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Diodes Incorporated BZX84B27Q-7-F
- Part No.:
- BZX84B27Q-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84B27Q-7-F.pdf
- Description:
- DIODE ZENER 27V 300MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:9,393
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Product details
Overview
BZX84B27Q-7-F from Diodes Incorporated is an AEC-Q101-qualified surface-mount precision Zener diode with nominal 27 V zener voltage, ±2% tolerance, 350 mW power dissipation, and SOT23 package. It regulates voltage in automotive power supply rails, ECU reference circuits, and sensor bias networks where stable reverse breakdown under low-current conditions (IZT = 2.0 mA) is required.
For engineers reviewing the BZX84B27Q-7-F datasheet, BZX84B27Q-7-F pinout, BZX84B27Q-7-F application, or BZX84B27Q-7-F equivalent, key selection criteria include zener voltage accuracy at 2.0 mA test current, low dynamic impedance (80 Ω at IZT), temperature coefficient (+21.4 mV/°C), and automotive-grade reliability per AEC-Q101.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain a stable reference voltage across its terminals. Its 27 V nominal zener voltage is specified at 2.0 mA test current (IZT), with maximum zener impedance of 80 Ω at IZT and 300 Ω at knee current (IZK = 0.5 mA).
It exhibits a positive temperature coefficient of +21.4 mV/°C, indicating voltage increases with junction temperature. Thermal resistance is 357 °C/W when terminals are held at ambient, enabling operation from –65 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 27 V nominal, 26.5–27.5 V range at 2.0 mA - ensures tight regulation in 24 V automotive systems |
| Power Dissipation | 350 mW - supports continuous operation in compact SOT23 footprint without forced cooling |
| Zener Impedance | 80 Ω at IZT = 2.0 mA - minimizes output voltage variation under load transients |
| Reverse Leakage | 0.1 µA at VR = 18.9 V - enables ultra-low standby current in battery-critical circuits |
| Temperature Coefficient | +21.4 mV/°C - predictable drift for compensated reference designs above 25 °C |
| Package | SOT23 - compatible with standard pick-and-place equipment and reflow profiles |
Pinout & Package
Package: SOT23 - three-terminal surface-mount plastic case with matte tin-plated alloy 42 leadframe; moisture sensitivity level 1 per J-STD-020; weight ≈ 0.008 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground | Connected to system ground or lower-potential node during reverse-bias regulation |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output | Provides stable 27 V reference when reverse-biased; connects to supply rail or feedback node |
| No-Connect (Pin 3) | Internal die attach pad / thermal slug | Not electrically connected; serves mechanical anchoring and minor thermal relief in PCB layout |
Key Features
| Feature | Design Value |
|---|---|
| ±2% zener voltage tolerance | Reduces need for post-production trimming in automotive voltage references |
| AEC-Q101 qualification | Validated for under-hood applications including engine control modules and body controllers |
| Lead-free, halogen-free "Green" construction | Meets RoHS 3 (2015/863/EU) and automotive environmental compliance requirements |
| Low knee current (0.5 mA) | Enables stable regulation even in ultra-low-power sensor biasing circuits |
Applications
| Automotive ECU Reference | Industrial Sensor Biasing |
|---|---|
|
Use Scenario: Providing stable 27 V reference for analog-to-digital converter (ADC) input scaling in engine control units. IC Role / Device Role / Timing Role: Precision voltage reference diode regulating ADC full-scale input range. Use Value: ±2% VZ tolerance ensures consistent ADC code mapping across temperature and unit variance. |
Use Scenario: Biasing piezoresistive pressure sensors in industrial process monitoring systems. IC Role / Device Role / Timing Role: Low-leakage (0.1 µA) voltage clamp establishing sensor excitation potential. Use Value: Sub-microamp reverse current prevents loading error in high-impedance sensor bridges. |
| Telecom Power Supervision | Consumer Power Sequencing |
|
Use Scenario: Monitoring 24 V DC telecom line voltage via comparator threshold set by zener clamp. IC Role / Device Role / Timing Role: Overvoltage detection element feeding comparator input in power management ICs. Use Value: 80 Ω dynamic impedance ensures sharp threshold transition despite supply ripple. |
