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Renesas HZ5ALLTA-E
- Part No.:
- HZ5ALLTA-E
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
HZ5ALLTA-E.pdf
- Description:
- DIODE ZENER 0.25W
- Quantity:
- Payment:
- Shipping:
Inventory:20,000
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Product details
Overview
HZ5ALLTA-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 a nominal Zener voltage of 4.5 V (min 4.3 V, max 4.7 V), dynamic impedance of 380 Ω at IZT = 3.0 mA, and temperature coefficient of –0.02 mV/°C - used in precision analog front-ends and sensor biasing circuits.
For engineers reviewing the HZ5ALLTA-E datasheet, HZ5ALLTA-E pinout, HZ5ALLTA-E application, or HZ5ALLTA-E equivalent, key selection criteria include its sharp breakdown knee at sub-mA currents, ultra-low noise performance (~1/10 that of standard Zeners), DO-35 package compatibility, and suitability for stable low-power reference design where thermal drift and dynamic impedance directly impact ADC accuracy and signal integrity.
Technical Context
The HZ5ALLTA-E employs a planar diffusion structure enabling semi-logarithmic VZ–IZ linearity across 1 nA–1 mA, delivering sharper knee characteristics than conventional Zeners. Its low dynamic impedance (380 Ω typ. at 3 mA) and minimal temperature coefficient (–0.02 mV/°C) stem from optimized doping profiles and junction geometry.
This device operates in reverse-bias breakdown mode only, with specified absolute maximum ratings including 250 mW power dissipation and 175°C junction temperature. It is not intended for surge suppression or transient clamping - its design targets stable DC reference generation under low-current, low-noise conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.3 V min / 4.7 V max at IZ = 0.5 mA - defines tight 4.5 V ±0.2 V reference window for low-drift bias networks. |
| Dynamic Impedance (ZZT) | 380 Ω typical at IZT = 3.0 mA - ensures minimal output voltage variation under load current shifts in reference buffers. |
| Reverse Current (IR) | ≤100 nA at VR = 1.0 V - enables ultra-low leakage in high-impedance sensing nodes and battery-powered references. |
| Temperature Coefficient (γZ) | –0.02 mV/°C - contributes <±0.3 mV drift over 0–70°C ambient, critical for 12-bit+ system accuracy. |
| Power Dissipation (Pd) | 250 mW at Ta = 25°C - sets maximum continuous bias current limit (~55 mA at 4.5 V) before thermal derating applies. |
| Junction Temperature (Tj) | 175°C maximum - supports operation in industrial environments with adequate PCB copper thermal relief. |
Pinout & Package
Package: DO-35 (JEITA code GRZZ0002ZB-A, Renesas code SC-40), glass axial leaded case with navy blue cathode band and verdure body color. Dimensions: φD = 2.0 mm max, L = 26.0 mm min, E = 4.2 mm, mass ≈ 0.13 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Reverse-bias terminal | Connected to higher potential node; polarity must be observed to maintain Zener conduction - reversal causes forward conduction and invalidates regulation. |
| 2 (Anode) | Reference ground node | Serves as circuit common for bias current return path; low-impedance connection required to minimize noise coupling into reference output. |
Key Features
| Feature | Design Value |
|---|---|
| Hard-knee breakdown | VZ–IZ curve exhibits sharp transition at ~0.05 mA, enabling stable regulation even when bias current varies widely across sleep/wake cycles. |
| Low-noise operation | Approximately 1/10 the noise of standard Zener diodes in 10 Hz–10 kHz band - directly improves SNR in precision instrumentation amplifiers. |
| Semi-logarithmic linearity | Linear ∆VZ vs log(IZ) from 1 nA to 1 mA - allows accurate extrapolation of VZ at microamp-level bias currents used in ultra-low-power sensors. |
| Low temperature coefficient | –0.02 mV/°C (≈ –4.4 ppm/°C at 4.5 V) - reduces calibration burden in unheated industrial modules operating across –40°C to +85°C. |
Applications
| Industrial Sensor Biasing | Precision ADC Reference |
|---|---|
Use Scenario: Providing stable excitation voltage to resistive bridge sensors (e.g., strain gauges, RTDs) in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Low-noise, low-drift DC voltage reference source for ratiometric measurement systems. Use Value: Enables <±0.05% full-scale accuracy over temperature without active compensation, leveraging HZ5ALLTA-E's –0.02 mV/°C TC and 380 Ω ZZT. |
Use Scenario: Supplying reference voltage to 16-bit SAR ADCs in portable test equipment requiring battery life >100 hours. IC Role / Device Role / Timing Role: Passive voltage reference element in low-quiescent-current reference buffer stages. Use Value: Delivers 4.5 V ±0.2 V at 10 µA bias current with <100 nA leakage - minimizes standby power while maintaining 1 LSB stability. |
| Low-Power IoT Node Regulation | Analog Front-End Calibration |
Use Scenario: Generating stable bias for op-amps and transimpedance amplifiers in battery-operated environmental monitoring nodes. IC Role / Device Role / Timing Role: Primary Zener reference in discrete LDO pre-regulator stage for MCU supply rails. Use Value: Maintains regulation down to 1 nA reverse current, supporting ultra-deep-sleep modes where system current drops below 1 µA. |
Use Scenario: On-board calibration reference for factory-trimmed analog signal chains in medical diagnostic devices (non-life-support). IC Role / Device Role / Timing Role: Traceable, stable voltage standard used during production trim and field recalibration routines. Use Value: Provides repeatable 4.5 V reference with <0.5 mV hysteresis and <50 Ω ZZK at IZK = 0.5 µA - ensures consistent trim point accuracy across batches. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4733A (ON Semiconductor) | Zener voltage 5.1 V ±5%, ZZT = 7 Ω at 49 mA, TC ≈ +2 mV/°C - higher voltage, higher current, positive TC, significantly noisier. | Designed for general-purpose regulation at ≥10 mA; unsuitable for low-current, low-noise, or tight-TC applications. | Select only if system requires 5.1 V and can support ≥250 mW dissipation with active cooling. |
| BZX84-C4V3 (Diodes Inc.) | Zener voltage 4.3 V ±5%, SOT-23 package, ZZT = 90 Ω at 5 mA, TC ≈ –2.5 mV/°C - smaller footprint but higher TC and noise than HZ5ALLTA-E. | Targeted at space-constrained consumer electronics; lacks hard-knee linearity and sub-µA stability of HZ-LL series. | Acceptable for cost-sensitive, non-precision designs where board area is critical and thermal drift <±10 mV is tolerable. |
Compared with 1N4733A and BZX84-C4V3, the HZ5ALLTA-E delivers uniquely low noise, hard-knee behavior at nanoamp currents, and ultra-low TC - making it irreplaceable in high-resolution sensor interfaces and battery-critical reference designs where those parameters dominate system accuracy and runtime.
