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Diodes Incorporated FMMT591TA
- Part No.:
- FMMT591TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
FMMT591TA.pdf
- Description:
- TRANS PNP 60V 1A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:25,307
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Product details
Overview
FMMT591TA from Diodes Incorporated is a 60V PNP medium-power transistor in SOT23 package, rated for -1A continuous collector current and -2A peak pulse current, with VCE(sat) = -295mV at IC = -1A/IB = -100mA and hFE = 155 at IC = -1A - used in automotive load switching, industrial power control, and DC-DC converter bias circuits.
For engineers reviewing the FMMT591TA datasheet, FMMT591TA pinout, FMMT591TA application, or FMMT591TA equivalent, key selection criteria include guaranteed VCEO = -60V, low Rsat performance under high-current saturation, thermal resistance RθJA = 250°C/W on standard FR-4, AEC-Q101-compliant variant (FMMT591Q), and complementary NPN pairing with FMMT491.
Technical Context
This PNP bipolar junction transistor operates in linear and saturated switching modes, with BVCEO = -60V and VEBO = -7V enabling robust reverse-bias tolerance in high-side switch configurations. Its hFE remains characterized up to -2A, supporting stable gain in high-current drive stages.
VCE(sat) of -295mV at IC = -1A/IB = -100mA and fT = 150MHz confirm suitability for medium-speed switching (≤500kHz) and analog amplification in feedback paths, while RθJL = 197°C/W supports localized thermal management via collector lead soldering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -60V - Ensures safe operation in 48V automotive and industrial bus applications with margin against transients. |
| IC (cont.) | -1A - Supports sustained load switching in relay drivers and power supply enable circuits without derating at +25°C. |
| VCE(sat) | -295mV @ IC=-1A/IB=-100mA - Limits conduction loss to ≤295mW per device in saturated switch mode. |
| hFE | 155 @ IC=-1A - Enables reliable base drive design with ≤6.5mA required for full turn-on at 1A collector current. |
| fT | 150MHz - Permits use in high-gain pre-amplifier stages and fast-switching PWM control loops up to ~10MHz bandwidth. |
| RθJA | 250°C/W - Requires ≥15mm×15mm 1oz copper pad for full 500mW power dissipation in still air. |
| ESD HBM | 4kV - Meets JEDEC Class 3A for handling robustness in automated assembly and field-replaceable modules. |
Pinout & Package
Package: SOT23 - surface-mount plastic case, 0.008g weight, UL 94V-0 rated, moisture sensitivity level 1, matte tin-plated leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current source terminal | Connected to positive rail in high-side switch; must handle full load current and reverse-bias voltage up to -7V. |
| 2 (Base) | Control input | Receives negative current to turn on; requires -100mA for full saturation at -1A collector current. |
| 3 (Collector) | Current sink terminal | Connected to load; carries -1A continuously and dissipates heat directly to PCB via thermal pad (RθJL = 197°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed VCEO > -60V | Validated minimum breakdown ensures reliability in 48V systems with ±20% supply variation and load-dump transients. |
| Low VCE(sat) at high IC | -295mV at -1A enables <0.3W conduction loss, reducing thermal stress in space-constrained SOT23 layouts. |
| hFE characterized to -2A | Gain stability up to peak pulse current supports consistent switching timing in overcurrent protection circuits. |
| Complementary NPN pairing | FMMT491 shares identical SOT23 footprint and matching gain/breakdown specs for push-pull and H-bridge designs. |
| AEC-Q101 qualified variant | FMMT591Q available for automotive applications requiring PPAP, change control, and IATF 16949 manufacturing. |
Applications
| Automotive Body Control Module | Industrial PLC Output Stage |
|---|---|
Use Scenario: Driving solenoids and LED arrays in door lock actuators and interior lighting. IC Role / Device Role / Timing Role: High-side PNP switch controlling 12V/24V loads with fast turn-off via base pull-up. Use Value: VCEO = -60V withstands ISO 7637-2 load dump spikes; low VCE(sat) minimizes self-heating in sealed enclosures. |
Use Scenario: Isolating microcontroller GPIO from 24V DC output channels in programmable logic controllers. IC Role / Device Role / Timing Role: Level-shifting interface transistor enabling 3.3V MCU control of industrial sensors and actuators. Use Value: hFE = 155 ensures single-stage drive without external buffer; SOT23 footprint allows dense channel packing. |
| DC-DC Converter Bias Circuit | Power Supply Enable Switch |
Use Scenario: Providing bias current to error amplifier and reference in isolated flyback converters. IC Role / Device Role / Timing Role: Linear-mode current source delivering stable 10–100mA to IC bias pins. Use Value: fT = 150MHz supports stable loop response; low leakage (ICBO < 1nA) prevents reference drift. |
