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Renesas RD30F-T7-AZ
- Part No.:
- RD30F-T7-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD30F-T7-AZ.pdf
- Description:
- DIODE ZENER
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Product details
Overview
RD30F-T7-AZ from Renesas Electronics is a 1 W planar-type silicon zener diode in DO-41 glass-sealed DHD package, with nominal zener voltage 30 V (B3 grade: 29.57–31.26 V), dynamic impedance ≤18 Ω at 10 mA, and zener voltage temperature coefficient +23 mV/°C. It serves as a precision voltage reference and overvoltage clamp in power supply regulation circuits.
For engineers reviewing the RD30F-T7-AZ datasheet, RD30F-T7-AZ pinout, RD30F-T7-AZ application, or RD30F-T7-AZ equivalent, this page delivers verified electrical specs, thermal behavior, JEDEC DO-41 terminal mapping, and direct alternative options for voltage reference and surge suppression design.
Technical Context
This device operates in reverse-bias breakdown mode with tightly controlled zener voltage tolerance (±2.8% for B3 grade), enabling stable DC reference generation across industrial ambient temperatures (−65°C to +175°C). Its planar DHD structure provides low thermal resistance (Rth ≈ 150°C/W at 5 mm2 copper pad) and high surge capability (400 W, t = 10 μs).
The RD30F-T7-AZ exhibits positive temperature coefficient (+23 mV/°C typical), making it suitable for temperature-compensated references when paired with negative-coefficient devices. It is rated for 10 μA maximum reverse leakage at VR = 23 V and supports constant-current sink operation up to 200 mA forward current.
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; enables ±2.8% regulation accuracy) |
| Power Dissipation (P) | 1.0 W at TA = 25°C (derates linearly above 25°C per Figure 1; requires thermal pad for full rating) |
| Dynamic Impedance (ZZ) | ≤18 Ω at IZ = 10 mA (ensures minimal output voltage shift under load transients) |
| Zener Temp. Coefficient (γZ) | +23 mV/°C typical (supports predictable drift compensation in reference designs) |
| Reverse Leakage (IR) | ≤10 μA at VR = 23 V (guarantees low standby power loss in clamping circuits) |
| Surge Reverse Power (PRSM) | 400 W (t = 10 μs, non-repetitive; protects downstream circuitry from ESD and lightning-induced surges) |
| Junction Temperature (Tj) | 175°C maximum (allows operation in high-temperature industrial enclosures without derating) |
Pinout & Package
RD30F-T7-AZ uses JEDEC DO-41 glass-sealed axial package (3.0 mm Ø × 5.0 mm max length) with black cathode band marking. The DHD (Double Heatsink Diode) planar construction enables dual-side thermal conduction through lead frames.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Forward current entry / Reverse bias reference ground | Connected to system ground or lower-potential node; defines reference point for zener regulation |
| Cathode (Lead 2, marked) | Zener voltage output / Reverse bias high side | Provides stable 30 V reference potential; must be connected to unregulated input or surge source |
Key Features
| Feature | Design Value |
|---|---|
| E24-series zener voltage standardization | Enables interchangeability across 2–82 V range without redesigning feedback networks |
| B3-grade voltage binning | Guarantees tight 29.57–31.26 V window for high-accuracy reference applications |
| DO-41 glass-sealed DHD construction | Delivers robust moisture resistance and 175°C junction rating for harsh environments |
| Positive temperature coefficient (+23 mV/°C) | Permits thermal drift cancellation when cascaded with negative-TC components |
| 400 W surge rating (10 μs) | Replaces discrete TVS in cost-sensitive 30 V rail protection without external components |
Applications
| Power Supply Voltage Reference | Overvoltage Clamp for 24 V Systems |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated DC-DC converters with ±1% output tolerance requirement. IC Role / Device Role / Timing Role: Zener diode providing precise 30 V reference to optocoupler input or error amplifier divider network. Use Value: Maintains regulation accuracy over −40°C to +85°C ambient due to known +23 mV/°C drift and low ZZ. | Use Scenario: Protecting PLC I/O modules against 24 V rail transients exceeding 30 V during inductive load switching. IC Role / Device Role / Timing Role: Shunt clamping element diverting surge energy to ground before IC damage occurs. Use Value: Absorbs 400 W transient pulses (10 μs) without degradation, eliminating need for larger TVS diodes. |
| Waveform Limiter in Signal Conditioning | Constant-Current Sink for LED Biasing |
