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NXP Semiconductors BZX84-C12/LF1R
- Part No.:
- BZX84-C12/LF1R
- Manufacturer:
- NXP Semiconductors
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84-C12/LF1R.pdf
- Description:
- DIODE ZENER 12V 250MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:5,313
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Product details
Overview
BZX84-C12/LF1R from NXP Semiconductors is a 12 V ±5 % tolerance Zener diode in SOT23 package, rated for 250 mW total power dissipation at 25 °C ambient, with 10 µA maximum reverse current at 9.1 V and 85 Ω typical differential resistance at 5 mA. It serves as a low-power voltage reference or regulation element in power supply feedback paths and overvoltage protection circuits.
For engineers reviewing the BZX84-C12/LF1R datasheet, BZX84-C12/LF1R pinout, BZX84-C12/LF1R application, or BZX84-C12/LF1R equivalent, key selection criteria include its ±5 % breakdown voltage tolerance, AEC-Q101 qualification for automotive use, SOT23 footprint compatibility, and thermal resistance of 500 K/W junction-to-ambient in free air.
Technical Context
This device operates as a silicon planar Zener diode optimized for stable reverse-biased voltage regulation. Its breakdown voltage is specified at 11.4 V (min) to 12.7 V (max) under 5 mA test current, with temperature coefficient of +6.0 mV/K (typical) and diode capacitance of 20 pF at 0 V and 1 MHz.
The BZX84-C12/LF1R supports non-repetitive peak reverse power dissipation up to 40 W for pulses ≤100 µs, and exhibits forward voltage ≤0.9 V at 10 mA. It is qualified per AEC-Q101 for automotive applications and mounted on FR4 PCB with single-sided copper and standard SOT23 footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VZ) | 11.4 V min to 12.7 V max at IZ = 5 mA - defines regulation window for precision reference or clamping |
| Tolerance | ±5 % - suitable for non-critical voltage references where tight regulation is not required |
| Total Power Dissipation (Ptot) | 250 mW at Tamb ≤ 25 °C - limits continuous DC power handling in compact layouts |
| Differential Resistance (rdif) | 50 Ω typical at IZ = 5 mA - determines regulation stiffness and load-induced voltage shift |
| Reverse Current (IR) | ≤10 µA at VR = 9.1 V - ensures low leakage in high-impedance bias networks |
| Thermal Resistance (Rth(j-a)) | 500 K/W in free air - dictates derating curve and maximum ambient temperature for safe operation |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling and humidity testing |
Pinout & Package
Package: SOT23 (TO-236AB), 3-lead surface-mount plastic package with 2.8 mm × 1.4 mm body, 0.95 mm height, and standard 1.9 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Anode | Connected to lower potential side in reverse-bias configuration; carries forward current during conduction |
| 2 (n.c.) | Not Connected | Internally unconnected terminal; must remain floating - no PCB trace or solder joint required |
| 3 (Cathode) | Cathode | Connected to higher potential side in reverse-bias; primary terminal for voltage reference output and heat sinking |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMT packaging | SOT23 footprint enables high-density PCB layouts and automated assembly compatibility |
| Automotive qualification | AEC-Q101 compliance ensures robustness across -55 °C to +150 °C operating range |
| Controlled Zener impedance | 85 Ω max differential resistance at 5 mA supports stable regulation under varying load |
| Low leakage performance | 10 µA max reverse current at 9.1 V minimizes error in high-impedance sensing circuits |
| Pulse survivability | 40 W non-repetitive peak reverse power rating accommodates transient overvoltage events |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Stabilizing output voltage in linear regulator feedback loop or switching converter error amplifier input. IC Role / Device Role / Timing Role: Provides precise 12 V reference point against which output is compared. Use Value: Enables ±5 % output regulation accuracy without external trimming components. |
Use Scenario: Limiting voltage spikes on 12 V rail caused by inductive load switching or ESD events. IC Role / Device Role / Timing Role: Acts as shunt clamp, conducting excess energy when rail exceeds 12.7 V. Use Value: Absorbs up to 40 W transient power for ≤100 µs, protecting downstream ICs. |
| Automotive Sensor Bias Network | Industrial Signal Conditioning Reference |
Use Scenario: Supplying stable bias voltage to analog sensor elements (e.g., pressure transducers) in engine control units. IC Role / Device Role / Timing Role: Delivers regulated 12 V reference independent of battery fluctuations. Use Value: Maintains sensor linearity across -40 °C to +125 °C ambient due to AEC-Q101 qualification. |
Use Scenario: Setting threshold voltage for comparator-based fault detection in PLC I/O modules. IC Role / Device Role / Timing Role: Functions as fixed-voltage reference for level-shifting or window-detection circuits. Use Value: Low 10 µA leakage prevents loading of high-impedance signal paths in 24 V industrial systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5242B-7-F (Diodes Inc.) | 12 V ±5 %, 350 mW Ptot, 15 µA IR @ 9.1 V, SOT23 package | Higher power rating but higher leakage; not AEC-Q101 qualified | Select when higher continuous power margin is needed and automotive qualification is not required. |
| 1SMA5917BT3G (ON Semiconductor) | 12 V ±5 %, 1.5 W Ptot, 10 µA IR @ 9.1 V, SMA package (larger footprint) | Higher power capability but incompatible SMT footprint; requires PCB redesign | Choose for high-energy transient suppression where SOT23 thermal limits are exceeded. |
Compared with MMBZ5242B-7-F and 1SMA5917BT3G, the BZX84-C12/LF1R offers AEC-Q101 qualification and optimal thermal performance in space-constrained SOT23 layouts, while trading off absolute power handling for automotive-grade reliability and board-area efficiency.
