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Renesas RD30F-T8-AZ
- Part No.:
- RD30F-T8-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD30F-T8-AZ.pdf
- Description:
- DIODE ZENER
- Quantity:
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- Shipping:
Inventory:9,990
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Product details
Overview
RD30F-T8-AZ from Renesas Electronics is a 1 W planar-type silicon Zener diode with a nominal zener voltage of 30 V (B3 grade: 29.57–31.26 V), dynamic impedance of 18 Ω at 10 mA, and temperature coefficient of +23 mV/°C. It features DO-41 glass-sealed DHD (Double Heatsink Diode) packaging, operates up to 175°C junction temperature, and is rated for 400 W surge reverse power at 10 μs - used in precision voltage regulation and transient suppression circuits in industrial power supplies.
For engineers reviewing the RD30F-T8-AZ datasheet, RD30F-T8-AZ pinout, RD30F-T8-AZ application, or RD30F-T8-AZ equivalent, this page delivers verified electrical specs, thermal behavior, JEDEC DO-41 terminal mapping, real-world use cases in clamping and reference circuits, and two validated alternative Zener diodes with documented voltage tolerance and impedance differences.
Technical Context
This device implements a planar-junction Zener structure optimized for stable breakdown in the 30 V range, with low dynamic impedance (18 Ω @ 10 mA) enabling tight regulation under varying load conditions. Its positive temperature coefficient (+23 mV/°C) supports thermal stability in series-connected reference designs.
The DO-41 package provides dual heatsink capability via axial leads and glass passivation, supporting 1 W continuous dissipation at 25°C ambient and derated performance up to 175°C junction temperature. Surge handling is defined per Figure 7: 400 W at t = 10 μs, non-repetitive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 29.57–31.26 V (B3 grade, tested at 40 ms after power-on; defines regulation window for feedback or clamp circuits) |
| Power Dissipation (P) | 1.0 W at TA = 25°C (derates linearly above 25°C per Fig.1; sets max continuous DC/average power in regulator design) |
| Dynamic Impedance (ZZ) | 18 Ω @ IZ = 10 mA (low AC impedance ensures minimal output voltage variation under dynamic load transients) |
| Reverse Current (IR) | ≤10 μA @ VR = 23 V (specifies leakage threshold before breakdown; critical for low-power standby circuits) |
| Junction Temperature (Tj) | −65 to +175°C (enables operation in harsh environments such as industrial motor drives or automotive under-hood modules) |
| Surge Reverse Power (PRSM) | 400 W @ t = 10 μs (defines single-pulse transient absorption capability for ESD or inductive kick protection) |
| Temperature Coefficient (γZ) | +23 mV/°C (positive drift enables predictable bias shift in temperature-compensated references) |
Pinout & Package
RD30F-T8-AZ uses the JEDEC DO-41 axial glass package (3.0 mm diameter × 5.0 mm length), with cathode indicated by a black band. The DHD structure provides enhanced thermal conduction through both leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection in reverse-biased Zener mode | Connected to circuit ground or lower potential node when used as shunt regulator or clamp |
| Cathode | Zener breakdown terminal / high-side connection in reverse-biased mode | Connected to input rail or signal line needing voltage limiting; black band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| Wide zener voltage range (2–82 V) | Enables standardized BOM across multiple voltage rails without redesigning layout or thermal management |
| E24 series nominal values | Ensures compatibility with standard resistor ladder networks and common feedback divider ratios |
| DO-41 glass-sealed DHD structure | Provides dual thermal paths and mechanical robustness for high-reliability industrial mounting |
| B3-grade voltage tolerance | Offers tighter 3.4% tolerance (29.57–31.26 V) vs. full B grade (27.43–31.26 V), improving reference accuracy |
| Positive temperature coefficient | Allows series combination with negative-coefficient devices (e.g., forward-biased diodes) for zero-drift references |
Applications
| Industrial Power Supply Regulation | ESD Protection Clamp |
|---|---|
Use Scenario: Stabilizing 30 V auxiliary rail in programmable logic controller (PLC) power module. IC Role / Device Role / Timing Role: Shunt voltage reference and overvoltage clamp for LDO input stage. Use Value: Maintains ±1.2 V regulation window under 10–100 mA load steps due to 18 Ω ZZ, preventing brownout resets. |
Use Scenario: Protecting RS-485 transceiver I/O pins against ±8 kV contact ESD per IEC 61000-4-2. IC Role / Device Role / Timing Role: Low-capacitance transient voltage suppressor placed directly at connector interface. Use Value: Clamps 400 W surges within 10 μs without degradation, preserving signal integrity below 10 pF parasitic capacitance. |
| Automotive Body Control Module Reference | Test Equipment Precision Bias Source |
Use Scenario: Generating stable 30 V bias for op-amp comparators monitoring battery voltage thresholds. IC Role / Device Role / Timing Role: Temperature-compensated reference element in analog front-end circuitry. Use Value: +23 mV/°C γZ enables predictable offset correction across −40°C to +125°C operating range. |
Use Scenario: Calibrating 30 V range on bench multimeter input attenuator network. IC Role / Device Role / Timing Role: Primary voltage standard in metrology-grade divider chain. Use Value: B3-grade tolerance (±0.85 V) and <10 μA leakage at 23 V support sub-0.1% measurement uncertainty. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5256BRLG (ON Semiconductor) | 30 V nominal, ±5% tolerance (28.5–31.5 V), ZZ = 35 Ω @ 10 mA, DO-35 package | Higher impedance and looser tolerance reduce regulation accuracy in precision feedback loops | Select when cost sensitivity outweighs regulation tightness; verify PCB pad compatibility with smaller DO-35 footprint |
| BZX84-C30LT1G (onsemi) | 30 V nominal, ±5% tolerance, ZZ = 40 Ω @ 5 mA, SOT-23 surface-mount package | SMT form factor eliminates axial lead stress but lacks DO-41's 400 W surge rating and thermal mass | Prefer for space-constrained PCBs where transient energy is limited to <50 W; not suitable for high-energy clamp roles |
Compared with RD30F-T8-AZ, the 1N5256BRLG offers lower cost but sacrifices 17 Ω in dynamic impedance and 1.7% in voltage tolerance, while the BZX84-C30LT1G trades axial ruggedness and surge capacity for board-area savings - making RD30F-T8-AZ optimal for industrial clamping and reference duties demanding both precision and robustness.
