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Renesas HZU18B3TRF-E
- Part No.:
- HZU18B3TRF-E
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
HZU18B3TRF-E.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:14,352
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Product details
Overview
HZU18B3TRF-E from Renesas Electronics is a silicon planar Zener diode in ultra-small URP (SC-76A) surface-mount package, designed for precision voltage stabilization at 18.21–19.03 V with 2 mA test current, 13.0 Ω dynamic resistance, and ±5% tolerance (Grade B3), commonly used in low-power reference and overvoltage protection circuits.
For engineers reviewing the HZU18B3TRF-E datasheet, HZU18B3TRF-E pinout, HZU18B3TRF-E application, or HZU18B3TRF-E equivalent, key selection criteria include Zener voltage accuracy at 2 mA, thermal stability across –55°C to +150°C, 200 mW power dissipation limit, and compatibility with automated SMT assembly due to its 0.8 mm × 0.8 mm URP footprint.
Technical Context
This Zener diode operates in reverse-biased breakdown mode with a nominal Zener voltage of 18.6 V (midpoint of 18.21–19.03 V range), specified under pulsed test conditions (PW = 40 ms) to minimize self-heating effects. Its temperature coefficient is approximately –0.04 %/°C, indicating slight negative drift above room temperature.
The device features a planar junction structure for stable long-term performance and low leakage, with reverse current limited to ≤2 μA at VR = 15.0 V. It is rated for junction temperatures up to 150°C and storage from –55°C to +150°C, supporting industrial-grade environmental resilience.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18.21–19.03 V at IZ = 2 mA - defines stable regulation window for low-current references |
| Dynamic Resistance (rd) | 13.0 Ω at IZ = 2 mA - determines output impedance and load regulation sensitivity |
| Power Dissipation (Pd) | 200 mW at Ta = 25°C - sets maximum continuous DC or pulsed power handling capability |
| Reverse Current (IR) | ≤2 μA at VR = 15.0 V - ensures minimal leakage below breakdown threshold |
| Junction Temperature (Tj) | –55°C to +150°C - enables operation in extended industrial ambient environments |
| Package | URP (SC-76A), 0.8 mm × 0.8 mm - supports high-density PCB layouts and reflow-compatible SMT assembly |
Pinout & Package
Ultra-small Resin Package (URP), also known as SC-76A, measures 0.8 mm × 0.8 mm with 0.45 mm height and weighs 0.004 g. Cathode marked by dot on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Connected to regulated output node; polarity must be observed for correct reverse-bias operation |
| 2 | Anode | Connected to ground or lower-potential rail; completes bias path for Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small URP (SC-76A) package | 0.8 mm × 0.8 mm footprint enables high-density layout in space-constrained portable and IoT devices |
| Grade B3 Zener tolerance | ±2.2% (18.21–19.03 V) provides tighter regulation than standard B-grade parts for improved reference accuracy |
| Pulsed testing compliance | Specified with 40 ms pulse width to ensure parameter validity under transient thermal conditions |
| Taped and reel packaging | TRF taping (3,000 pcs/reel) supports automated pick-and-place manufacturing without manual handling |
Applications
| Portable Power Monitoring | Industrial Sensor Reference |
|---|---|
Use Scenario: Battery voltage monitoring circuit in handheld medical devices requiring stable 18.6 V reference for ADC scaling. IC Role / Device Role / Timing Role: Zener diode provides fixed reference voltage to analog front-end comparator and ADC input stage. Use Value: Enables accurate battery state-of-charge estimation within ±2.2% voltage error across –20°C to +70°C operating range. |
Use Scenario: Precision voltage reference for 4–20 mA loop-powered pressure transmitters in factory automation. IC Role / Device Role / Timing Role: Stabilizes excitation voltage for bridge sensor interface ICs in harsh industrial environments. Use Value: Maintains reference stability despite ambient temperature swings up to 85°C, reducing calibration drift. |
| USB-C Overvoltage Clamp | Low-Power MCU Reset Circuit |
Use Scenario: Secondary overvoltage protection stage downstream of TVS diodes in USB-C PD port designs. IC Role / Device Role / Timing Role: Clamps transient surges above 19.03 V to protect downstream PMIC and controller ICs. Use Value: Adds fine-grained clamping layer with 13.0 Ω dynamic resistance, limiting let-through energy during fast transients. |
Use Scenario: Brown-out detection and reset generation for 32-bit microcontrollers operating from 18–20 V auxiliary rails. IC Role / Device Role / Timing Role: Supplies clean, temperature-stable trigger threshold to dedicated reset supervisor IC. Use Value: Ensures deterministic reset assertion at 18.21 V with <2 μA leakage, minimizing false triggers during supply ripple. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage stabilization applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C18LT1G | 18 V nominal, ±5% tolerance, SOT-23 package (1.3 mm × 1.3 mm), 350 mW Pd | Larger footprint and higher power rating; less suitable for ultra-dense layouts | Choose when higher power margin or legacy SOT-23 compatibility is required |
| MMSZ5246B-TP | 18 V nominal, ±5% tolerance, SOD-123 package (2.7 mm × 1.4 mm), 500 mW Pd | Significantly larger size and higher thermal mass; better for higher-current stabilization | Prefer when board space allows and >200 mW dissipation is needed |
Compared with BZX84-C18LT1G and MMSZ5246B-TP, the HZU18B3TRF-E offers the smallest footprint (0.8 mm × 0.8 mm) and tightest Grade B3 tolerance (±2.2%), making it optimal for miniaturized, high-accuracy voltage reference designs where space and precision outweigh raw power handling needs.
