My Inquiry
My Account
Nexperia USA Inc. HPZR-C18-QX
- Part No.:
- HPZR-C18-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123W
- Datasheet:
-
HPZR-C18-QX.pdf
- Description:
- DIODE ZENER 18V 682MW SOD123W
- Quantity:
- Payment:
- Shipping:
Inventory:2,750
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
HPZR-C18-QX from Nexperia is a high-power Zener voltage regulator diode in CFP3 (SOD123W) package, rated for 18 V nominal working voltage at IZ = 1 mA, with ±5 % tolerance, 5.5 W total power dissipation at Tsp = 75 °C, and 30 kV ESD rating per IEC 61000-4-2 (contact discharge), used for precision voltage regulation in automotive power rails.
For engineers reviewing the HPZR-C18-QX datasheet, HPZR-C18-QX pinout, HPZR-C18-QX application, or HPZR-C18-QX equivalent, this device supports stable low-current regulation in AEC-Q101-compliant automotive subsystems where thermal robustness, surge immunity, and tight voltage tolerance are critical selection criteria.
Technical Context
This Zener diode operates in reverse breakdown mode to clamp or regulate voltage across its terminals. Its 18 V nominal Zener voltage (VZ = 16.7–18.5 V at IZ = 1 mA) and low differential resistance (RZ = 29.15 Ω) ensure stable reference performance under varying load conditions.
Thermal design is enabled by low Rth(j-sp) = 18 K/W (to solder point) and Rth(j-a) = 70 K/W (on ceramic PCB), supporting reliable operation up to Tj = 175 °C. It withstands non-repetitive peak reverse power of 800 W for ≤100 µs pulses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VZ (Nominal) | 18 V - precise regulation point at IZ = 1 mA, with min/max range 16.7–18.5 V |
| Ptot | 5500 mW - maximum DC power dissipation at solder point temperature Tsp = 75 °C |
| RZ | 29.15 Ω - low dynamic impedance ensures minimal output voltage variation under load current changes |
| IR @ VR | 0.1 µA max @ 15 V - ultra-low leakage enables high-impedance biasing and low standby power loss |
| ESD Rating | 30 kV - contact discharge per IEC 61000-4-2, enabling direct placement on exposed automotive interfaces without external protection |
| Tj Max | 175 °C - junction temperature limit compatible with under-hood automotive environments |
| Rth(j-sp) | 18 K/W - thermal resistance to solder point confirms efficient heat transfer into PCB copper pad |
Pinout & Package
HPZR-C18-QX uses the CFP3 (SOD123W) surface-mount plastic package: 2.6 mm × 1.7 mm × 1.0 mm body, flat lead profile, low-profile SMD construction optimized for automated assembly and thermal conduction via cathode pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Negative terminal; marked by bar on package; connects to regulated voltage rail or ground return path |
| 2 | Anode (A) | Positive terminal; ties to unregulated input; reverse-biased configuration enables Zener clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use per stress test standard, enabling deployment in engine control, lighting, and ADAS power domains |
| 5.5 W power handling | Enables regulation in higher-current auxiliary rails (e.g., 300 mA @ 18 V) without external heatsinking on FR4 or ceramic PCBs |
| ±5 % VZ tolerance | Reduces need for post-production trimming in voltage reference circuits, improving BOM and test efficiency |
| 30 kV ESD immunity | Eliminates need for discrete TVS protection on board-level inputs subject to human contact or cable coupling |
| Low RZ (29.15 Ω) | Maintains regulation accuracy within ±0.3 V over 1–10 mA load current swing, critical for sensor biasing |
Applications
| Automotive Body Control Module (BCM) | LED Headlamp Driver Reference |
|---|---|
|
Use Scenario: Stable 18 V reference for microcontroller I/O supply monitoring and CAN transceiver biasing in BCM subassemblies. IC Role / Device Role / Timing Role: Voltage regulation and overvoltage clamping element protecting downstream logic from battery transients. Use Value: Maintains functional safety integrity during load dump events (ISO 7637-2 Pulse 5a) due to 800 W non-repetitive surge capability and 175 °C Tj rating. |
Use Scenario: Precision bias voltage source for current-sense amplifier feedback in constant-current LED driver stages. IC Role / Device Role / Timing Role: Zener-based shunt reference providing stable 18 V node for op-amp common-mode input range definition. Use Value: Low 29.15 Ω RZ and 0.1 µA leakage minimize drift and offset error in analog sensing paths under thermal cycling. |
| Infotainment Power Sequencing | ADAS Camera Module Bias Supply |
|
Use Scenario: Voltage supervisor input reference for power-on reset (POR) circuitry sequencing multiple SoC voltage rails. IC Role / Device Role / Timing Role: Regulated threshold generator defining POR trip point independent of main 12 V supply fluctuations. Use Value: ±5 % VZ tolerance and <1 V forward voltage enable deterministic reset timing across -40 °C to +125 °C ambient. |
Use Scenario: Low-noise analog supply rail stabilization for image sensor ADC reference and PLL VCO tuning voltage. IC Role / Device Role / Timing Role: Shunt regulator filtering ripple and suppressing conducted noise on sensitive analog voltage nodes. Use Value: 30 kV ESD rating protects camera module from electrostatic discharge during handling and installation without added protection components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C18 | 300 mW Ptot, SOT23 package, RZ = 40 Ω, no AEC-Q101 qualification | Limited to low-power consumer or industrial signal conditioning; unsuitable for automotive under-hood use | Select only for cost-sensitive non-automotive designs where thermal and reliability requirements are relaxed |
| MMSZ5245B | 500 mW Ptot, SOD-123 package, VZ = 18 V ±5 %, RZ = 35 Ω, no automotive qualification | Acceptable for board-level voltage clamping in commercial-grade power supplies but lacks surge and thermal margin | Choose when footprint compatibility with SOD-123 is required and 5.5 W dissipation is not needed |
Compared with BZX84-C18 and MMSZ5245B, HPZR-C18-QX delivers 11× higher power handling, 35 % lower dynamic impedance, and full AEC-Q101 compliance-making it the sole option for thermally demanding, safety-critical automotive voltage regulation where long-term reliability under transient stress is mandatory.
