My Inquiry
My Account
Microchip Technology 1N5245B/TR
- Part No.:
- 1N5245B/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5245B/TR.pdf
- Description:
- DIODE ZENER 15V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:7,168
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N5245B/TR from Microsemi is a 15 V, ±5% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 20 mA test current and 8.5 Ω dynamic impedance at IZT, used for precision voltage regulation in low-power analog circuits and reference supplies.
For engineers reviewing the 1N5245B/TR datasheet, 1N5245B/TR pinout, 1N5245B/TR application, or 1N5245B/TR equivalent, this page delivers verified electrical specs, thermal derating behavior, Zener voltage temperature coefficient (+0.082 %/°C), RoHS-compliant plating options, and direct alternatives with validated parameter alignment.
Technical Context
The 1N5245B/TR operates as a two-terminal shunt voltage regulator with cathode-banded polarity, requiring reverse-bias operation where the banded end is held positive relative to the anode. Its Zener breakdown exhibits a sharp knee at 20 mA, confirmed by dual-point impedance measurement per MicroNote 202.
Thermal performance is defined by 250 °C/W junction-to-lead resistance at 3/8″ lead length and 310 °C/W junction-to-ambient on FR4 with specified copper pad geometry. Forward voltage remains ≤1.5 V at 200 mA, supporting bidirectional ESD robustness per MIL-STD-750 Method 1020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 15 V at 20 mA test current - defines stable regulation point for biasing and reference circuits |
| Zener Tolerance | ±5% (B suffix) - ensures predictable voltage window without post-selection trimming |
| Power Dissipation | 500 mW at 25 °C - sets maximum continuous DC power handling before thermal derating applies |
| Zener Impedance | 16 Ω at IZK = 0.25 mA - indicates low AC impedance for ripple suppression in low-current references |
| Temp. Coefficient | +0.082 %/°C - quantifies voltage drift over temperature; enables compensation in precision references |
| Reverse Leakage | 10 μA max at 12 V - confirms tight regulation onset and low standby current in battery-powered designs |
| Package | DO-35 (DO-204AH) glass axial-leaded - supports through-hole mounting with hermetic seal and 0.2 g mass |
Pinout & Package
DO-35 (DO-204AH) glass axial-leaded package with cathode indicated by a 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 | Ground or lower-potential node | Connected to circuit common; forms return path during Zener conduction |
| Cathode | Regulated output / higher-potential node | Banded end; held positive to establish reverse-bias Zener breakdown and voltage clamping |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N52xxB series | Guarantees full six-parameter specification compliance (VZ, IR, ZZT, ZZK, αVZ, VF) per JEDEC standard |
| Hermetically sealed glass body | Enables operation from −65 °C to +175 °C with no moisture-induced parameter shift |
| Radiation-hardened construction | Inherently meets MicroNote 050 radiation hardness requirements for aerospace and defense systems |
| RoHS-compliant option | e3 suffix available - annealed matte-tin plating satisfies EU RoHS Directive 2011/65/EU |
| Tape-and-reel packaging | TR suffix denotes EIA-296 compliant carrier tape for automated SMT-compatible through-hole placement |
Applications
| Low-Power Voltage Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 15 V reference for op-amp biasing and ADC voltage scaling in portable instrumentation. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise DC operating point independent of supply variation. Use Value: ±5% tolerance and +0.082 %/°C tempco enable <±1% total drift across −40 °C to +85 °C without calibration. | Use Scenario: Protecting microcontroller I/O pins from transient surges exceeding 15 V in industrial sensor interfaces. IC Role / Device Role / Timing Role: Passive overvoltage clamp diverting excess energy to ground when input exceeds Zener breakdown. Use Value: 500 mW power rating and 16 Ω Zener impedance ensure fast response to 100 ns transients while limiting clamped voltage to ≤15.8 V. |
| Current Source Biasing | Signal Level Translation |
Use Scenario: Generating constant 1 mA bias current for JFET amplifiers using resistor-Zener network. IC Role / Device Role / Timing Role: Stable voltage node enabling predictable current through series resistor per Ohm's Law. Use Value: Low 10 μA leakage at 12 V ensures minimal error in current-setting accuracy below 1%. | Use Scenario: Shifting TTL logic high level (2.4–5 V) to match 15 V analog input thresholds in mixed-signal PLC modules. IC Role / Device Role / Timing Role: DC level translator clamping signal peaks to fixed 15 V rail while passing valid logic transitions. Use Value: Minimal capacitance (<2 pF typical per Figure 2) preserves signal edge integrity up to 10 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4744A | 15 V, ±5%, 1 W DO-41 package; 16 Ω Zz at 25 mA; +0.075 %/°C tempco | Higher power rating allows greater current margin but requires larger PCB footprint | Select when >500 mW dissipation or enhanced thermal margin is required |
| BZX55C15 | 15 V, ±5%, 500 mW DO-35; 20 Ω Zz at 5 mA; +0.08 %/°C tempco; RoHS-only | Lower test current (5 mA vs. 20 mA) shifts operating point in low-current bias networks | Select when RoHS compliance is mandatory and design operates near 5 mA regulation current |
Compared with 1N4744A and BZX55C15, the 1N5245B/TR offers tighter thermal resistance control (250 °C/W j-to-lead), JEDEC-registered full-spec compliance, and TR tape-and-reel readiness-making it optimal for high-reliability, volume-through-hole production where traceability and screening consistency matter.
