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Vishay General Semiconductor - Diodes Division BZX85B24-TR
- Part No.:
- BZX85B24-TR
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZX85B24-TR.pdf
- Description:
- DIODE ZENER 24V 1.3W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:21,209
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Product details
Overview
BZX85B24-TR from Vishay is a silicon planar power Zener diode rated for 24 V nominal zener voltage (23.5–24.5 V), ±2 % tolerance, 1.3 W power dissipation, and DO-41 glass package - designed for precision voltage stabilization and clipping in high-reliability linear power supplies and reference circuits.
For engineers reviewing the BZX85B24-TR datasheet, BZX85B24-TR pinout, BZX85B24-TR application, or BZX85B24-TR equivalent, this device offers verified thermal resistance (130 °C/W), low dynamic impedance (<25 Ω at 10 mA), and temperature coefficient of +0.06 %/°C - critical for stable biasing in industrial sensor interfaces and analog front-ends.
Technical Context
The BZX85B24-TR operates as a two-terminal voltage reference with reverse-biased breakdown behavior, where zener conduction begins at VZ = 23.5–24.5 V under IZT = 10 mA test condition. Its junction temperature is rated to 175 °C, and thermal performance assumes leads are held at ambient temperature 10 mm from the case.
Dynamic resistance rZT remains ≤25 Ω at IZT = 10 mA and ≤600 Ω at IZK = 0.5 mA, enabling stable regulation across moderate current variations. Reverse leakage is limited to <0.5 µA at VR = 18 V, supporting low-power standby operation in battery-backed systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 23.5–24.5 V at IZT = 10 mA - defines precise regulation point for 24 V rail stabilization |
| Power Dissipation (Ptot) | 1.3 W at Tamb = 25 °C - supports continuous operation in compact PCB layouts without forced cooling |
| Dynamic Resistance (rZT) | <25 Ω at IZT = 10 mA - ensures minimal output voltage shift under load transients |
| Temperature Coefficient (αVZ) | +0.06 %/°C at IZ = IZT - enables predictable drift compensation in wide-temperature industrial environments |
| Reverse Leakage Current | <0.5 µA at VR = 18 V - maintains low quiescent current in always-on monitoring circuits |
| Thermal Resistance (RthJA) | 130 °C/W - determines maximum allowable ambient temperature for safe 1.3 W operation |
| Junction Temperature (Tj) | 175 °C - sets upper thermal limit for reliability in sealed enclosures or high-ambient applications |
Pinout & Package
DO-41 glass axial package: hermetically sealed cylindrical body with cathode band marking; lead diameter 0.51 mm (0.020"), overall length 4.1 mm (0.16"), weight ≈310 mg.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / reference ground node | Connected to circuit common; establishes reference potential for zener biasing |
| Cathode | Reverse breakdown terminal / regulated output node | Marked with band; delivers stabilized 24 V when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables tighter regulation than E24-grade C-series parts - reduces need for post-calibration trimming |
| 1.3 W power rating | Supports higher current drive (up to 47 mA) without derating in standard ambient conditions |
| Low rZT <25 Ω | Minimizes output impedance variation across operating current range - improves line regulation |
| +0.06 %/°C tempco | Provides predictable positive drift - simplifies temperature-compensated reference design |
| DO-41 glass package | Offers superior moisture resistance and long-term parameter stability vs. plastic-packaged alternatives |
Applications
| Industrial Power Supply Reference | Overvoltage Protection Clamp |
|---|---|
|
Use Scenario: Stabilizing feedback voltage in isolated 24 V DC-DC converter secondary-side regulation loop. IC Role / Device Role / Timing Role: Zener diode provides fixed 24 V reference for optocoupler-based error amplifier input. Use Value: Tight ±2 % tolerance and low rZT ensure consistent output voltage accuracy across line/load/temperature. |
Use Scenario: Clamping transient overvoltage on 24 V CAN bus power rail during load dump events. IC Role / Device Role / Timing Role: Acts as shunt protector by conducting excess energy above 24.5 V into ground path. Use Value: 1.3 W rating and 175 °C junction rating allow sustained clamping without thermal runaway. |
| Programmable Logic Controller Input Conditioning | Analog Sensor Biasing Circuit |
|
Use Scenario: Providing stable 24 V bias to discrete transistor input stage of PLC digital input module. IC Role / Device Role / Timing Role: Zener establishes clean reference for threshold detection against noisy field wiring. Use Value: Low reverse leakage (<0.5 µA) prevents false triggering in high-impedance sensing paths. |
Use Scenario: Generating precision 24 V excitation voltage for strain gauge bridge in industrial weighing system. IC Role / Device Role / Timing Role: Functions as low-noise, thermally stable voltage source for bridge biasing. Use Value: +0.06 %/°C tempco allows predictable offset correction in firmware calibration routines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX85C24-TR | ±5 % tolerance (22.8–25.6 V), same DO-41 package and 1.3 W rating | Lower cost; acceptable where 5 % regulation tolerance suffices | Select for non-critical biasing or cost-sensitive consumer designs |
| 1N4749A-TAP | 24 V ±5 %, 1 W rating, DO-41, rZT ≤25 Ω but lower max power and higher tempco (+0.08 %/°C) | Limited to lower-current applications; less stable over temperature | Choose only if supply current ≤42 mA and ambient <70 °C |
Compared with BZX85C24-TR and 1N4749A-TAP, the BZX85B24-TR delivers tighter voltage control and higher thermal margin - making it preferred for industrial-grade 24 V reference and protection functions where long-term stability and temperature resilience are required.
