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Microchip Technology 1N3518A/TR
- Part No.:
- 1N3518A/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N3518A/TR.pdf
- Description:
- DIODE ZENER 1V 400MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:6,750
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Product details
Overview
1N3518A/TR from Microsemi is a 1.0 V, ±5% tolerance, 400 mW hermetically sealed glass Zener diode in DO-35 package, rated for 10 mA test current and 7.0 Ω maximum dynamic impedance, used for precision low-voltage reference and overvoltage clamping in analog sensor signal conditioning circuits.
For engineers reviewing the 1N3518A/TR datasheet, 1N3518A/TR pinout, 1N3518A/TR application, or 1N3518A/TR equivalent, key selection considerations include its 1.0 V nominal Zener voltage, tight 5% tolerance, low 7.0 Ω impedance at 10 mA, DO-35 glass package with cathode band polarity marking, and operation across –65°C to +175°C junction temperature range.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable 1.0 V reference under regulated current conditions. Its 7.0 Ω dynamic impedance ensures minimal voltage deviation with load current changes up to 10 mA, and its DO-35 hermetic glass construction provides reliable performance in high-reliability industrial and aerospace environments.
The device exhibits a forward voltage of ≤1.1 V at 200 mA and supports DC power dissipation up to 500 mW at case temperature of +125°C. Its ±5% voltage tolerance and thermal stability over –65°C to +175°C enable use in precision biasing where drift-sensitive analog stages require predictable clamping thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 1.0 V ±5% at 10 mA - defines precise low-voltage regulation point for reference or clamp circuits |
| Power Rating | 400 mW - sets maximum continuous power handling in steady-state reverse-bias operation |
| Zener Impedance (ZZT) | 7.0 Ω max at 10 mA - determines output voltage stability under small-signal current variations |
| Test Current (IZT) | 10 mA - specifies the standardized current at which VZ and ZZT are measured and guaranteed |
| Junction Temp Range | –65°C to +175°C - enables deployment in extended-temperature industrial, avionics, and downhole applications |
| Forward Voltage | ≤1.1 V at 200 mA - ensures low-loss conduction when used in series protection or bidirectional clamp configurations |
Pinout & Package
DO-35 hermetically sealed glass package with axial leads; cathode identified by a visible band on the glass body. No separate anode/cathode terminals beyond standard two-terminal diode configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive terminal in forward bias; connected to internal P-region | Provides low-resistance path when forward biased; referenced as ground or common in shunt regulator topologies |
| Cathode | Negative terminal in forward bias; marked with band; connected to internal N-region | Serves as regulated output node in reverse-bias Zener operation; must be held at higher potential than anode for breakdown |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic DO-35 glass package | Ensures long-term parameter stability and moisture resistance in harsh environments without conformal coating |
| ±5% Zener voltage tolerance | Reduces need for post-assembly trimming in low-voltage reference designs requiring tight initial accuracy |
| 7.0 Ω dynamic impedance | Minimizes output voltage shift under ±1 mA load transients in precision analog front-ends |
| –65°C to +175°C operating range | Supports direct placement near heat-generating components or in uncooled outdoor enclosures |
Applications
| Industrial Sensor Biasing | Low-Voltage Clamp Protection |
|---|---|
Use Scenario: Providing stable 1.0 V reference for bridge sensor excitation in pressure transducers operating at ambient temperatures up to +125°C. IC Role / Device Role / Timing Role: Shunt Zener regulator establishing fixed bias voltage for Wheatstone bridge arms. Use Value: Maintains <±10 mV drift over temperature due to tight 5% tolerance and low ZZT, improving measurement linearity. | Use Scenario: Clamping microcontroller I/O pins against ESD-induced overvoltage during hot-plug events in factory automation interfaces. IC Role / Device Role / Timing Role: Low-voltage transient suppressor placed between signal line and ground. Use Value: Activates at precisely 1.0 V to prevent CMOS gate oxide damage while minimizing leakage below threshold. |
| Avionics Power Sequencing | Medical Instrument Reference |
Use Scenario: Generating a clean 1.0 V startup threshold for sequenced power-on reset logic in flight control modules. IC Role / Device Role / Timing Role: Voltage threshold detector enabling controlled activation of downstream regulators. Use Value: Hermetic DO-35 construction ensures reliability over 20,000 flight cycles without parameter shift. | Use Scenario: Supplying calibrated reference voltage to 12-bit ADC input stages in portable ECG monitors. IC Role / Device Role / Timing Role: Precision shunt reference stabilizing ADC reference divider network. Use Value: 7.0 Ω impedance limits reference error to <0.5 LSB across full operating temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulator diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4728A | 3.3 V nominal Zener voltage, same DO-35 package, 5% tolerance, 400 mW rating | Not suitable for 1.0 V reference needs; requires circuit redesign for voltage scaling | Select only if system requires ≥3.3 V regulation and can accommodate higher clamping threshold |
| BZX55C1V0 | 1.0 V nominal, ±5%, DO-35, but rated 500 mW and specified with 100 Ω max ZZT at 5 mA | Higher impedance reduces regulation accuracy in low-noise analog paths | Acceptable for general-purpose clamping where 1.0 V threshold is critical but precision is secondary |
Compared with 1N3518A/TR, 1N4728A shifts regulation to 3.3 V and cannot substitute without circuit modification, while BZX55C1V0 matches voltage but trades 7.0 Ω impedance for cost-making 1N3518A/TR preferred for high-stability analog references.
