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Renesas HZ27-2LTD-E
- Part No.:
- HZ27-2LTD-E
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
HZ27-2LTD-E.pdf
- Description:
- DIODE ZENER 27V 400MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:40,439
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Product details
Overview
HZ27-2LTD-E from Renesas Electronics is a silicon planar Zener diode optimized for low-noise voltage reference and stabilization in precision analog circuits, featuring a nominal zener voltage of 26.2–27.6 V at 0.5 mA test current, 24.0 Ω dynamic impedance, 400 mW power dissipation, and DO-35 glass package with navy-blue cathode band. It is used in high-stability power supply feedback paths, sensor excitation references, and instrumentation front-end biasing where low noise and tight voltage tolerance are critical.
For engineers reviewing the HZ27-2LTD-E datasheet, HZ27-2LTD-E pinout, HZ27-2LTD-E application, or HZ27-2LTD-E equivalent, key selection criteria include zener voltage tolerance (±0.7 V), temperature coefficient (−0.04 %/°C at ~27 V), low leakage (<1 μA at VR = 20.9 V), and compatibility with standard through-hole PCB assembly processes for industrial and test equipment designs.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in a planar-diffused silicon junction. Its low-noise performance stems from optimized doping profile and passivation, achieving diode noise ~1/3–1/10 that of legacy HZ-series parts. The DO-35 package ensures thermal stability up to 175°C junction temperature.
Electrical behavior is specified under DC conditions at Ta = 25°C, with zener voltage measured at IZ = 0.5 mA and dynamic resistance derived at IZ = 1 mA. Temperature coefficient curves show monotonic negative drift across the 27 V range, enabling predictable compensation in reference designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 26.2–27.6 V at IZ = 0.5 mA - defines stable regulation point for feedback networks requiring ±0.7 V tolerance |
| Dynamic Resistance (rd) | 24.0 Ω at IZ = 1 mA - determines output impedance and load regulation sensitivity in shunt reference configurations |
| Power Dissipation (Pd) | 400 mW - sets maximum continuous power handling without derating below 25°C ambient |
| Reverse Leakage (IR) | <1 μA at VR = 20.9 V - minimizes error current in high-impedance reference nodes |
| Junction Temperature (Tj) | 175°C - enables operation in thermally demanding environments such as industrial control enclosures |
| Temperature Coefficient (γZ) | −0.04 %/°C - allows accurate prediction of voltage drift over −55°C to +125°C operating range |
Pinout & Package
The HZ27-2LTD-E is housed in a DO-35 glass axial package (Renesas code GRZZ0002ZB-A, JEITA SC-40), with orange body color and navy-blue cathode band marking. Total mass is 0.13 g; lead spacing is 2.0 mm nominal, overall length 26.0 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | High-side reference node | Connected to regulated output or error amplifier inverter input; polarity must be observed to avoid reverse conduction |
| 2 (Anode) | Low-side return path | Tied to ground or common reference plane; forms shunt path for excess current during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise Zener structure | Diode noise reduced to ~1/3–1/10 of standard HZ series - improves SNR in precision ADC references and low-level signal conditioning |
| Stable zener impedance | 24.0 Ω typical at 1 mA - ensures consistent regulation under varying load currents in feedback loops |
| Wide zener voltage range | 26.2–27.6 V tolerance window - supports design margining for aging and temperature drift in long-life systems |
| High reliability packaging | DO-35 glass envelope with hermetic seal - maintains parameter stability over 10+ years in industrial storage and operation |
| Low leakage specification | <1 μA at 20.9 V reverse bias - prevents reference node loading in µA-scale bias networks |
Applications
| Industrial Power Supply Reference | Precision Sensor Excitation |
|---|---|
|
Use Scenario: Feedback voltage reference in isolated 24 V DC-DC converter for PLC I/O modules. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 27 V setpoint to optocoupler-based error amplifier. Use Value: Enables ±0.5% output regulation over line/load/temperature with minimal drift due to −0.04 %/°C γZ. |
Use Scenario: Excitation source for 350 Ω strain gauge bridge in weigh scale transducer. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source driving bridge top rail with <1 μA leakage. Use Value: Reduces measurement noise floor by >10 dB compared to standard Zener alternatives, improving resolution to 0.01% FS. |
| Test Equipment Bias Generator | Analog Front-End Calibration Reference |
|
Use Scenario: Programmable bias voltage generator in automated test fixture for op-amp DC parameter validation. IC Role / Device Role / Timing Role: Precision shunt reference in DAC-output buffer circuit, trimmed to 27.0 V ±0.1 V. Use Value: Maintains calibration accuracy over 8-hour test cycles with <0.05% drift, enabled by 400 mW Pd headroom. |
Use Scenario: On-board reference for 16-bit SAR ADC in medical diagnostic signal chain. IC Role / Device Role / Timing Role: Primary voltage reference for ADC internal VREF input, decoupled via RC filter. Use Value: Delivers <100 nV/√Hz noise density and −0.04 %/°C TC, meeting EN 60601-1 stability requirements for Class II devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5260BLT1G | Zener voltage 27 V ±5%, rd = 35 Ω, SOD-123 surface-mount package | Requires PCB rework for SMT layout; higher impedance increases load regulation error | Select when board space is constrained and thermal budget permits lower Pd (200 mW) |
| Vishay BZX79-C27 | Zener voltage 27 V ±5%, rd = 30 Ω, DO-35 package, noise not characterized | Lacks low-noise optimization; unsuitable for sub-μV noise-critical sensor references | Acceptable for general-purpose stabilization where noise <10× higher is tolerable |
Compared with MMBZ5260BLT1G and BZX79-C27, the HZ27-2LTD-E provides superior noise performance and tighter voltage tolerance in the same DO-35 footprint, making it preferred for metrology-grade references despite higher cost.
