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Diodes Incorporated FMMT591AQTA
- Part No.:
- FMMT591AQTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
FMMT591AQTA.pdf
- Description:
- TRANS PNP 40V 1A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,697
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Product details
Overview
FMMT591AQTA from Diodes Incorporated is a 40V PNP medium-power transistor in SOT23 package, rated for -1A continuous collector current and -2A peak pulse current, with VCE(sat) ≤ -500mV at -1A and Rsat = 350mΩ; used for power MOSFET gate driving and low-loss switching in automotive and industrial power control circuits.
For engineers reviewing the FMMT591AQTA datasheet, FMMT591AQTA pinout, FMMT591AQTA application, or FMMT591AQTA equivalent, key selection criteria include guaranteed BVCEO ≥ -40V, thermal resistance RθJA = 250°C/W, ESD HBM rating of 4kV, complementary pairing with FMMT491A, and AEC-Q101 readiness for automotive-grade designs.
Technical Context
This PNP bipolar junction transistor operates in linear and saturated switching modes, with hFE ranging from 30 to 800 across IC = -1mA to -2A, enabling stable current amplification in driver stages. Its ft = 150MHz supports fast switching in gate-drive applications up to ~100kHz duty-cycled loads.
The device features low VBE(sat) = -1.1V at -1A/−100mA and tight VCE(sat) distribution (−200mV to −500mV), ensuring predictable on-state loss under varying drive conditions. Thermal design is anchored by RθJC = 66°C/W and RθJL = 197°C/W, validated for solder-point heat extraction on FR-4 PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −40V: Ensures safe operation in 24V automotive and 36V industrial supply rails with margin. |
| IC (cont.) | −1A: Supports direct drive of logic-level MOSFET gates or small solenoids without external buffering. |
| VCE(sat) | ≤ −500mV @ −1A/−100mA: Limits conduction loss to ≤500mW at full load, critical for thermally constrained SOT23 layouts. |
| hFE | 30–800: Wide DC current gain range allows flexible base drive design across load currents from mA to A scale. |
| ft | 150MHz: Enables clean edge transitions in PWM gate drivers up to 100kHz with minimal delay (td = 34.9ns, tf = 62ns). |
| ESD HBM | 4000V: Provides robust handling during board assembly and in-system service without additional protection circuitry. |
| RθJA | 250°C/W: Defines maximum allowable power dissipation of 500mW at TA = +25°C on standard single-layer PCB. |
Pinout & Package
Package: SOT23 (Type DN), molded green plastic, UL 94V-0 rated, 0.008g weight, moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current source terminal for PNP operation | Connected to positive rail in high-side switch configurations; requires low-impedance return path for stable biasing. |
| 2 (Base) | Control input for minority-carrier injection | Driven low (relative to emitter) to saturate; IB ≤ −100mA required for full IC = −1A conduction. |
| 3 (Collector) | Current sink terminal | Connected to load ground or switched node; collector lead serves as primary thermal path (RθJL = 197°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Low saturation voltage | VCE(sat) ≤ −500mV at −1A ensures <0.5W conduction loss in compact SOT23 footprint. |
| High current capability | −1A continuous / −2A pulsed rating enables direct drive of power MOSFET gates without external Darlington stages. |
| Complementary pairing | FMMT491A NPN counterpart allows matched push-pull output stages with symmetrical switching behavior. |
| AEC-Q101 readiness | Manufactured in IATF 16949-certified facilities; PPAP-capable for automotive gate-driver modules requiring change control. |
| Green construction | Halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb), fully RoHS 3 compliant per EU Directive 2015/863/EU. |
Applications
| Automotive Body Control Module | Industrial PLC Output Stage |
|---|---|
Use Scenario: Driving high-side NMOS switches for door lock actuators and mirror heaters in 12V/24V vehicle systems. IC Role / Device Role / Timing Role: PNP switch providing controlled current sink to NMOS gate, enabling fast turn-on/turn-off with minimal shoot-through risk. Use Value: −40V VCEO and 4kV ESD HBM ensure reliability in noisy automotive environments; SOT23 footprint saves space in dense BCM PCB layouts. | Use Scenario: Replacing mechanical relays in programmable logic controller digital output cards for 24VDC loads. IC Role / Device Role / Timing Role: Medium-power switching element interfacing microcontroller GPIO to solenoid valves and indicator LEDs. Use Value: −1A continuous rating and 350mΩ Rsat reduce heat generation versus discrete BJT alternatives; RoHS/Green compliance meets industrial safety standards. |
| DC-DC Converter Gate Driver | Smart Sensor Power Switch |
Use Scenario: Level-shifting and amplifying PWM signals to drive high-side synchronous rectifier MOSFETs in buck converters. IC Role / Device Role / Timing Role: Fast-switching PNP stage translating logic-level control to gate-voltage swing referenced to switching node. Use Value: 150MHz ft, 34.9ns delay time, and 62ns fall time support clean gate transitions at >50kHz switching frequencies. | Use Scenario: Enabling/disabling power to MEMS pressure sensors and Hall-effect current monitors in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Low-quiescent-current power switch controlling VDD rail to sensor subsystems during sleep/wake cycles. Use Value: −100nA ICES and −100nA ICBO minimize standby leakage; SOT23 size fits ultra-compact sensor module footprints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP medium-power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZXTN25050DFHTA | Higher VCEO (−50V), lower RθJA (190°C/W), but hFE min = 100 only at −500mA | Better thermal performance in high-density layouts; less gain stability at light loads | Prefer when higher voltage margin and improved thermal dissipation outweigh gain consistency requirements |
| MMBT5401 | Lower IC (−600mA), higher VCE(sat) (−750mV @ −50mA), no AEC-Q101 qualification | Suitable for non-automotive signal switching; not rated for sustained −1A loads | Select only for cost-sensitive, non-automotive, sub-500mA applications where thermal headroom is ample |
Compared with ZXTN25050DFHTA and MMBT5401, FMMT591AQTA delivers superior combination of −1A continuous current, −40V breakdown, and AEC-Q101 readiness-making it optimal for automotive gate drivers and industrial PLC outputs where reliability and load capacity are prioritized.