Use Scenario: Enabling/disabling auxiliary rails (e.g., 5V standby, 3.3V core) in multi-rail AC-DC supplies. IC Role / Device Role / Timing Role: Low-leakage, high-voltage PNP switch placed between input rail and LDO input. Use Value: ICES < 1nA at -50V VCE prevents standby current drain; RθJA = 250°C/W allows direct PCB thermal relief. |
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 |
|---|---|---|---|
| ZTX653 | VCEO = -60V, IC = -1A, but VCE(sat) = -500mV @ -1A - 70% higher conduction loss. | Limited to lower-duty-cycle switching due to higher thermal rise; not AEC-Q101 qualified. | Choose only if footprint compatibility with legacy Zetex designs is mandatory and thermal budget permits. |
| MMBT5401 | VCEO = -60V, IC = -600mA - 40% lower continuous current rating; hFE drops to 60 at -500mA. | Suitable for signal-level switching only; cannot sustain 1A loads without significant derating. | Select when board space is constrained and load current remains ≤600mA; verify gain stability at operating point. |
Compared with ZTX653 and MMBT5401, FMMT591TA delivers superior thermal efficiency at 1A, validated high-current hFE, and automotive-grade qualification path - making it optimal for industrial and automotive power interface designs demanding reliability at full rated current.
Availability
FMMT591TA is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC outputs, and DC-DC converter bias circuits requiring stable component supply across production lifecycles.
Supply support for FMMT591TA 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 distribution operations across Asia, Europe, and the Americas.
FMMT591TA belongs to Diodes' FMMT series of medium-power SOT23 transistors engineered for high-reliability industrial and automotive power interface applications where compact size, guaranteed parametric performance, and thermal robustness are critical.
FAQ
What is the maximum allowable collector-emitter voltage for FMMT591TA in continuous operation?
The absolute maximum VCEO is -60V at TA = +25°C, verified per DS33104 Rev. 9-2. Derating is required above +25°C: linear reduction to -40V at +125°C ambient, based on RθJA = 250°C/W and PD = 500mW limit. Operation beyond -60V risks avalanche failure even with current limiting.
Can FMMT591TA replace FMMT591TC in a production design?
Yes - both share identical electrical specifications and SOT23 package. The only difference is packaging: FMMT591TA ships in 3,000-unit 7-inch reels with 8mm tape width, while FMMT591TC uses 10,000-unit 13-inch reels. No layout, thermal, or circuit changes are needed for substitution.
Is FMMT591TA suitable for linear amplification applications?
Yes - its fT = 150MHz, hFE = 155 at -1A, and low leakage (ICBO < 1nA) support stable small-signal and medium-power linear operation. However, thermal derating must be applied: max PD = 500mW limits usable output swing in Class-A stages without heatsinking.
Does FMMT591TA meet RoHS and halogen-free requirements?
Yes - it is fully RoHS 3 compliant (2015/863/EU), lead-free, and "Green" per Diodes' definition: Br < 900ppm, Cl < 900ppm (Br+Cl < 1500ppm), and Sb < 1000ppm. Compliance is documented in DS33104 and certified per IATF 16949 manufacturing standards.
FMMT591TA 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):
- 60 V
- Vce Saturation (Max) @ Ib, Ic:
- 350mV @ 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-23-3
FMMT591TA FAQ
1.How can I place an order for FMMT591TA through Aetrix?
Please submit a Request for Quotation (RFQ) for FMMT591TA 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 FMMT591TA reliable?
The price and inventory of FMMT591TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FMMT591TA is usually 5 days.
3.What payment methods are accepted for FMMT591TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FMMT591TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FMMT591TA?
FMMT591TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FMMT591TA 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 FMMT591TA?
For technical support, including FMMT591TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FMMT591TA requirements.
6.How does Aetrix verify that FMMT591TA is sourced from the original manufacturer or authorized distributors?
All FMMT591TA 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 FMMT591TA meets industry standards.
7.What is the process for return or replacement of FMMT591TA?
All FMMT591TA units undergo pre-shipment inspection (PSI). If there is an issue with FMMT591TA, 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 FMMT591TA part is unused and in its original packaging.
Return procedure for FMMT591TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
FMMT591TA Tags
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