My Inquiry
My Account
Diodes Incorporated BZX84C51-7-F
- Part No.:
- BZX84C51-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C51-7-F.pdf
- Description:
- DIODE ZENER 51V 300MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:31,130
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX84C51-7-F from Diodes Incorporated is a 51 V, 350 mW surface-mount Zener diode in SOT-23 package, rated for 2 mA test current, with 180 Ω maximum Zener impedance at 2 mA and ±10.0 to ±12.0 mV/°C temperature coefficient. It provides precision voltage regulation in low-power power supply rails and overvoltage protection circuits.
For engineers reviewing the BZX84C51-7-F datasheet, BZX84C51-7-F pinout, BZX84C51-7-F application, or BZX84C51-7-F equivalent, key selection criteria include nominal Zener voltage (51 V), power dissipation (350 mW), Zener impedance (180 Ω @ 2 mA), reverse leakage (0.1 μA @ 30.1 V), and thermal resistance (357 °C/W).
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 Zener characteristics, while the SOT-23 package supports high-density PCB layouts and automated reflow assembly.
It exhibits a typical temperature coefficient of +35.7 mV/°C, indicating predictable voltage drift with temperature, and achieves 0.1 μA reverse leakage at 30.1 V - well below its 51 V nominal Zener voltage - ensuring minimal standby current in clamp or reference applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 51 V nominal, 48–54 V range at 2 mA - defines clamping/reference level in voltage-sensitive circuits |
| Power Dissipation (PD) | 350 mW at TA = 25°C - sets maximum continuous power handling on standard FR-4 board |
| Zener Impedance (ZZT) | 180 Ω max @ 2 mA - determines regulation stiffness and AC ripple rejection capability |
| Reverse Leakage Current (IR) | 0.1 μA max @ 30.1 V - ensures negligible quiescent current in standby or low-power monitoring paths |
| Temperature Coefficient (TC) | +10.0 to +12.0 mV/°C - quantifies voltage drift per degree, critical for temperature-stable references |
| Thermal Resistance (RθJA) | 357 °C/W - defines junction-to-ambient rise per watt, used to calculate max operating ambient |
| Package | SOT-23 - 3-pin surface-mount outline with 0.008 g mass, RoHS-compliant matte tin plating |
Pinout & Package
SOT-23 package with anode-cathode-anode terminal configuration: Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = Anode (internally connected to Pin 1). Standard cathode stripe marking identifies Pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Primary anode connection; tied internally to Pin 3 for dual-anode symmetry in SOT-23 Zener layout |
| Pin 2 | Cathode | Zener breakdown terminal; marked by cathode stripe; connects to regulated node or clamp point |
| Pin 3 | Anode | Secondary anode; electrically common with Pin 1 - enables symmetric PCB routing and thermal balance |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures tight Zener voltage tolerance and repeatable breakdown characteristics across production lots |
| 350 mW power rating | Supports robust transient suppression in 3.3 V–5 V logic supply rails without derating at 25°C |
| RoHS-compliant "Green" molding compound | Eliminates halogens and antimony, meeting IPC-J-STD-020D moisture sensitivity Level 1 requirements |
| Matte tin lead finish | Enables reliable solder wetting and intermetallic formation during lead-free reflow (J-STD-020 profile) |
Applications
| Power Supply Voltage Reference | Overvoltage Clamp Circuit |
|---|---|
Use Scenario: Providing stable 51 V reference for feedback loop in isolated DC-DC converter secondary-side regulation. IC Role / Device Role / Timing Role: Zener diode acting as shunt voltage reference, sinking error amplifier current to maintain output accuracy. Use Value: 48–54 V Zener range and 180 Ω impedance ensure <±1% output regulation under 10–90% load steps. | Use Scenario: Protecting microcontroller I/O pins from ESD or surge events exceeding 30 V. IC Role / Device Role / Timing Role: Reverse-biased Zener clamping transient energy to safe voltage before it reaches sensitive input structures. Use Value: 0.1 μA leakage at 30.1 V prevents false triggering, while 350 mW rating absorbs 8 kV HBM pulses without degradation. |
| Low-Power Sensor Biasing | Industrial Signal Conditioning |
