My Inquiry
My Account
Renesas HZ18-2LTA-E
- Part No.:
- HZ18-2LTA-E
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
HZ18-2LTA-E.pdf
- Description:
- DIODE ZENER 0.4W
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
HZ18-2LTA-E from Renesas Electronics is a silicon planar Zener diode optimized for low-noise voltage regulation in precision analog circuits, with a nominal zener voltage of 17.5–18.3 V, 400 mW power dissipation, and dynamic resistance of 15.0 Ω at 0.5 mA test current - deployed in stabilized power supplies and reference circuits requiring stable biasing under low-current conditions.
For engineers reviewing the HZ18-2LTA-E datasheet, HZ18-2LTA-E pinout, HZ18-2LTA-E application, or HZ18-2LTA-E equivalent, this device serves as a low-noise, low-leakage zener solution where thermal stability, tight voltage tolerance, and minimal noise contribution are critical selection criteria in instrumentation, sensor signal conditioning, and voltage reference design.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in a planar-diffused silicon junction. Its zener voltage exhibits a positive temperature coefficient near +0.06 %/°C (≈ +1.05 mV/°C) at ~18 V, minimizing drift in mid-voltage reference applications.
Designed for DC-biased operation only, it delivers low dynamic impedance (15.0 Ω) and reverse leakage ≤1 μA at VR = 15.0 V, enabling high-accuracy regulation without external compensation - unlike higher-voltage HZ-L variants with elevated rd or negative tempcos.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.5–18.3 V at IZ = 0.5 mA - defines stable regulation point with ±2.3% tolerance for precision biasing |
| Dynamic Resistance (rd) | 15.0 Ω at IZ = 0.5 mA - ensures minimal output voltage variation under load transients |
| Power Dissipation (Pd) | 400 mW - supports continuous operation up to 22.2 mA at 18 V without derating below 25°C |
| Reverse Leakage Current (IR) | ≤1 μA at VR = 15.0 V - prevents loading of high-impedance reference nodes |
| Junction Temperature (Tj) | 175°C maximum - enables reliable operation in compact PCB layouts with moderate thermal management |
| Package | DO-35 (GRZZ0002ZB-A) - axial leaded glass package with orange body and navy-blue cathode band, compatible with through-hole reflow or hand-soldering |
Pinout & Package
Package: DO-35 glass axial-leaded package (RENESAS code GRZZ0002ZB-A), 2.0 mm diameter × 26.0 mm length, 0.13 g mass, orange body with navy-blue cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | High-side terminal | Connected to regulated voltage node; polarity must be observed to maintain reverse-bias conduction |
| 2 (Anode) | Low-side terminal | Typically grounded or connected to lower potential; completes current path during zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| Noise performance | ≈1/3–1/10 lower than standard HZ-series diodes - reduces RMS noise in sensitive analog references |
| Temperature coefficient | +0.06 %/°C (≈+1.05 mV/°C) - enables predictable, low-drift behavior across −55°C to +125°C ambient |
| Leakage control | ≤1 μA at 15 V reverse bias - preserves accuracy in high-impedance divider networks |
| Voltage tolerance | ±2.3% over production lot - allows direct use without post-selection in cost-sensitive designs |
Applications
| Instrumentation Amplifier Reference | ADC Voltage Reference Buffer |
|---|---|
Use Scenario: Providing stable bias voltage to instrumentation amplifier input stages in portable data loggers. IC Role / Device Role / Timing Role: Low-noise zener reference source for common-mode voltage setting and offset calibration. Use Value: Enables <10 μVpp noise floor and <0.01%/°C drift in gain-stable front-end design without active regulation. |
Use Scenario: Supplying reference voltage to 16-bit SAR ADCs in industrial process monitoring systems. IC Role / Device Role / Timing Role: Passive voltage reference element stabilizing VREF node against supply ripple and thermal gradients. Use Value: Maintains ENOB ≥15.2 bits across −40°C to +85°C by limiting reference drift to <±1.5 mV. |
| Photodiode Bias Supply | Optocoupler Input Stabilization |
Use Scenario: Generating stable reverse bias for low-dark-current photodiodes in optical smoke detectors. IC Role / Device Role / Timing Role: Low-leakage zener regulating bias voltage to minimize dark current contribution. Use Value: Limits dark current increase to <0.5 pA/°C, preserving detection sensitivity over temperature. |
Use Scenario: Stabilizing LED forward current in linear optocoupler feedback loops for isolated DC-DC converters. IC Role / Device Role / Timing Role: Zener-clamped current source reference ensuring consistent CTR linearity. Use Value: Reduces CTR variation from ±8% to ±1.2% across 10–30 V input range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4744A | Zener voltage 15 V, rd = 14 Ω, Pd = 1 W, DO-41 package - higher power but wider VZ tolerance (±5%) and higher noise | Acceptable where 15 V suffices and board space allows larger DO-41 footprint | Select when higher power margin is needed and ±5% VZ tolerance is acceptable |
| BZX55C18 | Zener voltage 18 V, rd = 25 Ω, Pd = 500 mW, DO-35 - same package but higher dynamic impedance and no low-noise specification | Suitable for general-purpose regulation but not recommended for sub-μV noise-critical references | Choose for cost-sensitive non-precision uses where 25 Ω rd does not degrade loop stability |
Compared with 1N4744A and BZX55C18, HZ18-2LTA-E offers tighter voltage tolerance, verified low-noise performance, and lower dynamic resistance in the same DO-35 footprint - making it preferable for precision analog reference nodes where noise, drift, and regulation accuracy are prioritized over raw power handling.
