control input	Receives negative current to forward-bias BE junction; requires ≥100 mA drive for full saturation at I_C = -1 A
3 (Collector)	Output current path	Connected to load return; carries full switched current and must be routed with low-inductance trace for fast turn-off

Key Features

Feature	Design Value
Ultra-low V_CE(sat)	-0.3 V typ. at I_C = -500 mA reduces conduction loss by >40% vs. standard PNP transistors in 5 V rail switches
High I_CM	-2 A peak pulse rating enables short-duration surge handling (300 µs, 2% duty) in motor start or inrush limiting
Wide T_j range	-55°C to +150°C operation supports automotive under-hood and industrial control cabinet deployment without derating
Stable h_FE curve	h_FE ≥15 at I_C = -1 A ensures predictable base drive sizing across production lots and temperature

Applications

DC-DC Converter Switch

Low-Voltage Load Switch

Use Scenario: High-efficiency buck converter top switch in 3.3 V/5 V systems with synchronous rectification.

IC Role / Device Role / Timing Role: PNP high-side switch controlling energy transfer into inductor; driven by complementary logic-level gate driver.

Use Value: Low V_CE(sat) minimizes dropout and improves light-load efficiency; SOT323 footprint saves board space in portable power modules.

Use Scenario: Power enable/disable for USB peripheral rails or sensor sub-circuits in battery-powered IoT nodes.

IC Role / Device Role / Timing Role: Discrete high-side switch replacing PMOS, controlled by microcontroller GPIO with inverted logic.

Use Value: -1 A rating supports multiple peripherals; tight V_CE(sat) tolerance ensures consistent rail drop across units and temperatures.

Automotive Body Control

Industrial Signal Conditioning

Use Scenario: Lamp dimming and LED driver current sink in vehicle interior lighting modules.

IC Role / Device Role / Timing Role: Linear or PWM-controlled current source in constant-current LED string configuration.

Use Value: -60 V V_CEO withstands load dump transients; -55°C to +150°C rating meets AEC-Q101 stress test requirements.

Use Scenario: Level-shifting interface between 3.3 V MCU and -5 V analog front-end in precision data acquisition systems.

IC Role / Device Role / Timing Role: Inverting level translator with defined h_FE and low C_obo to preserve signal edge integrity.

Use Value: 150 MHz f_T supports clean 1–5 MHz clock/data translation; 10 pF C_obo limits capacitive loading on driving node.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ZXTN25050DFH	PNP, SOT23, V_CEO = -50 V, I_C = -0.5 A, V_CE(sat) = -0.25 V @ -300 mA	Lower voltage/current rating; better V_CE(sat) at light loads only	Select when board space allows SOT23 and system V_CC ≤ 36 V
MMBT591	PNP, SOT23, V_CEO = -60 V, I_C = -1 A, V_CE(sat) = -0.5 V @ -500 mA	Higher V_CE(sat) increases conduction loss by ~70 mW at full load	Choose if legacy SOT23 footprint compatibility is required over efficiency

Compared with ZUMT591TC, ZXTN25050DFH trades voltage headroom for lower saturation loss at sub-500 mA, while MMBT591 matches voltage/current specs but sacrifices 0.2 V in V_CE(sat), directly increasing thermal load in compact enclosures.

Availability

ZUMT591TC is available at Aetrix Electronics and suitable for DC-DC converters, automotive body electronics, and industrial signal conditioning requiring stable component supply and consistent parametric performance across production batches.

Supply support for ZUMT591TC 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

Zetex Semiconductors plc (now part of Diodes Incorporated) was a UK-based designer of high-performance discrete semiconductors, focused on analog and power-efficient signal conditioning components.

ZUMT591TC belongs to Zetex's ultra-low-saturation PNP transistor family, engineered specifically for space-constrained, high-reliability switching in portable and automotive power systems.

FAQ

What is the maximum allowable base current for continuous operation?

The absolute maximum base current is -200 mA per the Absolute Maximum Ratings table. For reliable continuous operation at I_C = -1 A, base current should be limited to -100 mA to maintain safe junction temperature and avoid secondary breakdown. Derating is required above 25°C ambient.

Does ZUMT591TC meet AEC-Q101 qualification standards?

ZUMT591TC is not AEC-Q101 qualified per official Diodes Incorporated documentation. While its -55°C to +150°C operating range and -60 V V_CEO support automotive environments, formal qualification testing (e.g., HTSL, TC, AC/DC life test) was not performed on this specific variant.

Can ZUMT591TC replace an NPN transistor in a circuit?

No - ZUMT591TC is a PNP device with opposite polarity and current flow direction. It cannot directly substitute for an NPN transistor without inverting biasing, swapping supply connections, and revalidating timing and saturation behavior. Circuit redesign is required.

What is the thermal resistance from junction to ambient (R_θJA) for SOT323 mounting?

R_θJA is not specified in the draft datasheet. Based on JEDEC JESD51-2A test conditions (single-layer 1 in² copper pad), typical R_θJA for SOT323 PNP transistors is 350–400°C/W. For production designs, thermal simulation or empirical measurement under actual PCB layout is required.

ZUMT591TC Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: SC-70, SOT-323

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 1 A

Voltage - Collector Emitter Breakdown (Max):: 60 V

Vce Saturation (Max) @ Ib, Ic:: 600mV @ 100mA, 1A

Current - Collector Cutoff (Max):: 100nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 500mA, 5V

Power - Max:: 500 mW

Frequency - Transition:: 150MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-323

ZUMT591TC FAQ

1.How can I place an order for ZUMT591TC through Aetrix?

Please submit a Request for Quotation (RFQ) for ZUMT591TC 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 ZUMT591TC reliable?

The price and inventory of ZUMT591TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZUMT591TC is usually 5 days.

3.What payment methods are accepted for ZUMT591TC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZUMT591TC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZUMT591TC?

ZUMT591TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZUMT591TC 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 ZUMT591TC?

For technical support, including ZUMT591TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZUMT591TC requirements.

6.How does Aetrix verify that ZUMT591TC is sourced from the original manufacturer or authorized distributors?

All ZUMT591TC 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 ZUMT591TC meets industry standards.

7.What is the process for return or replacement of ZUMT591TC?

All ZUMT591TC units undergo pre-shipment inspection (PSI). If there is an issue with ZUMT591TC, 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 ZUMT591TC part is unused and in its original packaging.

Return procedure for ZUMT591TC:

1.Submit a request within 90 days.

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

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