My Inquiry
My Account
Nexperia USA Inc. BZX384-A51X
- Part No.:
- BZX384-A51X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-A51X.pdf
- Description:
- DIODE ZENER 51V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:2,250
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX384-A51X from Nexperia is a ±1 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 51 V nominal breakdown voltage at 5 mA test current, 300 mW total power dissipation, and 40 W non-repetitive peak reverse power. It serves as a precision reference or overvoltage clamp in low-power analog and digital supply rails.
For engineers reviewing the BZX384-A51X datasheet, BZX384-A51X pinout, BZX384-A51X application, or BZX384-A51X equivalent, key selection criteria include its 51 V Zener voltage with ±1 % tolerance, differential resistance of 400 Ω at 5 mA, temperature coefficient of +0.05 mV/K, and cathode-anode polarity marking on the SOD323 body.
Technical Context
This device operates in reverse-biased Zener breakdown mode, delivering stable voltage regulation across load and line variations within its 250 mA forward current and 40 W surge capability limits. Its thermal resistance from junction to ambient is 415 K/W on FR4 PCB, enabling operation up to 150 °C junction temperature.
The BZX384-A51X exhibits a positive temperature coefficient (+0.05 mV/K) at IZ = 2 mA, indicating minimal voltage drift over temperature, and maintains ≤2 μA reverse leakage at VR = 39.8 V, supporting low-quiescent-current biasing in precision circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 50.49 V to 51.51 V at IZ = 5 mA - defines regulated output voltage with ±1 % accuracy under standard test conditions |
| Differential Resistance (rdif) | 400 Ω max at IZ = 5 mA - determines regulation stiffness and output impedance in feedback or reference paths |
| Total Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard FR4 PCB |
| Non-repetitive Peak Reverse Power (PZSM) | 40 W for tp = 100 μs - enables transient overvoltage clamping without failure during short surges |
| Reverse Current (IR) | ≤2 μA at VR = 39.8 V - ensures minimal leakage in high-impedance bias networks or standby circuits |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - supports use as forward-biased clamp or LED driver series element |
| Temperature Coefficient (SZ) | +0.05 mV/K at IZ = 2 mA - indicates near-zero voltage drift over industrial temperature range |
Pinout & Package
Package: SOD323 (SC-76), surface-mount plastic package with 2 leads, 2.7 mm × 1.6 mm footprint, 0.45 mm typical height, and cathode marked by bar on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; reverse-bias anode-to-cathode voltage establishes Zener conduction |
| 2 | Anode (A) | Connected to ground or lower-potential rail; current flows from cathode to anode during regulation |
Key Features
| Feature | Design Value |
|---|---|
| ±1 % Zener voltage tolerance | Enables direct replacement in precision reference designs without recalibration or trimming |
| Low differential resistance (400 Ω) | Minimizes output voltage variation under changing load current in shunt regulator configurations |
| 40 W surge rating (100 μs) | Provides robust ESD and transient immunity in I/O protection circuits without external TVS stacking |
| SOD323 compact footprint | Supports high-density PCB layouts in space-constrained consumer and portable electronics |
| 150 °C maximum junction temperature | Allows reliable operation in thermally demanding environments such as automotive under-hood modules |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
|
Use Scenario: Providing stable 51 V reference for ADC voltage scaling or DAC output calibration in industrial sensor signal chains. IC Role / Device Role / Timing Role: Shunt voltage reference connected between supply rail and ground, sinking excess current to maintain precise node voltage. Use Value: ±1 % initial accuracy and +0.05 mV/K tempco ensure <±0.5 % total error over –40 °C to +85 °C without trimming. |
Use Scenario: Protecting microcontroller I/O pins from 60 V transients induced by relay coil flyback or motor commutation noise. IC Role / Device Role / Timing Role: Bidirectional clamp-conducts in reverse during overvoltage, forward during negative excursions beyond VF. Use Value: 40 W non-repetitive surge rating absorbs 100 μs spikes without degradation, eliminating need for larger TVS devices. |
| Current Source Bias | Linear Regulator Feedback |
|
Use Scenario: Setting bias current for op-amp input stages or transistor amplifiers requiring stable 51 V headroom. IC Role / Device Role / Timing Role: Constant-voltage element in series with resistor to generate fixed current independent of supply variation. Use Value: 300 mW power rating allows ≥5.9 mA bias current (51 V / 8.6 kΩ) with margin, supporting low-noise analog front-ends. |
