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Diodes Incorporated 1N5254B-T
- Part No.:
- 1N5254B-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5254B-T.pdf
- Description:
- DIODE ZENER 27V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:11,966
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Product details
Overview
1N5254B-T from Diodes Incorporated is a 27 V, ±5% tolerance, 500 mW surface-mount Zener diode in a hermetic DO-35 glass package, rated for operation from –65°C to +175°C, with 41 Ω dynamic impedance at 4.6 mA test current and +0.090 %/°C temperature coefficient - used for precision voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the 1N5254B-T datasheet, 1N5254B-T pinout, 1N5254B-T application, or 1N5254B-T equivalent, key selection criteria include Zener voltage stability under thermal drift, low reverse leakage (≤0.1 µA at 21 V), junction-to-ambient thermal resistance (300 °C/W), and RoHS-compliant Sn96.5Ag3.5 terminations suitable for reflow-soldered industrial control modules.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable voltage regulation across varying load and temperature conditions. Its epitaxial construction ensures high stability and low noise, while the hermetic glass DO-35 package provides moisture resistance and long-term parameter retention.
It delivers 27 V nominal regulation with ±5% tolerance, 41 Ω Zener impedance at IZT = 4.6 mA, and a positive temperature coefficient of +0.090 %/°C - enabling predictable voltage drift compensation in analog sensing and reference circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 27 V nominal, 25.65–28.35 V range - defines regulated output voltage in shunt regulator topologies |
| Power Dissipation (PD) | 500 mW - sets maximum continuous power handling without derating at TL ≤75°C |
| Zener Impedance (ZZT) | 41 Ω at 4.6 mA - determines regulation accuracy under dynamic load changes |
| Reverse Leakage (IR) | ≤0.1 µA at 21 V - ensures minimal quiescent current in standby-mode voltage references |
| Temperature Coefficient | +0.090 %/°C - quantifies voltage drift per degree Celsius for thermal design margining |
| Operating Temperature | –65°C to +175°C - supports deployment in automotive engine control and industrial motor drives |
Pinout & Package
Package: Hermetic DO-35 glass case with axial leads; cathode identified by band; weight ≈ 0.13 g; moisture sensitivity Level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node in shunt regulation |
| Cathode | Reverse-biased Zener terminal / regulated voltage output | Connected to input rail; clamps voltage to 27 V when reverse current exceeds threshold |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass package | Ensures long-term parameter stability and immunity to humidity-induced degradation |
| ±5% Zener voltage tolerance | Enables tight regulation without post-production trimming in cost-sensitive consumer power supplies |
| Lead-free Sn96.5Ag3.5 finish | Complies with RoHS 3 (2015/863/EU) and supports Pb-free reflow soldering profiles |
| Low thermal resistance (300 °C/W) | Allows direct PCB mounting without heatsinking for <500 mW dissipation in ambient air |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters using TL431-based feedback networks. IC Role / Device Role / Timing Role: Provides stable 27 V reference for optocoupler biasing and error amplifier threshold setting. Use Value: Maintains ±1% output regulation across line/load/temperature with no external calibration required. |
Use Scenario: Protecting microcontroller I/O pins from transient surges on 24 V industrial sensor lines. IC Role / Device Role / Timing Role: Shunts excess energy above 27 V to ground before damage occurs to downstream logic. Use Value: Limits clamping voltage to ≤28.35 V with <0.1 µA leakage at operating voltage, minimizing standby power loss. |
| Temperature-Compensated Reference | Low-Power Sensor Biasing |
Use Scenario: Generating a stable bias voltage for RTD or thermistor measurement bridges in HVAC controllers. IC Role / Device Role / Timing Role: Supplies excitation voltage with known +0.090 %/°C drift to enable software-based thermal compensation. Use Value: Enables <±0.5°C measurement accuracy over –40°C to +125°C ambient without hardware trim components. |
Use Scenario: Biasing photodiode amplifiers in battery-powered smoke detectors. IC Role / Device Role / Timing Role: Delivers low-noise, low-drift 27 V supply for transimpedance amplifier gain-setting resistors. Use Value: Achieves <1 nA dark-current contribution and <10 ppm/°C gain drift over full operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5254B | Surface-mount SOD-123 package; same 27 V rating, ±5% tolerance, but lower PD = 350 mW and higher ZZT = 50 Ω | Designed for space-constrained PCBs where DO-35 axial footprint is unacceptable | Select when board area is limited and thermal load remains below 350 mW |
| 1N4750A | Through-hole DO-41 package; 27 V, ±5%, PD = 1 W, ZZT = 35 Ω, but lead-free finish not guaranteed | Supports higher-power regulation and manual prototyping with breadboard compatibility | Select when >500 mW dissipation or hand-soldering is required |
Compared with MMSZ5254B and 1N4750A, the 1N5254B-T offers superior thermal stability in hermetic packaging and exact RoHS 3 compliance, making it preferred for long-lifecycle industrial deployments where parameter drift and supply chain traceability are critical.
Availability
1N5254B-T is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface modules, and automotive body control units requiring stable component supply despite its obsolete status - supported via legacy inventory and cross-reference sourcing.
Supply support for 1N5254B-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, headquartered in Plano, Texas, with design centers across Asia and manufacturing in Taiwan and China.
The 1N52xxB series was developed for high-reliability voltage reference and protection in cost-sensitive, thermally demanding applications - emphasizing hermetic stability, tight tolerance, and extended temperature capability.
FAQ
Is the 1N5254B-T still in active production?
No - Diodes Incorporated has discontinued the 1N5254B-T and marked it obsolete per DS18006 Rev. 19. Aetrix Electronics maintains limited legacy stock and supports transition to MMSZ5254B or 1N4750A based on thermal, package, and compliance requirements.
What is the maximum reverse voltage before breakdown?
The 1N5254B-T begins regulating at its nominal Zener voltage of 27 V, with guaranteed breakdown between 25.65 V and 28.35 V at 4.6 mA test current. It is not rated for sustained operation above 28.35 V without exceeding power or thermal limits.
Can this diode be used in parallel for higher current handling?
No - Zener diodes exhibit manufacturing variance in VZ, causing current hogging and thermal runaway when paralleled. For higher current, use a single higher-power Zener (e.g., 1N4750A) or an active shunt regulator circuit.
Does the DO-35 package support automated pick-and-place assembly?
The DO-35 package is axial-leaded and not compatible with standard SMT pick-and-place equipment. It requires through-hole placement or manual insertion; for automated assembly, MMSZ5254B in SOD-123 is the recommended drop-in alternative.
1N5254B-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):
- 27 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 41 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 21 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
1N5254B-T FAQ
1.How can I place an order for 1N5254B-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5254B-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 1N5254B-T reliable?
The price and inventory of 1N5254B-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5254B-T is usually 5 days.
3.What payment methods are accepted for 1N5254B-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5254B-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5254B-T?
1N5254B-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5254B-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 1N5254B-T?
For technical support, including 1N5254B-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5254B-T requirements.
6.How does Aetrix verify that 1N5254B-T is sourced from the original manufacturer or authorized distributors?
All 1N5254B-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 1N5254B-T meets industry standards.
7.What is the process for return or replacement of 1N5254B-T?
All 1N5254B-T units undergo pre-shipment inspection (PSI). If there is an issue with 1N5254B-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 1N5254B-T part is unused and in its original packaging.
Return procedure for 1N5254B-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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