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Diodes Incorporated BZX84C27Q-7-F
- Part No.:
- BZX84C27Q-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C27Q-7-F.pdf
- Description:
- DIODE ZENER 27V 300MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
BZX84C27Q-7-F from Diodes Incorporated is an automotive-grade 27 V, 350 mW surface-mount Zener diode in SOT23 package, rated for 2.0 mA test current with ±10% tolerance (25.1–28.9 V), 80 Ω dynamic impedance at 2 mA, and 0.1 µA maximum reverse leakage at 21.4 V. It provides precise voltage regulation in power supply feedback loops and overvoltage protection circuits for automotive control modules.
For engineers reviewing the BZX84C27Q-7-F datasheet, BZX84C27Q-7-F pinout, BZX84C27Q-7-F application, or BZX84C27Q-7-F equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (357 °C/W), AEC-Q101 qualification, low leakage at rated VR, and SOT23 footprint compatibility with automated PCB assembly.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its planar die construction ensures consistent breakdown characteristics and long-term stability, while the matte tin-plated Alloy 42 leadframe supports reliable solderability per MIL-STD-202.
The device is characterized at 25 °C with a 2.0 mA test current for 27 V nominal rating, exhibits a negative temperature coefficient of −3.5 mV/°C, and derates linearly to zero power at +150 °C ambient per its defined thermal resistance (RθJA = 357 °C/W under specified mounting conditions).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 27 V nominal, 25.1–28.9 V range at IZT = 2.0 mA - defines regulation setpoint accuracy for feedback networks |
| Power Dissipation | 350 mW at TA = 25 °C - sets maximum continuous power handling on standard FR-4 board |
| Zener Impedance (ZZT) | 80 Ω at f = 1 kHz, IZT = 2.0 mA - determines AC regulation stiffness and ripple rejection |
| Reverse Leakage (IR) | 0.1 µA max at VR = 21.4 V - ensures minimal quiescent current in high-impedance bias networks |
| Thermal Resistance (RθJA) | 357 °C/W - quantifies junction-to-ambient heat transfer efficiency under leadframe-cooled conditions |
| Temperature Coefficient | −3.5 mV/°C - enables predictable drift compensation in temperature-sensitive references |
| AEC-Q101 Qualified | Yes - confirms reliability for automotive electronic control units per stress-test requirements |
Pinout & Package
Package: SOT23 - 3-terminal surface-mount plastic package with 0.915 mm body width, 2.40 mm length, and 1.30 mm height; UL 94V-0 rated, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground node | Connected to system ground or lower-potential rail in shunt regulator configuration |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output node | Connected to input via current-limiting resistor; supplies stable 27 V reference to feedback divider |
| Collector / NC (Pin 3) | Internal die attachment pad / mechanical support | Electrically isolated; serves as thermal path and mechanical anchor - must be connected to copper pour for thermal relief |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q101 compliant - validated for operation across −40 °C to +125 °C junction temperature in engine control and body electronics |
| Green material composition | Halogen- and antimony-free molding compound (<900 ppm Br, <900 ppm Cl, <1000 ppm Sb) - meets automotive environmental compliance mandates |
| Low-profile SMT footprint | SOT23 package enables high-density PCB layouts and compatibility with standard pick-and-place equipment |
| Stable low-current regulation | Specified at IZT = 2.0 mA - supports energy-efficient biasing in battery-powered or standby circuits |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Power Supply Feedback |
|---|---|
|
Use Scenario: Regulating 5 V microcontroller supply rail using a TL431-based shunt regulator with external Zener reference. IC Role / Device Role / Timing Role: Provides precise 27 V reference to set TL431 cathode voltage, enabling accurate output voltage trimming. Use Value: Enables ±1% output regulation over temperature and line variation due to tight Zener tolerance and low TC. |
Use Scenario: Overvoltage clamp protecting 24 V DC input stage of programmable logic controller (PLC) I/O module. IC Role / Device Role / Timing Role: Shunt clamping element that conducts above 28.9 V to limit transient excursions and protect downstream regulators. Use Value: Limits peak voltage to ≤29 V with <0.1 µA leakage below 21.4 V - minimizes standby power loss and false triggering. |
| Automotive Body Control Module (BCM) | Medical Sensor Signal Conditioning |
|
Use Scenario: Reference voltage source for analog-to-digital converter (ADC) measuring battery voltage in BCM dashboard cluster. IC Role / Device Role / Timing Role: Supplies stable 27 V reference to ADC reference divider network, improving measurement linearity. Use Value: Maintains <0.5% full-scale error over −40 °C to +105 °C due to AEC-Q101 validation and −3.5 mV/°C TC compensation. |
