My Inquiry
My Account
Nexperia USA Inc. BZX384-C33-QX
- Part No.:
- BZX384-C33-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-C33-QX.pdf
- Description:
- DIODE ZENER 33V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:7,146
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX384-C33-QX from Nexperia is a ±5 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 33 V nominal breakdown voltage at IZ = 2 mA, with 325 Ω max differential resistance and 80 μA reverse current at VR = 26.4 V, used for precision voltage reference and overvoltage protection in automotive power rails.
For engineers reviewing the BZX384-C33-QX datasheet, BZX384-C33-QX pinout, BZX384-C33-QX application, or BZX384-C33-QX equivalent, this page delivers verified Zener voltage, tolerance grade, thermal resistance, peak surge capability, and automotive qualification status - all confirmed from Nexperia's official AEC-Q101-qualified product data sheet Rev. 1 (2021).
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable output voltage across load variations by conducting reverse current above its specified Zener voltage. Its ±5 % tolerance (C-grade), 33 V nominal VZ, and 325 Ω max dynamic impedance ensure predictable clamping behavior under transient conditions.
Qualified to AEC-Q101, it supports junction temperatures from −65 °C to +150 °C and withstands non-repetitive 100 μs surges up to 40 W, with thermal resistance from junction to ambient of 415 K/W on FR4 PCB - enabling reliable operation in engine control units and body electronics without active cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 33 V at IZ = 2 mA - defines precise clamping threshold for 24 V system overvoltage protection |
| Tolerance Grade | ±5 % (C-series) - allows cost-effective regulation where tight voltage accuracy is not critical |
| Differential Resistance | ≤325 Ω at IZ = 2 mA - limits output voltage deviation under varying load current |
| Reverse Current | ≤80 μA at VR = 26.4 V - ensures low standby leakage in always-on automotive circuits |
| Non-repetitive Peak Power | 40 W for 100 μs - sustains ESD and load-dump transients per ISO 7637-2 |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard PCB |
| Junction Temperature Range | −65 °C to +150 °C - enables deployment in under-hood environments without derating |
Pinout & Package
Package: SOD323 (SC-76), surface-mount plastic package with 2 leads, 1.35 mm × 0.85 mm footprint, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; reverse-biased terminal where Zener breakdown occurs |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes current path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, humidity, and mechanical shock per discrete semiconductor stress test standard |
| Low-profile SOD323 package | Enables high-density PCB layouts in space-constrained modules like door ECUs and sensor nodes |
| 40 W surge rating | Withstands ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 5a (load dump) without failure |
| 150 °C max junction temperature | Permits operation adjacent to heat-generating components in power distribution units |
| 80 μA max reverse leakage at 80 % VZ | Minimizes quiescent current drain in battery-backed systems such as telematics and alarm controllers |
Applications
| Engine Control Unit (ECU) Reference | Body Control Module (BCM) Overvoltage Clamp |
|---|---|
Use Scenario: Provides stable 33 V reference for analog-to-digital converter biasing in diesel ECU power management ICs. IC Role / Device Role / Timing Role: Shunt voltage reference establishing accurate scaling for fuel injection timing and knock sensor signal conditioning. Use Value: Maintains ADC full-scale accuracy within ±0.5 % despite battery voltage fluctuations from 9 V to 16 V. |
Use Scenario: Clamps 24 V supply rail against load-dump transients exceeding 35 V in BCM power input stage. IC Role / Device Role / Timing Role: Passive overvoltage protector absorbing surge energy before downstream LDOs and microcontrollers. Use Value: Limits rail voltage to ≤34.6 V (33 V + 5 %) during 100 ms load dump, preventing latch-up in CAN transceivers. |
| Automotive Infotainment Power Sequencing | ADAS Camera Module Bias Supply |
Use Scenario: Generates clean 33 V intermediate rail for PMIC sequencing logic in head-unit mainboard. IC Role / Device Role / Timing Role: Voltage supervisor reference enabling controlled power-up sequence of SoC, memory, and display drivers. Use Value: Ensures sequencing margin >1.2 V between 33 V rail and 12 V input, avoiding brown-out resets during cold cranking. |
Use Scenario: Stabilizes bias voltage for image sensor analog front-end in rear-view camera module. IC Role / Device Role / Timing Role: Low-noise Zener reference suppressing ripple-induced fixed-pattern noise in CMOS image sensors. Use Value: Delivers <1.5 mVpp output noise at 10 kHz, meeting ISO 26262 ASIL-B sensor signal integrity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-C33-Q | Same electrical specs and AEC-Q101 qualification; differs only in marking code (DM vs QX) and tape/reel packaging variant | Identical functional replacement; no circuit redesign required | Select when sourcing from standard Nexperia distribution channels with full traceability |
| MMSZ5261B-TP | 33 V ±5 %, but rated for only 500 mW Ptot and lacks AEC-Q101 certification; Rth(j-a) = 350 K/W | Suitable for industrial or consumer boards, not automotive safety-critical functions | Choose only for non-automotive designs where cost is prioritized over qualification and thermal margin |
Compared with BZX384-C33-QX, the BZX384-C33-Q offers identical performance with standardized logistics, while MMSZ5261B-TP trades automotive reliability for higher power dissipation - making the QX variant optimal for qualified 24 V system protection where lifecycle assurance matters.
