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Microchip Technology 1N5235B/TR
- Part No.:
- 1N5235B/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5235B/TR.pdf
- Description:
- DIODE ZENER 6.8V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:5,492
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Product details
Overview
1N5235B/TR from Microsemi is a 6.8 V, ±5% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 20 mA test current and 5.0 Ω dynamic impedance at IZK = 0.25 mA, used for precision voltage regulation in low-power analog reference and overvoltage protection circuits.
For engineers reviewing the 1N5235B/TR datasheet, 1N5235B/TR pinout, 1N5235B/TR application, or 1N5235B/TR equivalent, key selection criteria include Zener voltage stability across temperature (αVZ = +0.050 %/°C), low reverse leakage (<30 μA @ VR = 5.5 V), and compatibility with manual or wave soldering per MIL-STD-750.
Technical Context
The 1N5235B/TR operates as a two-terminal voltage reference device with cathode-banded polarity, requiring reverse bias for Zener conduction. Its breakdown behavior is characterized by a sharp knee at IZT = 20 mA and a regulated output voltage of 6.8 V ±5% over -65°C to +175°C ambient range.
Thermal performance is defined by junction-to-lead resistance of 250 °C/W at 3/8" lead length and 310 °C/W junction-to-ambient on FR4 board. Forward voltage is limited to 1.5 V max at 200 mA, confirming suitability for bidirectional clamping when paired with series components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 6.8 V ±5% at IZT = 20 mA - defines stable regulation point for reference design |
| Power Dissipation | 0.5 W at 25°C - sets maximum continuous DC power handling before derating |
| Zener Impedance ZZT | 5.0 Ω at IZK = 0.25 mA - ensures minimal voltage variation under light-load transients |
| Temp. Coefficient αVZ | +0.050 %/°C - quantifies voltage drift magnitude over industrial temperature range |
| Reverse Leakage IR | 30 μA max @ VR = 5.5 V - determines quiescent current loss in high-impedance bias networks |
| Operating Temp. | -65°C to +175°C - supports deployment in aerospace, downhole, and automotive under-hood environments |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed glass axial-leaded package with cathode indicated by single black band; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node during Zener operation; forward conduction path |
| Cathode | Banded end | Connected to higher-potential node during regulation; defines Zener breakdown polarity |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Complies with JEDEC 1N5235B standard for interchangeability and test methodology |
| Radiation-hardened construction | Inherently radiation tolerant per MicroNote 050 - suitable for space-grade applications without upscreening |
| ESD-insensitive | Passes MIL-STD-750 Method 1020 - eliminates need for ESD handling controls in assembly |
| Low capacitance | Typical <2 pF - preserves high-frequency signal integrity in RF bias and clamp circuits |
| Tape-and-reel packaging | TR suffix indicates EIA-296 compliant carrier tape - enables automated SMT placement with axial-lead adapters |
Applications
| Industrial Sensor Signal Conditioning | Automotive ECU Reference Voltage |
|---|---|
Use Scenario: Stabilizing excitation voltage for bridge-based pressure sensors in factory automation systems. IC Role / Device Role / Timing Role: Zener diode providing fixed 6.8 V reference to op-amp bias network. Use Value: Maintains sensor output linearity within ±0.1% over -40°C to +85°C due to tight 5% tolerance and predictable +0.050 %/°C drift. |
Use Scenario: Generating stable reference for analog-to-digital conversion of throttle position signals. IC Role / Device Role / Timing Role: Voltage clamp and regulator for microcontroller ADC reference input. Use Value: Ensures consistent 12-bit measurement accuracy despite battery voltage fluctuations between 9 V and 16 V. |
| Medical Instrument Power Supervision | Avionics Overvoltage Protection |
Use Scenario: Monitoring 5 V rail in portable ultrasound units to trigger shutdown on undervoltage. IC Role / Device Role / Timing Role: Zener-based comparator reference in discrete supervisor circuit. Use Value: Delivers reliable trip point repeatability across 10-year service life, validated per IEC 60601-1 leakage limits. |
Use Scenario: Clamping transient spikes on 28 V DC distribution lines in flight control modules. IC Role / Device Role / Timing Role: Primary shunt element in crowbar-style overvoltage protection stage. Use Value: Withstands 175°C operating temperature and meets DO-160 Section 22 surge immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4734A | 6.8 V ±5%, 1 W rating, DO-41 package, 7 Ω Zener impedance at 43 mA | Higher power dissipation allows greater current margin but requires larger PCB footprint | Select 1N4734A when thermal budget exceeds 0.5 W or lead spacing > 0.375" is available |
| BZX55C6V8 | 6.8 V ±5%, 500 mW, DO-35, 10 Ω Zener impedance at 5 mA, RoHS-only | Higher dynamic impedance reduces regulation precision under load transients | Choose BZX55C6V8 only if legacy Microsemi supply chain constraints require second-source qualification |
Compared with 1N5235B/TR, 1N4734A offers higher power headroom at the cost of larger size and different thermal profile, while BZX55C6V8 trades tighter process control for broader commercial availability but sacrifices low-current regulation fidelity.