Use Scenario: Biasing high-impedance photodiode or RTD bridge in battery-powered environmental sensor nodes. IC Role / Device Role / Timing Role: Zener providing precise bias voltage to analog front-end, minimizing current draw from coin cell. Use Value: Ultra-low 0.1 μA reverse leakage extends 10-year battery life; +35.7 mV/°C TC allows calibrated compensation in firmware. | Use Scenario: Stabilizing reference voltage for 12-bit ADC in programmable logic controller analog input module. IC Role / Device Role / Timing Role: Shunt regulator establishing clean 51 V rail for DAC buffer op-amp supply, reducing code-dependent noise. Use Value: 357 °C/W RθJA enables operation up to +85°C ambient without forced cooling, supporting DIN-rail mounting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5251BS-7-F | Same 51 V nominal, but 200 mW rating and 220 Ω ZZT; SOT-23, same pinout | Lower power handling limits use in >10 mA clamp scenarios; higher ZZT reduces regulation precision | Select when lower cost and reduced thermal stress are prioritized over peak pulse absorption |
| BZX84-C51,115 | Identical electrical specs, but Nexperia-marked SOT-23 with different date-code format and RoHS compliance documentation | No functional difference; qualified for same automotive AEC-Q200 stress tests | Choose for dual-sourcing assurance where Diodes Inc. supply continuity is constrained |
Compared with MMBZ5251BS-7-F and BZX84-C51,115, the BZX84C51-7-F delivers higher power margin (350 mW vs. 200 mW) and tighter Zener impedance (180 Ω), making it preferred for industrial clamping and precision reference designs requiring long-term stability.
Availability
BZX84C51-7-F is available at Aetrix Electronics and suitable for industrial power supply design, embedded sensor interface circuits, and automotive body control modules requiring stable component supply and full RoHS compliance.
Supply support for BZX84C51-7-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 centers across Asia and manufacturing in China, Taiwan, and the U.S.
The BZX84 series belongs to Diodes' precision Zener portfolio, engineered specifically for voltage regulation, reference, and overvoltage protection in space-constrained, high-reliability applications.
FAQ
What is the maximum reverse voltage this Zener can withstand before breakdown?
The BZX84C51-7-F has a nominal Zener voltage of 51 V, with a guaranteed breakdown range of 48.0–54.0 V at 2 mA test current. It does not conduct significantly below 48.0 V - reverse leakage remains ≤0.1 μA at 30.1 V, confirming stable non-conduction well below nominal Zener voltage.
Can this device be used in parallel for higher power dissipation?
No - Zener diodes exhibit negative temperature coefficients and mismatched breakdown voltages, causing current hogging when paralleled. The BZX84C51-7-F must be used individually; for >350 mW needs, select a higher-power Zener like the 1N5355B (5 W) or use active regulation instead.
Is the SOT-23 package compatible with standard reflow profiles?
Yes - the BZX84C51-7-F uses matte tin-plated leads and meets J-STD-020D Level 1 moisture sensitivity. It is qualified for standard lead-free reflow profiles (peak 260°C, 60 sec max), provided the recommended SOT-23 pad layout from Diodes' AP02001 is followed to ensure thermal reliability.
How does the temperature coefficient affect circuit performance?
With a +10.0 to +12.0 mV/°C coefficient, the Zener voltage increases ~0.51 V over a 50°C rise (e.g., 25°C to 75°C). In precision references, this drift must be compensated via resistor networks or software calibration - unlike bandgap references, it offers no inherent cancellation.
BZX84C51-7-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):
- 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-F FAQ
1.How can I place an order for BZX84C51-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C51-7-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 BZX84C51-7-F reliable?
The price and inventory of BZX84C51-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C51-7-F is usually 5 days.
3.What payment methods are accepted for BZX84C51-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C51-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C51-7-F?
BZX84C51-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C51-7-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 BZX84C51-7-F?
For technical support, including BZX84C51-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C51-7-F requirements.
6.How does Aetrix verify that BZX84C51-7-F is sourced from the original manufacturer or authorized distributors?
All BZX84C51-7-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 BZX84C51-7-F meets industry standards.
7.What is the process for return or replacement of BZX84C51-7-F?
All BZX84C51-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C51-7-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 BZX84C51-7-F part is unused and in its original packaging.
Return procedure for BZX84C51-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84C51-7-F Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
