My Inquiry
My Account
Renesas RD30F-T7
- Part No.:
- RD30F-T7
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD30F-T7.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
RD30F-T7 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, rated for 175°C junction temperature, and is designed for precision voltage regulation and surge absorption in industrial power supplies and analog signal conditioning circuits.
For engineers reviewing the RD30F-T7 datasheet, RD30F-T7 pinout, RD30F-T7 application, or RD30F-T7 equivalent, this device serves as a stable, low-drift voltage reference in DC-DC feedback loops, overvoltage clamp circuits, and waveform limiting stages where ±3% voltage tolerance and <25 Ω dynamic impedance are required.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified test current of 10 mA and maintains regulation across ambient temperatures from −65°C to +175°C. Its DO-41 package provides dual heatsinking capability via axial leads and glass passivation, enabling reliable thermal dissipation up to 1 W at 25°C ambient.
The RD30F-T7 exhibits a positive temperature coefficient (+23 mV/°C typical), indicating increasing zener voltage with rising junction temperature - a key consideration in thermally coupled bias networks and temperature-compensated references. Surge reverse power rating is 400 W for 10 μs pulses, supporting transient suppression in low-energy input protection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 29.57–31.26 V at IZ = 10 mA (B3 grade); ensures tight regulation tolerance for feedback sensing in 24–32 V systems. |
| Dynamic Impedance (ZZ) | 18 Ω max at IZ = 10 mA; minimizes output voltage variation under load transients in reference circuits. |
| Power Dissipation (P) | 1.0 W at TA = 25°C; requires derating above 25°C per Figure 1 - critical for PCB layout thermal management. |
| Junction Temperature (Tj) | 175°C maximum; enables operation in high-ambient industrial environments without thermal shutdown. |
| Reverse Current (IR) | 10 μA max at VR = 23 V; guarantees low leakage in high-impedance bias networks and precision clamping. |
| Temperature Coefficient (γZ) | +23 mV/°C typical; supports predictable drift compensation when paired with negative-TC components. |
| Surge Reverse Power (PRSM) | 400 W for t = 10 μs; absorbs short-duration ESD or inductive kick energy without degradation. |
Pinout & Package
RD30F-T7 uses the JEDEC-standard DO-41 axial glass package (3.0 mm diameter × 5.0 mm length), with cathode indicated by a black band. The device has two terminals: anode and cathode - no internal circuitry or additional pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node in reverse-biased configuration | Connected to system ground or lower-potential rail when used as shunt regulator or clamp. |
| Cathode | Zener breakdown terminal / Voltage reference output node | Provides regulated voltage referenced to anode; marked with black band for polarity identification. |
Key Features
| Feature | Design Value |
|---|---|
| Planar-type glass-sealed DHD structure | Enables dual thermal path conduction through axial leads, improving power handling vs. standard DO-41 diodes. |
| E24-series zener voltage grading | Supports standardized B1/B2/B3 tolerance bins - RD30F-T7 corresponds to B3 (±2.8%) for tighter design margins. |
| Low dynamic impedance (18 Ω) | Reduces output impedance in shunt regulator configurations, enhancing line/load regulation performance. |
| Positive temperature coefficient (+23 mV/°C) | Allows temperature-stable reference generation when combined with NTC thermistors or complementary diodes. |
| 175°C maximum junction temperature | Permits use in enclosed industrial enclosures or near heat-generating components without derating penalties. |
Applications
| Industrial Power Supply Feedback | Overvoltage Clamp Circuit |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters using optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 30 V threshold to TL431 or similar error amplifier. Use Value: Maintains ±1% output accuracy across temperature due to stable 30 V zener point and low ZZ. |
Use Scenario: Protecting microcontroller I/O pins from 36 V transients on 24 V industrial bus lines. IC Role / Device Role / Timing Role: Fast-acting crowbar element clamping voltage before TVS activation threshold. Use Value: Responds within nanoseconds to limit peak voltage to ≤31.3 V, preventing latch-up in 3.3 V logic interfaces. |
| Waveform Limiter in Signal Conditioning | Temperature-Compensated Reference Generator |
Use Scenario: Limiting AC audio signal amplitude to prevent ADC saturation in industrial sensor front-ends. IC Role / Device Role / Timing Role: Bidirectional clipping diode pair (with series resistor) defining symmetrical ±30 V envelope. Use Value: Delivers consistent clipping threshold across −40°C to +85°C due to predictable γZ behavior. |
Use Scenario: Generating a stable 30 V reference for RTD bridge excitation in process control transmitters. IC Role / Device Role / Timing Role: Primary voltage reference whose drift is offset by parallel-connected NTC network. Use Value: Achieves <±50 ppm/°C net drift over 0–70°C range when paired with 10 kΩ NTC (β = 3950). |
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 (±1.5 V), ZZ = 35 Ω @ 10 mA, DO-35 package | Higher impedance and looser tolerance reduce regulation accuracy in precision feedback loops | Acceptable for non-critical clamping where cost is prioritized over stability |
| BZX84-C30LT1G (onsemi) | 30 V nominal, 5% tolerance, ZZ = 40 Ω @ 5 mA, SOT-23 surface-mount package | Lower power rating (350 mW), unsuitable for 1 W continuous dissipation or surge absorption | Only suitable for low-power signal-level limiting, not power rail regulation |
Compared with RD30F-T7, the 1N5256BRLG offers lower cost but sacrifices regulation precision and thermal robustness, while the BZX84-C30LT1G enables PCB space savings at the expense of power handling and long-term stability under thermal cycling.
