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Renesas HZ3ALLTD-E
- Part No.:
- HZ3ALLTD-E
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
HZ3ALLTD-E.pdf
- Description:
- DIODE ZENER 0.25W
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Inventory:5,000
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Product details
Overview
HZ3ALLTD-E from Renesas Electronics is a silicon planar Zener diode optimized for hard-knee, low-noise voltage reference applications at low current (IZ = 0.5 mA), with a nominal Zener voltage of 2.7 V (min 2.5 V, max 2.9 V), dynamic impedance of 360 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 HZ3ALLTD-E datasheet, HZ3ALLTD-E pinout, HZ3ALLTD-E application, or HZ3ALLTD-E equivalent, this page delivers verified electrical specs, DO-35 package mapping, cathode/anode terminal roles, low-noise Zener behavior below 1 mA, and direct alternatives for voltage reference design continuity.
Technical Context
The HZ3ALLTD-E employs a planar diffusion structure to achieve sharp Zener breakdown knee characteristics between IZ = 1 nA and 1 mA, enabling stable reference generation without external current boosting. Its semi-logarithmic VZ–IZ curve minimizes voltage drift under microamp-level bias conditions.
Designed for low-power analog systems, it delivers <50 Ω dynamic impedance at IZK = 0.5 µA (knee region) and maintains linearity ∆VZ1 ≤ 0.5 V across IZ = 0.05 mA to 0.5 mA - critical for battery-powered instrumentation where supply current must remain sub-100 µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.5 V to 2.9 V at IZ = 0.5 mA - defines tight tolerance band for 2.7 V nominal reference in low-current bias networks. |
| Dynamic Impedance (ZZT) | 360 Ω max at IZT = 0.5 mA - ensures minimal output voltage shift under load transients in high-impedance feedback paths. |
| Knee Impedance (ZZK) | 50 Ω max at IZK = 0.5 µA - enables stable regulation down to nanoampere bias currents, supporting ultra-low-power sensor excitation. |
| Temperature Coefficient (γZ) | –0.02 mV/°C - contributes <±0.3 mV drift over –25°C to +85°C ambient, suitable for non-compensated industrial-grade references. |
| Power Dissipation (Pd) | 250 mW max - limits continuous operation to ≤100 µA at 2.7 V in free-air, enforcing thermal-aware PCB layout in dense analog sections. |
| Junction Temperature (Tj) | 175°C max - allows operation in high-ambient environments such as automotive engine control modules when derated per Fig.3. |
Pinout & Package
Package: DO-35 (JEITA code GRZZ0002ZB-A), glass axial leaded, 2.5 mm diameter × 3 mm body length, cathode identified by navy-blue band. Mass: 0.13 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output node; reverse-biased during Zener operation; requires current-limiting resistor to source. |
| 2 (Non-banded End) | Anode | Connected to circuit ground or lowest potential node; establishes reference return path and defines polarity of regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Hard-knee Zener characteristic | VZ–IZ curve exhibits sharp transition at IZ ≈ 1 µA, reducing uncertainty in low-current regulation points used in micropower comparators. |
| Low noise performance | Approximately 1/10 lower noise than standard Zeners in 10 Hz–10 kHz band - directly improves SNR in precision ADC reference buffers. |
| Semi-logarithmic linearity | ∆VZ1 ≤ 0.5 V and ∆VZ2 ≤ 0.6 V across three decades of current (1 nA–1 mA), enabling predictable scaling in programmable bias generators. |
| Negligible tempco at 2.7 V | γZ = –0.02 mV/°C near zero-crossing point - eliminates need for external compensation in cost-sensitive industrial sensors. |
Applications
| Portable Gas Sensor Biasing | Thermocouple Cold-Junction Compensation |
|---|---|
Use Scenario: Battery-powered NDIR gas sensor requiring stable 2.7 V bias for IR emitter LED and signal conditioning amplifier. IC Role / Device Role / Timing Role: Low-current Zener reference providing fixed bias voltage independent of battery discharge profile. Use Value: Enables >10-year operation on coin cell via sub-50 µA quiescent current while maintaining ±1.5 mV reference stability over –20°C to +60°C. |
Use Scenario: Analog front-end for Type-K thermocouple measurement in HVAC controllers, where cold-junction temperature sensing demands stable local reference. IC Role / Device Role / Timing Role: Precision voltage reference for RTD or thermistor bridge excitation and ADC reference scaling. Use Value: Delivers <±0.05% full-scale error contribution over operating temperature due to low γZ and tight VZ tolerance. |
| Medical Pulse Oximeter LED Driver | Industrial Current Loop Transmitter |
Use Scenario: Compact wearable pulse oximeter using red/IR LEDs driven by constant-current sources referenced to stable DC voltage. IC Role / Device Role / Timing Role: Low-noise Zener reference setting current mirror ratio in LED driver IC. Use Value: Reduces optical intensity drift to <0.2% over time, improving SpO₂ calculation accuracy without calibration rework. |
Use Scenario: 4–20 mA transmitter module converting 0–5 V sensor output, requiring rail-to-rail stable reference for DAC and current-sense amplifier. IC Role / Device Role / Timing Role: Primary voltage reference for 12-bit DAC and loop regulator feedback divider. Use Value: Maintains <±0.1% span error across 40°C ambient range, meeting HART-compliant field device accuracy requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5223B (ON Semiconductor) | Zener voltage 2.5 V ±5%, ZZT = 270 Ω at 20 mA - higher test current, higher dynamic impedance at µA-level bias. | Requires ≥1 mA bias for stable regulation; unsuitable for sub-100 µA systems. | Select only if system can support ≥1 mA reference current and tolerates wider VZ spread. |
| BZX55C2V7 (Vishay) | Zener voltage 2.7 V ±5%, ZZT = 350 Ω at 5 mA - similar VZ but specified at higher IZT, less defined knee behavior below 100 µA. | Lacks documented low-noise performance and hard-knee characterization below 10 µA. | Acceptable for general-purpose 2.7 V reference where µA-level stability and noise are not critical. |
Compared with HZ3ALLTD-E, the 1N5223B demands significantly higher bias current for regulation stability, while BZX55C2V7 lacks verified low-noise and sharp-knee behavior - making HZ3ALLTD-E uniquely suited for micropower analog reference designs requiring sub-100 µA operation and <1 µV/√Hz noise floor.
