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Microchip Technology 1N2996RB
- Part No.:
- 1N2996RB
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-203AA, DO-4, Stud
- Datasheet:
-
1N2996RB.pdf
- Description:
- DIODE ZENER 50V 10W DO4
- Quantity:
- Payment:
- Shipping:
Inventory:7,856
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Product details
Overview
1N2996RB from Microsemi is a 50 V, 10 W hermetically sealed Zener diode in DO-213AA (DO-4) metal-glass stud package with reverse polarity (cathode-to-stud), qualified to MIL-PRF-19500/124 JANTXV level, and rated for junction temperatures from –65 °C to +175 °C. It delivers precise voltage regulation in high-reliability power conditioning and reference circuits for aerospace and defense systems.
For engineers reviewing the 1N2996RB datasheet, 1N2996RB pinout, 1N2996RB application, or 1N2996RB equivalent, key selection criteria include its ±5% Zener tolerance, 185 Ω dynamic impedance at 15 mA test current, 400 mA maximum Zener current at 25 °C, +0.090 %/°C temperature coefficient, and thermal resistance of 12 °C/W - all critical for stable regulation under wide-temperature, high-power conditions.
Technical Context
This device operates as a precision voltage reference in series-shunt regulation topologies, where its low dynamic impedance (185 Ω at IZT = 15 mA) ensures minimal output variation across load and line changes. Its hermetically sealed DO-4 package enables direct stud-mounting to heatsinks, supporting continuous 10 W dissipation at TC = +55 °C with linear derating above that temperature.
The 1N2996RB exhibits a positive temperature coefficient of +0.090 %/°C, indicating increasing Zener voltage with rising junction temperature - a key factor when designing temperature-compensated references or parallel Zener arrays. Its reverse polarity configuration (cathode connected to the threaded stud) mandates correct mechanical orientation during mounting to avoid circuit shorts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 50 V ±5% at IZT = 15 mA - defines nominal regulation point with tight tolerance suitable for military-grade references. |
| Power Dissipation (PD) | 10 W @ TC = +55 °C - supports high-energy transient clamping and stable DC reference generation without external heatsink oversizing. |
| Dynamic Impedance (ZZT) | 185 Ω @ IZT = 15 mA - low AC impedance ensures minimal ripple rejection degradation in feedback paths. |
| Max Zener Current (IZM) | 500 mA @ 25 °C - sets absolute upper limit for safe DC biasing in shunt regulator designs. |
| Temp. Coefficient (αVZ) | +0.090 %/°C - quantifies voltage drift per degree; essential for predicting regulation shift over operating temperature range. |
| Junction Temp. Range | –65 °C to +175 °C - enables deployment in extreme environments including engine bays, space payloads, and downhole tools. |
| Thermal Resistance (RθJC) | 12 °C/W - directly determines temperature rise above case for given power; critical for thermal design margining. |
Pinout & Package
Package: DO-213AA (DO-4), hermetically sealed metal-glass stud package with 10-32 UNF–2A threaded stud (anode/cathode assignment defined by polarity suffix). Weight ≈ 7.5 g. Mounting requires torque-limited nut (max 15 in·lb).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Stud (Threaded Body) | Cathode | Primary heat path and electrical connection point; must be electrically isolated from chassis unless circuit topology requires common-cathode grounding. |
| Lead Wire | Anode | Flexible termination for PCB or wiring harness connection; polarity confirmed by "RB" suffix (reverse: cathode-to-stud). |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic metal-glass seal | Prevents moisture ingress and long-term parameter drift - required for 20+ year field life in sealed avionics enclosures. |
| JANTXV qualification | Meets MIL-PRF-19500/124 screening for radiation hardness, thermal shock, and burn-in - validated for flight-critical subsystems. |
| Reverse polarity (RB) | Cathode-to-stud configuration simplifies grounding in high-side shunt regulators and eliminates need for insulating washers in grounded-chassis designs. |
| Nonsensitive to ESD | Complies with MIL-STD-750 Method 1020 - withstands human-body-model discharges without parameter shift or failure. |
| Internal solder bond construction | Eliminates wirebond fatigue failure modes - improves reliability under high-vibration and thermal-cycling stress. |
Applications
| Aerospace Power Bus Regulation | Defense System Reference Voltage |
|---|---|
Use Scenario: Stabilizing 28 VDC aircraft bus against load transients and generator ripple in flight control computers. IC Role / Device Role / Timing Role: Shunt Zener reference in discrete voltage-clamp stage preceding LDO input. Use Value: 10 W rating absorbs sustained overvoltage events; +0.090 %/°C TC allows predictable drift compensation in closed-loop calibration routines. |
Use Scenario: Providing stable 50 V reference for analog-to-digital converter front-end in radar signal processors. IC Role / Device Role / Timing Role: Precision voltage reference source for gain-setting DACs and comparator thresholds. Use Value: ±5% tolerance and 185 Ω ZZT ensure <±0.5% reference accuracy across –55 °C to +125 °C operational range. |
| Downhole Oilfield Instrumentation | Radiation-Hardened Satellite Payloads |
Use Scenario: Regulating bias voltage for MEMS pressure sensors exposed to >150 °C wellbore temperatures. IC Role / Device Role / Timing Role: High-temperature Zener clamp protecting sensor excitation circuitry from supply surges. Use Value: Junction rating up to +175 °C and 12 °C/W RθJC enable direct stud-mounting to stainless-steel probe housings without thermal interface degradation. |
