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Diodes Incorporated 1N5246B-T
- Part No.:
- 1N5246B-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5246B-T.pdf
- Description:
- DIODE ZENER 16V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:8,301
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Product details
Overview
1N5246B-T from Diodes Incorporated is a 16 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 17 Ω zener impedance at 7.8 mA test current and +0.083 %/°C temperature coefficient - used for precision voltage reference and overvoltage protection in low-power analog circuits.
For engineers reviewing the 1N5246B-T datasheet, 1N5246B-T pinout, 1N5246B-T application, or 1N5246B-T equivalent, this part serves as a discrete voltage regulation element requiring verification of thermal derating above 75 °C, cathode-band polarity alignment, and compatibility with lead-free reflow profiles per J-STD-020 Level 1.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load and temperature conditions. Its 16 V nominal zener voltage is specified at 7.8 mA test current, with 17 Ω dynamic impedance ensuring minimal voltage deviation during small-signal regulation.
The device features a negative-to-positive temperature coefficient (+0.083 %/°C), indicating increasing zener voltage with rising junction temperature - a key factor when designing temperature-compensated references or clamping circuits operating across industrial temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 16 V nominal, 15.2–16.8 V range at 7.8 mA - defines clamping/reference level accuracy |
| Power Dissipation (PD) | 500 mW maximum - limits continuous current to ~31.25 mA at 16 V without heatsinking |
| Zener Impedance (ZZT) | 17 Ω at IZT = 7.8 mA - determines AC ripple rejection and regulation stiffness |
| Reverse Leakage (IR) | ≤0.1 µA at VR = 12 V - ensures negligible standby current in high-impedance bias networks |
| Temperature Coefficient | +0.083 %/°C - quantifies voltage drift per degree rise; critical for temp-stable references |
| Thermal Resistance (RθJA) | 300 °C/W - requires lead length ≤9.5 mm and TL ≤75 °C for full power rating |
Pinout & Package
Package: DO-35 glass axial package with cathode band marking; hermetic, lead-free (Sn96.5Ag3.5) finish; 0.13 g mass; moisture sensitivity Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reverse breakdown reference ground | Connected to circuit ground or lower-potential node in shunt regulator configuration |
| Cathode | Reverse breakdown terminal / Zener voltage output | Marked with band; connects to regulated voltage node or input side of series resistor |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass package | Ensures long-term parameter stability and reliability in humid or corrosive environments |
| ±5% zener voltage tolerance | Enables use in cost-sensitive applications where tight regulation is not required |
| Lead-free, RoHS-compliant finish | Meets EU Directive 2015/863/EU; compatible with standard Pb-free reflow profiles |
| High-temperature operation | Rated from –65 °C to +175 °C - suitable for under-hood automotive and industrial control modules |
Applications
| Low-Power Voltage Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable bias voltage for op-amp comparators or ADC reference dividers in battery-powered sensors. IC Role / Device Role / Timing Role: Shunt voltage reference element establishing fixed 16 V reference point. Use Value: Delivers <31 mV total variation across 15.2–16.8 V tolerance and +0.083 %/°C drift, enabling sub-1% error over 0–70 °C ambient. |
Use Scenario: Protecting microcontroller I/O pins from transient surges on 12 V supply rails in industrial PLC inputs. IC Role / Device Role / Timing Role: Reverse-biased clamping diode limiting voltage to ≤16.8 V during ESD or inductive kick events. Use Value: Absorbs up to 500 mW surge energy while holding clamped voltage within 0.1 µA leakage at 12 V, minimizing false triggering. |
| Current Source Biasing | Temperature-Compensated Reference |
Use Scenario: Generating constant current for LED biasing or sensor excitation in analog front-ends. IC Role / Device Role / Timing Role: Zener-based two-terminal current source with series resistor. Use Value: Maintains ±1.5% current stability over 25–85 °C using 17 Ω ZZT and known RS, reducing need for active regulation. |
Use Scenario: Paired with complementary-tempco components (e.g., forward-biased diodes) to build zero-drift voltage references. IC Role / Device Role / Timing Role: Positive-tempco Zener element balancing negative-tempco semiconductor junctions. Use Value: +0.083 %/°C coefficient enables precise cancellation against –2.1 mV/°C silicon diode VF drift in compensated designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5246B | Surface-mount SOD-123 package; same 16 V, ±5%, 500 mW rating; 17 Ω ZZT; RoHS-compliant | Smaller footprint (2.7 × 1.6 mm vs. DO-35's 4.0 × 1.8 mm); higher board density; no axial leads | Select for automated SMT assembly and space-constrained PCBs; verify thermal pad layout for 500 mW dissipation |
