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Diodes Incorporated BZX84C27W-7
- Part No.:
- BZX84C27W-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
BZX84C27W-7.pdf
- Description:
- DIODE ZENER 27V 200MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:2,146
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Product details
Overview
BZX84C27W-7 from Diodes Incorporated is a 27 V, 200 mW surface-mount Zener diode in SOT-323 package, rated for 2.0 mA test current, with ±1.8 V zener voltage tolerance (25.1–28.9 V), 80 Ω max zener impedance at 2 mA, and 0.1 µA max reverse leakage at 18.9 V. It provides precision voltage regulation in low-power analog reference and overvoltage protection circuits.
For engineers reviewing the BZX84C27W-7 datasheet, BZX84C27W-7 pinout, BZX84C27W-7 application, or BZX84C27W-7 equivalent, key selection criteria include nominal zener voltage, zener impedance at specified test current, power derating above 25°C, thermal resistance (625 K/W), and SOT-323 mechanical compatibility with high-density PCB layouts.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load or supply conditions. Its planar die construction ensures consistent breakdown characteristics and low temperature coefficient (21.4 to 25.3 mV/°C) over the full operating range.
Designed for low-current regulation, it delivers 27 V nominal clamping with tight 2.0 mA test current specification and supports operation from −65°C to +125°C. The device exhibits 0.5 mA knee current and 18.9 V minimum reverse voltage before significant conduction begins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nom) | 27 V - precise DC reference or clamp level at 2.0 mA test current |
| Zener Voltage Range | 25.1–28.9 V - guaranteed tolerance band defining regulation accuracy |
| Zener Impedance | 80 Ω max at 2 mA - determines output voltage variation under load changes |
| Power Dissipation | 200 mW - maximum steady-state power at 25°C ambient, derates linearly above |
| Thermal Resistance | 625 K/W - junction-to-ambient value used to calculate temperature rise on FR4 board |
| Reverse Leakage | 0.1 µA max at 18.9 V - defines off-state current in voltage-sensing or high-impedance bias networks |
| Temp Coefficient | +21.4 to +25.3 mV/°C - positive drift rate affecting long-term stability in non-temperature-compensated designs |
Pinout & Package
Package: SOT-323 - ultra-small surface-mount plastic case (2.0 × 1.25 × 0.9 mm), RoHS-compliant, matte tin-plated leads, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / cathode reference node in reverse-biased configuration | Connected to lower-potential side of regulated node; defines polarity for correct Zener orientation |
| Cathode | Reverse breakdown terminal / voltage reference output | Connected to higher-potential side; supplies stable 27 V reference when reverse-biased above knee voltage |
| Case | Non-electrical mechanical structure | No internal connection; serves only as thermal and mechanical interface to PCB |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures repeatable breakdown voltage and low parametric drift across production lots |
| 200 mW power rating | Enables use in space-constrained, low-power analog circuits without forced cooling |
| SOT-323 footprint | Supports high-density PCB layouts with 0.65 mm lead pitch and minimal board area usage |
| Lead-free/RoHS compliance | Meets global environmental regulations without compromising solderability or reliability |
| −65°C to +125°C operating range | Validates performance in industrial and automotive under-hood environments |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 27 V reference for feedback loop in low-current linear regulator or op-amp bias network. IC Role / Device Role / Timing Role: Voltage reference element establishing precise DC setpoint for control circuitry. Use Value: Maintains regulation within ±1.8 V over temperature and current variations, enabling accurate output tracking. | Use Scenario: Protecting microcontroller I/O pins from transient overvoltage events exceeding 27 V. IC Role / Device Role / Timing Role: Shunt protection device that conducts excess energy to ground when input exceeds 27 V. Use Value: Limits peak voltage to 28.9 V (max) during transients, preventing latch-up or gate oxide damage. |
| Signal Level Translation | ADC Input Protection |
Use Scenario: Biasing sensor output signals to 27 V rail in high-side sensing configurations. IC Role / Device Role / Timing Role: Clamping diode establishing upper signal swing limit in analog front-end stages. Use Value: Prevents signal saturation beyond 28.9 V while maintaining low leakage (<0.1 µA) below 18.9 V. | Use Scenario: Safeguarding 24-bit SAR ADC input against ESD or surge-induced overvoltage. IC Role / Device Role / Timing Role: Front-end voltage limiter placed before RC filter and input buffer. Use Value: Adds <1 pF parasitic capacitance (per datasheet Fig. 4), preserving signal integrity up to 100 kHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5256BS-7-F | 27 V nominal, 350 mW rating, SOT-323, 100 Ω zener impedance at 20 mA | Higher power handling but requires 10× higher test current for spec compliance | Select when higher surge energy absorption is needed and board layout allows higher dissipation |
| BZX84-C27LT1G | 27 V nominal, 300 mW rating, SOT-23, 30 Ω zener impedance at 5 mA | Larger SOT-23 footprint, tighter impedance, different test current condition | Choose for improved regulation stability where SOT-23 pad layout is acceptable and lower impedance is critical |
Compared with MMBZ5256BS-7-F and BZX84-C27LT1G, BZX84C27W-7 offers optimal balance of ultra-compact SOT-323 size, 200 mW thermal envelope, and 2 mA test-point alignment with low-power reference designs-making it preferred for space-limited, battery-operated, or thermally constrained applications.