Availability
RD30F-T8-AZ is available at Aetrix Electronics and suitable for industrial power supply regulation, ESD protection clamp circuits, automotive body control module references, and test equipment precision bias sources requiring stable component supply across extended lifecycle programs.
Supply support for RD30F-T8-AZ 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 SoC solutions for industrial, automotive, and infrastructure markets.
RD30F-T8-AZ belongs to the RD2.0F–RD82F planar Zener diode family, engineered for standardized 1 W voltage regulation and transient suppression in cost-sensitive, high-volume industrial systems.
FAQ
What is the exact zener voltage range for RD30F-T8-AZ?
The RD30F-T8-AZ is specified as B3 grade, with a zener voltage range of 29.57 V to 31.26 V at 10 mA test current (IZ), per Renesas datasheet D13936EJ5V0DS. This 3.4% tolerance reflects tighter binning than the broader B grade (27.43–31.26 V), and the value is measured 40 ms after power-on to ensure thermal stabilization. RD30F-T8-AZ maintains this specification across its qualified operating temperature range.
Does RD30F-T8-AZ have a positive or negative temperature coefficient?
RD30F-T8-AZ has a positive zener voltage temperature coefficient of +23 mV/°C, as confirmed in the Electrical Characteristics table on page 4 of the official Renesas datasheet. This characteristic is typical for Zener diodes above ~5 V and enables predictable voltage drift with temperature - useful for compensating other components in reference designs. RD30F-T8-AZ's coefficient remains stable across its rated junction temperature range.
What is the maximum surge reverse power rating for RD30F-T8-AZ?
RD30F-T8-AZ is rated for 400 W surge reverse power (PRSM) at a pulse width of 10 μs under non-repetitive conditions, per Figure 7 in the Renesas datasheet. This rating defines its single-event transient absorption capability - critical for protecting downstream circuitry from inductive spikes or ESD events. RD30F-T8-AZ must be operated within this limit to avoid permanent degradation.
Is RD30F-T8-AZ compatible with DO-41 footprint layouts?
Yes, RD30F-T8-AZ uses the standard JEDEC DO-41 axial package (3.0 mm diameter, 5.0 mm body length, 25 mm minimum lead length), fully compatible with industry-standard DO-41 footprints and wave-solder tooling. The cathode is marked with a black band, matching conventional DO-41 polarity identification. RD30F-T8-AZ requires no layout changes when replacing other DO-41 Zeners with identical lead spacing.
What quality grade applies to RD30F-T8-AZ according to Renesas documentation?
RD30F-T8-AZ is classified as "Standard" quality grade per Renesas' product grading policy (Notice #7 in the datasheet), meaning it is qualified for applications including industrial robots, machine tools, office equipment, and communications gear - but not for safety-critical or life-support systems. This grade applies unless explicitly stated otherwise in Renesas data sheets, and RD30F-T8-AZ carries no "High Quality" or "Specific" designation.
RD30F-T8-AZ 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:
- -
RD30F-T8-AZ FAQ
1.How can I place an order for RD30F-T8-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD30F-T8-AZ 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 RD30F-T8-AZ reliable?
The price and inventory of RD30F-T8-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD30F-T8-AZ is usually 5 days.
3.What payment methods are accepted for RD30F-T8-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD30F-T8-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD30F-T8-AZ?
RD30F-T8-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD30F-T8-AZ 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 RD30F-T8-AZ?
For technical support, including RD30F-T8-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD30F-T8-AZ requirements.
6.How does Aetrix verify that RD30F-T8-AZ is sourced from the original manufacturer or authorized distributors?
All RD30F-T8-AZ 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 RD30F-T8-AZ meets industry standards.
7.What is the process for return or replacement of RD30F-T8-AZ?
All RD30F-T8-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD30F-T8-AZ, 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 RD30F-T8-AZ part is unused and in its original packaging.
Return procedure for RD30F-T8-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD30F-T8-AZ Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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SMAZ12-13-F
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