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NXP Semiconductors BZX84-B24/LF1R
- Part No.:
- BZX84-B24/LF1R
- Manufacturer:
- NXP Semiconductors
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84-B24/LF1R.pdf
- Description:
- DIODE ZENER 24V 250MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:7,124
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Product details
Overview
BZX84-B24/LF1R from NXP Semiconductors is a ±2 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, rated for 24 V nominal breakdown voltage at 5 mA, 250 mW total power dissipation, and AEC-Q101 qualification for automotive use.
For engineers reviewing the BZX84-B24/LF1R datasheet, BZX84-B24/LF1R pinout, BZX84-B24/LF1R application, or BZX84-B24/LF1R equivalent, this page delivers verified electrical parameters, thermal limits, reverse current behavior at 22 V, differential resistance of 60 Ω, and temperature coefficient of +18.4 mV/K - all critical for precision biasing, overvoltage clamping, and reference design in constrained PCB layouts.
Technical Context
The BZX84-B24/LF1R operates as a two-terminal shunt regulator, maintaining stable reverse-biased conduction above its 23.5–24.5 V breakdown range. Its 60 Ω differential resistance ensures low dynamic impedance under 5 mA test current, while the +18.4 mV/K positive temperature coefficient enables predictable drift compensation in temperature-varying environments.
Designed for surface-mount operation on FR4 PCBs with single-sided copper, it supports non-repetitive peak reverse power dissipation up to 40 W (100 µs pulse) and junction temperatures from −65 °C to +150 °C. The device is not connected internally at pin 2, confirming true two-terminal functionality despite its three-pin SOT23 footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VZ) | 23.5 V to 24.5 V at IZ = 5 mA - defines precise clamping threshold for 24 V rail protection |
| Total Power Dissipation (Ptot) | 250 mW at Tamb ≤ 25 °C - sets continuous DC bias limit without heatsinking |
| Differential Resistance (rdif) | 60 Ω at IZ = 5 mA - determines output impedance stability under load variation |
| Reverse Current (IR) | 0.05 µA max at VR = 22 V - ensures minimal leakage in high-impedance reference nodes |
| Temperature Coefficient (SZ) | +18.4 mV/K - quantifies voltage drift per degree Celsius for thermal error budgeting |
| Non-repetitive Peak Reverse Current (IZSM) | 1.25 A at tp = 100 µs - supports transient surge suppression in ESD-critical circuits |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - confirms low-loss forward conduction during polarity reversal events |
Pinout & Package
SOT23 (TO-236AB) plastic surface-mounted package, 3-lead, 2.8 mm × 1.4 mm footprint, 1.1 mm height, with standard 4 mm tape-and-reel packing (3000 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Anode connection | DC input node for reverse-bias configuration; connects to lower-potential side of regulated circuit |
| 2 (n.c.) | Not connected | No internal bond wire; must remain unconnected on PCB to avoid parasitic coupling or mechanical stress |
| 3 (Cathode) | Cathode connection | Reference/output node; ties to regulated voltage rail or feedback point in shunt regulator topology |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity, and mechanical shock testing |
| ±2 % voltage tolerance | Tighter regulation than ±5 % (BZX84-C) variants, enabling higher-accuracy references without trimming |
| Low differential resistance | 60 Ω ensures minimal output voltage shift across 1–10 mA operating range in feedback loops |
| FR4 PCB thermal performance | Rth(j-a) = 500 K/W allows direct mounting without thermal vias in low-power applications |
| Non-repetitive surge capability | 40 W peak power handling supports IEC 61000-4-2 ESD protection up to ±15 kV contact discharge |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Stabilizing 24 V supply rails in door module ECUs exposed to load dump transients up to 40 V. IC Role / Device Role / Timing Role: Shunt regulator providing overvoltage clamp and reference voltage for LDO enable circuitry. Use Value: Maintains <250 mW dissipation during 24 V nominal operation while surviving 40 W surge pulses per ISO 7637-2 Pulse 5a. |
Use Scenario: Biasing precision op-amp inputs in 4–20 mA transmitter front-ends operating from 24 V loop supply. IC Role / Device Role / Timing Role: Low-leakage (0.05 µA) voltage reference establishing common-mode level for analog signal chain. Use Value: Enables <0.1 % full-scale error contribution from reference drift due to +18.4 mV/K coefficient and 60 Ω rdif. |
| Consumer Power Adapter Feedback | Telecom Line Interface Unit (LIU) |
Use Scenario: Providing secondary-side voltage reference in isolated flyback converters for USB-C PD adapters. IC Role / Device Role / Timing Role: Zener-based optocoupler feedback node regulating output via TL431-compatible control loop. Use Value: Delivers stable 24 V reference with <1 % tolerance drift over −40 °C to +85 °C ambient, reducing need for post-production calibration. |
Use Scenario: Protecting line driver ICs from induced surges on POTS telephone lines subject to lightning-induced transients. IC Role / Device Role / Timing Role: Fast-response clamping element diverting >1.25 A surge currents away from sensitive transceiver pins. Use Value: Limits voltage excursion to ≤24.5 V during 100 µs surges, preventing latch-up in SLIC devices per GR-909 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5249BS-7-F | 24 V, ±5 % tolerance, 350 mW Ptot, SOT23 package, no AEC-Q101 qualification | Higher power rating but looser tolerance; suitable for non-automotive consumer power rails | Select when cost sensitivity outweighs automotive qualification and tighter voltage accuracy |
| Vishay BZX84-C24-TP | 24 V, ±5 % tolerance, 300 mW Ptot, SOT23, AEC-Q101 qualified | Same automotive qualification but wider tolerance; higher leakage (0.1 µA at 22 V) | Choose where robustness matters more than precision - e.g., bulk clamping in motor drive gate drivers |
Compared with MMBZ5249BS-7-F and BZX84-C24-TP, the BZX84-B24/LF1R provides superior voltage accuracy (±2 % vs. ±5 %) and lower leakage (0.05 µA), making it optimal for precision reference and automotive-compliant designs where regulation tightness directly impacts system-level measurement fidelity.