Use Scenario: Generating stable reference for telemetry voltage monitors aboard geosynchronous satellites. IC Role / Device Role / Timing Role: Radiation-tolerant voltage reference in power management IC supervision circuitry. Use Value: Inherent radiation hardness per MicroNote 050 eliminates need for shielding or redundancy - reducing SWaP-C in payload modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N2996B | Same 50 V, 10 W rating but standard polarity (anode-to-stud); no "RB" suffix. | Requires insulating hardware when stud is chassis-grounded; unsuitable for cathode-grounded topologies. | Select 1N2996B only if anode-to-stud polarity aligns with existing mechanical layout and grounding scheme. |
| 1N5375B | 50 V, 5 W plastic DO-41 package; ±5% tolerance; not MIL-qualified; RθJC ≈ 30 °C/W. | Limited to commercial-grade, lower-power, non-radiation-hardened applications; cannot replace 1N2996RB in JANTXV systems. | Use 1N5375B only for cost-sensitive, non-military prototypes where 10 W dissipation and hermeticity are unnecessary. |
Compared with 1N2996B and 1N5375B, the 1N2996RB uniquely combines reverse polarity, JANTXV qualification, and 10 W hermetic packaging - making it irreplaceable in cathode-grounded, high-reliability, high-power regulation where MIL-spec compliance is mandatory.
Availability
1N2996RB is available at Aetrix Electronics and suitable for aerospace power conditioning, defense system voltage referencing, and downhole instrumentation requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N2996RB 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 Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and aerospace-grade analog and discrete components.
The 1N2996RB belongs to Microsemi's legacy MIL-PRF-19500/124 qualified Zener diode family, engineered specifically for voltage regulation in mission-critical defense, space, and industrial systems demanding hermetic sealing and extended temperature operation.
FAQ
What is the Zener voltage tolerance of the 1N2996RB?
The 1N2996RB has a nominal Zener voltage of 50 V with a guaranteed tolerance of ±5% at IZT = 15 mA, as specified in the Electrical Characteristics table on page 4 of T4-LDS-0075 Rev. 3. This tolerance is standard across the 1N2970B–1N3015B series and applies to all qualification levels (JAN/JANTX/JANTXV).
Does the 1N2996RB require external heatsinking?
The 1N2996RB is designed for direct stud-mounting to a thermally conductive surface - its DO-4 package serves as both terminal and heatsink interface. At TC = +55 °C, it dissipates full 10 W without additional heatsinking; above that, derating is required at 0.083 W/°C. No external heatsink is needed if the mounting surface maintains ≤+55 °C case temperature.
How is polarity indicated in the 1N2996RB part number?
The "RB" suffix in 1N2996RB explicitly denotes reverse polarity: cathode is connected to the threaded stud, and anode is the lead wire. This differs from the standard 1N2996B (no suffix), where anode connects to the stud. Polarity is mechanically fixed and cannot be altered post-manufacture.
Is the 1N2996RB RoHS compliant?
No - the 1N2996RB is not RoHS compliant. Per the nomenclature guide on page 2 of T4-LDS-0075, RoHS-compliant versions require the "e3" suffix (e.g., 1N2996RBe3), which is only available for commercial-grade devices. The 1N2996RB carries no "e3" suffix and uses traditional tin-lead plating per MIL-PRF-19500/124 requirements.
What is the maximum reverse leakage current for the 1N2996RB?
The 1N2996RB exhibits a maximum reverse leakage current (IR) of 10 µA at VR = 36.0 V, as listed in the Electrical Characteristics table on page 4. This value is measured at 25 °C and reflects the device's ability to block current below its Zener knee, critical for low-power standby regulation.
1N2996RB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-203AA, DO-4, Stud
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 50 V
- Tolerance:
- ±5%
- Power - Max:
- 10 W
- Impedance (Max) (Zzt):
- 15 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 36 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 2 A
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Stud Mount
- Supplier Device Package:
- DO-4 (DO-203AA)
1N2996RB FAQ
1.How can I place an order for 1N2996RB through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N2996RB 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 1N2996RB reliable?
The price and inventory of 1N2996RB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N2996RB is usually 5 days.
3.What payment methods are accepted for 1N2996RB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N2996RB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N2996RB?
1N2996RB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N2996RB 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 1N2996RB?
For technical support, including 1N2996RB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N2996RB requirements.
6.How does Aetrix verify that 1N2996RB is sourced from the original manufacturer or authorized distributors?
All 1N2996RB 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 1N2996RB meets industry standards.
7.What is the process for return or replacement of 1N2996RB?
All 1N2996RB units undergo pre-shipment inspection (PSI). If there is an issue with 1N2996RB, 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 1N2996RB part is unused and in its original packaging.
Return procedure for 1N2996RB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N2996RB Tags
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