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Diodes Incorporated ZXTR2108FQ-7
- Part No.:
- ZXTR2108FQ-7
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ZXTR2108FQ-7.pdf
- Description:
- IC REG LINEAR 8V 40MA SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:13,709
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Product details
Overview
ZXTR2108FQ from Diodes Incorporated is a monolithic 8V ±10% linear regulator transistor in SOT23, integrating an emitter-follower transistor, zener diode, and bias resistor. It delivers 15mA regulated output across 10–60V input range and is AEC-Q101 qualified for automotive 24V-to-8V rail conversion.
For engineers reviewing the ZXTR2108FQ datasheet, ZXTR2108FQ pinout, ZXTR2108FQ application, or ZXTR2108FQ equivalent, key selection criteria include input voltage range (10–60V), output tolerance (±10%), quiescent current (260–6000 µA), thermal resistance (200 °C/W), and AEC-Q101 qualification for under-hood automotive use.
Technical Context
The ZXTR2108FQ implements a series linear regulator using an emitter-follower topology with internal zener-based reference and fixed resistor biasing. Regulation occurs only when VIN ≥ 10V; below that, VOUT follows VIN – 1V.
It operates as a three-terminal device (VIN, GND, VOUT) with no external feedback components required. Output stability relies on minimum 10µA load and recommended 10µF output capacitance, while input requires 1µF/80V ceramic capacitor for transient suppression.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 8V ±10% (7.2–8.8V); maintains regulation across 10–60V input at 15mA load |
| Input Voltage Range | 10–60V (regulated operation); -0.3V to 60V absolute max; <10V disables regulation |
| Continuous Output Current | 40mA @ VIN=24V; derates with higher VIN or ambient temperature per SOA curve |
| Quiescent Current | 260–6000 µA; increases with VIN, limiting efficiency in low-power standby modes |
| Line Regulation | ≤120 mV over 10–60V input; ensures stable 8V output despite battery or supply fluctuations |
| Thermal Resistance θJA | 200 °C/W (25mm×25mm 1oz Cu PCB); defines maximum power dissipation (625mW) at +25°C ambient |
| ESD Rating (HBM) | 4000 V; meets automotive-level ESD robustness without external protection |
Pinout & Package
Package: SOT23 - surface-mount plastic package with matte tin-plated leads, UL 94V-0 rating, 0.008g weight, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Supply | Accepts -0.3V to 60V; must be ≥10V for regulation; requires 1µF/80V decoupling to GND |
| GND | Power Ground | Reference node for all voltages; must connect directly to system ground plane with low impedance |
| VOUT | Voltage Output | Delivers regulated 8V; requires ≥10µA minimum load and 10µF/16V output capacitor for stability |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic integration | Replaces discrete transistor + zener + resistor solution, reducing BOM count and PCB area by >60% |
| AEC-Q101 qualification | Validated for automotive under-hood environments (-40°C to +125°C junction, PPAP capable) |
| Lead-free & green compliance | Fully RoHS-compliant, halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb) |
| Emitter-follower architecture | Provides low dropout behavior (VCE(sat) ≈ 1V), enabling regulation down to VIN = 9V for 8V output |
| Internal thermal protection | Derating curve and SOA limits prevent destructive thermal runaway during overload or high-VIN conditions |
Applications
| Body Control Module Power | Engine Control Unit Sensor Bias |
|---|---|
|
Use Scenario: Regulating 24V vehicle battery to stable 8V for microcontroller I/O peripherals and CAN transceiver logic rails. IC Role / Device Role / Timing Role: Primary linear regulator supplying clean, low-noise 8V to MCU GPIO banks and level-shifting circuitry. Use Value: Eliminates need for external pass transistor and zener, reducing component count and improving long-term reliability in vibration-prone environments. |
Use Scenario: Providing precise 8V bias to oxygen sensor heaters and knock sensor signal conditioning amplifiers. IC Role / Device Role / Timing Role: Stable voltage reference source for analog front-end circuits requiring tight DC accuracy and low drift. Use Value: ±10% output tolerance and 7.2 mV/°C tempco ensure heater current remains within ±5% across -40°C to +125°C ambient. |
| Infotainment System USB Hub | ADAS Camera Power Sequencing |
|
Use Scenario: Generating 8V rail from 12V vehicle bus to power USB 2.0 hub controllers and PHY ICs. IC Role / Device Role / Timing Role: Pre-regulator stage feeding downstream DC-DC converters, reducing input ripple and EMI susceptibility. Use Value: 45 dB PSRR at 100Hz suppresses alternator noise before it reaches sensitive USB data lines. |
