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Renesas RD15F-T7
- Part No.:
- RD15F-T7
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD15F-T7.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
RD15F-T7 from Renesas Electronics is a 1 W planar-type silicon Zener diode in DO-41 glass-sealed DHD package, with nominal zener voltage 15 V (B3 grade: 14.52–15.26 V), dynamic impedance ≤10 Ω at 20 mA, and temperature coefficient +11 mV/°C. It delivers stable voltage reference and surge protection in power supply regulation and waveform clipping circuits.
For engineers reviewing the RD15F-T7 datasheet, RD15F-T7 pinout, RD15F-T7 application, or RD15F-T7 equivalent, key selection criteria include its 15 V zener tolerance (±2.5%), low dynamic impedance for tight regulation, DO-41 thermal performance (Rth = 200°C/W on 5 mm2 copper), and suitability for constant-voltage and transient suppression roles in industrial and consumer power stages.
Technical Context
This device operates as a two-terminal voltage-reference element with reverse-biased junction behavior. Its zener breakdown mechanism provides predictable conduction above 14.52 V, with specified test current IZ = 20 mA and maximum reverse current IR = 10 μA at VR = 12 V.
Thermal design relies on its planar DHD structure enabling 175°C junction temperature and 1 W steady-state dissipation - derated linearly above 25°C ambient per Figure 1. Surge capability reaches 400 W for 10 μs pulses (PRSM), validated under non-repetitive conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 14.52–15.26 V (B3 grade, tested at 20 mA; defines stable regulation window) |
| Power Dissipation (P) | 1.0 W at TA = 25°C (derates to zero at 175°C junction temp) |
| Dynamic Impedance (ZZ) | ≤10 Ω at IZ = 20 mA (ensures <0.2 V output shift per 2 mA load change) |
| Zener Voltage Tempco (γZ) | +11 mV/°C (positive drift supports bias stability in warm environments) |
| Reverse Current (IR) | ≤10 μA at VR = 12 V (low leakage preserves efficiency in high-impedance bias networks) |
| Surge Power (PRSM) | 400 W (10 μs pulse; enables single-event transient suppression without external TVS) |
| Junction Temperature (Tj) | −65 to +175°C (supports operation in unheated industrial enclosures and automotive under-hood proximity) |
Pinout & Package
RD15F-T7 uses a DO-41 axial-leaded glass package (JEDEC standard) with cathode indicated by black band. Leads are tinned copper-clad steel, compatible with wave and reflow soldering per manufacturer guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to circuit ground or lowest potential point in shunt regulator topology |
| Cathode | Zener breakdown terminal / regulated output node | Provides stable 15 V reference when reverse-biased; must be driven through current-limiting resistor |
Key Features
| Feature | Design Value |
|---|---|
| 1 W Planar Zener Structure | Enables reliable power handling in compact DO-41 form factor without metallization failure risk |
| E24-Series Voltage Selection | 15 V nominal fits standardized BOMs across industrial power supply designs |
| B3 Grade Tight Tolerance | ±2.5% VZ spread reduces need for post-production calibration in voltage-reference circuits |
| Positive Temperature Coefficient | +11 mV/°C offsets negative drift of associated pass transistors in compound regulators |
| DO-41 Thermal Performance | Rth = 200°C/W on 5 mm² copper allows >0.7 W continuous dissipation in typical PCB layouts |
Applications
| Voltage Reference Circuit | Waveform Clipper Circuit |
|---|---|
Use Scenario: Precision 15 V reference for ADC biasing and op-amp feedback networks in data acquisition modules. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable excitation voltage independent of supply ripple. Use Value: Low 10 Ω ZZ ensures <0.1% reference error under 1 mA load variation, critical for 12-bit+ conversion accuracy. |
Use Scenario: Clipping audio signal peaks at ±15 V in analog mixer front-ends. IC Role / Device Role / Timing Role: Bidirectional limiter using forward + reverse conduction thresholds. Use Value: Sharp 15 V knee and fast recovery (<50 ns) preserve signal integrity while preventing amplifier saturation. |
| Surge Absorption Circuit | Constant-Current Bias Circuit |
Use Scenario: Protecting 15 V rail inputs against ESD and inductive kickback in PLC I/O modules. IC Role / Device Role / Timing Role: Transient voltage suppressor clamping overvoltage events to safe levels. Use Value: 400 W PRSM rating handles IEC 61000-4-5 Level 3 surges without degradation, eliminating need for secondary TVS. |
Use Scenario: Setting fixed emitter current in discrete transistor amplifiers for sensor signal conditioning. IC Role / Device Role / Timing Role: Constant-current source via series resistor + RD15F-T7 voltage clamp. Use Value: +11 mV/°C tempco compensates for transistor VBE drift, maintaining <±3% current stability from −40°C to +85°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4744A | 15 V nominal, ±5% tolerance, ZZ = 14 Ω @ 20 mA, DO-41, same PD = 1 W | Wider VZ tolerance increases reference uncertainty; higher ZZ degrades regulation under dynamic loads | Acceptable where cost sensitivity outweighs precision; verify thermal margin due to lower surge rating (1 W only) |
| BZX55-C15 | 15 V nominal, ±5% tolerance, ZZ = 30 Ω @ 5 mA, DO-35, PD = 500 mW | Lower power rating limits continuous use; DO-35 package has higher Rth, reducing usable dissipation by ~40% | Suitable only for low-power biasing; not recommended for surge suppression or >0.5 W regulation roles |
Compared with 1N4744A and BZX55-C15, RD15F-T7 offers tighter 15 V tolerance (±2.5%), lower dynamic impedance (≤10 Ω), and full 1 W/400 W surge capability in DO-41 - making it optimal for industrial-grade voltage references and transient protection where regulation accuracy and robustness are prioritized.