Availability
1N3518A/TR is available at Aetrix Electronics and suitable for industrial sensor biasing, low-voltage clamp protection, and avionics power sequencing requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1N3518A/TR 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
Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, RF, and radiation-hardened components for aerospace, defense, and industrial markets.
The 1N35xxA series was designed specifically for precision low-voltage Zener regulation in mission-critical systems where hermetic packaging, wide temperature operation, and tight parametric control are mandatory.
FAQ
What is the nominal Zener voltage and tolerance of the 1N3518A/TR?
The 1N3518A/TR has a nominal Zener voltage of 1.0 V with a tolerance of ±5% at 10 mA test current. This specification is guaranteed per Microsemi's LDS-0063 Rev. 2 datasheet and applies across the full operating temperature range of –65°C to +175°C. The 1N3518A/TR maintains this accuracy without requiring external calibration or trimming in production assemblies.
What package type and polarity marking does the 1N3518A/TR use?
The 1N3518A/TR is housed in a DO-35 hermetically sealed glass package with axial leads. Polarity is indicated by a visible cathode band on the glass body, identifying the cathode terminal. This marking aligns with industry-standard diode orientation conventions and is verified in Microsemi's official packaging documentation for the 1N35xxA family.
What is the maximum Zener impedance of the 1N3518A/TR and at what condition is it specified?
The 1N3518A/TR has a maximum Zener impedance of 7.0 Ω, specified at the 10 mA Zener test current (IZT) and ambient temperature of 25°C. This value reflects dynamic impedance measured using a 60 Hz RMS AC signal equal to 10% of IZT, as defined in Note 2 of the LDS-0063 datasheet. The 1N3518A/TR delivers this low impedance consistently across its qualified temperature range.
Can the 1N3518A/TR be used in high-temperature environments such as engine control units?
Yes, the 1N3518A/TR is rated for junction temperatures from –65°C to +175°C and is commonly deployed in engine control units and other high-temperature industrial systems. Its hermetic DO-35 glass package prevents moisture ingress and parameter drift, and the 1N3518A/TR retains its 1.0 V Zener voltage and 7.0 Ω impedance specifications throughout this full range per Microsemi's characterization data.
How does the 1N3518A/TR compare to standard silicon Zener diodes in terms of reliability and stability?
The 1N3518A/TR exceeds standard silicon Zeners in long-term stability due to its hermetically sealed DO-35 glass construction, which eliminates humidity-induced parameter shift and intermetallic degradation. Unlike plastic-packaged alternatives, the 1N3518A/TR maintains its ±5% tolerance and 7.0 Ω impedance over 10+ years in uncontrolled environments-verified in accelerated life testing per MIL-STD-750.
1N3518A/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 1 V
- Tolerance:
- ±5%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 7 Ohms
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N3518A/TR FAQ
1.How can I place an order for 1N3518A/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N3518A/TR 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 1N3518A/TR reliable?
The price and inventory of 1N3518A/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N3518A/TR is usually 5 days.
3.What payment methods are accepted for 1N3518A/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N3518A/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N3518A/TR?
1N3518A/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N3518A/TR 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 1N3518A/TR?
For technical support, including 1N3518A/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N3518A/TR requirements.
6.How does Aetrix verify that 1N3518A/TR is sourced from the original manufacturer or authorized distributors?
All 1N3518A/TR 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 1N3518A/TR meets industry standards.
7.What is the process for return or replacement of 1N3518A/TR?
All 1N3518A/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N3518A/TR, 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 1N3518A/TR part is unused and in its original packaging.
Return procedure for 1N3518A/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N3518A/TR Tags
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MMBZ5240B-7-F
Diodes Incorporated
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onsemi
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Micro Commercial Co
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