Availability
HZU18B3TRF-E is available at Aetrix Electronics and suitable for portable power monitoring, industrial sensor reference, USB-C overvoltage clamp, and low-power MCU reset circuits requiring stable component supply and consistent Zener voltage performance.
Supply support for HZU18B3TRF-E 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
Renesas Electronics is a global semiconductor manufacturer specializing in microcontrollers, analog, and power devices, with strong focus on automotive, industrial, and IoT applications.
The HZU Series belongs to Renesas' silicon planar Zener diode product line, engineered for compact, high-reliability voltage stabilization in surface-mount applications demanding tight tolerance and thermal stability.
FAQ
What is the exact Zener voltage range for HZU18B3TRF-E?
The HZU18B3TRF-E has a guaranteed Zener voltage range of 18.21 V to 19.03 V when tested at IZ = 2 mA, corresponding to Grade B3 tolerance per the Renesas preliminary datasheet R07DS0423EJ1000 Rev.10.00. This 4.4% span reflects tighter specification than standard B-grade variants in the same series.
Is HZU18B3TRF-E suitable for continuous DC operation?
Yes, the HZU18B3TRF-E supports continuous DC operation up to 200 mW at 25°C ambient, but derating is required above 25°C per Fig.3 in the datasheet. At 70°C ambient, maximum allowable power drops to ~150 mW, so design must ensure IZ × VZ remains within derated limits for reliable long-term use of HZU18B3TRF-E.
What does the "TRF" suffix indicate in HZU18B3TRF-E?
The "TRF" suffix denotes tape-and-reel packaging with 3,000 units per reel and STSP0002ZA-A carrier tape format, optimized for automated SMT placement. It confirms the part is supplied in industry-standard TRF taping - not bulk or ammo-pack - and is fully compatible with pick-and-place equipment used in high-volume manufacturing of HZU18B3TRF-E.
How does the temperature coefficient affect HZU18B3TRF-E performance?
The HZU18B3TRF-E exhibits a typical temperature coefficient of –0.04 %/°C near 18.6 V, meaning its Zener voltage decreases by ~7.4 mV per °C rise. This negative drift is confirmed in Fig.2 of the datasheet and must be accounted for in precision reference designs where ambient temperature varies beyond 25°C, especially in unregulated environments using HZU18B3TRF-E.
Can HZU18B3TRF-E replace older HZU18B variants?
Yes, the HZU18B3TRF-E is a direct functional upgrade to earlier HZU18B (Grade B) parts, offering tighter voltage tolerance (±2.2% vs. ±5%) and identical URP package, pinout, and absolute ratings. No PCB changes are required, and HZU18B3TRF-E delivers improved regulation accuracy in all applications previously using HZU18B.
HZU18B3TRF-E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- -
- Tolerance:
- -
- Power - Max:
- -
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
HZU18B3TRF-E FAQ
1.How can I place an order for HZU18B3TRF-E through Aetrix?
Please submit a Request for Quotation (RFQ) for HZU18B3TRF-E 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 HZU18B3TRF-E reliable?
The price and inventory of HZU18B3TRF-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZU18B3TRF-E is usually 5 days.
3.What payment methods are accepted for HZU18B3TRF-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZU18B3TRF-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HZU18B3TRF-E?
HZU18B3TRF-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HZU18B3TRF-E 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 HZU18B3TRF-E?
For technical support, including HZU18B3TRF-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZU18B3TRF-E requirements.
6.How does Aetrix verify that HZU18B3TRF-E is sourced from the original manufacturer or authorized distributors?
All HZU18B3TRF-E 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 HZU18B3TRF-E meets industry standards.
7.What is the process for return or replacement of HZU18B3TRF-E?
All HZU18B3TRF-E units undergo pre-shipment inspection (PSI). If there is an issue with HZU18B3TRF-E, 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 HZU18B3TRF-E part is unused and in its original packaging.
Return procedure for HZU18B3TRF-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
HZU18B3TRF-E Tags
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