Availability
HZ18-2LTA-E is available at Aetrix Electronics and suitable for instrumentation amplifiers, ADC reference buffers, photodiode bias supplies, and optocoupler stabilization circuits requiring stable component supply with traceable sourcing and long-term lifecycle support.
Supply support for HZ18-2LTA-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 Corporation is a Japanese semiconductor manufacturer specializing in microcontrollers, analog and power devices, and system-on-chip solutions for industrial, automotive, and infrastructure markets.
HZ18-2LTA-E belongs to the HZ-L Series of low-noise silicon planar Zener diodes, designed specifically for precision voltage reference and low-drift biasing applications in measurement and signal-conditioning systems.
FAQ
What is the zener voltage range of HZ18-2LTA-E?
HZ18-2LTA-E has a specified zener voltage range of 17.5 V to 18.3 V at a test current of 0.5 mA. This ±2.3% tolerance ensures predictable regulation behavior in precision analog circuits without requiring binning or trimming. The value is measured under DC conditions per Renesas specification REJ03G0182-0300 Rev.3.00.
Does HZ18-2LTA-E support AC or transient operation?
HZ18-2LTA-E is characterized and rated for DC operation only, as explicitly stated in the Renesas datasheet note "Tested with DC." It is not specified for AC impedance, frequency response, or surge current handling. For transient suppression or AC-coupled reference applications, additional external circuitry such as filtering or clamping must be used alongside HZ18-2LTA-E.
What is the maximum allowable reverse leakage current for HZ18-2LTA-E?
The maximum reverse leakage current for HZ18-2LTA-E is 1 μA at a reverse voltage of 15.0 V and ambient temperature of 25°C. This low leakage supports high-impedance reference networks and minimizes error in voltage divider-based biasing schemes. Exceeding 15 V reverse bias may increase leakage beyond specification limits.
Is HZ18-2LTA-E RoHS compliant?
Yes, HZ18-2LTA-E complies with the EU RoHS Directive, as confirmed by Renesas Electronics' environmental compliance documentation. The device contains no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE) above threshold limits. Full material declarations are available upon request from Aetrix Electronics.
What is the thermal resistance junction-to-ambient for HZ18-2LTA-E?
HZ18-2LTA-E does not specify a numerical junction-to-ambient thermal resistance (RθJA) in its datasheet. Instead, Renesas provides a derating curve (Fig.3) showing power dissipation vs. ambient temperature: full 400 mW is allowed up to 50°C, decreasing linearly to zero at 150°C. Layout-dependent PCB copper area and airflow determine actual thermal performance of HZ18-2LTA-E in practice.
HZ18-2LTA-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:
- -
HZ18-2LTA-E FAQ
1.How can I place an order for HZ18-2LTA-E through Aetrix?
Please submit a Request for Quotation (RFQ) for HZ18-2LTA-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 HZ18-2LTA-E reliable?
The price and inventory of HZ18-2LTA-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZ18-2LTA-E is usually 5 days.
3.What payment methods are accepted for HZ18-2LTA-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZ18-2LTA-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HZ18-2LTA-E?
HZ18-2LTA-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HZ18-2LTA-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 HZ18-2LTA-E?
For technical support, including HZ18-2LTA-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZ18-2LTA-E requirements.
6.How does Aetrix verify that HZ18-2LTA-E is sourced from the original manufacturer or authorized distributors?
All HZ18-2LTA-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 HZ18-2LTA-E meets industry standards.
7.What is the process for return or replacement of HZ18-2LTA-E?
All HZ18-2LTA-E units undergo pre-shipment inspection (PSI). If there is an issue with HZ18-2LTA-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 HZ18-2LTA-E part is unused and in its original packaging.
Return procedure for HZ18-2LTA-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
HZ18-2LTA-E 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
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
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…
