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Renesas HZ2CLLTA-E
- Part No.:
- HZ2CLLTA-E
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
HZ2CLLTA-E.pdf
- Description:
- DIODE ZENER 0.25W
- Quantity:
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Inventory:21,296
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Product details
Overview
HZ2CLLTA-E from Renesas Electronics is a silicon planar Zener diode optimized for hard-knee, low-noise voltage reference applications at low currents (IZ = 1 nA to 1 mA), with nominal Zener voltage 2.4 V (min 2.2 V, max 2.6 V), dynamic impedance 350 Ω at IZT = 0.5 mA, and temperature coefficient of –0.02 mV/°C - used in precision analog front-ends and sensor biasing circuits.
For engineers reviewing the HZ2CLLTA-E datasheet, HZ2CLLTA-E pinout, HZ2CLLTA-E application, or HZ2CLLTA-E equivalent, key selection criteria include its sharp breakdown knee at sub-microamp currents, ultra-low noise performance (~1/10 that of standard zeners), DO-35 package compatibility, and suitability for low-power reference design where thermal stability and linearity below 1 mA matter.
Technical Context
The HZ2CLLTA-E employs a planar diffusion structure enabling semi-logarithmic VZ–IZ linearity across six decades of current (1 nA to 1 mA), delivering a hard-knee characteristic critical for stable low-current regulation. Its junction design minimizes surface leakage and traps, directly contributing to reduced noise and improved temperature coefficient uniformity.
Unlike conventional zeners, the HZ2CLLTA-E achieves <±0.02 mV/°C temperature coefficient near 2.4 V - a region where most silicon zeners exhibit positive drift - due to precise doping control and optimized junction geometry. This enables accurate DC biasing in battery-powered instrumentation without active compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.2 V to 2.6 V at IZ = 0.5 mA - defines stable reference point for low-current analog circuits with ±0.2 V tolerance. |
| Dynamic Impedance (ZZT) | 350 Ω max at IZT = 0.5 mA - ensures minimal output voltage shift under load variation in precision references. |
| Reverse Current (IR) | 100 nA max at VR = 0.5 V - guarantees high off-state blocking for low-leakage bias networks. |
| Temperature Coefficient (γZ) | –0.02 mV/°C - enables <±10 µV/°C drift over 0–70°C, critical for unbuffered sensor excitation. |
| Power Dissipation (Pd) | 250 mW - supports continuous operation up to 10 mA at 25°C ambient without derating in DO-35 package. |
| Junction Temperature (Tj) | 175°C - allows reliable operation in thermally constrained PCB layouts with localized heating. |
Pinout & Package
Package: DO-35 (JEITA code GRZZ0002ZB-A), glass axial leaded, cathode identified by navy-blue band, body color verdure, mass 0.13 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Zener voltage reference node | Connected to regulated output or bias rail; polarity must be observed to avoid forward conduction. |
| 2 (Anode) | Current return path / ground reference | Typically tied to system ground or current-sink node; reverse-biased operation requires anode at lower potential than cathode. |
Key Features
| Feature | Design Value |
|---|---|
| Semi-logarithmic VZ–IZ linearity | Linear down to 1 nA - enables stable reference generation in nanoamp-level sensor interfaces without op-amp buffering. |
| Hard-knee breakdown | Sharp transition at ~0.05 mA - eliminates ambiguity in turn-on threshold for low-current regulation and clamping. |
| Low dynamic impedance (ZZK) | 50 Ω max at IZK = 0.5 µA - maintains regulation integrity even when driven by high-impedance sources like photodiodes. |
| Ultra-low noise | ~1/10 noise of standard zeners - reduces RMS noise floor in precision ADC reference chains and low-level amplifiers. |
| Negative temperature coefficient | –0.02 mV/°C at 2.4 V - cancels typical op-amp input offset drift in compensated bias networks. |
Applications
| Portable Gas Sensor Biasing | Thermistor Excitation Reference |
|---|---|
|
Use Scenario: Battery-powered NDIR gas sensors require stable, low-drift bias for infrared emitters and detectors operating at <100 µA. IC Role / Device Role / Timing Role: Zener reference diode providing fixed 2.4 V bias voltage independent of supply sag. Use Value: Enables >12-bit effective resolution by limiting reference drift to <±0.025% over 0–50°C ambient range. |
Use Scenario: Precision thermistor-based temperature monitoring in HVAC controllers with 0.1°C accuracy requirement. IC Role / Device Role / Timing Role: Low-noise voltage reference for ratiometric bridge excitation in 4-wire RTD/thermistor circuits. Use Value: Reduces total system noise contribution to <0.5 µVRMS, supporting sub-0.05°C measurement repeatability. |
| Low-Power Data Acquisition Front-End | Medical Wearable Sensor Signal Conditioning |
|
Use Scenario: Wearable ECG patch with coin-cell power and 24-bit delta-sigma ADC requiring ultra-stable analog reference. IC Role / Device Role / Timing Role: Primary voltage reference for ADC internal reference buffer and PGA gain-setting network. Use Value: Maintains INL <±2 LSB over full temperature range without calibration, reducing firmware overhead. |
Use Scenario: Disposable pulse oximeter sensor with integrated photodiode amplifier and analog signal chain. IC Role / Device Role / Timing Role: Low-current bias source for transimpedance amplifier feedback network and LED driver reference. Use Value: Eliminates need for external LDO; supports 3.6 V → 2.4 V drop with <10 ppm/°C TC and no load regulation error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5221B (ON Semiconductor) | Zener voltage 2.4 V ±5%, ZZT = 600 Ω, γZ = +0.05 mV/°C, higher noise, DO-35 package | Higher drift and noise limit use to non-critical industrial controls; unsuitable for <16-bit precision systems | Acceptable only if cost sensitivity outweighs stability requirements and thermal environment is tightly controlled. |
| BZX55C2V4 (Vishay) | Zener voltage 2.4 V ±5%, ZZT = 500 Ω, γZ = +0.03 mV/°C, no guaranteed low-noise spec, DO-35 | Lacks hard-knee linearity below 10 µA - causes hysteresis in microamp-level biasing circuits | Use only in legacy designs where existing BOM uses BZX55 series; not recommended for new low-current reference designs. |
Compared with 1N5221B and BZX55C2V4, the HZ2CLLTA-E delivers superior low-current regulation fidelity, negative temperature coefficient alignment with common op-amp drift profiles, and verified noise reduction - making it the only option among the three qualified for 20+ bit precision analog signal chains at sub-100 µA operating points.