Availability
BZX85B24-TR is available at Aetrix Electronics and suitable for industrial power supplies, programmable logic controller (PLC) modules, analog sensor signal conditioning, and overvoltage protection circuits requiring stable component supply and long-lifecycle support.
Supply support for BZX85B24-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
Vishay Semiconductor GmbH is a global leader in discrete semiconductors and passive components, specializing in high-reliability, high-performance devices for automotive, industrial, and computing markets.
The BZX85-Series is engineered for precision voltage regulation in demanding linear power and protection applications - emphasizing thermal robustness, tight tolerance grading, and long-term parametric stability in harsh environments.
FAQ
What is the exact zener voltage range for BZX85B24-TR?
The BZX85B24-TR has a guaranteed zener voltage range of 23.5 V to 24.5 V at IZT = 10 mA, reflecting its ±2 % tolerance grade per the E24 standard. This range is measured under pulsed conditions (tp = 5 ms) and is validated across production lots per Vishay Document Number 85607 Rev. 1.7.
Is BZX85B24-TR compatible with lead-free reflow soldering?
Yes, the BZX85B24-TR's DO-41 glass package and internal construction are qualified for lead-free reflow processes per JEDEC J-STD-020. Maximum peak temperature is 260 °C for ≤10 seconds, and the device meets Vishay's RoHS-compliant material declaration per their Ozone Depleting Substances Policy Statement.
What is the maximum continuous zener current for BZX85B24-TR?
The admissible zener current for BZX85B24-TR is 47 mA at Tamb = 25 °C, derived from Ptot = 1.3 W and VZ ≈24 V. At elevated ambient temperatures, current must be derated per Figure 5 in the datasheet - e.g., ~32 mA at 70 °C ambient.
Does BZX85B24-TR have a specified cathode marking?
Yes, the BZX85B24-TR uses a single black cathode band located near one end of the DO-41 glass body, per standard JEDEC DO-41 polarity convention. The cathode is the terminal where the band is located; this marking is visible under standard visual inspection and automated optical recognition systems.
How does the temperature coefficient of BZX85B24-TR affect long-term stability?
The BZX85B24-TR exhibits a temperature coefficient of +0.06 %/°C at IZ = IZT, meaning its zener voltage increases by approximately 14.4 mV per °C rise. This predictable positive drift enables deterministic firmware compensation in closed-loop systems - unlike ungraded parts with variable or negative tempcos that cause unpredictable drift.
BZX85B24-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- BZX85
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 24 V
- Tolerance:
- ±2%
- Power - Max:
- 1.3 W
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 18 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -55°C ~ 175°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AL (DO-41)
BZX85B24-TR FAQ
1.How can I place an order for BZX85B24-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX85B24-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 BZX85B24-TR reliable?
The price and inventory of BZX85B24-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX85B24-TR is usually 5 days.
3.What payment methods are accepted for BZX85B24-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX85B24-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX85B24-TR?
BZX85B24-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX85B24-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 BZX85B24-TR?
For technical support, including BZX85B24-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX85B24-TR requirements.
6.How does Aetrix verify that BZX85B24-TR is sourced from the original manufacturer or authorized distributors?
All BZX85B24-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 BZX85B24-TR meets industry standards.
7.What is the process for return or replacement of BZX85B24-TR?
All BZX85B24-TR units undergo pre-shipment inspection (PSI). If there is an issue with BZX85B24-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 BZX85B24-TR part is unused and in its original packaging.
Return procedure for BZX85B24-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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