Availability
RD15F-T7 is available at Aetrix Electronics and suitable for industrial power supplies, test equipment voltage references, and consumer audio signal limiting requiring stable component supply and long-term obsolescence management.
Supply support for RD15F-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 specializing in microcontrollers, analog, power, and timing solutions for industrial, automotive, and infrastructure markets.
RD15F-T7 belongs to Renesas' legacy planar zener diode family designed for general-purpose voltage regulation and transient suppression in Standard-grade applications including office equipment, communications gear, and industrial controls.
FAQ
What is the exact zener voltage range for RD15F-T7?
The RD15F-T7 has a guaranteed zener voltage range of 14.52 V to 15.26 V at 20 mA test current (B3 grade), measured within 40 ms after power-on per datasheet specification. This ±2.5% tolerance ensures consistent performance across production lots without binning or trimming in most applications.
Can RD15F-T7 replace RD15F in existing designs?
Yes - RD15F-T7 is a direct replacement for RD15F, sharing identical electrical specifications, DO-41 package dimensions, and marking (black cathode band). The "-T7" suffix denotes tape-and-reel packaging; electrical behavior and thermal ratings remain unchanged from the original RD15F part.
What is the maximum continuous power dissipation for RD15F-T7 at 75°C ambient?
At TA = 75°C, RD15F-T7's maximum continuous power dissipation is 0.75 W, calculated using the linear derating curve from Figure 1 in the datasheet (1.0 W at 25°C, zero at 175°C). This requires adequate PCB copper area (≥20 mm²) to maintain junction temperature below 175°C.
Does RD15F-T7 meet RoHS requirements?
Yes - RD15F-T7 complies with EU RoHS Directive 2011/65/EU. Renesas confirms lead-free construction and absence of restricted substances; full compliance documentation is available upon request from Aetrix Electronics or directly via Renesas' environmental portal.
How does the +11 mV/°C temperature coefficient affect RD15F-T7 in precision circuits?
The +11 mV/°C γZ means RD15F-T7's zener voltage rises ~1.1 V over a 100°C ambient range. In precision references, this drift must be compensated - e.g., by pairing with a negative-tempco component or using it in temperature-stabilized enclosures. It is beneficial in bias networks where positive drift counters transistor VBE loss.
RD15F-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:
- -
RD15F-T7 FAQ
1.How can I place an order for RD15F-T7 through Aetrix?
Please submit a Request for Quotation (RFQ) for RD15F-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 RD15F-T7 reliable?
The price and inventory of RD15F-T7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD15F-T7 is usually 5 days.
3.What payment methods are accepted for RD15F-T7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD15F-T7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD15F-T7?
RD15F-T7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD15F-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 RD15F-T7?
For technical support, including RD15F-T7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD15F-T7 requirements.
6.How does Aetrix verify that RD15F-T7 is sourced from the original manufacturer or authorized distributors?
All RD15F-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 RD15F-T7 meets industry standards.
7.What is the process for return or replacement of RD15F-T7?
All RD15F-T7 units undergo pre-shipment inspection (PSI). If there is an issue with RD15F-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 RD15F-T7 part is unused and in its original packaging.
Return procedure for RD15F-T7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD15F-T7 Tags
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