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Renesas RD7.5F-T7
- Part No.:
- RD7.5F-T7
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD7.5F-T7.pdf
- Description:
- DIODE ZENER
- Quantity:
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- Shipping:
Inventory:10,000
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Product details
Overview
RD7.5F-T7 from Renesas Electronics is a 1 W planar-type silicon zener diode in DO-41 glass-sealed package, with nominal zener voltage 7.5 V (B grade, min 6.93 V / max 7.80 V), dynamic impedance ≤4 Ω at 40 mA, and temperature coefficient +4.0 mV/°C. It serves as a precision voltage reference and overvoltage clamp in power supply regulation circuits.
For engineers reviewing the RD7.5F-T7 datasheet, RD7.5F-T7 pinout, RD7.5F-T7 application, or RD7.5F-T7 equivalent, this device is selected for stable 7.5 V regulation in industrial power rails, ESD protection interfaces, and analog signal conditioning where ±5% tolerance and low dynamic impedance are required.
Technical Context
This zener diode employs a planar junction structure with double heatsink (DHD) design to achieve 1 W continuous power dissipation and 400 W surge capability at 10 μs pulse width. Its thermal resistance is optimized for PCB copper area mounting, with Rth dropping from 240 °C/W (S = 5 mm²) to 120 °C/W (S = 20 mm²).
The RD7.5F-T7 operates within a junction temperature range of −65 °C to +175 °C and exhibits a positive temperature coefficient (+4.0 mV/°C typical), making it suitable for biasing circuits requiring predictable drift compensation. Reverse leakage remains ≤20 μA at 5.0 V test voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.93 V min / 7.80 V max at IZ = 40 mA - defines usable regulation band under standard test conditions |
| Dynamic Impedance (ZZ) | ≤4 Ω max at IZ = 40 mA - ensures minimal output voltage variation under load transients |
| Power Dissipation (P) | 1.0 W at TA = 25 °C - sets maximum steady-state thermal limit without heatsinking |
| Surge Reverse Power (PRSM) | 400 W at t = 10 μs - enables transient overvoltage suppression in surge-prone inputs |
| Temperature Coefficient (γZ) | +4.0 mV/°C typical - provides predictable positive drift for temperature-compensated references |
| Reverse Current (IR) | ≤20 μA max at VR = 5.0 V - guarantees low standby leakage in high-impedance bias networks |
| Junction Temperature (Tj) | −65 °C to +175 °C - supports operation in extended industrial ambient environments |
Pinout & Package
RD7.5F-T7 uses the JEDEC 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 | Connected to lower-potential node in reverse-biased zener configuration |
| Cathode | Zener breakdown terminal | Marked with black band; connected to higher-potential node for voltage regulation |
Key Features
| Feature | Design Value |
|---|---|
| 1 W Planar Zener Structure | Enables stable regulation with low noise and repeatable breakdown characteristics across temperature |
| E24-Series Voltage Standardization | Supports interoperability with common BOM libraries and reduces inventory SKUs for 7.5 V reference needs |
| DO-41 Glass Package | Provides hermetic sealing, mechanical robustness, and compatibility with standard through-hole assembly processes |
| Double Heatsink Diode (DHD) Design | Improves thermal transfer to PCB copper, allowing sustained 1 W operation with minimal footprint heating |
| Positive Temperature Coefficient | Facilitates series stacking with negative-coefficient devices to achieve near-zero TC voltage references |
Applications
| Voltage Reference Circuit | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Precision analog front-end requiring stable 7.5 V bias for op-amp input stages and ADC reference buffers. IC Role / Device Role: Zener diode operating in reverse breakdown to deliver fixed reference potential independent of supply ripple. Use Value: Low 4 Ω dynamic impedance maintains <±10 mV regulation error under 10 mA load step, critical for 12-bit+ measurement accuracy. |
Use Scenario: DC power input stage exposed to automotive load dump or inductive switching surges. IC Role / Device Role: Shunt clamping element that conducts excess energy above 7.8 V to ground during transient events. Use Value: 400 W surge rating at 10 μs absorbs ISO 7637-2 Pulse 1/2a energy without degradation, protecting downstream regulators. |
| Waveform Limiting Circuit | Constant-Current Bias Generator |
Use Scenario: Audio signal path limiting to prevent amplifier clipping and speaker damage in consumer audio amplifiers. IC Role / Device Role: Bidirectional clamping pair (with series diode) to clip signal peaks at ±7.5 V thresholds. Use Value: Tight 6.93–7.80 V tolerance ensures symmetrical clipping levels and preserves signal fidelity below threshold. |
Use Scenario: LED driver bias network requiring stable current source for sensor excitation or photodiode feedback. IC Role / Device Role: Zener-based current source with series resistor, delivering ~10 mA constant current into variable load. Use Value: +4.0 mV/°C TC allows predictable current drift calibration; 1 W rating supports continuous operation at full bias. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4733A | Same 5.1 V nominal rating but different tolerance (±5% vs. RD7.5F-T7's B grade), higher ZZ (17 Ω), and lower PRSM (100 W) | Not suitable for 7.5 V systems; requires redesign of reference voltage level and may not survive same surge conditions | Select only if legacy 5.1 V design reuse is mandatory and surge immunity is secondary |
| BZX55-C7V5 | 7.5 V nominal, ±5% tolerance, ZZ ≤10 Ω at 35 mA, but rated for only 500 mW continuous power and lacks DHD thermal enhancement | Requires larger PCB copper area or derating for 1 W operation; less robust in thermally constrained layouts | Acceptable for low-power portable designs where space limits heatsinking, but not for industrial 1 W continuous use |
Compared with RD7.5F-T7, the 1N4733A targets a different voltage class and offers inferior surge handling, while the BZX55-C7V5 matches voltage but sacrifices thermal performance and surge margin-making RD7.5F-T7 the preferred choice for demanding 1 W, high-reliability 7.5 V regulation.
