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Renesas RD7.5ES-AZ
- Part No.:
- RD7.5ES-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD7.5ES-AZ.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
RD7.5ES-AZ from Excel Semiconductor is a DO-34 glass-sealed Zener diode with nominal zener voltage 7.5 V, dynamic impedance ≤25 Ω at 5 mA, knee impedance ≤120 Ω at 0.5 mA, and reverse current ≤0.5 μA at 4.0 V. It delivers stable voltage regulation in low-power analog reference and overvoltage protection circuits.
For engineers reviewing the RD7.5ES-AZ datasheet, RD7.5ES-AZ pinout, RD7.5ES-AZ application, or RD7.5ES-AZ equivalent, key selection criteria include its 7.5 V ±5% tolerance (E24 standard), 400 mW power dissipation, 100 W surge capability, DO-34 package compatibility with 5 mm pitch PCB insertion, and operation up to 175 °C junction temperature.
Technical Context
This Zener diode uses planar process technology to ensure tight Vz distribution and repeatable breakdown characteristics across production lots. Its E24-standardized zener voltage (7.29–7.67 V) and low Zzt (≤25 Ω) support precision voltage clamping and reference stability under regulated DC bias.
The device operates with a defined test current of 5 mA for Vz and Zzt, and 0.5 mA for Zzk and IR. Its thermal design accommodates ambient temperatures from –65 °C to +175 °C, with transient thermal impedance optimized for short-duration surge events per Figure 11.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Vz) | 7.29–7.67 V at Iz = 5 mA - ensures ±5% tolerance for reliable voltage reference in analog circuits |
| Dynamic Impedance (Zzt) | ≤25 Ω at Iz = 5 mA - minimizes output voltage variation under load current changes |
| Knee Impedance (Zzk) | ≤120 Ω at Iz = 0.5 mA - maintains regulation integrity near turn-on threshold |
| Reverse Current (IR) | ≤0.5 μA at VR = 4.0 V - guarantees low leakage in standby and low-power monitoring paths |
| Power Dissipation (Pv) | 400 mW at Tj = 25 °C - defines continuous DC power handling on standard FR-4 PCBs |
| Surge Reverse Power (PRSM) | 100 W - supports transient overvoltage suppression without failure |
| Junction Temperature (Tj) | –65 to +175 °C - enables deployment in industrial and automotive under-hood environments |
Pinout & Package
RD7.5ES-AZ is housed in a JEDEC DO-34 glass-sealed axial package with cathode identified by a band. The device has two terminals: anode and cathode. No internal circuitry or multi-pin configuration applies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower potential side in reverse-biased Zener operation; carries forward current up to 150 mA |
| Cathode | Zener breakdown terminal | Marked with band; connected to higher potential side during regulation; sustains 7.5 V reverse breakdown |
Key Features
| Feature | Design Value |
|---|---|
| DO-34 glass package | Enables manual or automated 5 mm pitch PCB insertion and withstands reflow-compatible thermal profiles |
| Planar process construction | Delivers consistent Vz tolerance and long-term parameter stability across temperature and time |
| E24-standardized Vz | Ensures interchangeability within standardized resistor/diode value series for BOM simplification |
| 100 W surge rating | Provides single-pulse transient immunity without external TVS coordination in cost-sensitive designs |
Applications
| Industrial Sensor Reference | Low-Power Voltage Clamp |
|---|---|
Use Scenario: Providing stable 7.5 V reference for 12-bit ADC biasing in temperature transmitters. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to fix reference node voltage. Use Value: Low Zzt (≤25 Ω) limits reference drift under varying sensor excitation current, improving measurement repeatability. |
Use Scenario: Clamping microcontroller I/O pins against ESD-induced transients in factory automation panels. IC Role / Device Role / Timing Role: Passive voltage limiter absorbing fast-rising surges before IC input structures. Use Value: 100 W PRSM rating handles 8/20 μs surges without degradation, eliminating need for secondary TVS in space-constrained layouts. |
| AC Line Monitoring | LED Constant-Current Bias |
Use Scenario: Rectified AC line sensing in smart meter auxiliary power supplies. IC Role / Device Role / Timing Role: Zener shunt regulator stabilizing bias rail for optocoupler feedback circuitry. Use Value: 175 °C max Tj allows direct mounting near transformer windings without derating concerns. |
Use Scenario: Setting reference voltage for LM317-based LED driver in architectural lighting modules. IC Role / Device Role / Timing Role: Precision voltage source defining current-set resistor voltage drop. Use Value: Tight Vz tolerance (±5%) ensures ±1.5% LED current accuracy across production units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4734A | Vz = 5.6 V (fixed), Zzt = 5 Ω @ 45 mA - lower voltage, tighter Zzt but higher test current | Not suitable for 7.5 V reference; requires redesign of bias network | Select only if system requires 5.6 V and can accommodate higher Iz |
| BZX55-C7V5 | Vz = 7.5 V ±5%, Zzt = 30 Ω @ 5 mA - slightly higher impedance, same DO-35 package | Same functional role; DO-35 has larger diameter (2.2 mm vs. DO-34's 1.8 mm) affecting board space | Acceptable substitute where 0.4 mm radial clearance permits |
Compared with RD7.5ES-AZ, 1N4734A serves a different voltage tier and cannot replace it directly, while BZX55-C7V5 offers identical Vz but requires mechanical verification due to DO-35's larger case size and marginally higher Zzt.