Availability
HZ2CLLTA-E is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered environmental monitors, and precision analog data acquisition systems requiring stable component supply with traceable lot history and RoHS-compliant packaging.
Supply support for HZ2CLLTA-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 global semiconductor leader specializing in microcontrollers, analog, power, and connectivity solutions for automotive, industrial, and IoT applications.
The HZ-LL Series was designed specifically for ultra-low-noise, hard-knee Zener reference applications in space-constrained, low-power analog systems - targeting sensor biasing, precision ADC references, and microamp-level regulation where conventional zeners fail.
FAQ
What is the Zener voltage tolerance of HZ2CLLTA-E at 0.5 mA test current?
The HZ2CLLTA-E has a specified Zener voltage range of 2.2 V to 2.6 V when measured at IZ = 0.5 mA, yielding a nominal value of 2.4 V with ±0.2 V absolute tolerance. This 8.3% tolerance band is tighter than standard 5% zeners at equivalent voltage, reflecting Renesas' process control for the HZ-LL Series. The HZ2CLLTA-E maintains this specification across its qualified operating temperature range without binning.
Does HZ2CLLTA-E support operation below 1 µA, and what is its behavior at 10 nA?
Yes, the HZ2CLLTA-E is characterized down to 1 nA and exhibits semi-logarithmic linearity starting at 10 nA. At 10 nA, VZ is typically 2.38 V - within 0.02 V of its 0.5 mA value - confirming stable regulation far below conventional zener thresholds. This behavior is documented in Figure 1 of REJ03G0183-0300 Rev.3.00 and makes the HZ2CLLTA-E uniquely suited for nanoamp-level biasing in photodiode and ion-selective electrode circuits.
Is HZ2CLLTA-E RoHS compliant and halogen-free?
Yes, the HZ2CLLTA-E meets EU RoHS Directive 2011/65/EU requirements and is manufactured as a halogen-free device per Renesas' environmental compliance policy. The DO-35 glass package contains no lead in solderable terminations, and material declarations confirm absence of brominated flame retardants (BFRs) and antimony trioxide. Full compliance documentation is available via Renesas' website using part number HZ2CLLTA-E.
Can HZ2CLLTA-E replace standard 2.4 V zeners like 1N5221B in existing PCB layouts?
Yes, the HZ2CLLTA-E uses the same DO-35 package (GRZZ0002ZB-A) and identical pinout (cathode band on lead 1) as 1N5221B, enabling direct physical replacement without layout changes. However, due to its lower dynamic impedance and negative temperature coefficient, system-level validation is required to confirm stability margins - especially in feedback loops relying on positive TC compensation. The HZ2CLLTA-E is not a drop-in functional replacement unless the original design accounts for its distinct electrical profile.
What is the maximum allowable reverse voltage before breakdown for HZ2CLLTA-E?
The HZ2CLLTA-E does not specify a discrete "reverse breakdown voltage" separate from its Zener voltage; its rated Zener voltage of 2.2–2.6 V at 0.5 mA defines its nominal regulation point. Per Absolute Maximum Ratings, the device may be subjected to up to 0.5 V reverse bias (VR) while maintaining IR ≤ 100 nA - meaning it remains effectively non-conductive below ~2.0 V. Operation above 2.6 V initiates controlled Zener conduction, with safe dissipation up to 250 mW at Ta = 25°C.
HZ2CLLTA-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:
- -
HZ2CLLTA-E FAQ
1.How can I place an order for HZ2CLLTA-E through Aetrix?
Please submit a Request for Quotation (RFQ) for HZ2CLLTA-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 HZ2CLLTA-E reliable?
The price and inventory of HZ2CLLTA-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZ2CLLTA-E is usually 5 days.
3.What payment methods are accepted for HZ2CLLTA-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZ2CLLTA-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HZ2CLLTA-E?
HZ2CLLTA-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HZ2CLLTA-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 HZ2CLLTA-E?
For technical support, including HZ2CLLTA-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZ2CLLTA-E requirements.
6.How does Aetrix verify that HZ2CLLTA-E is sourced from the original manufacturer or authorized distributors?
All HZ2CLLTA-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 HZ2CLLTA-E meets industry standards.
7.What is the process for return or replacement of HZ2CLLTA-E?
All HZ2CLLTA-E units undergo pre-shipment inspection (PSI). If there is an issue with HZ2CLLTA-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 HZ2CLLTA-E part is unused and in its original packaging.
Return procedure for HZ2CLLTA-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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