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Diodes Incorporated ZXTR2008Z-7
- Part No.:
- ZXTR2008Z-7
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-243AA
- Datasheet:
-
ZXTR2008Z-7.pdf
- Description:
- IC REG LINEAR 8.2V 42MA SOT89
- Quantity:
- Payment:
- Shipping:
Inventory:3,813
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Product details
Overview
ZXTR2008Z-7 from Diodes Incorporated is a monolithic high-voltage linear regulator transistor integrating an NPN emitter-follower, 8.2V Zener reference, and 150kΩ current-limiting resistor in a single SOT89 package. It delivers a regulated 8.2V ±10% output at 15mA with input voltage range of 12V–100V, and is used as a startup supply for DC-DC converters in Power over Ethernet (PoE) systems.
For engineers reviewing the ZXTR2008Z-7 datasheet, ZXTR2008Z-7 pinout, ZXTR2008Z-7 application, or ZXTR2008Z-7 equivalent, key selection criteria include its 100V max input rating, integrated quiescent current limiting, thermal performance on 15mm×15mm copper, and compatibility with PoE auxiliary power sequencing requirements.
Technical Context
The ZXTR2008Z-7 implements a series linear regulation architecture using an internal NPN emitter-follower stage biased by an integrated Zener diode and resistor network. Regulation is achieved without external feedback components, relying on fixed internal reference and pass element characteristics.
It operates across -40°C to +125°C junction temperature, supports continuous output current up to 42mA at VIN = 48V, and exhibits 38dB PSRR at 100Hz with 100nF output capacitance - enabling stable biasing in noisy high-voltage environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 8.2V ±10% - provides stable bias rail for gate drivers or controller ICs in PoE PD circuits |
| Input Voltage Range | 12V to 100V - enables direct connection to PoE midspan or endspan PSE outputs without pre-regulation |
| Quiescent Current | 275µA typ @ 48V - minimizes standby power loss in always-on auxiliary supplies |
| Power Dissipation | 1.7W max (50mm×50mm Cu) - defines thermal design margin for PCB layout under full load |
| Thermal Resistance θJA | 59°C/W - determines junction temperature rise above ambient at given power dissipation |
| PSRR | 38dB @ 100Hz - suppresses ripple from upstream DC-DC converter or rectified line input |
| ESD HBM | 4000V - ensures robustness during board handling and system integration |
Pinout & Package
Package: SOT89 - surface-mount plastic package with exposed VIN pad for thermal conduction; 0.052g mass; RoHS-compliant matte tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | High-voltage input supply | Accepts -0.3V to 100V; connects to exposed lead for thermal path; requires 1µF bypass to GND |
| GND | Power ground reference | System ground return; must be low-impedance connection for regulation stability |
| VOUT | Regulated output voltage | Delivers 8.2V when VIN ≥12V; limited to ≤VIN−1.5V below 12V; requires ≥10µA load and 10µF capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic emitter-follower regulator | Eliminates need for discrete transistor + Zener + resistor layout, reducing BOM count and footprint |
| Integrated 150kΩ bias resistor | Fixes quiescent current at ~300µA, enabling predictable thermal behavior and eliminating external bias component |
| 100V absolute max input rating | Supports direct interface with PoE Class 5/6 (up to 57V) and industrial 48V/100V bus systems |
| AEC-Q101 qualified | Validated for automotive-grade reliability, including temperature cycling and humidity testing |
| Lead-free & halogen-free | Complies with RoHS 2 and JEDEC green standards (<900ppm Br/Cl, <1000ppm Sb) |
Applications
| Power over Ethernet (PoE) PD Startup | DC-DC Converter Auxiliary Bias |
|---|---|
Use Scenario: Provides initial gate drive voltage to MOSFETs in PoE-powered device (PD) before main DC-DC starts. IC Role / Device Role / Timing Role: High-voltage linear regulator supplying clean 8.2V to controller IC and primary-side FET gate during cold-start phase. Use Value: Enables reliable turn-on of isolated flyback controllers without requiring separate high-voltage startup IC or transformer auxiliary winding. |
Use Scenario: Supplies bias to PWM controller and gate driver in offline AC-DC or isolated DC-DC converters. IC Role / Device Role / Timing Role: Regulated auxiliary supply replacing resistive dropper networks or dedicated HV startup ICs. Use Value: Reduces no-load power consumption by >50% versus resistor-based solutions while maintaining fast start-up response. |
| Telecom Line Card Power | Industrial 48V System Supervision |
Use Scenario: Powers monitoring circuitry (e.g., ADC, microcontroller, LED indicators) on telecom line cards fed from -48V or +48V backplane. IC Role / Device Role / Timing Role: High-reliability local regulator converting 48V to 8.2V for logic-level supervision functions. Use Value: Delivers stable voltage despite wide input variation and transient surges common in telecom infrastructure. |