Availability
BZX84-B24/LF1R is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and telecom line protection requiring stable component supply with AEC-Q101 assurance and consistent ±2 % voltage tolerance.
Supply support for BZX84-B24/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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with core expertise in analog, power management, and interface technologies.
The BZX84 series was developed to deliver compact, AEC-Q101-qualified Zener regulation for space-constrained automotive and industrial control systems requiring reliable voltage reference and transient suppression in SOT23 footprint.
FAQ
What is the exact breakdown voltage range for BZX84-B24/LF1R?
The BZX84-B24/LF1R has a guaranteed breakdown voltage range of 23.5 V to 24.5 V at 5 mA test current, reflecting its ±2 % tolerance specification. This range is validated per NXP's Product Data Sheet Rev. 6 (2014) Table 8, and applies under Tj = 25 °C conditions. The BZX84-B24/LF1R maintains this tolerance across its qualified operating temperature range.
Is BZX84-B24/LF1R suitable for automotive applications?
Yes, the BZX84-B24/LF1R is AEC-Q101 qualified per Section 8.1 of the NXP datasheet, confirming compliance with stress tests for discrete semiconductors in automotive environments. Its construction, thermal ratings, and reliability validation make the BZX84-B24/LF1R appropriate for under-hood and cabin modules where temperature cycling and long-term stability are critical.
What is the maximum reverse leakage current for BZX84-B24/LF1R at 22 V?
The BZX84-B24/LF1R exhibits a maximum reverse leakage current of 0.05 µA at VR = 22 V and Tj = 25 °C, as specified in Table 8 of the NXP datasheet. This ultra-low leakage supports high-impedance reference nodes and minimizes error in precision analog circuits where the BZX84-B24/LF1R serves as a stable bias source.
Does BZX84-B24/LF1R have a connected third pin?
No, pin 2 of the BZX84-B24/LF1R is explicitly marked "n.c." (not connected) in Table 2 of the NXP datasheet. It has no internal bond wire or silicon connection. PCB layout must leave this terminal unconnected to prevent mechanical stress or unintended coupling - the BZX84-B24/LF1R functions as a true two-terminal device despite its three-pin SOT23 package.
What is the thermal resistance from junction to ambient for BZX84-B24/LF1R?
The BZX84-B24/LF1R has a thermal resistance from junction to ambient (Rth(j-a)) of 500 K/W when mounted on a standard FR4 PCB with single-sided copper and tin-plated finish, per Table 6 of the NXP datasheet. This value assumes free-air convection and defines the worst-case temperature rise (ΔT = P × Rth) for derating calculations at elevated ambient temperatures.
BZX84-B24/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):
- 24 V
- Tolerance:
- ±2%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 16.8 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-B24/LF1R FAQ
1.How can I place an order for BZX84-B24/LF1R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84-B24/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-B24/LF1R reliable?
The price and inventory of BZX84-B24/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-B24/LF1R is usually 5 days.
3.What payment methods are accepted for BZX84-B24/LF1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-B24/LF1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84-B24/LF1R?
BZX84-B24/LF1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84-B24/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-B24/LF1R?
For technical support, including BZX84-B24/LF1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-B24/LF1R requirements.
6.How does Aetrix verify that BZX84-B24/LF1R is sourced from the original manufacturer or authorized distributors?
All BZX84-B24/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-B24/LF1R meets industry standards.
7.What is the process for return or replacement of BZX84-B24/LF1R?
All BZX84-B24/LF1R units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-B24/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-B24/LF1R part is unused and in its original packaging.
Return procedure for BZX84-B24/LF1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84-B24/LF1R Tags
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