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Diodes Incorporated 1N5235B-T
- Part No.:
- 1N5235B-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5235B-T.pdf
- Description:
- DIODE ZENER 6.8V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:2,887
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Product details
Overview
1N5235B-T from Diodes Incorporated is a 6.8V ±5% tolerance, 500mW glass-encapsulated Zener diode in DO-35 package, designed for precision voltage regulation and reference applications in low-power analog circuits, power supply feedback loops, and overvoltage protection. It delivers 5.0µA maximum reverse leakage at 5.0V, 5.0Ω typical Zener impedance at 20mA test current, and +0.050%/°C temperature coefficient.
For engineers reviewing the 1N5235B-T datasheet, 1N5235B-T pinout, 1N5235B-T application, or 1N5235B-T equivalent, this page provides verified electrical parameters, DO-35 terminal configuration, real-world use cases in voltage reference and clamp circuits, and validated drop-in alternatives with documented Zener voltage and impedance differences.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable DC voltage under varying load and temperature conditions. Its hermetic glass DO-35 package ensures long-term stability and moisture resistance (J-STD-020 Level 1), while the Sn96.5Ag3.5 lead finish guarantees reliable solderability per MIL-STD-202 Method 208.
The device exhibits a nominal Zener voltage of 6.8V with ±5% tolerance, measured at 20mA test current, and features a positive temperature coefficient (+0.050%/°C) that enables predictable drift compensation in multi-diode reference designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.8V nominal, 6.46–7.14V range at 20mA - defines precise clamping/reference level in feedback networks |
| Power Dissipation (PD) | 500mW - supports continuous operation in low-power regulators without heatsinking |
| Zener Impedance (ZZT) | 5.0Ω max at 20mA - ensures minimal output voltage variation under dynamic load changes |
| Reverse Leakage (IR) | 3.0µA max at 5.0V - reduces quiescent current error in high-impedance reference nodes |
| Temp. Coefficient (TC) | +0.050%/°C - enables predictable voltage drift compensation across -65°C to +175°C operating range |
| Package | DO-35 glass axial - provides hermetic sealing and mechanical robustness for industrial environments |
Pinout & Package
DO-35 glass axial package with cathode band marking; two-terminal device with no internal leads beyond anode and cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference ground node | Connected to circuit ground or lower-potential rail in shunt regulator configurations |
| Cathode | Reverse-biased Zener terminal / regulated output node | Connected to input voltage source via series resistor; supplies stable 6.8V reference to load |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass encapsulation | Prevents moisture ingress and parameter drift over time in humid or high-reliability environments |
| ±5% Zener voltage tolerance | Enables direct use in cost-sensitive applications without post-manufacture trimming |
| Lead-free Sn96.5Ag3.5 finish | Ensures RoHS compliance and compatibility with standard reflow and hand-soldering processes |
| Low thermal resistance (300°C/W) | Allows full 500mW dissipation with minimal junction-to-ambient rise when leads are held ≤75°C |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp Protection |
|---|---|
|
Use Scenario: Regulating output voltage in linear or switching power supplies using TL431-compatible feedback topology. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 6.8V threshold to optocoupler input or error amplifier. Use Value: Maintains ±1% output accuracy over line/load/temperature with <5Ω dynamic impedance. |
Use Scenario: Protecting microcontroller I/O pins from transient overvoltage events on sensor interfaces. IC Role / Device Role / Timing Role: Passive clamp limiting voltage to 6.8V during ESD or surge events. Use Value: Absorbs up to 500mW peak energy without degradation, with <3µA leakage preserving signal integrity. |
| Low-Power Analog Reference | Temperature-Compensated Bias Generator |
|
Use Scenario: Providing stable bias voltage for op-amp input stages in battery-powered instrumentation. IC Role / Device Role / Timing Role: Precision DC reference source for offset calibration and gain-setting networks. Use Value: Delivers 6.8V ±5% with +0.05%/°C drift, enabling <0.5% total error over -40°C to +85°C. |
Use Scenario: Generating temperature-stable bias currents in analog front-end amplifiers. IC Role / Device Role / Timing Role: Paired with complementary diode to cancel thermal drift in current mirror references. Use Value: Positive TC enables predictable cancellation when combined with negative-TC components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5235B | SOT-23 surface-mount package; same 6.8V ±5%, 500mW rating; 7Ω max ZZT vs. 5Ω | Requires PCB redesign for SMT assembly; higher Zener impedance affects regulation tightness | Preferred for automated high-volume production where board space and assembly efficiency are critical |
| 1N4734A | DO-41 package; 6.8V ±5%; 1W power rating; 5Ω max ZZT; -65°C to +175°C range | Larger footprint and higher power handling; identical voltage spec but different thermal profile | Selected when >500mW transient dissipation or legacy through-hole compatibility is required |
Compared with 1N5235B-T, MMSZ5235B offers SMT compatibility at the cost of slightly higher impedance, while 1N4734A provides higher power margin and same voltage accuracy in a larger axial package-both retain the +0.05%/°C TC for consistent thermal behavior.
Availability
1N5235B-T is available at Aetrix Electronics and suitable for voltage reference design, overvoltage protection, and low-power analog biasing requiring stable component supply across industrial control, sensor interface, and embedded power management applications.
Supply support for 1N5235B-T 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, industry-standard components for power management, signal integrity, and protection.
The 1N52xxB series belongs to Diodes' legacy Zener diode product line, engineered specifically for cost-effective, stable voltage reference and clamping in general-purpose analog and power circuits.
FAQ
What is the maximum reverse voltage before breakdown for 1N5235B-T?
The 1N5235B-T is rated for a nominal Zener voltage of 6.8V at 20mA test current, with guaranteed breakdown occurring between 6.46V and 7.14V. It does not specify a distinct "reverse breakdown threshold" separate from its Zener voltage specification; operation below 6.46V results in sub-microamp reverse leakage only.
Can 1N5235B-T be used in place of 1N4734A?
No - while both are 6.8V Zeners, 1N5235B-T is rated for 500mW and uses DO-35 glass packaging, whereas 1N4734A is rated for 1W and uses DO-41. Substituting without derating risks thermal failure under identical power conditions; physical dimensions and thermal resistance also differ significantly.
Is there a SPICE model available for 1N5235B-T?
Yes - Diodes Incorporated provides generic SPICE models for the 1N52xxB family, referenced as "spice model number 1" and "spice model number 2" in the datasheet. These models include parameters for Zener voltage, dynamic impedance, and temperature coefficient, and are validated for DC and small-signal AC simulation.
Why is 1N5235B-T marked as obsolete?
Diodes Incorporated has discontinued the 1N52xxB series in favor of the MMSZ52xxB SOT-23 family, which offers identical electrical specs in a smaller, surface-mount package. The 1N5235B-T remains available through authorized distributors for legacy repair and low-volume production, with full parametric documentation retained.
1N5235B-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
1N5235B-T FAQ
1.How can I place an order for 1N5235B-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5235B-T 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-T reliable?
The price and inventory of 1N5235B-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5235B-T is usually 5 days.
3.What payment methods are accepted for 1N5235B-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5235B-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5235B-T?
1N5235B-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5235B-T 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-T?
For technical support, including 1N5235B-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5235B-T requirements.
6.How does Aetrix verify that 1N5235B-T is sourced from the original manufacturer or authorized distributors?
All 1N5235B-T 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-T meets industry standards.
7.What is the process for return or replacement of 1N5235B-T?
All 1N5235B-T units undergo pre-shipment inspection (PSI). If there is an issue with 1N5235B-T, 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-T part is unused and in its original packaging.
Return procedure for 1N5235B-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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