| 1N4744A | DO-41 package; 15 V nominal, ±5%; 1 W power rating; 16 Ω ZZT at 17 mA; higher PD and different VZ | Higher power handling and slightly lower voltage; less sensitive to thermal derating due to larger case | Choose when 1 W dissipation or tighter 15 V reference is needed; avoid if strict 16 V requirement or DO-35 form factor is mandatory |
Compared with MMSZ5246B and 1N4744A, the 1N5246B-T offers legacy DO-35 compatibility and hermetic reliability but lacks SMT scalability or higher power headroom - making it optimal for through-hole prototyping, repair, or niche high-reliability analog subsystems.
Availability
1N5246B-T is available at Aetrix Electronics and suitable for low-power voltage reference, overvoltage clamp, and current-source biasing applications requiring stable component supply despite its obsolete status - supported via legacy inventory and cross-reference guidance.
Supply support for 1N5246B-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 and manufacturing operations across Asia and the Americas.
The 1N52xxB series belongs to Diodes' legacy Zener diode product line, designed specifically for general-purpose voltage regulation and protection in cost-sensitive, low-power analog systems - emphasizing reliability, consistency, and broad voltage coverage.
FAQ
Is the 1N5246B-T still in production?
No - Diodes Incorporated has discontinued the 1N5246B-T and marked it obsolete. It is no longer manufactured, but limited legacy stock remains available through authorized distributors and Aetrix Electronics' inventory. Customers are advised to migrate to the MMSZ5246B for new designs.
What is the maximum allowable junction temperature?
The absolute maximum junction temperature is +175 °C, consistent with the device's operating temperature range. However, sustained operation above 75 °C at the leads requires thermal derating per Note 5: power must be reduced linearly beyond that point based on RθJA = 300 °C/W and lead length constraints.
How does the +0.083 %/°C temperature coefficient affect circuit performance?
This coefficient means the zener voltage increases by approximately 13.3 mV per 10 °C rise at 16 V. In unbuffered references, this causes measurable drift - e.g., +40 mV over a 30 °C ambient shift - necessitating compensation or selection of lower-tempco alternatives like the 1N5230B (+0.030 %/°C) for tighter stability.
Can the 1N5246B-T be used in place of the 1N5246B without modification?
Yes - the "-T" suffix denotes tape-and-reel packaging (10,000 units per reel) and does not alter electrical or mechanical specifications. The 1N5246B-T shares identical Zener voltage, impedance, thermal ratings, and DO-35 package dimensions with the bulk 1N5246B, making it a direct form-fit-function replacement in automated assembly.
1N5246B-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):
- 16 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 17 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 12 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 200°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
1N5246B-T FAQ
1.How can I place an order for 1N5246B-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5246B-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 1N5246B-T reliable?
The price and inventory of 1N5246B-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5246B-T is usually 5 days.
3.What payment methods are accepted for 1N5246B-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5246B-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5246B-T?
1N5246B-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5246B-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 1N5246B-T?
For technical support, including 1N5246B-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5246B-T requirements.
6.How does Aetrix verify that 1N5246B-T is sourced from the original manufacturer or authorized distributors?
All 1N5246B-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 1N5246B-T meets industry standards.
7.What is the process for return or replacement of 1N5246B-T?
All 1N5246B-T units undergo pre-shipment inspection (PSI). If there is an issue with 1N5246B-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 1N5246B-T part is unused and in its original packaging.
Return procedure for 1N5246B-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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