Use Scenario: Supplies control logic in industrial PLC modules operating from unregulated 48V DC bus. IC Role / Device Role / Timing Role: Primary bias source for isolated I/O drivers and communication interfaces (RS-485, CAN). Use Value: Maintains operation during brown-out events down to 12V input, supporting graceful shutdown protocols. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL783CP | Adjustable output (1.25V–125V), higher dropout, no integrated Zener/resistor - requires external components | Used where programmable output or higher current (>70mA) is needed; less compact than ZXTR2008Z-7 | Select TL783CP only if adjustable output or >42mA continuous load is required; adds design complexity and board area |
| LT3080IMSE#PBF | Adjustable current-source-based LDO, 1.2V–36V input, 1.2A max, requires external SET resistor and compensation | Suitable for low-noise, high-PSRR applications with lower input voltage; not rated for >40V input | Choose LT3080 only for sub-36V systems needing ultra-low noise or precise current-mode regulation; incompatible with 100V PoE use cases |
Compared with TL783CP and LT3080IMSE#PBF, the ZXTR2008Z-7 offers lowest component count and smallest footprint for fixed 8.2V regulation from 12–100V inputs, with built-in thermal protection and AEC-Q101 qualification - making it optimal for space-constrained PoE and telecom auxiliary supplies.
Availability
ZXTR2008Z-7 is available at Aetrix Electronics and suitable for Power over Ethernet (PoE) PD designs, telecom line card power management, and industrial 48V system supervision requiring stable component supply and long-term lifecycle support.
Supply support for ZXTR2008Z-7 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 devices for industrial, automotive, and communications markets.
The ZXTR2008Z-7 belongs to Diodes' high-voltage regulator transistor product line, designed specifically to replace multi-component discrete solutions in PoE, telecom, and industrial auxiliary power applications.
FAQ
What is the minimum input voltage required for regulation?
The ZXTR2008Z-7 requires a minimum input voltage of 12V to maintain regulated 8.2V output. Below 12V, VOUT follows VIN minus ~1.5V drop. This threshold ensures sufficient headroom for the internal emitter-follower stage to operate in active mode with adequate Zener bias current.
Can ZXTR2008Z-7 drive a 30mA load continuously?
Yes - at VIN = 48V and TA = +25°C, the ZXTR2008Z-7 supports up to 42mA continuous output current. At higher input voltages or elevated ambient temperatures, derating applies per the Safe Operating Area curve in the datasheet; for 30mA at 100V input, ensure PCB copper area meets 50mm×50mm 1oz specification.
Is an output capacitor required, and what value is recommended?
Yes - a minimum 10µF ceramic or tantalum capacitor is required between VOUT and GND to ensure stability and transient response. The datasheet recommends ≥10µA minimum load current and notes that output capacitance improves load regulation and reduces output impedance at high frequencies.
How does the 150kΩ internal resistor affect system design?
The 150kΩ resistor sets the Zener bias current and thus the quiescent current (~300µA at 48V). It eliminates the need for an external bias network, simplifies layout, and ensures consistent thermal behavior. Designers must account for its fixed power dissipation (≈23mW at 48V) in total thermal budget calculations.
ZXTR2008Z-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-243AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 100V
- Voltage - Output (Min/Fixed):
- 8.2V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 42mA
- Current - Quiescent (Iq):
- 500 µA
- Current - Supply (Max):
- 900 µA
- PSRR:
- 38dB (100Hz)
- Control Features:
- -
- Protection Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
ZXTR2008Z-7 FAQ
1.How can I place an order for ZXTR2008Z-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXTR2008Z-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 ZXTR2008Z-7 reliable?
The price and inventory of ZXTR2008Z-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXTR2008Z-7 is usually 5 days.
3.What payment methods are accepted for ZXTR2008Z-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXTR2008Z-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXTR2008Z-7?
ZXTR2008Z-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXTR2008Z-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 ZXTR2008Z-7?
For technical support, including ZXTR2008Z-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXTR2008Z-7 requirements.
6.How does Aetrix verify that ZXTR2008Z-7 is sourced from the original manufacturer or authorized distributors?
All ZXTR2008Z-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 ZXTR2008Z-7 meets industry standards.
7.What is the process for return or replacement of ZXTR2008Z-7?
All ZXTR2008Z-7 units undergo pre-shipment inspection (PSI). If there is an issue with ZXTR2008Z-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 ZXTR2008Z-7 part is unused and in its original packaging.
Return procedure for ZXTR2008Z-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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