Use Scenario: Precision voltage clamp in ECG front-end amplifier protecting instrumentation amplifier inputs from defibrillation pulses. IC Role / Device Role / Timing Role: Fast-acting overvoltage protector limiting differential input swing to safe levels during fault events. Use Value: Responds within nanoseconds to transients up to 5 kV due to low junction capacitance (~2 pF at 0 V) and robust SOT23 thermal design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5254BT1G | 27 V nominal, ±5% tolerance (25.65–28.35 V), 500 mW rating, SOD-123 package | Higher power but larger footprint; lacks AEC-Q101 qualification | Select when higher surge capability is needed and automotive qualification is not required |
| BZX84-C27-7-F | Identical electrical specs but non-automotive grade (no Q suffix); same SOT23 package and marking | Not qualified to AEC-Q101 - unsuitable for automotive production | Choose only for cost-sensitive industrial prototypes where automotive reliability is not mandated |
Compared with MMSZ5254BT1G and BZX84-C27-7-F, BZX84C27Q-7-F uniquely combines AEC-Q101 qualification, tight 10% Zener tolerance, and SOT23 miniaturization - making it the sole option for volume automotive designs requiring both reliability and space-constrained layout.
Availability
BZX84C27Q-7-F is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC power supplies, and medical sensor signal conditioning circuits requiring stable component supply with guaranteed AEC-Q101 compliance and traceable green-material sourcing.
Supply support for BZX84C27Q-7-F 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 components for automotive, industrial, and consumer markets.
The BZX84C series belongs to Diodes' automotive-qualified Zener diode product line, designed specifically to meet stringent voltage reference and overvoltage protection needs in safety-critical vehicle subsystems.
FAQ
What is the maximum Zener current (IZM) for BZX84C27Q-7-F?
The absolute maximum Zener current is derived from PD = 350 mW and VZ = 27 V, yielding IZM ≈ 13 mA under ideal thermal conditions. However, sustained operation above 5 mA requires careful PCB thermal design due to RθJA = 357 °C/W - actual usable current depends on ambient temperature and copper area.
Is BZX84C27Q-7-F compatible with lead-free reflow profiles?
Yes - the device uses matte tin finish over Alloy 42 leadframe and is qualified for standard Pb-free reflow per J-STD-020, with peak temperature support up to 260 °C. Its moisture sensitivity level is 1, eliminating bake requirements prior to assembly.
How does the −3.5 mV/°C temperature coefficient affect circuit performance?
This negative coefficient means the Zener voltage decreases by 3.5 mV per degree Celsius rise in junction temperature. In precision references, it necessitates either temperature-compensated resistor dividers or TC-matched components to hold overall system accuracy within ±0.1% over −40 °C to +125 °C.
Can BZX84C27Q-7-F replace BZX84C27-7-F in existing designs?
Yes - electrically identical and pin-compatible, but BZX84C27Q-7-F adds AEC-Q101 qualification, green materials, and enhanced process controls. No layout or schematic changes are needed; however, qualification documentation and lot traceability differ per automotive requirements.
BZX84C27Q-7-F 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
- Voltage - Zener (Nom) (Vz):
- 27 V
- Tolerance:
- ±7.04%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 18.9 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
BZX84C27Q-7-F FAQ
1.How can I place an order for BZX84C27Q-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C27Q-7-F 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 BZX84C27Q-7-F reliable?
The price and inventory of BZX84C27Q-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C27Q-7-F is usually 5 days.
3.What payment methods are accepted for BZX84C27Q-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C27Q-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C27Q-7-F?
BZX84C27Q-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C27Q-7-F 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 BZX84C27Q-7-F?
For technical support, including BZX84C27Q-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C27Q-7-F requirements.
6.How does Aetrix verify that BZX84C27Q-7-F is sourced from the original manufacturer or authorized distributors?
All BZX84C27Q-7-F 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 BZX84C27Q-7-F meets industry standards.
7.What is the process for return or replacement of BZX84C27Q-7-F?
All BZX84C27Q-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C27Q-7-F, 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 BZX84C27Q-7-F part is unused and in its original packaging.
Return procedure for BZX84C27Q-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84C27Q-7-F Tags
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