Availability
1N5235B/TR is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, automotive ECU reference voltage generation, and medical instrument power supervision requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N5235B/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, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.
The 1N52xxB series was designed specifically for precision voltage reference and overvoltage protection in harsh-environment electronics where long-term stability, wide temperature operation, and intrinsic radiation tolerance are mandatory.
FAQ
What is the Zener voltage tolerance and test condition for 1N5235B/TR?
The 1N5235B/TR has a nominal Zener voltage of 6.8 V with ±5% tolerance, verified at a test current IZT of 20 mA and ambient temperature of 25°C. This tolerance is guaranteed per JEDEC specification for suffix "B" devices and applies across the full operating temperature range of -65°C to +175°C.
Does 1N5235B/TR support RoHS compliance?
Yes, the 1N5235B/TR is RoHS compliant when ordered with the "e3" suffix (e.g., 1N5235B-e3/TR). The base part uses tin-lead plating, but RoHS-compliant matte-tin plating is available and qualified per MIL-STD-750 Method 2026 for solderability and reliability.
What is the maximum reverse leakage current for 1N5235B/TR at 5.5 V?
The maximum reverse leakage current for 1N5235B/TR is 30 μA when measured at VR = 5.5 V, which is 81% of its nominal Zener voltage. This value is specified in the Electrical Characteristics table and reflects worst-case leakage under regulation conditions near knee voltage.
Can 1N5235B/TR be used in high-temperature environments like engine control units?
Yes, the 1N5235B/TR is rated for continuous operation from -65°C to +175°C and is widely deployed in automotive engine control units. Its hermetic DO-35 glass package and radiation-hardened construction ensure stable Zener voltage and low parameter drift under sustained thermal stress.
What does the "TR" suffix indicate in 1N5235B/TR?
The "TR" suffix in 1N5235B/TR denotes tape-and-reel packaging per EIA-296 standard, enabling automated placement using axial-lead feeders. This format supports high-volume manufacturing while preserving the device's full electrical and thermal specifications as defined for the bare component.
1N5235B/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):
- 6.8 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 5 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 5 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N5235B/TR FAQ
1.How can I place an order for 1N5235B/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5235B/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 1N5235B/TR reliable?
The price and inventory of 1N5235B/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5235B/TR is usually 5 days.
3.What payment methods are accepted for 1N5235B/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5235B/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5235B/TR?
1N5235B/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5235B/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 1N5235B/TR?
For technical support, including 1N5235B/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5235B/TR requirements.
6.How does Aetrix verify that 1N5235B/TR is sourced from the original manufacturer or authorized distributors?
All 1N5235B/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 1N5235B/TR meets industry standards.
7.What is the process for return or replacement of 1N5235B/TR?
All 1N5235B/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5235B/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 1N5235B/TR part is unused and in its original packaging.
Return procedure for 1N5235B/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5235B/TR Tags
-
MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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