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NXP Semiconductors BZX84-C51/LF1R
- Part No.:
- BZX84-C51/LF1R
- Manufacturer:
- NXP Semiconductors
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84-C51/LF1R.pdf
- Description:
- DIODE ZENER 51V 250MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,008
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Product details
Overview
BZX84-C51/LF1R from NXP Semiconductors is a ±5 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, rated for 51 V nominal breakdown voltage at 5 mA, 250 mW total power dissipation, and AEC-Q101 qualified for automotive use.
For engineers reviewing the BZX84-C51/LF1R datasheet, BZX84-C51/LF1R pinout, BZX84-C51/LF1R application, or BZX84-C51/LF1R equivalent, key selection factors include its 51 V Zener voltage with ±5 % tolerance, low differential resistance (90 Ω typ. at IZ = 5 mA), reverse current ≤0.05 μA at VR = 38.3 V, temperature coefficient of +1.2 mV/K, and suitability for precision voltage reference and overvoltage protection in space-constrained PCB layouts.
Technical Context
This discrete Zener diode operates in reverse-biased breakdown mode to maintain stable voltage across load variations. It delivers regulated output under DC or low-frequency transient conditions, with non-repetitive peak reverse power dissipation up to 40 W for tp ≤100 μs pulses.
Designed for surface-mount implementation on FR4 PCBs with single-sided copper, it features an anode-cathode configuration (Pin 1: Anode, Pin 3: Cathode, Pin 2: Not Connected) and thermal resistance from junction to ambient of 500 K/W in free air.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 50.49 V to 51.51 V at IZ = 5 mA - defines precise regulation point within ±5 % tolerance band |
| Total Power Dissipation (Ptot) | 250 mW at Tamb ≤25 °C - sets maximum continuous DC power handling on standard FR4 PCB |
| Differential Resistance (rdif) | 90 Ω typical at IZ = 5 mA - determines output impedance and regulation stiffness under load changes |
| Reverse Current (IR) | ≤0.05 μA at VR = 38.3 V - ensures minimal leakage before breakdown, critical for low-power standby circuits |
| Temperature Coefficient (SZ) | +1.2 mV/K - indicates positive drift; enables predictable compensation in temperature-stable references |
| Non-repetitive Peak Reverse Current (IZSM) | 0.4 A at tp = 100 μs - supports transient surge suppression without device failure |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA - defines conduction threshold in forward bias, relevant for polarity protection |
Pinout & Package
SOT23 (TO-236AB) plastic surface-mounted package with 3 leads; dimensions: 2.9 mm × 1.3 mm × 1.0 mm (L × W × H); standard footprint per Fig 9 (reflow) and Fig 10 (wave soldering).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connects to lower-potential side in reverse-bias regulation; forward conduction path when polarity reversed |
| 2 | Not Connected (n.c.) | No internal bond; must remain unconnected on PCB to avoid parasitic coupling or mechanical stress |
| 3 | Cathode (K) | Connects to higher-potential side in reverse-bias operation; primary terminal for voltage reference output |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity testing, and ESD robustness |
| ±5 % Zener voltage tolerance | Enables cost-effective voltage clamping where tight regulation is not required, e.g., supply rail supervision |
| Low leakage current | IR ≤0.05 μA at VR = 38.3 V minimizes quiescent power loss in battery-powered sensor nodes |
| Standard SOT23 footprint | Ensures compatibility with high-volume automated assembly and reflow processes without custom tooling |
| Non-repetitive 40 W surge rating | Provides transient overvoltage immunity against ESD and inductive switching spikes in automotive ECUs |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating 5 V microcontroller supply rail in door module exposed to load dump transients. IC Role / Device Role / Timing Role: Zener clamp protecting LDO input from >60 V surges while maintaining stable bias for CAN transceiver. Use Value: Prevents LDO damage during ISO 7637-2 Pulse 5a events; leverages 0.4 A IZSM and AEC-Q101 qualification. |
Use Scenario: Providing stable 51 V reference for 16-bit ADC in pressure transducer front-end. IC Role / Device Role / Timing Role: Precision voltage reference source with +1.2 mV/K TC enabling software-based temperature compensation. Use Value: Achieves <±0.5 % reference stability over −40 °C to +125 °C using measured SZ and calibration lookup. |
| Consumer Power Adapter Feedback | Telecom Line Interface Protection |
Use Scenario: Secondary-side voltage sensing in flyback converter for USB PD charger. IC Role / Device Role / Timing Role: Zener element in optocoupler feedback loop setting output voltage via TL431 reference divider. Use Value: ±5 % tolerance accommodates production spread while maintaining ±3 % overall output regulation. |
Use Scenario: Overvoltage clamping on RS-485 bus lines subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Primary shunt protector limiting line-to-ground voltage to 51 V during fast transients. Use Value: 40 W non-repetitive pulse rating absorbs IEC 61000-4-5 Level 3 surges without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5255BS-7-F (Diodes Inc.) | 51 V, ±5 %, 225 mW Ptot, 100 Ω rdif typ., SOT23 package | Lower power rating and higher dynamic impedance reduce regulation accuracy under varying loads | Select when cost sensitivity outweighs need for lowest leakage or highest surge margin |
| 1SMA5927BT3G (onsemi) | 51 V, ±5 %, 1.5 W Ptot, DO-214AC package, 100 Ω rdif typ. | Larger package increases board area; higher power enables sustained dissipation but lacks AEC-Q101 | Choose for industrial power supplies requiring >250 mW continuous dissipation, not automotive environments |
Compared with MMBZ5255BS-7-F and 1SMA5927BT3G, BZX84-C51/LF1R offers superior leakage performance (0.05 μA vs. ≥1 μA), AEC-Q101 qualification for automotive use, and optimized SOT23 thermal resistance-making it preferred for space-constrained, safety-critical, or low-quiescent-current designs.