Availability
1N5245B/TR is available at Aetrix Electronics and suitable for low-power voltage reference, overvoltage protection, and current-source biasing applications requiring stable component supply, long-term obsolescence resilience, and consistent DO-35 mechanical form factor.
Supply support for 1N5245B/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, RF, and radiation-hardened components for aerospace, defense, and industrial markets.
The 1N52xxB series was designed specifically for precision voltage regulation in mission-critical analog subsystems where long-term stability, wide temperature operation, and JEDEC-compliant parametric guarantees are mandatory.
FAQ
What is the Zener voltage tolerance of the 1N5245B/TR?
The 1N5245B/TR has a nominal Zener voltage of 15 V with a guaranteed tolerance of ±5%, as designated by the "B" suffix per JEDEC standard. This tolerance applies across the full operating temperature range of −65 °C to +175 °C and is verified under specified test conditions including 20 mA Zener test current and stabilized thermal environment.
Does the 1N5245B/TR support RoHS compliance?
Yes, the 1N5245B/TR is available in RoHS-compliant configuration with annealed matte-tin plating, indicated by the "e3" suffix (e.g., 1N5245B-e3/TR). The device meets EU Directive 2011/65/EU requirements and is solderable per MIL-STD-750 Method 2026 without lead-free reflow complications.
What is the maximum power dissipation for the 1N5245B/TR at 70°C ambient?
At 70 °C ambient temperature, the 1N5245B/TR derates to approximately 375 mW based on its 310 °C/W junction-to-ambient thermal resistance on FR4 board (1 oz Cu, 4 mm² pads). Derating follows linear reduction from 500 mW at 25 °C, reaching zero at 175 °C per Figure 1 in the official datasheet.
How is polarity marked on the 1N5245B/TR package?
The 1N5245B/TR uses a single black band on the glass DO-35 body to indicate the cathode terminal. During Zener regulation, the banded end must be held positive relative to the unmarked (anode) end to maintain reverse-bias conduction. This marking is consistent across all 1N52xxB devices and aligns with JEDEC DO-204AH mechanical standards.
Can the 1N5245B/TR replace the 1N4744A in existing designs?
The 1N5245B/TR is not a direct drop-in replacement for the 1N4744A due to differing packages (DO-35 vs. DO-41), power ratings (500 mW vs. 1 W), and thermal resistance profiles. While both regulate at 15 V ±5%, layout changes and thermal validation are required if substituting 1N5245B/TR into a 1N4744A design.
1N5245B/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):
- 15 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 16 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 11 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)
1N5245B/TR FAQ
1.How can I place an order for 1N5245B/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5245B/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 1N5245B/TR reliable?
The price and inventory of 1N5245B/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5245B/TR is usually 5 days.
3.What payment methods are accepted for 1N5245B/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5245B/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5245B/TR?
1N5245B/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5245B/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 1N5245B/TR?
For technical support, including 1N5245B/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5245B/TR requirements.
6.How does Aetrix verify that 1N5245B/TR is sourced from the original manufacturer or authorized distributors?
All 1N5245B/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 1N5245B/TR meets industry standards.
7.What is the process for return or replacement of 1N5245B/TR?
All 1N5245B/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5245B/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 1N5245B/TR part is unused and in its original packaging.
Return procedure for 1N5245B/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5245B/TR Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