Availability
RD7.5F-T7 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and test equipment requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for RD7.5F-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 global semiconductor leader formed in 2010 via merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power devices for industrial and automotive markets.
RD7.5F-T7 belongs to Renesas' legacy planar zener diode family designed for general-purpose voltage regulation and protection in standard-grade applications including office equipment, industrial controls, and consumer electronics.
FAQ
What is the exact zener voltage tolerance for RD7.5F-T7?
The RD7.5F-T7 is specified in the B grade with a zener voltage range of 6.93 V minimum to 7.80 V maximum at 40 mA test current. This ±5.7% tolerance reflects the full spread across production lots and is confirmed in Renesas Document No. D13936EJ5V0DS, page 3. RD7.5F-T7 must be selected with this range in mind for precision reference designs.
Does RD7.5F-T7 have a defined cathode marking, and how is it identified?
Yes, RD7.5F-T7 features a black cathode band on the glass body of its DO-41 package, per JEDEC standard marking convention. This band identifies the cathode terminal, which must be connected to the higher-potential node in reverse-bias operation. The anode is the unmarked end, and polarity verification is essential before PCB layout or assembly.
Can RD7.5F-T7 be used in surface-mount designs?
No, RD7.5F-T7 is exclusively a through-hole DO-41 axial package and is not available in SMD variants. Its glass body and lead form factor require hole mounting and wave or hand soldering. For SMT equivalents, engineers should evaluate Renesas' surface-mount zener families such as the NZ9F series-but those differ in voltage grading, power rating, and thermal behavior from RD7.5F-T7.
What is the maximum allowable surge pulse duration for RD7.5F-T7 at 400 W?
RD7.5F-T7 supports a single non-repetitive surge reverse power of 400 W only at a pulse width of 10 μs, as defined in Figure 7 of the datasheet. Longer pulses require proportional derating-for example, at 100 μs, the safe surge power drops to approximately 40 W. Exceeding these limits risks irreversible junction damage in RD7.5F-T7.
Is RD7.5F-T7 compliant with RoHS and lead-free assembly requirements?
RD7.5F-T7 meets EU RoHS Directive requirements as confirmed by Renesas' environmental compliance documentation. Its DO-41 glass package contains no restricted substances above threshold limits, and the leads are tin-plated for compatibility with lead-free reflow profiles up to 260 °C peak temperature, consistent with standard J-STD-020 guidelines for RD7.5F-T7.
RD7.5F-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:
- -
RD7.5F-T7 FAQ
1.How can I place an order for RD7.5F-T7 through Aetrix?
Please submit a Request for Quotation (RFQ) for RD7.5F-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 RD7.5F-T7 reliable?
The price and inventory of RD7.5F-T7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD7.5F-T7 is usually 5 days.
3.What payment methods are accepted for RD7.5F-T7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD7.5F-T7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD7.5F-T7?
RD7.5F-T7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD7.5F-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 RD7.5F-T7?
For technical support, including RD7.5F-T7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD7.5F-T7 requirements.
6.How does Aetrix verify that RD7.5F-T7 is sourced from the original manufacturer or authorized distributors?
All RD7.5F-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 RD7.5F-T7 meets industry standards.
7.What is the process for return or replacement of RD7.5F-T7?
All RD7.5F-T7 units undergo pre-shipment inspection (PSI). If there is an issue with RD7.5F-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 RD7.5F-T7 part is unused and in its original packaging.
Return procedure for RD7.5F-T7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD7.5F-T7 Tags
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MM5Z5V1ST1G
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