Availability
HPZR-C18-QX is available at Aetrix Electronics and suitable for automotive body electronics, LED lighting systems, infotainment power management, and ADAS camera modules requiring stable component supply with guaranteed AEC-Q101 compliance and extended thermal performance.
Supply support for HPZR-C18-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 essential semiconductors, delivering high-performance, reliable components for automotive, industrial, and consumer markets with emphasis on efficiency and miniaturization.
HPZR-C18-QX belongs to the HPZR-Q series of high-power Zener regulators designed specifically for automotive-grade voltage stabilization where high surge immunity, tight tolerance, and extended temperature operation are mandatory.
FAQ
What is the maximum continuous reverse current the HPZR-C18-QX can sustain at 18 V?
The HPZR-C18-QX is rated for a maximum continuous forward current (IF) of 400 mA, but as a Zener diode operating in reverse breakdown, its steady-state current is governed by power dissipation limits. At 18 V, the maximum sustainable reverse current is 306 mA (5.5 W ÷ 18 V), assuming Tsp = 75 °C and zero-lead-length measurement conditions per datasheet Section 4.
Does HPZR-C18-QX require a heatsink for operation at full 5.5 W dissipation?
No external heatsink is required. The device achieves 5.5 W DC power dissipation at Tsp = 75 °C using only the cathode pad thermal path on an FR4 PCB (1 cm² tin-plated copper). Its Rth(j-sp) = 18 K/W enables sufficient heat transfer through the solder joint into the PCB copper, as verified in Thermal Characteristics Table 8.
How does the 30 kV ESD rating translate to real-world board-level protection?
The 30 kV rating is measured per IEC 61000-4-2 contact discharge directly at the cathode solder point. This means HPZR-C18-QX can absorb full ESD events without degradation when placed adjacent to connectors or switches in automotive cabins or exterior modules-eliminating the need for additional TVS diodes in many Class III (interior) and Class II (engine bay) applications.
Can HPZR-C18-QX replace older Zener diodes like 1N4746A in existing designs?
Yes, with layout adaptation: HPZR-C18-QX matches the 1N4746A's 18 V nominal Zener voltage and ±5 % tolerance, but uses CFP3 (SOD123W) instead of DO-41. Its 5.5 W rating exceeds 1N4746A's 1 W, enabling higher current capability-but requires updated PCB footprint and reflow profile per Figure 11 in the datasheet.
HPZR-C18-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- HPZR-Q
- Package/Case:
- SOD-123W
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 682 mW
- Impedance (Max) (Zzt):
- 29.15 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 15 V
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 100 mA
- Operating Temperature:
- 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123W
HPZR-C18-QX FAQ
1.How can I place an order for HPZR-C18-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for HPZR-C18-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 HPZR-C18-QX reliable?
The price and inventory of HPZR-C18-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HPZR-C18-QX is usually 5 days.
3.What payment methods are accepted for HPZR-C18-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HPZR-C18-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HPZR-C18-QX?
HPZR-C18-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HPZR-C18-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 HPZR-C18-QX?
For technical support, including HPZR-C18-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HPZR-C18-QX requirements.
6.How does Aetrix verify that HPZR-C18-QX is sourced from the original manufacturer or authorized distributors?
All HPZR-C18-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 HPZR-C18-QX meets industry standards.
7.What is the process for return or replacement of HPZR-C18-QX?
All HPZR-C18-QX units undergo pre-shipment inspection (PSI). If there is an issue with HPZR-C18-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 HPZR-C18-QX part is unused and in its original packaging.
Return procedure for HPZR-C18-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
HPZR-C18-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…