Availability
FMMT591AQTA is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC output stages, DC-DC converter gate drivers, and smart sensor power switches requiring stable component supply and long-term lifecycle support.
Supply support for FMMT591AQTA 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 North America.
The FMMT series targets medium-power bipolar transistors for automotive and industrial switching applications, emphasizing AEC-Q101 qualification, thermal efficiency in SOT23, and complementary NPN/PNP pairing for robust driver design.
FAQ
What is the maximum safe operating temperature for FMMT591AQTA?
The FMMT591AQTA has an operating junction temperature range of −55°C to +150°C. At ambient temperatures above +70°C, derating is required: maximum power dissipation drops linearly from 500mW at +25°C to zero at +150°C, based on RθJA = 250°C/W. PCB layout with copper pour on collector pad improves thermal margin.
Is FMMT591AQTA pin-compatible with FMMT591ATA?
Yes-FMMT591AQTA and FMMT591ATA share identical SOT23 (Type DN) package, pinout (Emitter-Base-Collector on pins 1-2-3), and electrical specifications. The "Q" suffix denotes tape-and-reel packaging per AEC-Q200-compliant logistics; "T" suffix indicates standard tape-and-reel. Both are functionally interchangeable in circuit design.
Does FMMT591AQTA require external base resistors in gate-drive applications?
Yes-base current must be limited to prevent damage. For IC = −1A, IB ≈ −100mA is needed (hFE ≈ 10). With typical MCU GPIO output of 3.3V or 5V, a series resistor of 22Ω–47Ω (calculated as (VGPIO − |VBE(on)|)/IB) ensures safe, repeatable saturation without overdriving the base-emitter junction.
How does FMMT591AQTA's Rsat = 350mΩ impact system efficiency?
Rsat = 350mΩ directly determines conduction loss as Ploss = IC² × Rsat. At −1A, this yields 350mW loss-critical for thermal design in sealed enclosures. Compared to higher-Rsat transistors, this value reduces heatsinking needs and improves overall power stage efficiency by ~0.5–1.2% in 24V/1A switching loads.
FMMT591AQTA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 1 A
- Voltage - Collector Emitter Breakdown (Max):
- 40 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 100mA, 1A
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 300 @ 100mA, 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-23-3
FMMT591AQTA FAQ
1.How can I place an order for FMMT591AQTA through Aetrix?
Please submit a Request for Quotation (RFQ) for FMMT591AQTA 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 FMMT591AQTA reliable?
The price and inventory of FMMT591AQTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FMMT591AQTA is usually 5 days.
3.What payment methods are accepted for FMMT591AQTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FMMT591AQTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FMMT591AQTA?
FMMT591AQTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FMMT591AQTA 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 FMMT591AQTA?
For technical support, including FMMT591AQTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FMMT591AQTA requirements.
6.How does Aetrix verify that FMMT591AQTA is sourced from the original manufacturer or authorized distributors?
All FMMT591AQTA 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 FMMT591AQTA meets industry standards.
7.What is the process for return or replacement of FMMT591AQTA?
All FMMT591AQTA units undergo pre-shipment inspection (PSI). If there is an issue with FMMT591AQTA, 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 FMMT591AQTA part is unused and in its original packaging.
Return procedure for FMMT591AQTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
FMMT591AQTA Tags
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Diodes Incorporated
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Diodes Incorporated
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