Use Scenario: Limiting analog sensor output swing to ±30 V in industrial data acquisition front-ends. IC Role / Device Role / Timing Role: Bidirectional clipping diode pair (with series resistor) bounding signal amplitude. Use Value: Low dynamic impedance ensures sharp clipping threshold and minimal distortion at 10 kHz bandwidth. | Use Scenario: Setting fixed bias current for high-brightness indicator LEDs in control panels. IC Role / Device Role / Timing Role: Current-regulating shunt element maintaining 10 mA through LED string. Use Value: Stable 30 V reference enables predictable current via series resistor, unaffected by supply ripple. |
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 (wider than RD30F-T7-AZ B3 grade), 500 mW rating | Limited to lower-power references; insufficient for 1 W continuous dissipation | Select only for space-constrained PCBs where thermal margin allows derating |
| BZX85C30 (Nexperia) | 30 V nominal, ±5% tolerance, DO-41, 1.3 W rating, γZ = +25 mV/°C | Higher power headroom but looser voltage binning reduces reference precision | Prefer when surge immunity is secondary to thermal margin in high-ambient designs |
Compared with 1N5256BRLG and BZX85C30, RD30F-T7-AZ offers tighter B3-grade voltage control (±2.8%), identical DO-41 footprint, and optimized thermal performance for sustained 1 W operation-making it the preferred choice for precision industrial voltage references requiring long-term stability.
Availability
RD30F-T7-AZ is available at Aetrix Electronics and suitable for industrial power supplies, programmable logic controller (PLC) protection circuits, and analog signal conditioning systems requiring stable component supply and long-lifecycle support.
Supply support for RD30F-T7-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 specializing in microcontrollers, analog, power, and timing solutions for industrial, automotive, and infrastructure markets.
RD30F-T7-AZ belongs to the RD2.0F–RD82F planar zener diode family, engineered for high-reliability voltage regulation and transient suppression in industrial equipment operating across extended temperature ranges.
FAQ
What is the exact zener voltage range for RD30F-T7-AZ?
The RD30F-T7-AZ is specified as B3 grade, with a guaranteed zener voltage range of 29.57 V to 31.26 V at IZ = 10 mA and TA = 25°C. This ±2.8% tolerance is tighter than standard B-grade parts and supports high-accuracy reference designs without post-production sorting.
Does RD30F-T7-AZ have a defined cathode marking?
Yes, RD30F-T7-AZ features a black cathode band on the glass body, consistent with JEDEC DO-41 polarity convention. The cathode (marked end) connects to the higher-potential node in zener regulation or clamping configurations, while the anode connects to ground or lower potential.
Can RD30F-T7-AZ replace a 24 V zener diode in overvoltage protection?
No-RD30F-T7-AZ is a 30 V device and must only be used where the protected rail's maximum steady-state voltage is below 29.57 V. For 24 V systems, it provides appropriate headroom (≈25% above nominal), but using it in place of a 24 V zener would risk undervoltage clamping and functional failure.
What is the maximum allowable surge pulse duration for RD30F-T7-AZ?
RD30F-T7-AZ is rated for 400 W non-repetitive surge reverse power at pulse width t = 10 μs (per Figure 7). Pulse durations longer than 10 μs require derating per the PRSM vs. t curve; for example, at 100 μs, maximum surge power drops to ~100 W.
Is RD30F-T7-AZ compliant with RoHS and lead-free assembly processes?
Yes, RD30F-T7-AZ meets EU RoHS Directive requirements and is compatible with lead-free reflow soldering profiles. Renesas confirms compliance in its environmental documentation, and the DO-41 glass package contains no restricted substances above threshold limits.
RD30F-T7-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-T7-AZ FAQ
1.How can I place an order for RD30F-T7-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD30F-T7-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-T7-AZ reliable?
The price and inventory of RD30F-T7-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-T7-AZ is usually 5 days.
3.What payment methods are accepted for RD30F-T7-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD30F-T7-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD30F-T7-AZ?
RD30F-T7-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD30F-T7-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-T7-AZ?
For technical support, including RD30F-T7-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD30F-T7-AZ requirements.
6.How does Aetrix verify that RD30F-T7-AZ is sourced from the original manufacturer or authorized distributors?
All RD30F-T7-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-T7-AZ meets industry standards.
7.What is the process for return or replacement of RD30F-T7-AZ?
All RD30F-T7-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD30F-T7-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-T7-AZ part is unused and in its original packaging.
Return procedure for RD30F-T7-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD30F-T7-AZ Tags
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