Availability
HZ3ALLTD-E is available at Aetrix Electronics and suitable for portable gas sensor biasing, thermocouple cold-junction compensation, and medical pulse oximeter LED driver applications requiring stable component supply, long-lifecycle support, and traceable sourcing for ISO 13485-aligned production.
Supply support for HZ3ALLTD-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 delivering microcontrollers, analog power, and connectivity solutions for automotive, industrial, and IoT applications - formed in 2010 through merger of NEC Electronics and Renesas Technology.
The HZ-LL Series was developed specifically for precision low-current voltage reference needs in battery-constrained instrumentation, emphasizing hard-knee breakdown, ultra-low noise, and stable temperature behavior below 1 mA - distinguishing it from general-purpose Zener families.
FAQ
What is the Zener voltage tolerance of HZ3ALLTD-E at 0.5 mA?
The HZ3ALLTD-E has a guaranteed Zener voltage range of 2.5 V to 2.9 V when tested at IZ = 0.5 mA, corresponding to a nominal 2.7 V with ±0.2 V absolute tolerance. This specification is measured under DC conditions per REJ03G0183-0300 Rev.3.00 and applies strictly to the HZ3ALLTD-E variant within the HZ-LL Series.
Does HZ3ALLTD-E support operation below 1 µA?
Yes, the HZ3ALLTD-E exhibits defined Zener behavior down to IZ = 1 nA, with documented linearity metrics ∆VZ1 and ∆VZ2 covering the 0.001 mA to 0.5 mA range. Its hard-knee characteristic ensures usable regulation even at 100 nA, though dynamic impedance rises above 5 kΩ below 1 µA - confirmed in Figure 1 of the official datasheet.
Is HZ3ALLTD-E RoHS compliant?
Yes, HZ3ALLTD-E complies with the EU RoHS Directive as confirmed by Renesas Electronics' environmental documentation. The device contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits, and its DO-35 glass package meets material declaration requirements per Renesas' published compliance statements.
What is the maximum allowable ambient temperature for continuous operation of HZ3ALLTD-E?
The HZ3ALLTD-E supports continuous operation up to +125°C ambient temperature when mounted on a standard FR-4 PCB (100 × 180 × 1.6 mm, paper phenol), based on the derating curve in Figure 3 of REJ03G0183-0300. At 125°C, its power dissipation must be limited to ≤120 mW to maintain junction temperature ≤175°C.
Can HZ3ALLTD-E replace standard Zeners like 1N4728A in existing designs?
No - HZ3ALLTD-E is not a drop-in replacement for 1N4728A (3.3 V, 1 W). It operates at much lower current (0.5 mA vs. 76 mA), has different Zener voltage (2.7 V vs. 3.3 V), and uses DO-35 instead of DO-41. Direct substitution would cause regulation failure; redesign of bias network and layout is required to leverage HZ3ALLTD-E's low-power advantages.
HZ3ALLTD-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:
- -
HZ3ALLTD-E FAQ
1.How can I place an order for HZ3ALLTD-E through Aetrix?
Please submit a Request for Quotation (RFQ) for HZ3ALLTD-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 HZ3ALLTD-E reliable?
The price and inventory of HZ3ALLTD-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZ3ALLTD-E is usually 5 days.
3.What payment methods are accepted for HZ3ALLTD-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZ3ALLTD-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HZ3ALLTD-E?
HZ3ALLTD-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HZ3ALLTD-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 HZ3ALLTD-E?
For technical support, including HZ3ALLTD-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZ3ALLTD-E requirements.
6.How does Aetrix verify that HZ3ALLTD-E is sourced from the original manufacturer or authorized distributors?
All HZ3ALLTD-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 HZ3ALLTD-E meets industry standards.
7.What is the process for return or replacement of HZ3ALLTD-E?
All HZ3ALLTD-E units undergo pre-shipment inspection (PSI). If there is an issue with HZ3ALLTD-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 HZ3ALLTD-E part is unused and in its original packaging.
Return procedure for HZ3ALLTD-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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