Availability
RD30F-T7 is available at Aetrix Electronics and suitable for industrial power supply feedback, overvoltage clamp circuits, and waveform limiter designs requiring stable component supply, long-lifecycle support, and traceable sourcing for production programs.
Supply support for RD30F-T7 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 Japanese semiconductor manufacturer specializing in microcontrollers, analog and power devices, and automotive SoCs, with global R&D and manufacturing infrastructure.
The RD30F-T7 belongs to Renesas' legacy planar Zener diode family designed for industrial-grade voltage reference and protection applications, emphasizing reliability, wide operating temperature range, and standardized E24 voltage selection.
FAQ
What is the zener voltage tolerance for RD30F-T7?
The RD30F-T7 is specified as a B3 grade device, with a zener voltage range of 29.57 V to 31.26 V at 10 mA test current - representing a ±2.8% tolerance about the nominal 30 V value. This tighter binning supports higher-accuracy regulation than standard B-grade parts, and is confirmed in the Electrical Characteristics table of Renesas document D13936EJ5V0DS.
Does RD30F-T7 have a positive or negative temperature coefficient?
The RD30F-T7 exhibits a positive temperature coefficient of +23 mV/°C (typical), meaning its zener voltage increases linearly with junction temperature. This behavior is documented in the "Zener Voltage Temperature Coefficient" column of the RD30F row in the datasheet's Electrical Characteristics table and is characteristic of higher-voltage Zeners (>5 V) in this family.
What package type does RD30F-T7 use, and how is polarity marked?
RD30F-T7 uses the JEDEC-standard DO-41 axial leaded package with glass encapsulation and a Double Heatsink Diode (DHD) structure. Polarity is marked by a black cathode band located near one end of the cylindrical body - the banded end is the cathode, and the unmarked end is the anode.
Can RD30F-T7 be used in surge protection applications?
Yes, RD30F-T7 is rated for 400 W surge reverse power at 10 μs pulse width (non-repetitive), making it suitable for absorbing low-energy transients such as ESD events or switching spikes in 24 V industrial systems. Its 1 W steady-state rating and 175°C junction temperature ensure survivability under repeated moderate surges when properly heatsinked.
Is RD30F-T7 RoHS compliant?
Renesas Electronics confirms RoHS compliance for the RD30F-T7 family per EU Directive 2011/65/EU, as stated in environmental documentation referenced on renesas.com. The device contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits, and is suitable for use in consumer and industrial electronics sold in regulated markets.
RD30F-T7 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 FAQ
1.How can I place an order for RD30F-T7 through Aetrix?
Please submit a Request for Quotation (RFQ) for RD30F-T7 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 reliable?
The price and inventory of RD30F-T7 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 is usually 5 days.
3.What payment methods are accepted for RD30F-T7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD30F-T7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD30F-T7?
RD30F-T7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD30F-T7 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?
For technical support, including RD30F-T7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD30F-T7 requirements.
6.How does Aetrix verify that RD30F-T7 is sourced from the original manufacturer or authorized distributors?
All RD30F-T7 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 meets industry standards.
7.What is the process for return or replacement of RD30F-T7?
All RD30F-T7 units undergo pre-shipment inspection (PSI). If there is an issue with RD30F-T7, 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 part is unused and in its original packaging.
Return procedure for RD30F-T7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD30F-T7 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
