SS14MH Equivalent & Substitute Parts

Part Overview

The SS14MH is a Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, designed for surface mount applications in the Micro SMA package. This component operates at 40 V reverse voltage with 1 A average rectified current and is qualified to AEC-Q101 automotive standards. The part is currently in active production status.

Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing, inventory constraints occur, or when transitioning from legacy components to current production lines. The SS14MH maintains specific electrical and mechanical characteristics that define its substitution group.

Substiute Parts

SS14MH

Taiwan Semiconductor CorporationIn Stock: 4494SS14MH Datasheet

Current PartRFQ

SS14M RSG

Taiwan Semiconductor CorporationIn Stock: 2438SS14M RSG Datasheet

Parametric EquivalentRFQ

NRVBSS14HE

onsemiIn Stock: 5466NRVBSS14HE Datasheet

Parametric EquivalentRFQ

SS14HE

onsemiIn Stock: 23198SS14HE Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SS14MH is determined by matching the following critical electrical and mechanical parameters:

Electrical Matching Criteria:

• Voltage - DC Reverse (Vr) (Max): 40 V
• Current - Average Rectified (Io): 1 A
• Voltage - Forward (Vf) (Max) @ If: 550 mV @ 1 A
• Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
• Current - Reverse Leakage @ Vr: 50 µA @ 40 V
• Operating Temperature - Junction: -55°C to 150°C

Mechanical Matching Criteria:

• Mounting Type: Surface Mount
• Package / Case: 2-SMD, Flat Lead
• Technology: Schottky

Compliance Matching Criteria:

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

Parts identified as substitutes maintain these core parameters. Variations in supplier device package designation (Micro SMA versus SOD-323HE) and minor capacitance differences (50 pF versus 55 pF) do not disqualify substitution when all primary electrical and mechanical parameters align.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: SS14MH

The SS14MH is the recommended primary component for new designs. It maintains active production status, carries AEC-Q101 automotive qualification, and is ROHS3 compliant. Current inventory of 4,399 pieces supports production requirements.

Secondary Selection: SS14M RSG

The SS14M RSG is a parametric equivalent manufactured by Taiwan Semiconductor Corporation with identical electrical specifications and Micro SMA packaging. This part is also in active production status and carries ROHS3 compliance. With 2,370 pieces in inventory, it serves as a direct functional substitute when SS14MH availability is constrained. No design modifications are required for substitution.

Legacy Alternatives: NRVBSS14HE and SS14HE

Both NRVBSS14HE (onsemi) and SS14HE (onsemi) are marked as "Not For New Designs" and represent legacy product lines. These parts maintain electrical equivalence to the SS14MH with identical voltage, current, and temperature specifications. However, they employ the SOD-323HE package designation rather than Micro SMA, and capacitance is specified at 55 pF versus 50 pF. Both carry AEC-Q101 qualification (NRVBSS14HE) or lack explicit automotive grading (SS14HE) and are ROHS3 compliant.

Use of NRVBSS14HE or SS14HE is limited to legacy system maintenance or when existing PCB layouts mandate SOD-323HE package compatibility. These parts should not be selected for new design implementations.

Compliance and Certification Summary

All identified substitutes maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating. The SS14MH and SS14M RSG both carry explicit AEC-Q101 automotive qualification, making them suitable for automotive applications. NRVBSS14HE also carries AEC-Q101 qualification, while SS14HE does not specify automotive grading.

Frequently Asked Questions (FAQ)

Q: Can SS14M RSG be used as a direct replacement for SS14MH?

A: Yes. The SS14M RSG is a parametric equivalent with identical electrical specifications (40 V reverse voltage, 1 A average rectified current, 550 mV forward voltage, fast recovery speed, and 50 µA reverse leakage). Both use Micro SMA packaging and are manufactured by Taiwan Semiconductor Corporation. No circuit modifications are required.

Q: What is the difference between Micro SMA and SOD-323HE packages?

A: Micro SMA and SOD-323HE are distinct supplier device package designations for 2-SMD, flat lead surface mount diodes. While both are physically compatible with standard 0603-equivalent footprints, PCB layout and land pattern specifications may differ. Verify PCB design compatibility before substituting between these package types.

Q: Why are NRVBSS14HE and SS14HE marked as "Not For New Designs"?

A: These parts represent legacy product lines from onsemi. While they maintain electrical equivalence to the SS14MH, their discontinued status for new designs indicates manufacturer transition to newer alternatives. New designs should prioritize SS14MH or SS14M RSG for long-term supply chain stability.

Q: Are all substitute parts automotive qualified?

A: The SS14MH, SS14M RSG, and NRVBSS14HE carry AEC-Q101 automotive qualification. The SS14HE does not specify automotive grading. For automotive applications, select from SS14MH, SS14M RSG, or NRVBSS14HE.

Q: What is the significance of the 5 pF capacitance difference between parts?

A: NRVBSS14HE and SS14HE specify 55 pF capacitance at 4 V and 1 MHz, while SS14MH and SS14M RSG specify 50 pF under identical conditions. This 5 pF difference is within typical manufacturing tolerance ranges for Schottky diodes and does not disqualify substitution in standard rectification applications. Verify capacitance requirements for high-frequency or precision switching applications.

Q: What inventory levels should influence part selection?

A: Current inventory levels are: SS14MH (4,399 pieces), SS14M RSG (2,370 pieces), NRVBSS14HE (5,399 pieces), and SS14HE (23,100 pieces). For immediate production needs, SS14HE offers the highest availability. For active production designs, prioritize SS14MH or SS14M RSG based on supply chain strategy and long-term availability projections.

Q: Can these parts be used interchangeably in existing designs?

A: Yes, within the constraints of package compatibility. SS14MH and SS14M RSG are fully interchangeable. NRVBSS14HE and SS14HE require PCB footprint verification due to SOD-323HE package designation. All four parts maintain identical electrical performance in standard rectification circuits operating within specified voltage and current limits.