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Diodes Incorporated BZX84C51-7
- Part No.:
- BZX84C51-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C51-7.pdf
- Description:
- DIODE ZENER 51V 300MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,772
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Product details
Overview
BZX84C51-7 from Diodes Incorporated is a 51 V, 350 mW surface-mount Zener diode in SOT-23 package, rated for 2 mA test current, with 48–54 V zener voltage range, 180 Ω dynamic impedance at 2 mA, and ±10–12 mV/°C temperature coefficient-used for precision voltage reference and overvoltage clamping in power supply feedback loops.
For engineers reviewing the BZX84C51-7 datasheet, BZX84C51-7 pinout, BZX84C51-7 application, or BZX84C51-7 equivalent, key selection criteria include zener voltage tolerance (±6%), thermal resistance (357 °C/W), reverse leakage (≤0.1 μA at 30.1 V), RoHS-compliant green construction, and compatibility with automated SMT assembly.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage regulation across load and line variations. Its planar die construction ensures consistent breakdown characteristics, while the SOT-23 package enables high-density PCB layouts and thermal performance validated under JEDEC J-STD-020D Level 1 moisture sensitivity.
It delivers 51 V nominal regulation at 2 mA test current with 180 Ω dynamic impedance (ZZT) and 400 Ω knee impedance (ZZK), supporting low-noise reference generation where temperature drift (±10–12 mV/°C) must be factored into system-level compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 51 V nominal, 48–54 V min/max at IZT = 2 mA - defines regulated output voltage window under standard test conditions |
| Power Dissipation (PD) | 350 mW at TA = 25°C with terminals held at ambient - sets maximum continuous power handling on FR-4 board |
| Zener Impedance (ZZT) | 180 Ω at IZT = 2 mA, f = 1 kHz - determines AC voltage variation under small-signal load transients |
| Reverse Leakage (IR) | ≤0.1 μA at VR = 30.1 V - ensures minimal quiescent current in standby or high-impedance bias networks |
| Temperature Coefficient | ±10–12 mV/°C - quantifies zener voltage drift per degree Celsius, critical for wide-temperature-range references |
| Thermal Resistance (RθJA) | 357 °C/W - links junction-to-ambient temperature rise to power dissipation in standard mounting |
| Package | SOT-23 - 3-pin surface-mount outline with 0.008 g mass, UL 94V-0 flammability rating, and matte tin lead finish |
Pinout & Package
Package: SOT-23 - compact plastic surface-mount case with cathode-marked top view; polarity indicated by cathode band; terminals solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node when used as shunt regulator |
| Cathode | Reverse-biased Zener terminal / voltage reference output | Connected to regulated node; voltage develops across cathode-to-anode during breakdown |
| Case / Not Connected | Non-electrical mechanical termination | SOT-23 has no internal thermal pad; case serves only structural and alignment function |
Key Features
| Feature | Design Value |
|---|---|
| Green RoHS compliance | Lead-, halogen-, and antimony-free molding compound (Data Code V9+), meeting environmental manufacturing requirements |
| Automated assembly suitability | Planar die + SOT-23 footprint enables reliable pick-and-place and reflow processing without manual handling |
| Stable zener voltage tolerance | ±6% total variation (48–54 V) at 2 mA ensures predictable clamping threshold in protection circuits |
| Low reverse leakage | 0.1 μA max at 30.1 V minimizes error current in high-impedance voltage divider or reference networks |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener diode provides precise 51 V reference to TL431 or optocoupler LED anode, setting secondary-side regulation threshold. Use Value: Tight 48–54 V tolerance ensures ±1% output accuracy; low ZZT maintains stability under transient load steps. | Use Scenario: Clamping surge-induced voltage spikes on 48 V DC bus lines in industrial control systems. IC Role / Device Role / Timing Role: Shunt-connected Zener absorbs transient energy above 51 V, diverting excess current to ground before downstream ICs are damaged. Use Value: 350 mW power rating supports short-duration surges; 0.1 μA leakage avoids false triggering during normal operation. |
| Programmable Voltage Reference | ADC Input Protection |
Use Scenario: Generating stable reference for 12-bit SAR ADCs in battery-powered sensor nodes. IC Role / Device Role / Timing Role: Provides low-drift 51 V reference scaled down via resistor divider to match ADC input range (e.g., 0–2.5 V). Use Value: ±10–12 mV/°C TC allows calibration at one temperature; 180 Ω impedance limits divider loading error. | Use Scenario: Protecting analog front-end inputs of microcontrollers against ESD or accidental overvoltage exposure. IC Role / Device Role / Timing Role: Placed between signal line and ground to clamp fast transients before reaching sensitive ADC or GPIO pins. Use Value: Fast response in reverse breakdown; SOT-23 footprint fits near connector entry points without increasing board area. |
Availability
BZX84C51-7 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, programmable voltage references, and ADC input protection requiring stable component supply and RoHS-compliant sourcing.
Supply support for BZX84C51-7 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, cost-optimized components for power management, signal integrity, and protection applications.
The BZX84 series belongs to Diodes' precision Zener diode product line, engineered for stable voltage regulation and clamping in space-constrained, high-volume consumer and industrial power systems.
FAQ
What is the maximum reverse voltage this Zener can withstand before breakdown?
The BZX84C51-7 exhibits a nominal zener voltage of 51 V at 2 mA test current, with guaranteed breakdown occurring between 48 V and 54 V. It is not rated for sustained reverse operation below its specified zener range; operation below 48 V results in negligible reverse current (≤0.1 μA at 30.1 V), confirming sharp knee characteristics.
Can this device replace a BZX84C47-7 in a 47 V reference circuit?
No-BZX84C51-7 is not a drop-in replacement for BZX84C47-7 due to its higher nominal zener voltage (51 V vs. 47 V) and different voltage range (48–54 V vs. 44–50 V). Substituting it would shift regulation point by ~4 V, potentially causing overvoltage or undervoltage in feedback or reference paths unless circuit gain/resistor values are recalculated.
Is the SOT-23 package thermally adequate for continuous 350 mW dissipation?
No-the 350 mW rating applies only under specific conditions: terminals held at ambient temperature (Note 2) or mounted on FR-4 with recommended pad layout (Note 1). In typical PCB layouts, derating is required; Fig. 1 shows power drops to ~200 mW at 70°C ambient, making forced-air or thermal vias necessary for sustained high-power use.
Does this Zener diode have a specified capacitance value for high-frequency applications?
While not explicitly listed in the datasheet's Electrical Characteristics table, Figure 3 shows typical total capacitance of ~10 pF for 51 V nominal zeners. This low value supports use in moderate-frequency (<1 MHz) regulation and clamping; however, no guaranteed max CT is provided, so designs requiring tight capacitive limits should verify with actual measurement or SPICE model.
BZX84C51-7 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:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 51 V
- Tolerance:
- ±6%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 180 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 35.7 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
BZX84C51-7 FAQ
1.How can I place an order for BZX84C51-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C51-7 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 BZX84C51-7 reliable?
The price and inventory of BZX84C51-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C51-7 is usually 5 days.
3.What payment methods are accepted for BZX84C51-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C51-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C51-7?
BZX84C51-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C51-7 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 BZX84C51-7?
For technical support, including BZX84C51-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C51-7 requirements.
6.How does Aetrix verify that BZX84C51-7 is sourced from the original manufacturer or authorized distributors?
All BZX84C51-7 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 BZX84C51-7 meets industry standards.
7.What is the process for return or replacement of BZX84C51-7?
All BZX84C51-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C51-7, 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 BZX84C51-7 part is unused and in its original packaging.
Return procedure for BZX84C51-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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