Availability
HZ27-2LTD-E is available at Aetrix Electronics and suitable for industrial power supplies, precision sensor interfaces, test equipment biasing, and analog front-end calibration requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for HZ27-2LTD-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-L Series was designed specifically for low-noise, high-stability voltage reference applications in test and measurement, industrial automation, and precision analog signal chains where legacy Zener noise limits system resolution.
FAQ
What is the zener voltage tolerance of HZ27-2LTD-E at 0.5 mA?
The HZ27-2LTD-E has a zener voltage range of 26.2 V to 27.6 V when tested at IZ = 0.5 mA, corresponding to a ±0.7 V absolute tolerance. This specification is guaranteed per Renesas REJ03G0182-0300 Rev.3.00 and applies to all units within the DO-35 package variant labeled HZ27-2LTD-E.
Does HZ27-2LTD-E meet RoHS requirements?
Yes, HZ27-2LTD-E complies with EU RoHS Directive 2011/65/EU as confirmed by Renesas Electronics' environmental compliance documentation. The DO-35 glass package contains no lead in solderable terminations, and all materials are certified lead-free with homogeneous lead content <1000 ppm.
What is the maximum junction temperature rating for HZ27-2LTD-E?
The HZ27-2LTD-E is rated for a maximum junction temperature (Tj) of 175°C, as specified in the Absolute Maximum Ratings table of the official Renesas datasheet REJ03G0182-0300. Derating begins above 25°C ambient per the published power dissipation vs. temperature curve.
How does the noise performance of HZ27-2LTD-E compare to standard Zener diodes?
HZ27-2LTD-E achieves approximately 1/3 to 1/10 the diode noise level of conventional HZ-series Zeners due to proprietary planar diffusion and passivation. This is explicitly documented in the Features section of the Renesas datasheet and verified in low-frequency (<10 kHz) spectral measurements for precision reference use.
Is HZ27-2LTD-E suitable for automotive applications?
No - HZ27-2LTD-E is classified as a "Standard" quality grade device per Renesas' product grading system and is intended for computers, office equipment, test instruments, and industrial robots. It is not qualified for automotive use (AEC-Q101) or safety-critical systems; Renesas explicitly restricts its use in transportation equipment without prior written consent.
HZ27-2LTD-E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 27 V
- Tolerance:
- ±2.59%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 150 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 24 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
HZ27-2LTD-E FAQ
1.How can I place an order for HZ27-2LTD-E through Aetrix?
Please submit a Request for Quotation (RFQ) for HZ27-2LTD-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 HZ27-2LTD-E reliable?
The price and inventory of HZ27-2LTD-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZ27-2LTD-E is usually 5 days.
3.What payment methods are accepted for HZ27-2LTD-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZ27-2LTD-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HZ27-2LTD-E?
HZ27-2LTD-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HZ27-2LTD-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 HZ27-2LTD-E?
For technical support, including HZ27-2LTD-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZ27-2LTD-E requirements.
6.How does Aetrix verify that HZ27-2LTD-E is sourced from the original manufacturer or authorized distributors?
All HZ27-2LTD-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 HZ27-2LTD-E meets industry standards.
7.What is the process for return or replacement of HZ27-2LTD-E?
All HZ27-2LTD-E units undergo pre-shipment inspection (PSI). If there is an issue with HZ27-2LTD-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 HZ27-2LTD-E part is unused and in its original packaging.
Return procedure for HZ27-2LTD-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
HZ27-2LTD-E Tags
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