Use Scenario: Sequenced 8V supply for image sensor analog core and ISP power domains in rear-view cameras. IC Role / Device Role / Timing Role: Standby regulator maintaining bias during sleep mode, enabling fast wake-up without full re-initialization. Use Value: Low 260 µA quiescent current at 12V input extends battery runtime during parking surveillance mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL783CP | Adjustable output (1.25–125V), TO-220 package, 700 mA max, no AEC-Q101 qualification | Requires external resistors for 8V setting; unsuitable for space-constrained automotive PCBs | Use only in non-automotive industrial designs where adjustability and higher current outweigh size and qualification needs |
| LM2931AZ-8.0 | Fixed 8V LDO, TO-92/SOIC, 100 mA, 0.6V dropout, AEC-Q100 grade (not Q101) | Lower dropout enables operation down to 8.6V input; lacks 60V input capability and integrated zener reference | Select when input stays near 12V and ultra-low dropout is critical; avoid in 24V+ systems or where high-voltage transients occur |
Compared with TL783CP and LM2931AZ-8.0, the ZXTR2108FQ uniquely combines 60V input tolerance, SOT23 footprint, AEC-Q101 qualification, and monolithic integration-making it the only drop-in solution for compact, high-reliability 24V-to-8V regulation in automotive ECUs.
Availability
ZXTR2108FQ is available at Aetrix Electronics and suitable for automotive body control modules, engine management systems, and ADAS camera power supplies requiring stable component supply, AEC-Q101 compliance, and SOT23 space efficiency.
Supply support for ZXTR2108FQ 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, specializing in high-reliability power management, signal integrity, and protection solutions for automotive, industrial, and consumer markets.
The ZXTR2108FQ belongs to Diodes' automotive-grade linear regulator transistor family, designed specifically to replace discrete zener-transistor regulators in harsh-environment 12V/24V/48V vehicle subsystems.
FAQ
What is the minimum load required for regulation?
The ZXTR2108FQ requires a minimum load of 10µA on VOUT to maintain regulation. Below this threshold, output voltage may rise above 8V due to insufficient bias current through the internal zener. A 100kΩ pull-down resistor ensures compliance across temperature and input voltage ranges.
Can ZXTR2108FQ operate with 12V input?
Yes-ZXTR2108FQ operates with 12V input and delivers regulated 8V output at up to 40mA. At 12V, power dissipation is ~160mW (4V × 40mA), well within the 625mW limit on a 25mm×25mm copper pad, enabling reliable operation without heatsinking.
Is external capacitor mandatory on VOUT?
Yes-a minimum 10µF/16V ceramic or tantalum capacitor is required on VOUT to ensure loop stability and transient response. Without it, the device exhibits oscillation under load steps, especially with capacitive loads exceeding 1nF.
Does ZXTR2108FQ have reverse polarity protection?
No-the device lacks internal reverse-polarity protection. Applying negative voltage to VIN relative to GND beyond -0.3V risks permanent damage. External protection (e.g., series Schottky diode) is required in systems prone to battery reversal or jump-start conditions.
ZXTR2108FQ-7 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
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 40mA
- Current - Quiescent (Iq):
- 500 µA
- Current - Supply (Max):
- 6 mA
- PSRR:
- 45dB (100Hz)
- Control Features:
- -
- Protection Features:
- -
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
ZXTR2108FQ-7 FAQ
1.How can I place an order for ZXTR2108FQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXTR2108FQ-7 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 ZXTR2108FQ-7 reliable?
The price and inventory of ZXTR2108FQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXTR2108FQ-7 is usually 5 days.
3.What payment methods are accepted for ZXTR2108FQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXTR2108FQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXTR2108FQ-7?
ZXTR2108FQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXTR2108FQ-7 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 ZXTR2108FQ-7?
For technical support, including ZXTR2108FQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXTR2108FQ-7 requirements.
6.How does Aetrix verify that ZXTR2108FQ-7 is sourced from the original manufacturer or authorized distributors?
All ZXTR2108FQ-7 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 ZXTR2108FQ-7 meets industry standards.
7.What is the process for return or replacement of ZXTR2108FQ-7?
All ZXTR2108FQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with ZXTR2108FQ-7, 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 ZXTR2108FQ-7 part is unused and in its original packaging.
Return procedure for ZXTR2108FQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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