Availability
BZX84C27W-7 is available at Aetrix Electronics and suitable for power supply reference, overvoltage clamp, and ADC input protection requiring stable component supply and consistent Zener voltage performance across production batches.
Supply support for BZX84C27W-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, industry-standard components for power management, signal integrity, and protection.
The BZX84 series belongs to Diodes' general-purpose Zener diode product line, engineered for cost-effective, space-efficient voltage regulation and transient suppression in consumer, industrial, and computing applications.
FAQ
What is the maximum reverse voltage before significant conduction begins in BZX84C27W-7?
The BZX84C27W-7 exhibits a knee voltage of 18.9 V, defined as the reverse voltage at which 0.5 mA current flows. Below this threshold, reverse leakage remains ≤0.1 µA, ensuring minimal loading in high-impedance bias networks and precision reference circuits.
How does thermal derating affect BZX84C27W-7's power capability above 25°C?
BZX84C27W-7's 200 mW rating applies only at 25°C ambient. Power must be linearly reduced by 1.6 mW/°C above 25°C due to its 625 K/W thermal resistance. At 85°C ambient, maximum allowable dissipation drops to 104 mW, requiring careful layout and current limiting in elevated-temperature environments.
Is BZX84C27W-7 compatible with lead-free reflow soldering processes?
Yes-BZX84C27W-7 features matte tin-plated leads qualified for standard Pb-free reflow profiles (JEDEC J-STD-020D Level 1). Its SOT-323 package withstands peak temperatures up to 260°C for 10 seconds, and the device is rated for moisture sensitivity level 1, eliminating bake requirements prior to assembly.
Can BZX84C27W-7 be used in series or parallel configurations for higher voltage or current handling?
Series connection is not recommended due to mismatched zener impedances and temperature coefficients causing uneven voltage division. Parallel use is discouraged because minor VZ variations lead to current hogging-only one diode conducts significantly. For higher power, select a single higher-rated Zener like MMBZ5256BS-7-F instead.
BZX84C27W-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- -
- Tolerance:
- -
- Power - Max:
- -
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
BZX84C27W-7 FAQ
1.How can I place an order for BZX84C27W-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C27W-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 BZX84C27W-7 reliable?
The price and inventory of BZX84C27W-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C27W-7 is usually 5 days.
3.What payment methods are accepted for BZX84C27W-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C27W-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C27W-7?
BZX84C27W-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C27W-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 BZX84C27W-7?
For technical support, including BZX84C27W-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C27W-7 requirements.
6.How does Aetrix verify that BZX84C27W-7 is sourced from the original manufacturer or authorized distributors?
All BZX84C27W-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 BZX84C27W-7 meets industry standards.
7.What is the process for return or replacement of BZX84C27W-7?
All BZX84C27W-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C27W-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 BZX84C27W-7 part is unused and in its original packaging.
Return procedure for BZX84C27W-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84C27W-7 Tags
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Diodes Incorporated
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