Use Scenario: Enabling controlled power-up sequencing in USB-C PD adapters using zener-triggered enable logic. IC Role / Device Role / Timing Role: Voltage-sensing element initiating gate drive activation after rail stabilization. Use Value: +21.4 mV/°C TC allows predictable timing margin adjustment over operating temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ4683T1G | 27 V nominal, ±5% tolerance, 500 mW rating, SOD-123 package | Higher power but looser tolerance; requires larger PCB area | Select when higher surge capability is needed and ±5% regulation is acceptable |
| BZX84-C27 | 27 V nominal, ±5% tolerance, 350 mW, same SOT23 package | Non-automotive grade; lacks AEC-Q101 qualification and tighter tolerance | Select for cost-sensitive non-automotive applications where qualification is not required |
Compared with MMSZ4683T1G and BZX84-C27, BZX84B27Q-7-F delivers superior voltage accuracy and automotive qualification in the same SOT23 footprint, making it optimal for safety-critical 24 V system references where long-term stability and reliability are mandatory.
Availability
BZX84B27Q-7-F is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, telecom power supervision circuits, and consumer power sequencing systems requiring stable component supply and AEC-Q101 compliance.
Supply support for BZX84B27Q-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.
This device belongs to the BZX84B series of precision Zener diodes engineered specifically for automotive and industrial applications demanding tight voltage tolerance, high reliability, and green material compliance.
FAQ
What is the maximum reverse current at 18.9 V for BZX84B27Q-7-F?
The maximum reverse leakage current is 0.1 µA at VR = 18.9 V, as specified in the Electrical Characteristics table. This value is measured at TA = +25°C and confirms suitability for ultra-low-power biasing applications where minimal current draw is critical.
Is BZX84B27Q-7-F compatible with lead-free reflow soldering processes?
Yes - it features matte tin-plated alloy 42 leadframe and is qualified for lead-free reflow per JEDEC J-STD-020, with moisture sensitivity level 1. The device withstands peak temperatures up to 260°C and is fully RoHS 3 compliant.
How does the +21.4 mV/°C temperature coefficient affect circuit performance?
This positive coefficient means the zener voltage increases linearly with junction temperature. At 100°C ambient (assuming typical thermal rise), VZ rises ~1.6 V above 25°C value - a known, predictable shift usable in temperature-compensated reference designs.
Can BZX84B27Q-7-F replace BZX84-C27 in existing designs?
Electrically, yes - both share identical SOT23 pinout and 27 V nominal rating. However, BZX84B27Q-7-F adds ±2% tolerance and AEC-Q101 qualification. No layout change is needed, but qualification testing is recommended for automotive deployment.
BZX84B27Q-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:
- ±2%
- 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
BZX84B27Q-7-F FAQ
1.How can I place an order for BZX84B27Q-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84B27Q-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 BZX84B27Q-7-F reliable?
The price and inventory of BZX84B27Q-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 BZX84B27Q-7-F is usually 5 days.
3.What payment methods are accepted for BZX84B27Q-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84B27Q-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84B27Q-7-F?
BZX84B27Q-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84B27Q-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 BZX84B27Q-7-F?
For technical support, including BZX84B27Q-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84B27Q-7-F requirements.
6.How does Aetrix verify that BZX84B27Q-7-F is sourced from the original manufacturer or authorized distributors?
All BZX84B27Q-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 BZX84B27Q-7-F meets industry standards.
7.What is the process for return or replacement of BZX84B27Q-7-F?
All BZX84B27Q-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84B27Q-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 BZX84B27Q-7-F part is unused and in its original packaging.
Return procedure for BZX84B27Q-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84B27Q-7-F Tags
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