Availability
BZX84-C12/LF1R is available at Aetrix Electronics and suitable for automotive electronics, industrial power supplies, and sensor interface circuits requiring stable component supply with consistent parametric performance and long-term sourcing continuity.
Supply support for BZX84-C12/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 applications.
The BZX84 series was designed as a cost-effective, AEC-Q101-qualified family of low-power Zener diodes targeting voltage reference, regulation, and protection functions in space-constrained automotive and industrial control systems.
FAQ
What is the exact breakdown voltage range for BZX84-C12/LF1R?
The BZX84-C12/LF1R has a guaranteed breakdown voltage range of 11.4 V (minimum) to 12.7 V (maximum) when tested at 5 mA reverse current and 25 °C junction temperature. This ±5 % tolerance reflects the "C" grade within the BZX84 series and is confirmed in Table 8 of the NXP datasheet Rev. 6.
Is BZX84-C12/LF1R suitable for automotive applications?
Yes, BZX84-C12/LF1R is AEC-Q101 qualified per Section 8.1 of the NXP datasheet, having passed stress tests for temperature cycling, humidity, and mechanical shock. It operates reliably from −55 °C to +150 °C junction temperature, making it appropriate for under-hood and infotainment system designs.
What is the maximum reverse current specification for BZX84-C12/LF1R?
The BZX84-C12/LF1R specifies a maximum reverse current (IR) of 10 µA at VR = 9.1 V and Tj = 25 °C, as shown in Table 8. This low leakage supports accurate voltage referencing in high-impedance circuits such as op-amp bias networks or comparator thresholds.
Does BZX84-C12/LF1R have a connected pin 2?
No, pin 2 of the BZX84-C12/LF1R is internally not connected (n.c.), as documented in Table 2 ("Pinning") of the NXP datasheet. It must remain unconnected on the PCB - no trace, pad, or solder joint should be applied to this terminal.
What is the thermal resistance from junction to ambient for BZX84-C12/LF1R?
The BZX84-C12/LF1R has a thermal resistance Rth(j-a) of 500 K/W in free air, per Table 6 of the NXP datasheet. This value assumes mounting on a FR4 PCB with single-sided copper, tin-plated, and standard SOT23 footprint - critical for calculating safe operating area and derating curves.
BZX84-C12/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):
- 12 V
- Tolerance:
- ±5%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 8 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-C12/LF1R FAQ
1.How can I place an order for BZX84-C12/LF1R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84-C12/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-C12/LF1R reliable?
The price and inventory of BZX84-C12/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-C12/LF1R is usually 5 days.
3.What payment methods are accepted for BZX84-C12/LF1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-C12/LF1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84-C12/LF1R?
BZX84-C12/LF1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84-C12/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-C12/LF1R?
For technical support, including BZX84-C12/LF1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-C12/LF1R requirements.
6.How does Aetrix verify that BZX84-C12/LF1R is sourced from the original manufacturer or authorized distributors?
All BZX84-C12/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-C12/LF1R meets industry standards.
7.What is the process for return or replacement of BZX84-C12/LF1R?
All BZX84-C12/LF1R units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-C12/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-C12/LF1R part is unused and in its original packaging.
Return procedure for BZX84-C12/LF1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84-C12/LF1R Tags
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MMSZ5231B-7-F
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MM5Z5V1ST1G
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