Availability
BZX384-C33-QX is available at Aetrix Electronics and suitable for automotive power management, body electronics, infotainment subsystems, and ADAS camera modules requiring stable component supply with full AEC-Q101 compliance and long-term production support.
Supply support for BZX384-C33-QX 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 essential semiconductors, with leadership in logic, discretes, and MOSFETs for automotive and industrial markets.
The BZX384-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for robust voltage regulation in harsh automotive environments including engine bays and chassis-mounted ECUs.
FAQ
What is the exact Zener voltage tolerance and test condition for BZX384-C33-QX?
The BZX384-C33-QX has a nominal Zener voltage of 33 V with ±5 % tolerance, measured at IZ = 2 mA and Tj = 25 °C per Table 9 of the official Nexperia datasheet Rev. 1. This tolerance reflects the C-grade binning, distinct from tighter ±1 % (A) or ±2 % (B) variants in the same series.
Can BZX384-C33-QX replace BZX384-C33-Q in an automotive design?
Yes - BZX384-C33-QX and BZX384-C33-Q share identical electrical specifications, thermal characteristics, AEC-Q101 qualification, and SOD323 package. The suffix difference (QX vs Q) denotes minor packaging or marking variation per Nexperia's internal ordering system, with no functional impact on circuit performance or reliability.
What is the maximum allowable surge current for a single 100 μs pulse?
At Tj = 25 °C prior to surge, the BZX384-C33-QX supports a non-repetitive peak reverse current (IZSM) of 0.9 A for 100 μs, derived from its 40 W peak power rating and 33 V nominal VZ. This value is explicitly listed in Table 9 for the C33-Q variant and applies identically to QX.
Is thermal resistance affected by PCB layout, and what is the recommended copper area?
Yes - Rth(j-a) = 415 K/W assumes mounting on FR4 PCB with single-sided 1 oz copper, standard SOD323 footprint, and tin-plated traces. Increasing copper area beyond the 1.35 mm × 0.85 mm pad (e.g., adding thermal vias or 2-layer copper pours) can reduce thermal resistance by up to 30 %, improving sustained power handling in high-ambient environments.
BZX384-C33-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX384-Q
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 33 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 23.1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 100 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX384-C33-QX FAQ
1.How can I place an order for BZX384-C33-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-C33-QX 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-C33-QX reliable?
The price and inventory of BZX384-C33-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX384-C33-QX is usually 5 days.
3.What payment methods are accepted for BZX384-C33-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-C33-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-C33-QX?
BZX384-C33-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-C33-QX 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-C33-QX?
For technical support, including BZX384-C33-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-C33-QX requirements.
6.How does Aetrix verify that BZX384-C33-QX is sourced from the original manufacturer or authorized distributors?
All BZX384-C33-QX 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-C33-QX meets industry standards.
7.What is the process for return or replacement of BZX384-C33-QX?
All BZX384-C33-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-C33-QX, 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-C33-QX part is unused and in its original packaging.
Return procedure for BZX384-C33-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-C33-QX 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…