Availability
BZX84-C51/LF1R is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, consumer power adapter feedback circuits, and telecom line interface protection requiring stable component supply and AEC-Q101 compliance.
Supply support for BZX84-C51/LF1R 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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.
The BZX84 series is part of NXP's broad portfolio of discrete protection and regulation devices, engineered specifically for high-reliability, surface-mount voltage reference and clamping applications in harsh environments.
FAQ
What is the Zener voltage tolerance of BZX84-C51/LF1R?
The BZX84-C51/LF1R has a nominal Zener voltage of 51 V with a tolerance of approximately ±5 %, meaning its actual breakdown voltage falls between 48.0 V and 54.0 V at IZ = 5 mA, as specified in Table 9 of the NXP datasheet Rev. 6.
Is BZX84-C51/LF1R suitable for automotive applications?
Yes, BZX84-C51/LF1R is AEC-Q101 qualified per Section 8.1 of the NXP datasheet, confirming its reliability for automotive use including temperature cycling, humidity resistance, and ESD robustness-making it appropriate for engine control units, body electronics, and infotainment systems.
What is the maximum reverse current for BZX84-C51/LF1R at 38.3 V?
At VR = 38.3 V, the reverse current IR for BZX84-C51/LF1R is guaranteed to be ≤0.05 μA (50 nA), as stated in Table 9 under "Reverse current IR (μA)" for the C-series variant, ensuring minimal standby power loss in precision reference circuits.
Does BZX84-C51/LF1R have a connected third pin?
No, Pin 2 of BZX84-C51/LF1R is explicitly marked "n.c." (not connected) in Table 2 of the datasheet. It has no internal bond and must remain unconnected on the PCB to prevent mechanical stress or unintended coupling.
What is the thermal resistance from junction to ambient for BZX84-C51/LF1R?
The thermal resistance from junction to ambient (Rth(j-a)) for BZX84-C51/LF1R is 500 K/W in free air, as specified in Table 6. This value assumes mounting on a FR4 PCB with single-sided copper and standard footprint per Figure 9.
BZX84-C51/LF1R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- 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:
- ±5%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 180 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 35.7 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23 (TO-236AB)
BZX84-C51/LF1R FAQ
1.How can I place an order for BZX84-C51/LF1R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84-C51/LF1R 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 BZX84-C51/LF1R reliable?
The price and inventory of BZX84-C51/LF1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-C51/LF1R is usually 5 days.
3.What payment methods are accepted for BZX84-C51/LF1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-C51/LF1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84-C51/LF1R?
BZX84-C51/LF1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84-C51/LF1R 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 BZX84-C51/LF1R?
For technical support, including BZX84-C51/LF1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-C51/LF1R requirements.
6.How does Aetrix verify that BZX84-C51/LF1R is sourced from the original manufacturer or authorized distributors?
All BZX84-C51/LF1R 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 BZX84-C51/LF1R meets industry standards.
7.What is the process for return or replacement of BZX84-C51/LF1R?
All BZX84-C51/LF1R units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-C51/LF1R, 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 BZX84-C51/LF1R part is unused and in its original packaging.
Return procedure for BZX84-C51/LF1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84-C51/LF1R 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
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