Use Scenario: Adjusting output voltage of adjustable LDOs (e.g., TLV707) via feedback divider where top resistor connects to 51 V reference. IC Role / Device Role / Timing Role: Precision voltage source replacing resistive divider tap, improving load regulation and ripple rejection. Use Value: 400 Ω differential resistance reduces sensitivity to feedback current changes, maintaining ±0.1 % output stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B51 | ±2 % tolerance (49.95 V–52.05 V), same package and Ptot | Lower cost; acceptable where tighter regulation not required | Select when ±2 % accuracy suffices and BOM cost reduction is prioritized |
| MMSZ5257B | ±5 % tolerance (48.45 V–53.55 V), SOD-123 package, 500 mW Ptot | Larger footprint, higher power, wider tolerance | Choose for higher continuous power needs or legacy SOD-123 board compatibility |
Compared with BZX384-B51 and MMSZ5257B, the BZX384-A51X delivers the tightest voltage accuracy (±1 %) in the smallest footprint (SOD323), making it optimal for space-constrained, high-precision reference designs where cost is secondary to performance.
Availability
BZX384-A51X is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable medical monitors, and telecom line-card power supervision requiring stable component supply and traceable sourcing.
Supply support for BZX384-A51X 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
Nexperia is a global semiconductor expert focused on high-volume, high-reliability logic, discrete, and MOSFET solutions, headquartered in Nijmegen, Netherlands.
The BZX384 series belongs to Nexperia's precision Zener diode product line, engineered specifically for low-power voltage reference and overvoltage protection in consumer, industrial, and communications equipment.
FAQ
What is the maximum continuous reverse current the BZX384-A51X can sustain at 51 V?
The BZX384-A51X is not rated for continuous reverse current at full Zener voltage. Its maximum continuous power dissipation is 300 mW, limiting sustained reverse current to approximately 5.9 mA (300 mW ÷ 51 V). Exceeding this risks thermal runaway unless heatsinking or derating is applied per the datasheet's thermal resistance curves.
Can BZX384-A51X be used in series to achieve higher regulated voltages?
Yes, multiple BZX384-A51X diodes may be connected in series to obtain higher reference voltages (e.g., two in series yield ~102 V), but voltage matching and thermal coupling must be considered. Mismatched units cause uneven voltage distribution, and shared thermal environment is critical to prevent thermal runaway in one device.
Does the BZX384-A51X have automotive qualification?
No. The BZX384-A51X is explicitly designated as non-automotive qualified per Nexperia's revision history (Rev. 4, January 2023). For automotive applications, Nexperia offers separate -Q qualified variants (e.g., BZX384-A51-Q), which undergo AEC-Q200 stress testing and have different packaging and traceability requirements.
How does the +0.05 mV/K temperature coefficient affect long-term stability?
The +0.05 mV/K coefficient means voltage increases by only 2.55 mV over a 51 K rise (–40 °C to +85 °C), contributing <±0.005 % drift relative to 51 V. This near-zero drift-combined with ±1 % initial tolerance-ensures total voltage error remains within ±0.5 % across the full industrial temperature range without active compensation.
BZX384-A51X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX384
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 51 V
- Tolerance:
- ±1%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 35.7 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 100 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX384-A51X FAQ
1.How can I place an order for BZX384-A51X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-A51X 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 BZX384-A51X reliable?
The price and inventory of BZX384-A51X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX384-A51X is usually 5 days.
3.What payment methods are accepted for BZX384-A51X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-A51X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-A51X?
BZX384-A51X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-A51X 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 BZX384-A51X?
For technical support, including BZX384-A51X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-A51X requirements.
6.How does Aetrix verify that BZX384-A51X is sourced from the original manufacturer or authorized distributors?
All BZX384-A51X 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 BZX384-A51X meets industry standards.
7.What is the process for return or replacement of BZX384-A51X?
All BZX384-A51X units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-A51X, 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 BZX384-A51X part is unused and in its original packaging.
Return procedure for BZX384-A51X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-A51X 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
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
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…