Availability
RD7.5ES-AZ is available at Aetrix Electronics and suitable for industrial sensor reference, low-power voltage clamp, and AC line monitoring applications requiring stable component supply and long-lifecycle support.
Supply support for RD7.5ES-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
Excel Semiconductor is a China-based discrete semiconductor manufacturer specializing in Zener, rectifier, and switching diodes with emphasis on industrial-grade reliability and JEDEC-compliant packaging.
The RD2.0ES–RD39ES series was designed specifically for cost-sensitive, high-volume voltage regulation and transient suppression in power supplies, instrumentation, and control systems.
FAQ
What is the zener voltage tolerance of RD7.5ES-AZ?
The RD7.5ES-AZ has a zener voltage range of 7.29 V to 7.67 V at 5 mA test current, corresponding to ±5% tolerance aligned with E24 standard values. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the Rev. 3e datasheet and applies across the full operating temperature range.
Is RD7.5ES-AZ compatible with automated PCB assembly processes?
Yes, RD7.5ES-AZ uses a DO-34 glass package with 29 mm body length and 1.8 mm diameter, designed for axial insertion with 5 mm pitch. Its glass seal and lead finish support wave soldering and selective reflow profiles, and it meets JEDEC DO-34 mechanical specifications for automated handling.
What is the maximum reverse current specification for RD7.5ES-AZ?
The RD7.5ES-AZ specifies a maximum reverse current (IR) of 0.5 μA at VR = 4.0 V, measured at Tj = 25 °C. This low leakage supports energy-efficient standby modes in battery-powered sensors and ensures minimal error contribution in high-impedance reference nodes.
Can RD7.5ES-AZ be used in surge protection applications?
Yes, RD7.5ES-AZ is rated for 100 W surge reverse power (PRSM), validated per standard 10/1000 μs waveform testing. It functions effectively as a primary or secondary clamping element in low-energy surge scenarios such as I/O line protection and signal conditioning front-ends.
Does RD7.5ES-AZ have a specified temperature coefficient?
The RD7.5ES-AZ datasheet does not list a numeric temperature coefficient (TC) value in the Electrical Characteristics table. However, Figure 9 shows typical TC behavior for the RD2.0ES–RD39ES family, indicating that 7.5 V devices exhibit near-zero TC around 7 V, with magnitude increasing above 10 V - confirming stable performance near room temperature.
RD7.5ES-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:
- -
RD7.5ES-AZ FAQ
1.How can I place an order for RD7.5ES-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD7.5ES-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 RD7.5ES-AZ reliable?
The price and inventory of RD7.5ES-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD7.5ES-AZ is usually 5 days.
3.What payment methods are accepted for RD7.5ES-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD7.5ES-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD7.5ES-AZ?
RD7.5ES-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD7.5ES-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 RD7.5ES-AZ?
For technical support, including RD7.5ES-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD7.5ES-AZ requirements.
6.How does Aetrix verify that RD7.5ES-AZ is sourced from the original manufacturer or authorized distributors?
All RD7.5ES-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 RD7.5ES-AZ meets industry standards.
7.What is the process for return or replacement of RD7.5ES-AZ?
All RD7.5ES-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD7.5ES-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 RD7.5ES-AZ part is unused and in its original packaging.
Return procedure for RD7.5ES-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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