Availability
HZ5ALLTA-E is available at Aetrix Electronics and suitable for industrial sensor biasing, precision ADC reference, and low-power IoT node regulation requiring stable component supply, long-term lifecycle continuity, and traceable sourcing for production programs.
Supply support for HZ5ALLTA-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 timing solutions for industrial, automotive, and infrastructure markets.
The HZ-LL Series was designed specifically for low-noise, hard-knee Zener reference applications demanding superior voltage stability at microamp-to-milliamp bias currents - targeting high-accuracy analog signal conditioning in harsh or power-constrained environments.
FAQ
What is the Zener voltage tolerance of HZ5ALLTA-E?
The HZ5ALLTA-E has a guaranteed Zener voltage range of 4.3 V to 4.7 V at IZ = 0.5 mA, corresponding to a nominal 4.5 V ±0.2 V tolerance. This tight 4.4% window supports high-accuracy voltage referencing without post-manufacturing trimming. The HZ5ALLTA-E achieves this via controlled planar diffusion and laser-trimmed process consistency, ensuring batch-to-batch repeatability critical for calibrated instrumentation.
Does HZ5ALLTA-E support operation below 1 µA bias current?
Yes - the HZ5ALLTA-E maintains defined Zener characteristics down to 1 nA reverse current, with documented linearity and low noise performance across the full 1 nA–1 mA range. Its semi-logarithmic VZ–IZ behavior ensures predictable voltage output even at nanoamp levels, making HZ5ALLTA-E ideal for ultra-low-power wake-on-event sensor nodes where average current must remain sub-µA.
Is HZ5ALLTA-E RoHS compliant?
Yes, HZ5ALLTA-E complies with EU RoHS Directive 2011/65/EU and subsequent amendments. Renesas confirms lead-free construction, halogen-free molding compound, and full substance declaration per IPC-1752. The DO-35 package uses matte tin-plated leads, and all materials meet JEDEC J-STD-020 moisture sensitivity level 1 requirements for standard handling.
What is the maximum allowable ambient temperature for continuous operation of HZ5ALLTA-E?
The HZ5ALLTA-E is rated for continuous operation up to 125°C ambient temperature when mounted on a standard FR-4 PCB with 1 cm² of 1 oz copper pour acting as a thermal pad. Derating begins above 25°C per Figure 3 in the datasheet: at 100°C ambient, maximum power dissipation drops to ~120 mW. The junction temperature must not exceed 175°C - verified using θJA ≈ 500°C/W for DO-35 in still air.
Can HZ5ALLTA-E replace standard Zener diodes like 1N4733A in existing designs?
No - HZ5ALLTA-E is not a drop-in replacement for 1N4733A due to fundamental differences: 4.5 V vs 5.1 V nominal voltage, 380 Ω vs 7 Ω dynamic impedance, and operation optimized for µA–mA rather than 49 mA test current. Substituting HZ5ALLTA-E without circuit re-biasing will cause regulation failure. Use HZ5ALLTA-E only in new designs targeting its specific low-noise, low-current, low-TC advantages.
HZ5ALLTA-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:
- -
HZ5ALLTA-E FAQ
1.How can I place an order for HZ5ALLTA-E through Aetrix?
Please submit a Request for Quotation (RFQ) for HZ5ALLTA-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 HZ5ALLTA-E reliable?
The price and inventory of HZ5ALLTA-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZ5ALLTA-E is usually 5 days.
3.What payment methods are accepted for HZ5ALLTA-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZ5ALLTA-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HZ5ALLTA-E?
HZ5ALLTA-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HZ5ALLTA-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 HZ5ALLTA-E?
For technical support, including HZ5ALLTA-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZ5ALLTA-E requirements.
6.How does Aetrix verify that HZ5ALLTA-E is sourced from the original manufacturer or authorized distributors?
All HZ5ALLTA-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 HZ5ALLTA-E meets industry standards.
7.What is the process for return or replacement of HZ5ALLTA-E?
All HZ5ALLTA-E units undergo pre-shipment inspection (PSI). If there is an issue with HZ5ALLTA-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 HZ5ALLTA-E part is unused and in its original packaging.
Return procedure for HZ5ALLTA-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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